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How will renewable power generation be affected by climate change?
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Dear colleague,
I kindly ask for confirmation regarding the validity of your request for additional information and expectations related to your letter about my inclusion and collaboration with you on the article you are working on. I would appreciate any further details you can provide regarding my potential contributions, responsibilities, and the scope of my involvement in the project. Additionally, if there are any specific areas where my expertise could add value, please do not hesitate to share, as I am keen to better understand how I can best support your work.
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Can energy management and its conversion through electromagnetic conversion into electricity reduce and benefit from its environmental risks and impacts?
The global community has a responsibility to address the environmental concerns for energy purposes by replacing existing coal and hydrocarbon methods with sustainable and efficient energy systems. Hence, current power generation systems are constrained by physical laws that reduce performance by converting more energy into heat. Similarly, the revolution and widespread implementation of renewable energies worldwide have shown that electromagnetic transfer is a viable option for harnessing the induced mechanical energy provided by wind or water into exergy. Exergy focuses on the efficiency of the second law of thermodynamics with the aim of ensuring the availability and quality of energy in energy management systems. Therefore, it is necessary to reduce energy demand by building highly efficient electrical appliances and increasing the quality of energy with the output power generation systems. This chapter provides a single diagram for developing new models and designs for power generation with the aim of developing variable efficiency power systems. In addition, an analysis of magnetism, electromagnetic induction, and magnetic materials will be conducted for design, optimization, and implementation in current power cycles.
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It is a noble thought, and every opportunity must be explored because energy is the driving force and environmental impact is the reality of the time. Rich, poor, developed, and developing, all are in the ambit of the negative effects. If we stick to the basics, then the research suggests the best way to tackle the situation is to either manage from the supply or demand side. The demand side is more suitable because the impact is more with less effect on the economy. In all of it if we consider the negative effects on carbon space availability then the situation is far more grave which calls for survival actions for humanity on a war footing in every corner of the globe.
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A-Boiler
1-Boiler efficiency direct method
Boiler efficiency = (Mass of steam flow X Steam enthalpy-Feed water flow at economizer inlet X Enthalpy-Attemperator water flow X Enthalpy) / (GCV of fuel X Fuel consumption)
2-Boiler efficiency by indirect method
Boiler efficiency = 100-Various losses
3-Theoretical air requirement for combustion
Theoretical air Thair = ((11.6 X C% + (34.8 X (H2-O2/8)) + (4.35 X %S))/100
Where C = % of carbon in fuel
H2 = % of Hydrogen present in fuel
S = % of sulphur present in fuel
4-Excess air requirement for combustion
%EA = O2% / (21-O2%)
Where O2 = % of oxygen present in flue gas
5-Mass of actual air supplied
AAS = (1 + EA / 100) X Theoretical air
6-Mass of flue gas
Mfg = Mass of Air + 1
6-Mass of dry flue gas
Mfg = Mass of Co2 in flue gas + Mass of Nitrogen in fuel + Mass of Nitrogen in combustion air + Mass of oxygen in flue gas + Mass of So2 in flue gas
Mfg =(Carbon % in fuel X Molecular weight of CO2 / Mol.weight of Carbon) + N2 in fuel + (Mass of actual air supplied X % of N2 in air i.e 77/100) + ((Mass of actual air – Mass of theoretical air) X 23/100) + S2 in fuel X Mol.weight of SO2 / Mol.weight of sulphur)
7-% of heat loss in dry flue gas
Heat loss = Mfg X Cp X (Tf-Ta) X 100 / GCV of fuel
Where,
Mfg = Mass of flue gas
Cp = Specific heat of flue gas in kacl/kg
Tf = Temperature of flue gas
Ta = Ambient air temperature
9-% of heat loss due to moisture in fuel
Heat loss = M X (584 + Cp X (Tf-Ta))  X 100 /  GCV of fuel
Where,
M = Moisture in fuel
Cp = Specific heat of flue gas in kcal/kg
10-% of heat loss due to moisture in air
Heat loss = AAS X humidity X Cp X (Tf-Ta) X 100/ (GCV of fuel)
Where,
AAS = Actual air supplied for combustion
Cp = Specific heat of flue gas in kcal/kg
Tf = Temperature of flue gas
Ta = Ambient air temperature
11-% of Boiler water blow down
Blow down % = (Feed water TDS X % of makeup water) X 100 / (Maximum permissible TDS in Boiler water –Feed water TDS)
12-Steam velocity in line
Velocity of steam in pipe line,V = Steam flow in m3/sec / Area of pipe line (A)
Steam flow in m3/sec = (Steam flow in kg/hr / Density of steam X 3600)
Area of pipe, A = Pi X D2 / 4
Where D is pipe internal diameter
13-Condensate flash steam calculation
Flash steam % = (H1-H2) X 100 / Hfg)
Where, H1 = Sensible heat at high pressure condensate in kcal/kg
H2 = Sensible heat of steam at low pressure in kcal/kg
Hfg = Latent heat of flash steam
14-Calculation of amount of heat required to raise the water temperature
Heat required in kcal=Mw X Cp X (T2-T1)
Where, Mw = Mass of water
Cp = Specific heat of water in kcal/kg (1 kcal/kg)
T1 = Initial temperature of water in deg C
T2 = Final temperature of water in deg C
15-Calculation of heat required to raise air temperature
Heat required in kcal=Mair X Cp X (T2-T1)
Where, Mw = Mass of water
Cp = Specific heat of flue gas in kcal/kg (0.24 kcal/kg)
T1 = Initial temperature of air in deg C
T2 = Final temperature of air in deg C
16-Surface heat loss calculation
S = (10 + (Ts-Ta) / 20) X (Ts-Ta) X A
S = Surface heat loss in kcal/hr m2
Ts= Hot surface temperature in deg C
Ta = Ambient air temperature in deg C
17-Dryness fraction of steam
X = Mass of dry steam / (Mass of dry steam + Mass of water suspension in mixture)
18-Heat content in wet steam
h = hf + xhfg
h= Heat content in saturated steam
x = Dryness factor of steam
Hfg =Enthalpy of evaporation
19-Heat content in dry saturated steam
h = hf + hfg
h= Heat content in saturated steam
Hfg =Enthalpy of evaporation
20-Heat content in superheated  steam
h = hf + hfg + Cps (Tsup - Ts)
h= Heat content in super heated steam
hfg =Enthalpy of evaporation
Cps = Specific heat of super heated steam
Tsup= Superheated steam temperature in deg C
Ts = Saturated temperature of steam in deg C
21-Calculation of Equivalent evaporation
Me = Ms X (h-hf) / hfg
Ms = Mass of steam
h = Steam enthalpy
hf= Feed water enthalpy
22-Factor of evaporation
Fe = (h-hf) / 539
23-Ash (Total) generation calculation
Ash generation in TPH = Fuel consumption per hour X % of ash in fuel / 100
24-Fly ash generation calculation
Fly ash generation in TPH = Fuel consumption per hour X % of ash in fuel X 80% / 100
25-Bottom  ash generation calculation
Bottom ash generation in TPH = Fuel consumption per hour X % of ash in fuel X 20% / 100
26-Calculation of ash generation in ESP
Ash generation in ESP in TPH = Fuel consumption per hour X % of ash in fuel X 80% X 80% / 100
27-Boiler safety valve blow down calculation
Blow down % = (Set pressure - Re seat pressure) X 100 / Set pressure
28-Calculation of attemperator water flow
Attemperator water flow  in TPH= Steam flow in TPH X (h1-h2) / (h2-h3)
h1 = Enthalpy of steam before desuper heating in kcal/kg
29-Economiser efficiency calculation
ηEco. = (Economiser outlet feed water temperature-Economizer inlet feed water temperature )  X 100 / (Economizer inlet flue gas temperature - Economizer inlet feed water temperature)
30-APH efficiency calculation
APH air side efficiency
ηAPHa = (Air outlet temp-Air inlet temp)) X 100 / (Flue gas inlet temperature -Air inlet temperature)
APH gas side efficiency
ηAPHg = (Flue gas inlet temp.-Flue gas outlet temp) X 100 / (Flue gas inlet temperature -Air inlet temperature )
31-Calculation of steam cost
Steam cost per ton = Steam enthalpy  in kcal/kg X Fuel price per ton/ (Boiler efficiency % X GCV of fuel used in kcal/kg)
32-Travelling grate Boiler heating surface calculation
Boiler heating surface (Appx) = Boiler capacity in kg/hr / 18
33-AFBC Boiler heating surface calculation
Boiler heating surface (Appx) = Boiler capacity in kg/hr / 22
34-Travelling grate slop fired Boiler heating surface calculation
Boiler heating surface (Appx) = Boiler capacity in kg/hr / 12
35-AFBC  slop fired Boiler (Low pressure up to 10 kg/cm2 WP) heating surface calculation
Boiler heating surface (Appx) = Boiler capacity in kg/hr / 8.2
36-Calculation of draught produced in Chimney
Hw = 353 X H (1/Ta – 1/Tg (Ma+ 1)/Ma)
H = Chimney height in meters
Ta = Atmospheric temperature in K
Tg = Flue gas temperature in K
Ma = Mass of air & Mass of flue gas = Ma+1
Also given as;
P = 176.5 X H / Ta
Hw = Chimney height in meters
Ta = Absolute atmospheric temperature in Kelvin
Hw = Draught in mmwc
37-Calculation of mass of flue gas flowing through chimney
Mg (kg/sec)= Density of gas (kg/m3) X Area of Chimney (m2) X Velocity of flue gas in Chimney (m/sec)
38-How to calculate the quantity of De-aerator venting steam?
De-aerator vent rate = 10.98 X Absolute pressure in deaerator X (D X D) Diameter of venting line orifice….Kg/hr
Note: Pressure in PSI
Diameter in inches
Or.
Steam venting flow = 24.24 X P(absolute pressure in PSI) X D X D (Size orifice in inch)........Lbs/hr
B-Turbine and Auxiliaries
1-Turbine heat rate calculation
a-Heat rate of Thermal power plant Turbine in kcal/kw =
Steam flow X (Steam enthalpy in kcal/kg-Feed water enthalpy in kcal/kg) / Power generation
b-Heat rate of Co-gen plant Turbine in kcal/kg =
Inlet steam flow X Enthalpy-(Sum of extraction steam flow X Their enthalpy + Exhaust steam X Enthalpy) / Power generation
i.e THR = ((Steam Flow x Steam Enthalpy)-(1St EXT Flow x Its Enthalpy + 2nd Ext flow x its Enthalpy + 3rd Ext flow x Its Enthalpy+ Exhaust Steam flow x its Enthalpy)) /Power Generation
Or
THR=((Steam Flow x Steam Enthalpy +Makeup Water flow x Its Enthalpy+ RC Flow x RC Enthalpy)-(Process-1 steam flow x its Enthalpy + Process-2 steam flow x Its Enthalpy+ FW Flow x FW Enthalpy)) /Power Generation
2-Turbine efficiency calculation
Efficiency = 860 X 100 /  Turbine heat rate
3-Steam condenser efficiency calculation
Condenser efficiency =Difference in cooling water inlet & outlet temperatures X 100/(Vacuum temperature-condenser Inlet temperature of cooling water)
Condenser efficiency = (T2 - T1) X 100/(T3 - T1)
T2: Condenser outlet cooling water temperature,
T1: Condenser inlet cooling water temperature,
T3: Temperature corresponding to the vacuum or absolute pressure in the condenser.
4-Vacuum efficiency calculation
Vacuum efficiency = (Actual vacuum in condenser X 100)/Max. Obtainable vacuum.
I.e
Vacuum efficiency in % =Actual vacuum X 100 / (Atmospheric pressure or barometric pressure-Absolute pressure)
5-Cooling tower range
Range = Cooling tower outlet water temperature-Cooling tower inlet water temperature
6-Cooling tower approach
Approach = Cooling tower outlet cold water temperature - Wet bulb temperature
7-Cooling efficiency calculation
Efficiency = Range X 100 / (Range + Approach)
8-Heat rejected or heat load of cooling towers
Heat load =Mass of circulating water X Specific heat of water Cp X Range
9-Cooling tower evaporation loss calculation
Evaporation loss in m3/hr = 0.00085 X 1.8 X Water circulation rate  m3/hr X Range
Evaporation loss in % = Evaporation loss X 100 / Water circulation rate  m3/hr
10-Cooling tower blow down loss calculation
Blow down loss in % = Evaporation loss X 100 / (COC-1)
Where COC: Cycles of concentration
Its generally calculated as;
COC = Conductivity in circulation water / Conductivity in makeup water
OR
COC = Chloride in circulation water / Chloride in makeup water
11-Calculation of mass of cooling water required to condenser steam in surface condensers
Mw = (Ms X (hfg X dryness fraction(x) + Cpw (T3 - Tc)))/(Cpw X (T2 - T1))
Mw = Mass of cooling water required in TPH
Ms = Mass of exhaust steam to condenser in TPH
Hfg = Enthalpy of evaporation at exhaust pressure in kcal/kg
Cpw = Specific heat of cooling water in kcal/kg
T3= Temperature at exhaust pressure in deg C
Tc= Temperature of condensate in deg C
T1=Cooling water temperature entering condenser in deg C
T2 = Cooling water temperature leaving condenser in deg C
12-Steam turbine wheel chamber pressure calculation (Appx)
Turbine wheel chamber pressure (kg/cm2 ) = (Turbine inlet pressure (kg/cm2 ) X Turbine operating load (MW) X 0.6) / Turbine rated capacity (MW).
13-Calculation of power generation in steam Turbine
Power generation in MW= Turbine inlet steam flow  in TPH X (Inlet steam enthalpy in kcal/kg- Exhaust steam enthalpy in kcal/kg) / 860
14-Power generation calculation in multi stage Turbines
Power generation in MW= Steam flow from 1st stage X (Inlet steam enthalpy in kcal/kg- 1st stage extraction steam enthalpy in kcal/kg) + Steam flow from 2nd  stage X (Inlet steam enthalpy in kcal/kg- 2nd  stage extraction steam enthalpy in kcal/kg) + Exhaust steam flow to condenser X (Inlet steam enthalpy in kcal/kg- Exhaust  steam enthalpy in kcal/kg) / 860
15-Calculation of work done per kg of steam in Turbine
Work done/kg of steam = Inlet steam enthalpy in kcal/kg-Exhaust steam enthalpy in kcal/kg
16-Calculation of steam required per per KWH
Steam required per KWH = 860 / (Work done per kg of steam)
Or
Steam required per KWH =860/(Inlet steam enthalpy in kcal/kg-Exhaust steam enthalpy in kcal/kg)
17-Thermal power plant efficiency calculation
Efficiency = 860 X Power generation / Heat input
Efficiency = 860 X PG X 100 / (Fuel consumption X Fuel GCV)
18-Co gen-plant efficiency calculation
Efficiency = 860 X Power generation X 100 / (Fuel consumption X GCV + Make up water X Make up water enthalpy + Return condensate water X Enthalpy-Process steam flow X Enthalpy)
19-HP heater steam consumption calculation
Steam flow in TPH = FW flow in TPH X (HP heater outlet FW temperature-HP heater inlet FW temperature) /(Steam enthalpy in kcal/kg-HP heater outlet condensate water enthalpy in kcal/kg)
Where, FW =  Feed water
20-Deaerator steam consumption
Mass of steam in TPH = (Deaeraor outlet Feed water flow in TPH X Enthalpy –CEP flow X Enthalpy-Makeup water X Enthalpy) / (Enthalpy of steam-Enthalpy of deaerator outlet water)
Note: Enthalpy in kcal/kg
Feed water, CEP water & Make up water flow in TPH
21-How do you calculate the heat load of oil coolers in steam Turbines??
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Power plant calculations involve various formulae depending on the type of plant and the parameters being analyzed. Some key formulae include:
  • Thermal Efficiency (η) = (Output Power / Input Power) × 100
  • Heat Rate (HR) = (3600 / Efficiency) kJ/kWh
  • Boiler Efficiency = (Heat Output / Heat Input) × 100
  • Turbine Efficiency = (Actual Work Output / Isentropic Work Output) × 100
  • Pump Work = (Flow Rate × Density × g × Head) / Efficiency
  • Steam Flow Rate = Power Output / (Enthalpy Drop × Efficiency)
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Power system operators maintain the stability of the grid through several key measures and strategies. These include:
1. Load Balancing: Power system operators continuously monitor the supply and demand of electricity on the grid. They ensure that the power generation matches the load requirements to maintain a balance between supply and demand. Load forecasting techniques are used to predict future demand, enabling operators to make necessary adjustments in power generation and distribution.
2. Frequency Control: Power system operators closely monitor the system frequency, which is an indicator of the balance between supply and demand. They employ automatic generation control (AGC) systems to adjust the output of power generators in real-time to maintain a stable frequency. If the frequency deviates from the standard range, corrective measures are taken to restore it to the desired level.
3. Voltage Control: Maintaining stable voltage levels is crucial for the efficient operation of the grid. Power system operators utilize voltage control devices, such as transformers, capacitors, and voltage regulators, to regulate and stabilize voltage levels. These devices are adjusted in real-time to ensure that voltage remains within acceptable limits, preventing voltage fluctuations that could disrupt the grid's stability.
4. Reactive Power Compensation: Reactive power is required to maintain voltage levels within acceptable limits. Power system operators employ reactive power compensation devices, such as synchronous condensers and static VAR compensators (SVCs), to provide or absorb reactive power as needed. By managing reactive power flow, operators can maintain grid stability and voltage control.
5. Grid Monitoring and Control: Power system operators utilize advanced monitoring and control systems to continuously monitor the grid's performance. Supervisory control and data acquisition (SCADA) systems, along with real-time data from sensors and meters, provide operators with detailed information on grid conditions. This enables them to identify potential issues and take corrective actions promptly.
6. Grid Planning and Expansion: Power system operators also play a role in long-term grid planning and expansion. They analyze future load growth, renewable energy integration, and infrastructure requirements to ensure that the grid remains stable and reliable. This involves assessing the need for new transmission lines, substations, and power generation capacity to meet future demand.
7. Emergency Response and Restoration: In the event of disruptions or emergencies, power system operators are responsible for coordinating emergency response efforts. They work to quickly identify and isolate faults, reroute power, and restore the grid's stability. This involves close coordination with grid operators, power generation companies, and other stakeholders to minimize the impact of disruptions.
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Frequency and Voltage Control plays a crucial role in maintaining power grid stability
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ok
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Your idea is very good, you can use the Internet of Things technology to achieve this remote monitoring.
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Is it moral, socially and environmentally ethical for large dominant power companies generating energy mainly from burning coal and lignite to turn off other RES-based energy sources, is it consistent with climate policy and is it consistent with human rights?
In a situation of rising energy prices and the need to accelerate the processes of green transformation of the economy, is it moral, social and environmental to shut down the large dominant power companies that generate energy mainly from burning coal and lignite other sources of energy, including mainly the cheapest and emission-free generation of electricity, shutting down power plants based on photovoltaic panels, not accepting periodic increases in energy production generated from the sun and wind, so as not to reduce energy production from dirty, high-emission energy based on burning coal is moral, socially and environmentally ethical, is in line with climate policy and is in line with human rights?
I ask because such an irrational situation exists in the country where I operate. In my opinion, in a situation of rising energy prices and the need to accelerate the processes of green transformation of the economy, the shutdown of power plants based on photovoltaic panels by the large dominant power companies that produce energy mainly from the combustion of coal and lignite other sources of energy, including mainly the cheapest and emission-free production of electricity, not adopting a periodic increase in energy production generated from the sun and wind, so as not to reduce energy production from dirty, high-emission coal-burning power plants is not moral, socially and environmentally ethical, not in line with sound climate policy and not in line with human rights. The key problem with climate, environmental and energy policy is that it is not conducted fairly. Instead, it is conducted haphazardly, shortsightedly, unstrategically and is politicized in the negative sense of the word. Despite the fact that most of the mining sector, coal and lignite mines, companies in the energy sector and the country's largest fuel and energy company, which holds more than 90 percent of the domestic market share in the sale of motor fuels, are state-owned companies and could carry out in an efficient, comprehensive and strategic manner the process of green energy transition, they unfortunately do not do so. There are many indications that climate, environmental and energy policies are being conducted haphazardly and short-sightedly. The full synergy and correlation that should occur between these policies is missing. Unfortunately, economic aspects are also not key, as they are mixed with political aspects, in which the economic calculus is not treated as a principled factor, and this is in addition to the high level of indebtedness of the state's public finance system and the growing level of the budget deficit in the central state budget. The government has pledged to implement the green transformation of the economy in accordance with the European Union's Green Deal plan. The country receives subsidies from the European Union for the implementation of this plan, including subsidies from the National Reconstruction Plan, which should be allocated mainly to efficiently carried out green investments to carry out the green transformation of the energy industry and achieve the goal of building a sustainable, emission-free energy industry in the shortest possible time. However, this is not happening. Onshore wind power development is still administratively and normatively largely restricted. On sunny, cloudless days and when the wind is blowing, additional energy is generated from already installed photovoltaic panels and wind farms, which is not collected from prosumers by large power companies due to unsuitable transmission networks. Besides, the dominant power companies in the market do not collect clean energy from the mentioned RES sources in order not to reduce the production of energy generated by the conventional method of burning coal and lignite. In addition, the dominant energy companies are lobbying in the political sphere to restrict the development of RES and are causing restrictions on the process of issuing permits for citizens to make further connections to the power grid of prosumer wind turbines and/or photovoltaic installations built by citizens. In addition, there is another extension of the start of construction and implementation of the project to build the first nuclear power plant in a country where the energy industry still relies 3/4 on conventional energy production, i.e. on the basis of burning fossils, much of which is imported, there are situations of energy shortages and eggs to buy from abroad, and the quality of air due to the dominance of combustion energy in the heating season is among the worst in Europe. On the basis of my research, I conclude that this activity is immoral, socially and environmentally unethical, does not comply with climate policy and is not compatible with human rights. Confirmation of the aforementioned thesis is provided by the results of the research I described in my publications given below.
In the following article, I have included the results of the research conducted on the connection of the issue of sustainable development, the genesis and meaning of the Sustainable Development Goals, the essence of sustainable development in the context of social, normative, economic, environmental, climate, and human rights aspects, etc. The research also addressed the issue of key determinants of human existential security as an element of the concept of sustainable development.
HUMAN SECURITY AS AN ELEMENT OF THE CONCEPT OF SUSTAINABLE DEVELOPMENT IN INTERNATIONAL LAW
I am conducting research on this issue. I have included the conclusions of my research in the following article:
IMPLEMENTATION OF THE PRINCIPLES OF SUSTAINABLE ECONOMY DEVELOPMENT AS A KEY ELEMENT OF THE PRO-ECOLOGICAL TRANSFORMATION OF THE ECONOMY TOWARDS GREEN ECONOMY AND CIRCULAR ECONOMY
The key issues of the problematic sources of Poland's exceptionally deep energy cross in 2022 are described in my co-authored article below:
POLAND'S 2022 ENERGY CRISIS AS A RESULT OF THE WAR IN UKRAINE AND YEARS OF NEGLECT TO CARRY OUT A GREEN TRANSFORMATION OF THE ENERGY SECTOR
In view of the above, I address the following question to the esteemed community of scientists and researchers:
In a situation of rising energy prices and the need to accelerate the processes of green transformation of the economy, does the shutdown of other sources of energy by the large dominant power companies that produce energy mainly from the combustion of coal and lignite, including mainly the cheapest and emission-free production of electricity, shutting down power plants based on photovoltaic panels, not accepting periodic increases in energy production generated from the sun and wind, so as not to reduce energy production from dirty, high-emission power generation based on burning coal is moral, socially and environmentally ethical, is in line with climate policy and is it compatible with human rights?
Is it moral, socially and environmentally ethical for large dominant power companies that generate energy mainly from burning coal and lignite to shut down other RES-based energy sources, is it consistent with climate policy and is it consistent with human rights?
What do you think about this topic?
What is your opinion on this issue?
Please answer,
I invite everyone to join the discussion,
Thank you very much,
Best regards,
Dariusz Prokopowicz
The above text is entirely my own work written by me on the basis of my research.
In writing this text, I did not use other sources or automatic text generation systems.
Copyright by Dariusz Prokopowicz
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Dear Dariusz,
Thank you for posing a technical question that combines international law (consensus decisions by the world's peoples, put into treaties, on the key approaches consistent with human survival and with the long term survival of their nations and the cultures within them and that are essentially the definition of universal "morality") with social science standards. My answer as an international lawyer and social scientist is a definite YES, through application of the UN Genocide Convention, the UN Convention on the Rights of the Child (CRC), and other resolutions that are implementing documents that specify indigenous people's rights to their environments and their protection as well as declarations on sustainability like the Rio Convention. This isn't directly enforceable on energy/power companies since the law binds governments to act, but many such companies are state owned and of course they are state chartered and regulated, and this question isn't just about energy companies. It applies to other actors as well, including the international community itself. You can see in my articles on ResearchGate that I have analyzed the UN's Sustainable Development Goals (SDGs) as themselves in violation of international law (and largely promoting company interests) and even the discipline of Economics ("Is Ecoomics in Violation of International Law?") to show how the standards would be applied in courts under international law.
David Lempert, Ph.D., J.D., M.B.A., E.D. (Hon.)
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How is biomass energy essential in the power generation in a country.
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According to several sources, biomass energy is crucial in power generation in many countries. Here are some key points:
  1. Electricity Generation:
    • Biomass can be burned directly to produce electricity. It’s used in power plants where biomass (such as wood, agricultural residues, and organic waste) is combusted to generate steam, which drives turbines connected to generators.
    • Co-firing biomass with coal in existing coal-fired power plants reduces greenhouse gas emissions and diversifies energy sources.
  2. Heat Generation:
    • Biomass provides heat for industrial processes, district heating, and residential use. It’s especially important in colder climates.
    • In Europe, biomass accounts for 87% of heat produced from power plants.
  3. Biofuels:
    • Liquid biofuels (like biodiesel and bioethanol) are derived from biomass and used in transportation.
    • They contribute to energy security and reduce dependence on fossil fuels.
  4. Sustainability and Policy:
    • Sustainable biomass management is critical to prevent deforestation and ensure a continuous supply.
    • Policies like the Renewable Energy Directive in Europe, which sets targets for using renewable energy in the EU, promote responsible bioenergy use.
It is important to note that the impact of biomass energy varies by country, depending on available resources, technology, and policy frameworks.
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New future of power generation
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While solar tower technology is a promising renewable energy source with significant potential, it's unlikely to completely replace conventional sources of energy like fossil fuels and nuclear power on its own.
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Dear All, Where can I download hourly whole-year solar power generation data for free?
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I can't do that because the data are proprietary. You will find this for most data sets. Why do you need to know the location? If you are hoping to model a prospective solar field site, there is software available to do that, though some of it (e.g., PVSyst) is extremely expensive. For a particular location, cloud cover (i.e., clear sky vs. actual DNI) is very important. Phoenix, Arizona is known for their clear skies but even that doesn't translate into solar power, as this curve shows (based on NREL data).
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I'm interest in MHD power generator, especially using salt water flow under transverse magnetic field.
In this paper, they assume that the e.m.f as f0=4w(B_0)(V_E) constant value independent of the hall current. However I think that if we connect the electrode, the ions are eliminated by reduction and oxidation on the electrode surface. So the removing charge effect will decrease the e.m.f value.
So I want to know my guess is reasonable and way how to get the maximum power produced by the device.
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Power factor mainly depending on load ….
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I need how signal from Governor passes to Turbine, gear box and alternator to develop particular desired power?
My under standing is as below
Pl.correct me
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The answer to your question is in my paper
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What are the most commonly used machine and deep learning algorithms? Specifically, for forecasting hourly solar power generation.
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Here are some specific machine and deep learning algorithms that are commonly used for forecasting hourly solar power generation:
  • Artificial neural networks (ANNs) are a popular choice for forecasting hourly solar power generation because they can learn complex relationships between input and output data. ANNs have been shown to be effective for forecasting hourly solar power generation, even when the data is noisy or non-linear.
  • Support vector machines (SVMs) are another type of machine learning algorithm that can be used for forecasting hourly solar power generation. SVMs are good at finding patterns in data, even when the data is not well-behaved. However, SVMs can be sensitive to outliers, so it is important to carefully clean the data before training the model.
  • Random forests are a type of ensemble learning algorithm that combines multiple decision trees to make predictions. Random forests are often used for forecasting because they are able to handle noisy data and are relatively robust to overfitting. However, random forests can be computationally expensive to train, so they may not be a good choice for large datasets.
  • Long short-term memory (LSTM) networks are a type of deep learning algorithm that is specifically designed for forecasting time series data. LSTM networks are able to learn long-term dependencies in the data, which makes them well-suited for forecasting hourly solar power generation. However, LSTM networks can be difficult to train, and they may not be a good choice for small datasets.
In addition to these algorithms, there are a number of other machine and deep learning algorithms that can be used for forecasting hourly solar power generation. The best algorithm to use will depend on the specific characteristics of the data and the desired forecasting horizon.
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Where can find hourly renewable energy power generation in various provinces of China?
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Xilin Cao you can find hourly renewable energy power generation data for various provinces in China from a few different sources. One possible source is the China National Renewable Energy Centre (CNREC), which provides data on renewable energy generation, consumption, and capacity for different provinces in China. The CNREC publishes annual reports on renewable energy, which include data on hourly renewable energy generation for each province.
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What are the factors that affect membrane power generation?
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  1. Increase the surface area of the membrane: A larger membrane surface area can lead to a larger electric potential and current output. This can be achieved by increasing the number of membranes or by using a larger membrane surface area.
  2. Optimize the membrane composition: The properties of the membrane, such as its selectivity and permeability, can significantly impact the performance of the membrane power generation. By optimizing the composition of the membrane, such as its thickness, pore size, and material properties, the efficiency of the power generation process can be improved.
  3. Improve the solution composition: The composition of the solutions on either side of the membrane can also affect the power generation performance. By optimizing the concentration and pH of the solutions, the electric potential and current output can be increased.
  4. Enhance the ion transport: The ion transport across the membrane is the fundamental mechanism for generating electric potential and current. Enhancing the ion transport through the membrane, for example, by applying an external electric field or modifying the membrane surface properties, can improve the power generation efficiency.
  5. Utilize multi-stage processes: By connecting multiple membrane power generation stages in series, the overall signal can be enhanced, leading to higher electric potential and current output.
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We are conducting a research on "ELECTRICITY ENERGY IN AFRICA’S DEVELOPMENT GOALS, THE CHALLENGES AND PROSPECTS: THE CASE OF NIGERIA".
Your expert answer (s) will be highly appreciated.
Best regards,
Ajinde Oluwashakin and Ayodeji Salau
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Main problems are demand is more than the supply hence for economy, efficiency and reliability could be achieved by proper power management and priority based load shedding. Could refer my paper “ Automatic microprocessor based load shedding controller “ though same could be implemented manually for better efficiency, reliability and system economy…..
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Can we model an information system to create a sync between different power generation units to generate power in most economic way based on current weather condition?
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I think most utility scale energy management systems have been able to do this for many years. Load can be estimated on a combination of historical data and current weather forecasts such as temperature and cloud cover.
The total load demand can then be used in an economic dispatch application to allocate the most economic generation (including virtual power plants).
As Samir mentioned, the big challenge is to how to prepare the data models.
These have to link the loads, typically defined according to the electrical network, with the weather forecasts, typically available in squares of several 10s of km.
Historical data can be used to make the correlations or train AI but this is now more complicated as the number of solar panel installations grows every year.
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In the carbon cap and trade market, How to calculate the carbon cap for the power generating units?
Please share any idea or documents
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Thanks for your answer
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I made this hybrid power plant simulation with HOMER where I assumed the solar power plant system doesn't have enough irradiation so it can't produce any power and it's just the wind power plant system that worked. It turned out that the result is the consumption power (AC Primary Load) is bigger than the power generated by the wind turbine. Is it okay? How do I solve this problem?
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The wind turbine's production is heavily influenced by wind speed. Until the wind exceeds the rated speed, generated power grows as the cube of wind speed. As long as the wind speed is below the cut-off speed after the rated speed, the wind turbine will continue to produce a fixed quantity of power. On the other hand, no wind energy would be produced if the wind speed was higher than the cut-off speed or lower than the cut-in speed.
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I am trying to find a historical database with wind power generation being dispatched so I could use it for my simulation. I know AEMO wind power dispatched power generation historical data. But I want another place that isn't Australia. Is there any other website of database that has public databases such as AEMO?
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There are 159 wind datasets available on data.world.
One of them is: wind data on data.world | 159 datasets available
Another is: Wind energy database (thewindpower.net).
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Hi! I am trying to implemet an control algorithm to give a command to my energy storage system when to charge to absorb excess renewable power generation and discharge when renewable power generation is low. I am using matlab/simulink tool. Any recommendations would be appreciated.
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Thank you Hassan Nasser, those articles and links wil be really helpful! Thank you for your response!
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How many ways to capture radiative heat transfer and convert it into electricity?
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There is some work being done on carbon nano-structured surfaces which can collect a wide range of wavelengths. Aside from potentially improving on silicon based solar panels, there is also the possibility of collecting low grade waste heat in the form of IR radiation. Still early days though.
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One technology, carbon capture and storage (CCS), stands tall for its ability to help energy-intensive sectors like power generation and heavy industry reduce their emissions. In fact, the International Energy Agency has said without CCS, achieving the world’s lower-emission targets will be virtually impossible. While the technology isn’t new, it is increasingly coming to the forefront of the climate conversation. But what is carbon capture and storage?
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CO2 emissions are rising globally in a nearly monotonic way. The only significant changes in emission rates have been associated with global economic downturns, with no evidence that they will peak any time soon. While everyone should support the development of rational renewables, they have not and probably cannot substantially replace fossil fuels in many industries. Carbon capture is essential to the success of any realistic climate mitigation technology. Also, the term carbon capture is nearly universal, but what it really means is carbon dioxide capture (separation of CO2 from other gases, most commonly in fossil energy exhaust streams). Storage is isolating this carbon in some location where it does not reenter the atmosphere either by converting it to useful, non-volatile products or by sequestering it in geologic storage locations such as sealed, underground aquifers. The current emission rates of CO2 exceed the sum of non-fuel use of carbon by very large margins, so while CO2 conversion to products in rational ways has many advantages, it is hard to see how such activities could contribute at the same level as sequestration.
Full disclosure here that we have developed a much cheaper and energy efficient process (Cryogenic Carbon Capture(TM)), though this response is not specific to that or any other technology.
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Is this footstep power generation concept not considered due to its low efficiency?
Any novel methods to improve the power output?
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Thank you Hassan Nasser
I also agree with you Bhupendra Desai .
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It is well-understood that depends on the power system strength or system inertia in addition to the speed protection system settings.
I just would like to see some typical values for such imbalance either normalized or in MW.
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Dear Omar,
As it is rightly answered by the eminent experts of the field. I just want to add some frequency security parameters followed by interconnections.
The conventional frequency response requirement range prescribed by the ENTSO-E for dead band, droop and response delivery time is 0-500 mHz, 2-12% and 2 s-30 s, respectively. The standard technical requirements for new fast frequency reserve services by the ENTSO-E comply with the reserve activation instant at zero seconds immediately after an imbalance. The maximum time required for a complete response activation is 0.70 s for a 0.5 Hz frequency deviation from the nominal value, 1 s for a 0.4 Hz frequency deviation, and 1.30 s for 0.3 Hz frequency deviation. The minimum response for the short duration of support is 5 s and 30 s for the long duration of support.
North American Electric Reliability Corporation (NERC) and Federal Energy Regulatory Commission NERC BAL-003-1, FERC Order 842 specifies the criterion for dead band 36 mHz, for droop 5%, and the delivery should be without any delay and sustain for at least 30 s.
Newly admitted fast-responding frequency response services in the global power grids such as Synchronous Inertial Response (SIR), Fast Frequency Response (FFR), Enhanced Frequency Response (EFR) and Dynamic Regulation Signal (RegD). The SIR service is provided instantly as compared to the FFR, EFR and RegD services, which are provided within 0-2 s. The deadband for the SIR, FFR, and EFR services is 17-36$ mHz, 15- 200 mHz, 15- 50 mHz, respectively. The droop for SIR service is 3-5 % and EFR service is provided through two envelopes.
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Please Share IEEE 118 bus generator data ( especially Reactive power generation, Volatge phase angle ). In all website s Q generation at every bus is zero for all buses(Is it True) - Manpower as 118 case as reference.
how much real reactive power losses in IEEE 118 Bus system ( share any papers)
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Here is the generator data for the IEEE 118 bus test system.
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I have a small topic on material research to fulfill at my university. I am very new to material science. Good Sources to research for material knowledge and suggestions for my above question is very much appreciated. Thank you in advance !!!
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In addition to various bronzes (not Brasses!), stainless steels can be used for this. There are advantages and disadvantages of these two material groups for the turbine impeller application.
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Is there any work being done on Tidal form of power generation?
If yes, how much work has been done?
If no, why hasn't there been any steps taken?
What are the factors that are acting as hindrance?
Can we see this form of power generation in future of Pakistan?
I need all the details regarding Tidal Power Generation in Pakistan.
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In comparison to other renewable energy sources, tidal power is yet to be operational in Pakistan. In Sindh, two locations are accessible to use tidal energy: a 170 km creek system in the Indus delta and two to five-meter tidal heights at the Korangi Creek.
According to research undertaken by the National Institute of Oceanography, the creek network in the Indus deltaic region, which stretches over 70 kilometers along the Arabian Sea, can create 900MW of tidal power on its own.
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Power Network Expansion Planning is the problem of deciding the new transmission lines that should be added to an existing transmission network in order to satisfy system objectives efficiently. It is one of the main strategic decisions in power systems and has a deep, long-lasting impact on the operation of the system. Several challenges such as deregulation, renewable penetration, large-scale generation projects, market integration, and regional planning are discussed in the literature to some extent.
In the context of the smart grid, what can be the potential future challenges in terms of different scenarios, applications, modeling, solution, and novel devices in the network?
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Two main problems in the perspective of SG:
*Integration of Microgrid, while considering uncertain factors and limitations of the present grid.
*Integration of charging stations for EVs taking into view users' profiles and traditional grid capacity.
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I am doing a project on power generation using multiple humps. Force is known. All the respective gear and shaft radii are known. y using this, this I can found torque using the relation T=F*l ...
I have a relation P=2 pi NT.. but in this relation power and rpm are unknown...
Is there anyway to find the power or rpm? Any other formula to find power with respect to rpm if available then please share.
Thanks
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First try to find the work done in required time and then proceed with "N"
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to electrify rural areas cost effective power generation is important. from those alternatives MHP generation using SEIG will fulfil the community power demand in lower cost. but SEIG hve the problem of voltage regulation during load variation. to regulate terminal voltage IG there are different way of classical controling method but how to control the voltage using artificial intelligence to andvance the controling system to protect power electronics equipments that are sensetive to voltage varation.
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Please note that you need a control system.
The output have a reference voltage that tries to keep no matter what the load is.
This is done using feedback control system.
The feedback control system can be
modeled using recurrent neural network.
For the feedback control system
please read my paper
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Hello everyone, I'm working on predicting PV system power generated using AI, so I need a database to train my model. Where can I find a database with minutes time step (less than hour, preferably 1 minute) of system power generated ?
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Hello
I have two transformers (each one is 63MVA) in one station. 132 MW generator was injected into this station successfully. If the second generator (132 MW) will be joined to the same station, how will it be that possible and performance of both generators?
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The total MVA rating of the transformers is 126 MVA. Theoretically, you cannot even operate the 132 MW at full load, as it is higher than the total MVA capacity of the transformers. In case, you want to connect the second generator due to economics or operational constraint, you have to make sure that the total generation does not exceed 126 MVA.
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Hello Experts. Generating solar energy using PV systems results always in the variable power generation due to the effects of intermittency. What parameter is mostly affected by solar intermittency on the grid and what techniques do grid operators use to mitigate such effects.
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Dear Amashisha:
At the first, I think the following link contains all the articles on the topic of your research:
+++++++++++++++++++++++++++
And you could benefit from this article about your topic:
"Renewable Energy Intermittency Explained: Challenges, Solutions, and Opportunities".
++++++++++++++expert's opinion++++++
Finally, I thought to add the following:
This illustrated one of the big challenges to renewable energy: they are intermittent energy sources. A coal power station can run as long as you have coal to shovel into its furnaces. Wind power only operates when the wind blows, and solar photovoltaics need cloudless skies to reach their full capacity. Surely, say the critics, too much renewable energy puts us at the mercy of the elements? The greater the percentage of wind or solar in our energy mix, the more likely we are to end up with rolling blackouts. It’s a logical question, but there are the following solutions:
1- The grid itself:
The first and biggest answer to this problem is the grid. Power stations feed into a national grid that balances inputs and outputs across the whole country. When demand rises, new capacity is brought online. At night, demand drops off and supply drops accordingly. It’s a highly versatile system, able to handle massive spikes in demand. The famous example is half-time during big football matches. The whistle blows, and everyone goes into the kitchen to switch on their kettles for a cup of tea, or opens their fridge for another beer. The National Grid refers to these as ‘tv-pickups’ and plans ahead for them so that the lights don’t go out.
It’s easy to take functioning power infrastructure for granted. If you’ve lived off-grid or in a developing country, you’ll know the luxury of not having to think about it. When I lived in Madagascar, the power levels dropped so low at night that we couldn’t switch on the TV. If you wanted to watch something that night, you had to remember to turn it on at about five o’clock and leave it on standby. By the time it had got dark and everyone had turned on their lights, there would be enough power to run it but not to turn it on. By day, you had to holler if you were going to boil the kettle. If you forgot, there would be wails from the office as someone lost their homework as the computer blinked off.
Those sorts of eccentricities don’t happen in Britain. At least not any more. The idea of balancing power supplies across the country goes back to 1926, and today the grid incorporates 181 major power stations and thousands of smaller installations. This infrastructure allows us to plug in a variety of variable energy sources, and the broader the network, the easier it becomes.
2- The super-grid:
You can broaden the network beyond our own borders too. Interconnectors already link our grid with France, Ireland and the Netherlands. There are plans to build links to Norway and Belgium too, and a feasibility study was launched last month to see if we could connect to Denmark. Iceland has far more geothermal capacity than it can use itself, and is investigating ways to export it to Britain.
None of this infrastructure is cheap, but the fact that we already have three international links proves that it isn’t prohibitively expensive either. Whether we can afford a Europe wide grid with links to North Africa is another matter, but you can see the advantages of spreading the net as wide as possible. If the sun isn’t shining here right now, it might be in Devon. It might be a calm day in London, but the wind is blowing in Scotland. Expand that principle South to Spain and north to Sweden, and you’ve got a wide variety of conditions.
3- Stabilising demand:
I’ve already mentioned the issue of peaks in demand. Some of these are unusual, like football matches. Others are regular, when people get up and make breakfast, or get home from work in the evening and turn on their lights and cook their supper. Coal power is one of the easiest ways to deal with these large peaks, as they can be switched on quickly. There are renewable energy equivalents, using biomass and incineration (or see hydropower below), but a better approach would be to avoid the extremes in the first place.
That be done through more efficient technologies – if everyone is switching on low-energy light bulbs at twilight, that’s a much lower step in demand than everyone switching on an incandescent. Another way of stabilising demand is through smart appliances that can read demand and respond accordingly. Fridges don’t run constantly, but maintain a steady temperature by switching the cooling mechanism on when needed. A smart fridge would time its cooling cycles to periods of low demand. A smart washing machine would automatically run off-peak when energy prices are cheapest. Samsung, LG and others already offer appliances with this kind of technology.
4- Energy storage:
Those living off-grid with their own solar or wind power rely on batteries to make sure that they capture energy when its there, and can use it later. That would be pretty useful in the national grid too, if we could store the solar energy from a sunny day to use it at night. Currently there’s no form of battery big enough to do that, but there are a few other options. One is pumped storage hydropower. When energy is cheap, water is pumped uphill to fill a reservoir. When needed, gates can be opened and it runs back downhill through turbines, generating electricity. This is the renewable energy way of dealing with demand spikes, and also a way of storing intermittent sources. Dinorwig power station is housed underground inside a Welsh mountain, and can bring 1.8GW of power online in 12 seconds.
If you haven’t got a suitable lake, the same thing could be achieved with rail cars, according to a California company. They’re developing a model where surplus energy is used to haul heavy rail cars uphill when wind or solar power is running at full capacity. When it drops off, the cars are released to roll back downhill, generating electricity on the way.
You can also ‘bank’ energy in the ocean, taking advantage of the pressure of the deep sea. A team at MIT suggest that large hollow concrete spheres could be sunk on the seabed near offshore wind turbines. Excess energy would be used to pump out the spheres. When the wind dropped, water would rush back in through a turbine.
Another form of energy storage is solar thermal. I’ve written about it before so I won’t go into detail here, but it essentially stores heat in molten salt, and allows solar power stations to carry on generating electricity through the night. This turns solar energy into a form of constant renewable energy.
5- Constant renewable energy:
Speaking of which, wind and sunshine are intermittent, but there are other natural forces that are much more predictable. Hydropower is one such source, using the steady flow of rivers. There are countries in the world that generate all their electricity from hydropower, and are thus enjoying 100% renewable energy. Hydropower is often overlooked because while it is renewable and clean, it isn’t always environmentally benign and has large capital costs. Large dams are often hugely destructive and displace entire communities. But there is good hydropower too, and I may have to dedicate a separate post to it.
There’s also a whole lot of energy to be sourced from the sea. Harnessing wave power is one approach, but doesn’t count as a constant renewable source because waves are variable. Tidal power does count however, as there’s always a tide. So far, tidal power requires a barrage across a suitable estuary. Like dams on land, dams across estuaries are just as controversial – see the running debate about the Severn Barrage. But there are simpler and smaller ways to harness tidal power too, placing turbines on the sea bed, or using the vertical movement of the tides rather than the vertical. Ecotricity are trialling a hybrid sea technology that uses sea swells to pump water onshore, which is a lot simpler than generating the electricity out on the open sea.
Geothermal provides another source of constant renewable energy. Britain has limited geothermal capacity, and is more useful for providing heat than electricity, but there is still untapped potential. The main reason that geothermal hasn’t been pursued in Britain is that it hasn’t been economical so far, but as the price of energy rises, it is becoming more viable. The Eden Project is pioneering a geothermal plant in Cornwall, the first of what it hopes will be a fairly substantial contribution from Cornwall’s ‘hot rocks’.
Biomass and anaerobic digestion (biogas) are two more renewable energy sources that are often overlooked. Biomass is best reserved for smaller and more localised energy generation, and the current practice of co-firing biomass with coal is a short term option. Biogas is generated from waste, so it doubles up as a useful way of dealing with rubbish otherwise destined for landfill, and its main waste product is a liquid that can be used as fertiliser.
6- Lowering energy use:
Even with these various technologies and techniques, renewable energy can never be a direct swap for fossil fuels. Coal, oil and gas are very dense forms of energy, and deliver a high energy return for energy invested. Renewable energy cannot match it, and if we are to rely on renewable energy more in the future, we will have to reduce our energy use. That’s entirely possible, given how inefficient our houses are, how much electricity is lost in transmission and how low our standards are for appliances.
Quite how far we need to reduce our energy use is debateable, but those assuming we can expand it or carry on as usual aren’t paying attention. The Zero Carbon Britain report, which aims for 100% renewable energy by 2030, assumes a 55% reduction.
I hope it will be helpful...
With my best regards....
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I'm working on a single chamber microbial fuel cell with air-breathing.
Its voltage already reached approximately 400 mV under OCV conditions, but when I used a 1000 ohm external resistor the voltage immediately drops to zero.
I already used a 10K resistor but the voltage hardly reached 30 mV and it's very low.
I don't know what the problem is!
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Indeed the external resistance should be comparable to the internal resistance. However, during the starting stage, the internal resistance is supposed to gradually decrease due to the development of functional microbial film on electrodes. So there is no rule, and you may yield different MFCs when apply different resistors.
There are some advices: The internal resistance depends on the surface area of the electrodes and the distances between the electrodes. If the area is huge and the distance is close, choose a resistor less than 1 k ohm, If not, choose more than 1k ohm. If you have no idea, just use any resistor and monitor the CCV for several days. For a conventional MFC, the OCV varies from 0.5 to 0.8. The CCV will decrease dramatically when loaded and slowly recover. If not recover, use bigger resistor; if no significant decrease, use smaller resistor.
Also depends on the purpose. If you want to obtain the maximum power output, the external resistance should be similar to the internal resistance. If the objective is the maximum exolectrogenic biomass growth, the external resistance should be lower to avoid current limitations. Exoelectrogenic activity is proportional to the current intensity; if your intensity is low (higher external resistance), exoelectrogens growth will be limited. When the cell is working at OCV (infinite resistance), intensity is zero and no exoelectrogenic activity is possible.
So you could benefit from these two valuable articles:
First....
"Microbial Fuel Cells: Influence of External Resistors on Power, Current and Power Density".
By: Kamau JM, Mbui DN, Mwaniki JM, Mwaura FB and Kamau GN.
Abstract:
The effect of external resistance on voltage, current, power, power density and current density is investigated in a microbial fuel cells using cowdung is investigated. This involves use of varying resistance resistors. The fuel cells
were operated under anaerobic condition for 9 days. PVC pipe was used to make a salt bridge using lamp wicks and potassium chloride. The obtained results indicated that the maximum voltage was on day 7 with 0.153 V across 33 kΩ resistor. The power was in the range of 0.000001 to 0.01 mW, current density was in the 0.1 to 23.29 mA/m2 range while the power density was in 7.5 × 10-7 to 3.1036 mW/m2 range.
And this is the second article:
"The Influence of External Load on the Performance of Microbial Fuel Cells"
By: Szymon Potrykus , Luis Fernando León-Fernández , Janusz Niezna ´nski
, Dariusz Karkosi ´nski.and Francisco Jesus Fernandez-Morales.
Abstract:
In this work, the effect of the external load on the current and power generation, as well as on the pollutant removal by microbial fuel cells (MFCs), has been studied by step-wise modifying the
external load. The load changes included a direct scan, in which the external resistance was increased from 120 Ω to 3300 Ω, and a subsequent reverse scan, in which the external resistance was decreased back to 120 Ω. The reduction in the current, experienced when increasing the external resistance, was maintained even in the reverse scan when the external resistance was step-wise decreased.
Regarding the power exerted, when the external resistance was increased below the value of the internal resistance, an enhancement in the power exerted was observed. However, when operating
near the value of the internal resistance, a stable power exerted of about 1.6 µW was reached. These current and power responses can be explained by the change in population distribution, which shifts to a more fermentative than electrogenic culture, as was confirmed by the population analyses.
Regarding the pollutant removal, the effluent chemical oxygen demand (COD) decreased when the external resistance increased up to the internal resistance value. However, the effluent COD increased
when the external resistance was higher than the internal resistance. This behavior was maintained in the reverse scan, which confirmed the modification in the microbial population of the MFC.
I have attached the pdf files ....
I hope it will be helpful...
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"THIS IS AN ABSOLUTELY SCIENTIFIC QUESTION"
Everything has a price, that is, everything has advantages and disadvantages. Nature doesn't give anything away for free!
In case of electrical generation of any kind, it always requires a lot of impact study. Enthusiasm often obscures clarity of actual impacts.
Tell us your scientific opinion about use of electric wind energy in tseas?
VERY IMPORTANT: Participate only if you are original, be yourself give your opinion, do not put links or texts from "Genio Google" or things found out there on the web! No one has any interest in stupid web answers, if that's the case, please be so kind as to ignore this debate!
SOURCE LINK:
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Dear friend, Professor Filipe Wiltgen!
Thank you very much for your interesting question!
Energy security is the most important factor in the development of a country, especially one that has a shortage of traditional resources. In this case, renewable energy is one of the possible ways to solve the problem, where a significant role is assigned to wind generators. Compact offshore wind turbines are already occupying their niche in the market and their share will grow. This can be confirmed by the advantages that are described in the above and other materials. At the same time, you need to take into account, for example, the problems of this winter in Texas and the dull look of frozen wind turbines with subsequent energy problems. And that means need balance, balance, and compliance!
Best wishes!
With deep respect, Vоlоdymyr Naumchuk
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I want perform a time series analysis on real time data of hydropower/hydroelectric power generation of different dams of India.
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This link will be of use to you:
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I am going to conduct a survey among the experts who are working in power plant construction projects in my country. So far I know, construction of 30 mega projects are going on. The targeted experts are 7-categories, for example, contractors, sub-contractors, vendors, project director (PD), project manager (PM), site engineer, and consulting engineer (or consultant). The other variables are project size in terms of power generation capacity, budget, project location, experts' experience (year), and academic qualification. Please suggest me in a precise way to save my time? I am now in a critical moment. I have a presentation just after couple of weeks. Thank you for your patience and time. 
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Dear, Muhammad Saiful Islam, this link will help you in your research:
Determining the sample size in a quantitative research study is challenging. There are certain factors to consider, and there is no easy answer. Each experiment is different, with varying degrees of certainty and expectation. Typically, there are three factors, or variables, one must know about a given study, each with a certain numerical value. They are significance level, power and effect size. When these values are known, they are used with a table found in a statistician's manual or textbook or an online calculator to determine sample size.
Choose an appropriate significance level (alpha value). An alpha value of p = .05 is commonly used. This means that the probability that the results found are due to chance alone is .05, or 5%, and 95% of the time a difference found between the control group and the experimental group will be statistically significant and due to the manipulation or treatment.
Select the power level. Typically a power level of .8, or 80%, is chosen. This means that 80% of the time the experiment will detect a difference between the control and experimental groups if a difference actually exists.
Estimate the effect size. Generally, a moderate to large effect size of 0.5 or greater is acceptable for clinical research. This means that the difference resulting from the manipulation, or treatment, would account for about one half of a standard deviation in the outcome.
Organize your existing data. With the values for the three factors available, refer to the table in your statistician's manual or textbook; or enter the three values into an online calculator made for determining sample size.
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Given with a calculated biomass potential energy, how can you calculate the Electricity Generation Potential in Giga Watt Hours (GWh) based on the Net Efficiency of the technology used for power generation (Steam engines: 10%; Gasifier + IC engine: 18%) and the total capacity of power generation in Mega Watts (MW) by taking a Load Factor of 50%.
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1 PJ is 277.78 GWh
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I am interested in some remarks regarding power generation from low-temperature resources, yet no up-to-date papers are available. Had you any information - I would be grateful for sharing.
best regards
Bartek
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Chena Hot Springs Resort uses two 200kW Organic Rankine Cycle (ORC) geothermal energy power plants to generate energy, the first in Alaska. The resort moved the diesel generators used in the past to a backup role since July 2006, and it is successful in reducing the cost from 30 cents/kWh to 5 cents/kWh. The resort owners have plans to increase the powerplant's work output from 200 kW to 1MW. An increase to 730 kilowatts was accomplished.
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Recent researches have proved the improvement of power generation of Solar PV systems with water cooling mechanism. What can be the practical obstacles for this ...
What are the negative impacts of water-vaporizing solution ?
Is it cost effective ?
Thank you
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there are some practical solutions in germany. The main problem in our expirience is the vapor phase in using, regulation and safety control. This could be one point for some problems.
Best Regards
Torsten
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Can the current and voltage generated by the piezoelectric vibratory energy harvester be measured experimentally?In other words, can we measure the power generated by the piezoelectric vibration energy collector ?
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There are two options:
1. (Easier) Measure the voltage of a resistor placed into the piezoelectric eletrical terminals. Then, you have the value of the resistor and the measured voltage. Thus, it is possible to calculate the current by I=V/R.
2. (Harder but more comprehensive) Connect a frequency analyzer equipment into the terminals of the piezoelectric device. Then, it is possible to extract the frequency response (gain as function of frequency). Usually, frequency analyzers can provide voltage gain as function of frequency. You can also use a resistor as load in this case.
I hope this helps
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Colleagues, good afternoon! I was wondering what problem is the most urgent at the moment in the operation, design of gas turbines and combined cycle plants. Influence of gas turbines on the steam circuit, power reduction during summer power limitations. maybe the quality of fuel and self-contained liquids?volume_upcontent_copysharestar_border
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As the penetration of grid-connected solar energy increases, is it technically possible to replace most of the conventional power generations including coal, gas and natural gas in modern power grid? Is there any critical technical challenges we need to overcome? There are various researches ongoing such as virtual inertial (VI)-based inverter, maximum power point tracking (MPPT) and hybrid energy storage system (ESS) to address voltage/frequency instability, IV & PV non-lineality and solar energy non-availability during night time respectively.
Plus, there are many technologies like artificial intelligence (AI), smart grid, blockchain and other advanced terminologies available for solar energy. From these perspectives, will the solar energy eventually replaces conventional power generation or it will be limited as a supplementary energy source for existing power system which is ideal for remote and vast area?
Welcome to exchange your valuable perspectives on the future of solar energy.
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Please see my road map for the transformation from conventional to PV generation in the paper at the link:
Best wishes
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I need to do short term forecasting of demand and generation of microgrid. I need real-time data of a microgrid consisting of historical and weather data on demand and generation. Thanks in advance for your responses.
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I'm trying to simulate a power generation cycle by adsorption / desorption of ammonia in salt / metal (SrCl2..MnCl2) in a bed. Does anyone know that can i use aspen adsorption or not?
i means it is possible to define the specific reaction between ammonia and for example SrCl2?
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You can easily interconnect/link Aspen Adsorption software with Aspen plus
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I'm a graduate student at McMaster University. Now, I'm doing a system optimization project. I'm interested in optimizing the energy storage system applied to Wolfe Island Windfarm. I'd like to make sure where I can obtain the exact power generated by the wind farm in each hour during the whole year. Also, I need the hourly power prediction (power commitment) data for the next hour.
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If you have more than one source of power generation, how to select the operating one and exclude another? What is the common technique for optimizing the power source? Is there a technique like this?
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ED - Economic Dispatch
UC - Unit Commitment
OPF - Optimal Power Flow
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This discussion aims to show how the world's investment in power generation is. In Brazil, the current investment is made more in photovoltaic and wind power.
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In Ecuador, the fossil energy source is widely used, because this is an oil exporting country. On the other hand, the most widely used renewable source of energy is hydroelectric, because the mountainous regions of Ecuador have favorable conditions for this energetic practice.
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With the trend of replacing fossil-fueled cars by electric vehicles, how much of the increase in electric power generation will be required to replace 1.2 billion existing cars, disregarding trucks and motorcycles in the coming years?
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Biofuels require crop land and water that would be better used for food production and also encourage monoculture. Not the best alternative. I have high hopes for eventual space-based solar power:
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Hello, everyone. Anyone know how to set power generated by the synchronous generator in PSCAD? I tried many ways, but don't understand what determines the limit of generated power.
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Hello, Alisher, your best bet in controlling the power generated is your phase angle and the terminal voltage. That's how I does mine. Go to the generator initial settings, input your terminal voltage in pu, and also the phase angle in rad or degree.
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Hi all,
I am looking for a source to download wind power generation data. The data should fulfill the following requirements:
- measured (not simulated) power generation
- of an individual wind turbine or farm (not country-level or TSO-level data)
- in hourly (or at least daily) resolution
- that spans at least one month (better multiple years)
- that is downloadable (I don't want to see the data, I want to use it)
- free of charge (for academic use)
The geographical scope is open but European data would be optimal. So far, I checked the following sources:
- https://www.energy-charts.de has data for two parks in Germany but I do not see a way to download it
- https://transparency.entsoe.eu has some data but one can only download one day at a time
- https://www.bmreports.com has detailed data for UK but again, downloads are only possible for one day at a time
Alternatively, recommendations for a Python library that can retrieve this kind of data are welcome (specialized libraries - not general web scraping libraries like Selenium, BeautifulSoup, etc.).
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Hello, I'm studying the potential of the renewable resources in power generation and I was wondering how can I calculate levelized cost of energy (LCOE)?
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Hope this helps,
sLCOE = {(overnight capital cost * capital recovery factor + fixed O&M cost )/(8760 * capacity factor)} + (fuel cost * heat rate) + variable O&M cost.
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I want to use Concentrating solar cell developed by Spectro lab, USA and wish sole guidelines for the same. Is it possible to store the power generated by these cells be stored by any type of batteries? which is the most suitable battery for this cell?
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Which type of following Indoor Noise Pollutants affect you the most?
o TV (Television)
o Air Cooler / Air Conditioners
o Power Generators
o Different home appliances
o Family conflict
o Refrigerators
Any other, please mention.
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Usually the TV, kitchen appliances and AC are the most common reasons for the in -house noises
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I'm currently using Nafion 211 for the proton exchange membrane in my microbial fuel cell experiment. I found lots of articles recommended to use Nafion 117 instead. My experiment was failed, there was no power generated by the fuel cell and I suspect the Nafion 211 can not facilitate the proton exchange in the MFC.
I'm wondering what the difference between 117 and 211 is and could Nafion 211 use for MFC?
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The thickness is difference, 117 is 7x more thicker. Thickness is 1 mil for 211 and 7 mil for 117: https://www.nafion.com/en/products/sulfonic-membranes
And 11 and 21 is Equivalent Weight - fraction between weight of dry membrane and number of sulfuric groups.
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I have data on power generation and other variables (e.g Irradiance, temp & wind speed) of last two years(on daily basis). I want to forecast the power generation using SVR so I need its MATLAB code which is easy to understand.
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Dear Mohammed,
Check the following link for the SVM Matlab toolbox.
It is easy to use.
Kind regards
Qin
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I am looking forward to work on System Modeling and Control theory in Power generation, Aerospace or in Robotics. This is a completely new field for me and i need to do a lot to build the foundation stronger to carry out innovative research. Currently, i am reading books to understand relevant concepts as well as i am reading latest research papers to be familiar with new research in the field. Unfortunately, i am still clueless about this new field.
I need some expert advises from experts in this field that how can i master the concepts and bring the concepts into something which is called innovation.
Looking forward to get the brief answers from you guys.
Thanks
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Dear Muhammad,
The more promising and externally challenging future for robotics in nuclear power plant (NPP). The key rationale of robotics application has always been to avoid human exposure to hazardous environments and tasks ranging from scrutiny and general maintenance to decontamination and post accidental activities. To execute these activities, robots need to incorporate artificial intelligence, improved sensors capability, enhanced data fusion and compliant human like leg and hand structures for efficient motions. Next generation robotic systems in NPPs are expected to work in full autonomous mode in contrast to the current semi-autonomous scenarios. Far future systems could deploy humanoid robots as well. This paper presents state-of-the-art of robotics developed for NPPs, associated challenges and finally comments on future directions.
Key challenges and future:
The primary challenge of robots in NPPs is to ensure safety with precision, reliability and repeatability for any kind of operation in any state at any time under any circumstances. This challenge is due to technological limitations in terms of on-board processing speed, power requirements and unavailability of integrated sensors and actuators, initial robotic systems were highly task specific with little intelligence. The robots were almost unable to cope with any other scenario for which they were not designed. The robotic units were designed with stationary bases and with specific and limited work space. To make use of nuclear power for the benefit of human being in a risk-free and undisruptive manner is another challenge. To achieve this status, in addition to development of superior state-of-art technology, we need to devise better plans and systems to cater for cataclysmic circumstances. Reactor with cooling towers is the most sensitive part of a NPP. Radiation danger in these parts imposes special attentions for all kind of operations in this region and thus this is probably the most desired area of deployment and use of intelligent robotic systems. The challenges in this particular region are coped using various existing branches of robotic units such as mobile robots, stationary industrial arm manipulators or hybrid robots.
System Model:
Simulators and computer modeling techniques are strongly recommended by the International Atomic Energy Agency (IAEA).Here the scopes are dynamic model study of sensitive region reactor with cooling tower. Re-designed robot model efficiency studies with an addition of an extendable arm studies using appropriate payload capacity, environmental hardening, sealed mechanisms and wide range of tools.
Hope it help you out. You would like my explanation.
Ashish
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Synchronous generators are rated in MVA where as when we refer to a power plant we refer to their MW rating? Why is this so?
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In addition, MVA with a rated voltage of operation in kV, gives a direct indication of ampere based on which conductors are to be designed.
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Renewable utility-scale power generation, such as wind, solar, etc, has become much cost-effective and more and more important in the past few years. However, the lower energy transition efficiency and the periodic generating feature constrains the development of renewable energy. These years, energy storage has become a hot research topic. My questions are: Is energy storage really the solution of future energy? If the answer is yes, which kind of energy storage will be the best available technology or the most promising technology for utility-scale power generation? Are there any technical issues that constrain the application of energy storage technologies? When will energy storage technologies become widely applicable?
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In addition to the batteries and super capacitors there is hydrogen. Hydrogen can be obtained using water elecrtolyzers. The hydrogen can be stored and converted back to electricity using the fuel cells. This can be made with the efficiency of charging and discharging batteries. In Germany they make an appreciable advancements in hydrogen technology.
Hydrogen has several advantages as an energy carrier and fuel. It is easy to store, to transport and can substitute the fossil fuels.
Best wishes
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There are more number of power generation plants like steam, hydroelectric, nuclear, biomass, solar etc. The supply of power from these plants depends on the utilization. Each plant has some advantages and disadvantages for power generation. In this context, what could be the preferred power generation plant?
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This paper will help you answer your question. I hope you find it useful.
Title: Least cost generation expansion planning with solar power plant
using Differential Evolution algorithm.
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OPF; sensitivity analysis
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Thank you for your valuable replies. But would like to know, to what extent the parametric values may be changed for a metaheuristic for SA? Is there any definite rule?
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In Digsilent software,why are the values of current(pu) in a bus connected to this equipment different, when the "Nominal Apparent Power" in generator specifications and the "Rated Power" in transformer specifications are not equal?
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Thanks Dr.
I import and simulate the file sent me; but i have problem in simulation.
when i choose "Nominal Apparent Power" in generator specifications and "Rated Power" in transformer specifications equal of together, per unit currents will be equal.
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What is the benefit of using a physical model to model the power generation (i.el solar field with parabolic trough collectors)? A data-driven method could potentially achieve similar accuracy with massive training data?
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All physical models are based on the laws of physics and especially on thermodynamics. They are mostly used for design calculations. The benefit is, that you only need input data, no output data.
All empirical models are based on experimental results. The influencing parameters on the results are then weighted with different coefficients and incorporated into the solution algorithm as a mathematical equation. The coefficients are then adapted so that the calculation result matches the sea values. You need input and output data.
However, there are also the combinations of both models. E.g. in the partial load case mostly corresponding efficiency characteristics or characteristic arrays are used. The same applies to the fouling of heat exchangers. The extent of contamination cannot be measured, only the result, so that the overall heat transfer coefficient is supplemented by the fouling parameter.
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Hi Geoff, i'm interested in co-firing a brown coal power power plant with paper/packaging etc waste to yield bass load energy and biochar for agriculture. little/No CO2 emissions..any thoughts?...it be sub optimal power generation looking to strike a balance. Have you got time to chat
Me thinks you'd be the expert here
cheers
Richard
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Thanks Geoff (and others)
what if pulp/paper/packaging materials were pyrolysed with post-coal fired power station furnace gases to produce bio-char and other pyrolysis products?...i.e. the flue gases might provide a low oxygen input feed of some sort for an 'after burner'...might need to inject a [fair] bit of H2 too maybe?
...my goal here would be to use these power stations to actually reduce concentration of CO2 in air. ...and produce some C products ...biofuels, syngas and biochar ...any power production would be a bonus...Am i dreaming?...
cheers
Rich
PS: anyone know of a good industrial or pilot scale example of something like this
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Hello everyone.
I am trying to solve this problem where i need to calculate the optimum capacity of PGU in combined cooling heating system (CCHP) using Genetic algorithm.
I have these equations:
The natural gas consumption by the PGU with respect to time can be expressed using the following equation:
Fpgu_t = Epgu_t/ηpgu_t .........(1)
where Fpgu is the natural gas consumed by the PGU.
The efficiency of PGU which is ηpgu, can be calculated as follows:
ηpgu_t = a+bf_t+cf_t^2..............(2)
where a, b, and c are the constant coefficients, and f_t is the partial load rate with respect to time which is the ratio of electricity generated by the PGU to the maximum output (PGU capacity) and can be defined as:
f_t = Epgu_t/(Ecap)...........(3)
A common linear relationship exists between the gas consumption and electricity generated by the PGU , which is widely used to optimize the CCHP systems and is expressed as follows:
Fpgu_t = α×Epgu_t+β........(4)
here i have the values of a,b and c for equation 2 and α and β for equation 4. Also i have common linear relation between the fuel consumption (Fpgu_t )and electricity generated by PGU (Epgu_t) which i have attached.
Other than that i also have a load profile which will be used to calculate the optimum capacity of PGU.
Please anyone can help me with that? I have consulted many different journal papers but i am still very much confused in this part.
Please help. Thanks everyone.
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It's my pleasure, Taimoor Mohsin . I'm sure open for further scientific discussions in the future. I wish you all the best in your research!
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I really need calculations on steam electric power generator
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This is good to f calculate the efficiency of electric power generator efficiency. There are time is continuous variable which affects the efficiency. So many paper on O.T have discussion on the efficiency
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Dear fellow researchers,
is there anyone who has access to, or who can provide me with a good reference of, curves that can provide me with quantitative information about how the electric and thermal power generated by a Solid Oxide Fuel Cell in combined heat and power mode vary with the load of the fuel cell system?
To be more specific, what I would need are curves of the type:
electrical efficiency vs SOFC load
exhaust temperature vs SOFC load
exhaust mass flow vs SOFC load.
I am trying to test the potential use of an SOFC for transportation purposes, and it would be very helpful to have access to this type of information
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The difference between Diesel engine and SOFC is that Diesel engines have been commercialised for a long time. SOFC are still in development.
Best regards
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Currently, I am selecting a power generator for Dielectric barrier discharge (DBD) reactor. I am wondering between 02 devices: AC sinusoidal power generator or Pulse power generator. Which power supply device provides the best performance on the DBD reactor? And in accordance with the method of calculating discharge power DBD using V-Q curve Lissajous (Because I currently have high voltage probes 1000x and monitor capacitors. I don't want to use the high current probe to calculate the discharge power for some reason I don't have this device right now)
If I want to change both voltage V and frequency F for DBD reactor, I need to choose which power supply device. Please suggest me some specific power generator supplies.
I sincerely thank you and wish all the best!
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Utilization of solar energy is always one of the meaningful research areas. But most researches are about one or two utilization aspects, such as for cooling, heating, heat storage, power generation, water uptaking, and so on. Is there any completed or ongoing research about the integrated utilization of solar energy to combine all these applications into one whole system?
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It is not that wise to to combine all these applications into one whole system. Flexibility brings the opportunity, together with challenge and limitation. Think about that the solar heat could fully realize one technology but it cannot be used for the similar amount output by using other applications at the same time. Also the demands should be considered at the very beginning. If no heat and cooling demand, electricity could be a solution.
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Greetings,
I need for a simple document ( Paper ) explains the calculations of wind energy power generation..
Thanks
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I a simplified taught-course about wind power generation, it is important lecturer to signify that, based on the equation of power calculation: P = ½CAρv3 , the synergistic role of wind velocity is much more important (as power of "3"), than that of the other variables: "C" power coefficient, "A" the swept area, and, "ρ" the density of the air (all as power of "1"). Based on this notation, It can be also stressed out that even all other variables, C A ρ, are fairly satisfactory, wind power plants/generators cannot be installed at remote areas/sites where annual average wind velocity is lower than a certain value (commonly lower than 7 m/s).
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Now new term waste to Energy is getting heat in India. So want more information, how this Waste to Energy termed as Plasma Technology can help society to reduce risk of solid waste and develop with this new technology?
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In this technology waste materials from the society are used for power generation. This is a clean energy. This process is beneficial as it helps in making environment pollution free. For detail you can go through the following reference, which will be helpful.
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I have data on wind speeds stretching over 5 years. I want to use it to estimate average annual power generation capacity of a 5kW wind turbine.
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Thank you Ahmed Abdelhameed . The article is very helpful, thank you for making the text available so easily
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In February 2018, Trinidad and Tobago signed on to the Paris Climate Change Agreement.
The Ministry of Planning and Development has indicated that "Trinidad and Tobago is committed to conditionally reduce its cumulative carbon emissions by 15% in the power generation, transport and industrialised sectors by 2030".
What initiatives are underway to meet this commitment?
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Create carbon sinks through aggressive aforestation programmes. Reduce emission of GHGs through legislation and advocacy.
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I have a hard form of the book with me. I am looking to have a .pdf version of it. Please share any link where I can have it.
Thank you
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Hi Ahmad. Please give me your e-mail.
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Hi All
How exactly is the air or wet cooled condenser sized and controlled in a power plant?
For example, for a wet cooled condenser, is the design/nominal exhaust turbine pressure calculated based on the 1- max wet bulb temperature experienced onsite 2- average wet bulb temperature 3- or average max?
Also, while the plant is operating, say one day the wet bulb temperature was higher than the design value, do plant operators simply increase the cooling water flow rate to ensure the exhaust pressure is fixed or let the turbine exhaust pressure increase which would slightly hurt its power generation?
In other words, do we size and/or control the condenser such that the turbine exhaust pressure is fixed or the exhaust pressure is allowed to float based on weather conditions?
Thank you all
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The cooling water or cooling air determine the temperature and pressure of the condenser. The volumetric flow rate at that temperature and pressure determine the size.
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Let's talk about Dose of plasma!
How can we measurment it(in J.cm^-2)?
The energy that we talk about is plasma energy & it related to power of generator?
or we can use the light fiber or ICCD to take spectrum and then compute the energy of the gas(for example argon)?
Is the energy same as radiant exposure?
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So deduction:
For calculate W/cm2 we can measure cross section of the plasma bullet, then you measured output power of power supply
For J/ cm^2 the question is :"What's the energy?" Is it plasma's energy that we can calculate with the energy distribution function equation? So it's hard!!
I think another way is this: " We can assume that plasma is capacitor! So we can calculate the energy that stored by capacitor! We should have, output voltage and electrical charge of the electron!! So we should calculate the number of particles with velocity of Vx, Vy & Vz(we can find it with spectroscopy) & measure plasma temperature too(we should accuracy that we have cold plasma and temperature of ions can determinative the plasma temperature) ! Then we should find the product of two parameter(The number of particles and electron charge)
Am I right at all?
If I'm wrong, please let me know!
I think that i need discussion to understand the theory & experimental of this subject!!
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Many presidents in the Middle East in general and the Arab world in particular, assume power in general elections. But later on, they become dictators and remain in power for tens of years. They even change the terms and items of the constitution for their interests to remain ruling the country as if they are the only ones qualified to be presidents. Your comments are highly appreciated.
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Good discussion... Following
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Need of a wind energy data-set depending on features like generation amount ,climatic & weather condition,speed of wind etc.
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n 2016, the total installed wind power capacity increased to 54.6 GW (compared with more than 60 GW in 2015) to reach a total of 486.8 GW at the end of 2016. Wind power generation in 2016 was evaluated for 2015, according to the sources , from 3% of global electricity production, ie 841 TWh, to 4% of world electricity production, ie 950 TWh.
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Hello dear scholars,
in the context of the hydropower generation, what is the limit of power generation?
Should I see it limited by the nominal capacity of generators, from above?
Because, I see that in the Turbine Hill-Chart, and its safe operation region, it can produce way more than nominal capacity of the generators of the power plant.
let me know if I could not express my question, clear enough.
Thank you
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Hydro power plants work as peak load supplier. It means these plants regulate deficit power required to maintain power balance and system frequency. Therefore, power output of the units are anything within their minimum generation level to the maximum generation level. Also, some times such plants are used as base load supplier in which units operate at their maximum power limit. As the cost of fuel (water) is freely available, so, it is always advantageous to use as more hydro power as possible. However, water must to available with sufficient head to continue to rotate the turbine.
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Am investing the wind and wave activities over the Atlantic with view of ascertaining areas suitable for power generation. What are those factors I should consider?
You can also share with me relevants and helpful materials.
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ok
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Im doing research on temperature rise in solar cell during open circuit condition or partially loaded. Im sure that when solar cell is in open circuit the energy generated will be transferred as heat and the same will cause degradation of solar cells. Can you help me out with formula or methodology to find the rise in temperature when power generated in solar cells are unused? How long it will take to cool the developed temperature?
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The equations given by me are the same expressed by the the heat transfer equivalent circuit of the module given by Vladimir in his second comment. Also i gave an expression for heat transferred from the surface pf the panel mostly by radiation.
You can calculate the steady sate temperature of the module and you can also calculate the variation of the panel temperature with time.
The interesting thing here is that you can use the SPICE circuit simulator to solve for delta T of the module.
Best wishes
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We use solar pannel in roof top system for electrical power generation. I wants to know the size that panels.
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Length and Width – Although length and width varies slightly, most companies are manufacturing solar panels in standard sizes. The most typical size used for residential installations is 65 inches by 39 inches, while the common size for commercial applications is 77 inches by 39 inches.
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I'm currently working on a design of a hydroelectric system that can be free of environmental and economic concerns and reliable to operate in Ocean and Sea.
It is a huge project In planning. If you are an expert or have experience in this area, I would greatly appreciate your support to make this project happen.
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If you really want a powerful sea based hydroelectric plant, go to the Australian town of Broome and take a ride up the coast, which is (1) dotted with islands, (2) has only a slightly inclined sea bed and (3) has very high tides, You get the phenomenon of the 'horizontal waterfall' as the water rushes between the islands at speeds of tens of kph at times and is absolutely reliable all year round; it would give gigawatts, and maybe terawatts of power if fully tapped. Problem is, its absolutely nowhere near any place that requires such colossal levels of power. There was talk in the early 2000s of using it to electrolyse hydrogen and selling it to the US or China or somewhere - but the investment would have been enormous and the market in those days for hydrogen was tiny. It still isn't great)
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How do we calculate the voltage dip of a DG Set during the starting of the largest KW motor.?
What are the factors which effects the Vdip value.
Any relevant Standard which can be refereed preferably IEC/IEEE?
Once such formula for calculation the Vdip, I came across was
DG KVA raing required during Starting=1.1 * ((1 - Vdip) / Vdip) *( (Xd' + Xd') /2 )*starting KVA of Largest Motor
where,
Vdip- Voltage Drop during starting of largest motor (here Vdip is considered as 15% )
Xd' - Transient Reactance of the DG
Xd"- Sub Transient Reactance of the DG
Is there any relevant standard for the above formula.
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Dear Khalid,
I ask the same question that Voltage Dip Calculation for DG Sizing?
are you get any informations?
@ Khalid Jamal Shahid Khan
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I want to find paradigs which have been governing power generation during the history of this industry. For example, when country-coverning grids were replaced by local power stations and why?
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There are factors affecting the choice of a system configuration among the many possible ones.
Among these factors are:
-The demand
- the approved technology
- The availability and the reliability
- The system efficiency
- The system cost
- The effect on the environment
- Safety and controlability
- Ease of logistics
I think the power system as it exists today has been evolved to continuously improve the system performance among the time.
The system relies on large power stations, efficient transmission network based on high voltage transport and low voltage distribution network to satisfy the customers need.
Best wishes
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there are many ways to model the stochastic behavior of PV generation. however, for multiple solar DERs in a power system these random variable could be correlated. this is mostly due to the impact of intermittent weather condition . what is eh best method to model these correlation?
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I have created several simulated cloud cover animations for solar fields based on field measurements, such as http://dudleybenton.altervista.org/miscellaneous/simulated_clouds_over_solar_field.gif I also have several Monte Carlo simulations, implemented as Excel spreadsheets and in C. You will find a discussion of variability and uncertainty in this paper: http://dudleybenton.altervista.org/publications/Total%20Solar%20Field%20DNI%20Measurment%20Method%20for%20ASME%20PTC%2052.pdf I have done a lot of work with atmospheric data. It has been clearly demonstrated that random atmospheric data doesn't approximate actual data because the variables are linked through physical processes. It is possible to accurately approximate real conditions, but you must be careful to preserve the relationships between the variables, which you can deduce from historical data.
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Can experts working in gas turbine industry/academia explain about the key challenges to the future of gas turbine-based power generation?
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Nox, Efficiency increasing via TIT and CPD, avoiding unavoidable off-design degrating, Realable a fast dynamic models, accurate, robust and fast controller respond, hot section material improving, flexibility in load and frequency control, and so on... It is depenedent on your research line.
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I need a low to medium cost setup to measure solar energy over a long period to evaluate a site for installing small solar or hybrid power generation systems.
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Dear respected Irfan Ullah,
The equipments needed to measure solar energy at a site to be able to predict the output of solar panels are:
1. Pyranometer 2. Thermometer 3. Multimeter 4. Resistors 7. pyrheliometer
Best regards.
Kifilideen
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We are considering installing 30 MW SPV power generation facility, connected to 11 kV power grid. Th e system is required to supply energy upto 5 MWh during six to seven hours after sun-set per day. We are exploring practical options for neat and clean storage of electricity at the site. The site has more than 300 sunny days in a year. It is desired that system will be operated such that the battery bank will be charged on priority during the day, and excess power will be supplied to grid at the site.
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One viable concept is to integrate the the SPV with an electrolyzer and PEM fuel cell stack. The electrolyzer will convert the surplus electricity to hydrogen gas which can be stored as compressed gas in storage tanks. This stored hydrogen can then delivered (as a feedstock) to the PEM fuel stack to generate electricity on demand.
Hope this helps answer your question and good luck with your project.
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I know its very basic but I have data available for Solar Power Generation from Panels but they are in Watts. Available data is in 15 mins interval. While consumption data available is in Watt hours.
Here is the problem: Generation and consumption data are from different meters hence both have different resolution (timestamps) i wanted to plot these two parameters on same graph but due to difference in resolution i cannot convert Solar power into Watt hours.
How would i convert Solar power into energy (Wh) accurately?
Help would be appreciated. Thanks
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Dear Mahmood,
Following the discussion it became evident that your problem was solved by the answers of the colleagues.
But i want to stress that the kwh is an energy unit and the kw or watt is a power unit. The relation is simply:
kwh= integral of the power p in watts over the intended time interval Tdivided by 3600. If the power p is constant with time or if it is an average value pav and the time period is T in seconds, then
kwh= pav T/3600.
Conversely
Pav in watt per second = kwh x3600/ T in seconds.
These are the two relations which you need.
As for calculating the demand and sizing the PV systems you use what is called the load profile which is a graph showing the power of every load and its time duration.
For more information please see the course in the link:
Best wishes
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coil wound alternators are used everywhere to Generate electric power in all  kind generating stations.Though it is demonstrated by vande graf (static generator)  it is is not popular  in power generation. Let me know the limitations and constraints if any
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Some of the answers posted here so far have, I think, rather missed the point; but then, so did the question. The salient point is that the 'opposite' of 'magnetic' is not 'electrostatic' but simply 'electric'. Forget the term 'electrostatic', as that is just misleading. Conventional so-called electrostatic generators are designed to generate high voltages (for 'static electricity') rather than power. If we want to generate power then we simply look to the electric analogue of a magnetic power generator. As I will demonstrate, electric machines are theoretically much better at generating power than magnetic machines; but there are good reasons why they have not caught on.
Consider, first, how a generator works using magnetic induction. A moving magnet (relatively speaking) causes a time-varying magnetic field which generates a voltage in a loop of wire. If you complete the circuit to allow a current to flow, you dissipate energy and this arises because of the energy required to move the magnet against the field induced in the loop. A magnet is manufactured by allowing a material to 'solidify' in an area of high magnetic flux, so that the magnetic domains are 'frozen' in place.
A magnet is, more formally, a ferromagnetic material. Now consider the electric equivalent of a magnet, which is a ferro-electric material, also known as an electret.
A moving electret causes a time-varying electric field which generates a current in a wire/plate. If you complete the circuit to allow a potential to build up, you dissipate energy and this arises because of the energy required to move the electret against the field induced in the wire/plate. An electret is manufactured by allowing a material to 'solidify' in an area of high electric flux, so that the electric domains are 'frozen' in place.
The analogy is interesting, yes?!
Although 'magnetic induction' is the more familiar phenomenon, you will probably have done physics experiments at school with 'electric induction' using an electrophorus, which is a device for transferring electric charge from a reservoir. One of the key points in those physics lessons was to get the pupil to explain why it apparently allows you to transfer charge indefinitely, i.e. where does all the charge come from? That’s a very clever question, and it baffles most students, but it is only like asking why a magnet lasts 'for ever'.
Now, the energy storage density of a magnet is simply ½ B.H which, for a NdFeB magnet with a relative permeability of about 1 and a saturation flux density of (say) 1.3 T [Tesla, equal to As/m^2], gives about 0.8 MJ/m^3. The energy storage density of an electret is, similarly, ½ D.E which, for barium titanate, with a relative permeability of about 200 and a saturation flux density of 0.16 Vs/m^2 [that unit has no common name, unlike the magnetic analogy], gives about 7 MJ/m^3.
So you can see that – contrary to what others have said - an electric generator could be ten times better than a magnetic generator for the same volume of active material. So why do we not use electric generators?
Well, of course, they are used. For very small devices (not necessarily "nano" but just "micro" or "milli" devices) they work much better than a magnetic generator because they do not require a bulky copper coil to be added to the assembly.
However, for larger devices there are a number of engineering reasons why they are not used. To achieve the theoretical maximum flux density in an electret requires a very high electric field strength and, due to the breakdown voltage of the material, this limits it to a thickness of perhaps 1mm - so large devices are not practical. There are several other reasons, including those of cost, and of 'historical investment' by which I mean that there is a large body of knowledge on magnetic generators and no real incentive to find an alternative – except for specialised and very small devices.
Hope this helps!
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  • It was developed almost 20 years ago for hydrogen storage to be used in power generation.
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checkout this link:
Article The cycle stability of Mg-based nanostructured materials
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I am aware of the droop control but i cannot figure out how to implement this in MATLAB. I find papers about the droop control in case of distributed generation units which are connected to the grid by means of an inverter. Here, you can decouple the active and reactive power, generate the reference voltage accordingly and control the power sharing according to the droop control principle. This is no possible in case of synchronous generators where you can change the input power (governor control) and field excitation (excitation control).
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You have to control the power angle of one of the machines; for that the frequency has to change temporarily, either increase or decrease for the power angle to change. Once reached the desired power the frequency goes back to its nominal value. So, the controlled variable is the power angle.
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Please, I kindly would like to know if it is better to use predictions and measurements for the control of hybrid systems using EMS ? In case of only using measurements of the generated powers and generating the control signals, does the controller gives good results?
Thanks in advance !!
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Thanks !!!
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For an undergraduate level course, I need a simple tool for solving optimal economic dispatch (OED), and combined optimal economic and emissions dispach (CEED) based on classical optimization methods. Offline (i.e. without the need of Internet) tools are preferable.
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Here the top 5 MySQL GUI Tools for Windows are:
HeidiSQL, dbForge Studio for MySQL, Navicat for MySQL, MySQL Workbench, SQLyog
Features:
Great and easy to use UI. Very comprehensive and intuitive interface.
Free to use – Licensed under GNU GPL
Portable version is available for download, so you can use it without the need for administrator privileges and any installation.
Full database user management and privileges management options.
Automate connections via command line utility.
Ability to connect to MySQL database via an SSH tunnel, in case you don’t have the default port open for remote connections.
Good syntax completion.
Can work on Linux if ran with the Wine platform.
Professor Yehia Khalil, Yale University, USA
Fellow of the University of Oxford, UK
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Since the time of Independence India has been deriving its electricity from coal, Hydro and thermal based power plants. the efficiency of power plants and there output is an important aspect, after certain time period it starts to decline.
My query is, does India has some policy to regulate and replace these old power plants and to setup new efficient plants that can fulfill the energy needs. Under what policy these plants are replaced and what is the time duration. Where does the technology for this power plants in India are made is it licensed from other countries or manufactured through joint ventures.
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Here are the sources of power generation in India as of January 2018:
Coal: 193,821.5 MW (58.0%)
Large Hydro: 44,963.42 MW (13.4%)
Small Hydro: 4,418.15 MW (1.3%)
Wind Power: 32,848.46 MW (9.8%)
Solar Power: 17,052.41 MW (5.1%)
Biomass: 8,527.88 MW (2.6%)
Nuclear: 6,780 MW (2.0%)
Natural Gas: 25,150.38 MW (7.5%)
Here is a useful URL for the power generation in India:
Professor Yehia Khalil, Yale University, USA
Fellow of the University of Oxford, UK
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To get active power of the generator to zero but reactive power should be injected to the system for voltage stability.
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Yes, operating synchronous generators as condensers is a popular modes. The net active power flow (direction and value) depends on the relative phase angle between the machine's internal emf, and the interface bus to the rest of the system. Adjusting the relative phase angle to zero, results in zero power exchange between the generator and the system. On the other hand, the reactive power flow (direction and value) depends on the relative difference between the magnitudes of the internal emf of the generator and the interface bus. The attached figure is helpful, and also Appendix 1 of the following book.
There are also some other educational sources available at http://shimymb.tripod,com