Questions related to Grid Integration
I'm looking for help in COMSOL Multiphysics modeling of VRFB for integrating with grid using Livelink in MATLAB Simulink environment.
Generic schematic is shown below for understanding.
Answer to the aforesaid question is requested from the experts, while considering the power flow equation i.e P = [Vs*Vr*Sin(theeta)]/X
Kindly suggest some upcoming research areas/ challenges to explore in (but not limited to) sustainable planning, and performance assessment of hybrid renewable grids.
The sources are PV and Grid. Equations i am applying right now is (1) Savings($) = ImportTariff * (ACLoad - Grid Import Energy) + Export Energy * ExportTariff
The second Equation is (2) Savings($) = System fee - (ExportEnergy * ExportTariff + Import * ImportTariff ). System fee is daily/monthly/weekly charging fee for system maintenance installations.
Moreover in some systems there are installed battery systems. Any new insights/feedback on equations would be appreciated.
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.
I have tuned the PI controller for the voltage control loop and inner control loop. But the problem is that it is not stable from a wide variation in the load/bus voltage. On the DC bus, there is a boost converter connected which is used to transfer power from renewable generation.
While Tuning considering rated load (separate/isolated) the operation is good. But on connecting it with DC Bus (microgrid) it is not working properly.
Is it possible to control the dq component of the three-phase grid-connected PV system using Proportional Resonant control?
My question is regarding the synchronous reference frame phase-locked loop (SRF-PLL), as discussed in the book "Doubly fed induction machines:Modelling and control for wind energy applications". The output of the integrator is taken to be the estimated value of the voltage space vector angle. In simulation, the default value of an integrator is zero; this means that the initial phase angle of the voltage space vector is always estimated to be zero, which may not be true. Does this mean that there is a deficiency with this kind of SRF-PLL? Otherwise, how should the estimator block be modified?
I have three questions about connecting onshore wind farms to substations:
1) I know, that larger onshore wind farms are connected to higher voltage levels (110 kV or 132 kV). But which voltage level would I choose, if I only have one wind turbine? does a rule of thumb exist depending of the wind turbine / farms capacity (MW)? A reference to cite would also be nice.
2) I have a wind farm which is already connected to a substation. Another wind farm is newly built and is nearer to the first wind farm than to the substation. Is it also possible to connect the wind farms, instead of the connecting line to the substation?
3) Do you have references for costs to connect wind farms to substations for UK? For example costs per km.
Thank you very much!
There are many codes for integration of renewable energy into grids. Nevertheless, the codes hardly discuss the transient response of grid connected generators and converters to maintain a power balance (equal input power and out power) in the DC link that connects the RE source to the grid under transient conditions. This is especially vital under a fault. The fault codes mainly focus on the system performance in an interval of tens to hundreds of msecs. However, It seems that there are needs for codes to govern the first few msecs of the system performance after a fault to maintain the balance and prevent the DC link over-voltage or over-current.
I was wondering why Bipolar switching make less EMI comparing to Unipolar switching in SPTG-CPV inverters?
According to a below article, the EMI and leakage current is very low as voltage to ground VPE has no switching frequency component, while only the grid frequency component is present.(see attached picture)
Could anyone add more detailed explanation ?
- Does it mean the grid frequency component is not categorized as noise components so its presence is okay?
- Why does VPE has no switching frequency ?
A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-ConnectedPhotovoltaic Systems by Kamran Zeb; Imran Khan; Waqar Uddin; Muhammad Adil Khan; P. Sathishkumar; Tiago Davi Curi Busarello; Iftikhar Ahmad; H. J. Kim
Energies, Vol 11, Iss 8, p 1968 (2018)
I am looking for some methods to estimate the loads in a power system at a transmission level which can be lumped to the individual sub-transmission buses.
High-penetration of renewable power generation throughout the network might increase transmission/distribution congestion. What are the effective tools in both transmission and distribution level for managing congestion due to renewable penetration?
Solar PV affect the system stability. It will exacerbate the situation when there is high penetration as well as when there is less penetration. How to measure the online parameter of the system so that we can calculate the affect of the penetration on the system stability?
What are the different ways we can counteract this problem?
Can forecasting of the data be a solution to the problem of stability?
Kindly help me with the parameter selection of the value of gains of the PR controller.
I am trying (1- Grid Import/Load Consumed)*100
the other way could be Load consumed - grid Import that would be battery consumed. so i could then draw a graph between grid import and consumed from battery. Please clarify.
China is building UHV transmission lines that supposedly will expedite renewable energy adoption by efficiently sending electricity from low population, high renewable potential areas to high population, low renewable potential areas. The US has a similar problem with renewable energy resources being in low population density areas. My question is:
How likely is it that UHV transmission lines will be built in America?
I just have a basic doubt regarding how the limits of various PI controllers used for the design of current control technique of the grid connected VSI is being selected.
I feel that applying limits to the PI controllers is a critical aspect, but I am not sure how the values is to be kept for simulation (I have attached the paper titled "Single- and Two-Stage Inverter-Based Grid-Connected Photo voltaic Power Plants With Ride-Through Capability Under Grid Faults" kindly refer to Fig. 4 of the paper and the line highlighted in green.)
Also find attached the snapshot of the Simulink model made by me in the page-2 of the second attachment titled "pid_simulink_limit"
Hi, I am working on PV system grid integration, for connecting the PV ssytem to teh grid through DSP, how to synchonize. I am using the TMS3200f28835 DSP kit, we are taking the grid voltage as a reference for syncronization
i need an example of xml file of a grid computing security policy or cloud computing security policy to analyse it where can i find and example , or how can i generate it ?
I have a grid of flow velocity measures, and the topographic survey of the cross section. I am trying to interpolate with matlab, but results are not satisfying. I have problems to delimit the cross section area within which to interpolate. Moreover, I don't know how to account for the velocity at the wetted perimeter...
actually for grid synch. process i want to implement these two methods. among these, for PLL i would like to go with [Vgrid TO V(alpha-beta) TO V(d-q). so can anyone explain the whole process thoroughly ?
My aim is to map PV plant locations to their respective transmission zones.
NREL has approximately 6,000 simulated PV plants over US. These data were used for transmission grid integration studies. In order to perform any simulation, these PV plants must be mapped to their respective transmission zones (as the first step). However, I am having trouble finding the corresponding shapefiles.
Does anyone know where can I get the transmission zone maps (in any computer readable format) for any iso, such as CAISO, NYISO, PJM, etc.
Just some clarifications: I understand that transmission line details are highly sensitive (which I do not need), but the zone maps (geographical boundaries) can be found easily on the internet. It is strange that the shapefiles are, in fact, hard to find.
The penetration of RE systems is increasing day by day. The implementation of net metering policies is encouraging the grid interconnection of RE systems at distribution level. But for weak distribution grids, is it possible to interconnect microgrids at single phase?
What are the significance of islanding in interconnected grid? How can it help to survive from grid collapse?
On connecting renewable energy sources (wind, PV etc) to electric power grids, it is necessary to estimate the grid angle at the point of common coupling so that power electronics converters can be provide decoupled control of active and reactive power. Several techniques are there to estimate the grid angle and frequency. These techniques are different in its speed of response, its accuracy, its ability to deal with harmonic distortion and mostly important their ability to support ride though operation during grid faults. The question is:
How can we establish a benchmark to assess and compare the performance of these different techniques ?
(to clarify the issue: For example in sensorless speed control of drives we can consider that a position and speed sensor can provide a benchmark data for assessing the accuracy of estimated position and speed)
In general what is efficiency(in %) of high power grid integrated system.Suppose, I generate 50kW from solar photovoltaic array and aim to transfer it to the grid using multilevel voltage source converters.How much losses are allowed in between?Is having efficiency in range of 90-95% acceptable?
Calculating dynamic pricing for energy (cost/kwh) for virtual power plant is my main focus now. The scenario is a system where the electricity market is liberalized and renewable energies (WT, Photovoltaic) are supplying a flexible load with a Gas Turbine (primary reserve).
Costs are sum of fixed, variable and operation cost. Finally the MCP is calculated according to how much energy the IPP will be generating the next half an hour. Thereby, I am calculating the Real Time Pricing every 30 minutes. But I have the following questions:
1. Solar doesn't produce power during nights, does the Solar IPP's make a loss during these periods? Or the calculation is already made excluding the non-solar hours for the project duration?
2. How does the producer make a profit/loss after unclear/bad forecasting (may be produces more than expected or ends up produces very less)?
3. What costs of Gas Turbine includes when it is not producing any energy but acting as a primary reserve (reserve costs)?
A healthy discussion is always appreciated and suggestions are welcome. Thank you.
I need the software to prepare models for grid integration of small and large scale renewable energy systems, as well as other energy models
Can a power generation plant be directly connected to transmission lines instead of installing new lines to feed the S/S?
I designed a front end converter for my grid integrated solar pv system. Things are working fine but there are even harmonics in my current waveforms (Grid side). What can be the reason.
I am designing the decoupled form of control mechanism for VSC (Inverter) in grid connected solar PV. I am unable to find the proper method of designing the same. What should be the criteria we should consider for designing the same.
Please suggest me for the same.
Normally, inverters with 110% of the rated power can produce as much as 46% of the reactive power. I am working on a grid connected PV system model with advanced inverter (VSI with SVPWM). Trying to model reactive current signal reference (Iqref) based on the grid voltage sag.
I have a grid data of shape (512, 512) and want to extract all the nearest pixels and their corresponding positions within some arcmin of a specific area of the data and regrid the small area using gaussian convolution.
This will help me to zoom that small area. Can someone show me how to do this in Python? Thanks in advance.
I"m using MATLAB/ SIMULINK to simulate the mathematical model of a wind turbine. The power output is 12 kw and the rated torque output is 440 Nm at 11m/s wind speed. I want to design a suitable Permanent Magnet Synchronous machine. I aim to interface the model with the grid. The wind turbine is a part of a Solar-Wind-Fuel Cell Hybrid system.
I have prepared a Solar-Wind-Fuel cell hybrid system in MATLAB/SIMULINK and also interfaced the hybrid system with the grid as part of my final year project. I want to extend the work to transient behaviour and stability of the grid with the integration of the renewable energy sources and suggested power quality solutions.
I want to connect some PCs together and form a grid. Using Globus is one option. I would like to hear about other options and also, what are the challenges in this work and, if it has a bright future in India.