Questions related to Power Systems Simulation
Comes under power system's Transient stability studies
CCT=Critical Clearing Time,
PSAT=Power System Analysis Toolbox,
TD=Time Domain simulation
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
I have done a PSS kundour Model using PSAT software and I want to find PSS's parameters using partrical swarm optimization. I done the partical swarm code but I want to know how to insert the PSAT model in partical swarm to find PSS parameters?
I want to to generate the power trace input file for HotSpot.
I am using Wattch power simulator. Wattch doesn't generate the power trace for directly.
can any one help me what changes required in wattch source code to generate ptrace file
So I have MVAsc rating given of an 132 KV grid which is connected to bus. The cable impedances are also given. The total load consumed is also given. How can I model 132 KV grid in PSSE? Can I do it with an equivalent generator? If yes how to estimate its capacity
I am working in the area of DC Microgrid in this regards I need a DC-DC converter. I will be thankful for this act of kindness.
Is it possible to simulate a line outage by simply removing a certain branch from the branch matrix of Matpower? What about the isolated bus resulting from the line outage? I tried simulating a line outage in Matpower by simply removing a branch from the branch matrix of Matpower and the load flow still converges.
Is there any code / package / script to automatically generate single-line diagrams from PYPOWER/MATPOWER casefile or IEEE CDF formats?
Actually I'm trying to generate wind direction and velocity using sentinel
But I'm having some problems.
After processing the imaging, using Sentinel 1 toolbox (SNAP), we have been
obtained this kind of image (see file attached). In this image appears
wind direction (with ambiguity) and velocity in m/s.
Where I tried to export these parameters those that are exported are in
the .txt file attached.
My questions is: 1 - How to extract the wind velocity from these image and
export it in as made in .txt file attached ?
2 - How eliminate the ambiguity in order to obtain the
Do you know anybody that is working in these theme using sentinel 1 data
in order to help me.
With my best regards,
I am working on HVDC VSC converters in DIgSILENT power factory. I have developed the grid and the DSL models of generators, controls and the VSC converters. But, when I run the simulation, it says something on inner-loop iteration reached for some models. I want to know how to resolve this error in DIgSILENT power factory. I have asked this question in the customer portal, but it didn't help me much. They suggested me what I already knew and have tried. I can send the pfd file if required.
I appreciate your help.
What is the process to carry out power simulation of any benchmark program using McPat simulator. How to get counter values need to be configured in xml file which is needs to be provided as input to simulator and how to get ptrace fie as output.
I have done a theoretical analysis to find out the rating power that need to be produced from PV panels depends on the datasheet given below at 7222W.
I have calculated the sizing design of PV arrays for 4 panels connected in series and 7 in parallel to get total at 28 panels at rate 120V and 60A that need to meet the demand.
Note Xsys=0.09 ohm at 25KA current fault level from IET datasheet.
the issue is how to implement this demand of power from the PV using matalb codes or simulink by demonstrates parallel and series connection of solar panels to get the rate at 120V and 60A?
the attached files shows schmatic of proposed system
Dear all ;
Am working on MINLP to minimize the total power losses of the network.
All the used equations were typed correctly.But when i run the GAMS code it gives this error : Infeasible solution. Reduced gradient less than tolerance?
I need assistance in that error ?
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
I am trying to model a system in PSS/e for transient stability studies. The network I am trying to model has a total demand of 1300 MW during peak season and it is interconnected to two other countries which have total capacity of 10 GW and 2 GW. I've short circuit MVA for the two interconnections, using which I've calculated the Zsource of the machines.
I've two questions:
1. Would I be using the short circuit MVA to represent the machine base or total capacity of the each machine for the studies?
2. Which generator and governor model to use to represent the inter-connection? Also, what would be the inertia (H) of the machine for transient stability studies?
Thanks for the help.
Does anyone know and can sent me a link for free software which can be used for thermal analysis of cable - ampacity and temperature computation around the cables in different environment (ground, water, air, concrete pipe.) I know that there are many commercial software from CDEGS, EATON-CYME..... but I need easy free software to eliminate manual computation.
Thanks in advance
I am trying to build a model for kundur two area system and do small signal stability analysis in simpowersystem .The state variables in simpowersystem are different from the kundur as simpwer system takes state as curent of inductor and capacitors. Any idea how to build state space as in kundur would be greatly appreciated
I am working on partitioning problem and want to show a novel algorithm for network partitioning based on complex network theory. I need this system high quality figure. I don`t have access to this figure. Any advice? Can anyone send me this figure?
I want to determine the interconnection damping and inertia constants for a real power system. If the detailed simulation of a power system exists in the power system simulation software such as DigSILENT, it can be useful to obtain these constants?
My project is to optimize the location of statcom to improve the voltage stability in a given system data using genetic algorithm.First i did a nrlf and later manually optimized the bus at which voltage is below rated value by integrating statcom into nrlf at that particular bus.Now i am trying to optimize it using genetic algorithm.Iam trying to use the 'optimtool' present in matlab to do this.For this i need to write the fitness function.I have a little idea on how to do it (as i am trying to maintain voltage stable then minimizing the deviation in it should come under the fitness function) but i am unable to relaize how to write it.So i would love it if any one can help me with this issue.Thank you in advance
How can we get the load cost vector? The elements of this vector represent the independent load values or costs of the corresponding bus. The unit of the cost is $/kW or $/MW
Actually I work on the problem of optimization of a microgrid, the optimization should take into consideration the whole power flows in the power system to satisfy the power balance with respect to conversion efficiency and all other imposed constraints.
So I have a lot of equations and formulations, then I wish to know the best method to simulate and to test this system?
- What's the best solver based on C++ or Java library that I can use it inside simulink model using block or s-function to optimise the powers flow by mixed integer linear programming of my power system and the way to do it?
I notice that I have a sumilink model of the power system simulated using real component of Matlab library, I mean for example to simulate PV arrays I used real component not formulations, so it's possible to use this solver embedded in simulink model to get results?
Finally, I searched a lot of a solver that I can call it easily in matlab simulink and use it inside a s-function using C++ code and also the best way to simulate this system directly in the simulink model without using command line because that make the system very hard regarding that the documentation and sources are very rare?
Please I don't ask for publications with the same problems because I lost a lot of time so I look for a direct sources and solutions?
I am working with rotor angle stability analysis based on matlab program. I need to validate my program with datas obtained from transient stability analysis done in ieee bus system developed in etap. How could i do it
Literature says the data is available in "P. M. Anderson and A. A. Fouad, Power System Control and Stability" (Revised Printing). New York: IEEE Press, 1994. Can someone provide me this data?
I am working on grid vulnerability analysis and I need to run power flow for a grid with high penetration of wind generation. I was wondering what is the most convenient way of modeling wind farms. Can I model them as PQ buses with negative P (negative load)?
Solution should be based on a steady state network using nodal voltage method.
How does PSO represent FACTS bus number and its sizing. Is it possible to embede PSO matlab codes with PSAT power flow rountine?
An example of this approach was seen in T-MAC, but i could not find any recent. I am actually interested to send block acknowledgements for multiple concatenated packets sent by a node. even the packet concatenation schemes do not describe the acknowledgement mechanism followed. Suggestions Please!
An example PSS/E .raw file can include the following data: Bus Data, Load Data, Fixed Shunt Data, Generator Data, Branch Data, Transformer Data (2 winding / 3 winding), Area Data, Two-Terminal DC Data, Zone Data, Owner Data and Switched Shunt Data. Having these data in the PSS/E file, Can anyone get me the corresponding data representation in CIM RDF XML file?
How ca n I draw a curved of receiving-end voltage magnitude as a function of load?
10-2- Please see the attached files.
I spent all morning searching for the error solution on google, so Mathworks and here. I attempted every potential solution I could find: delays, solver changes, saturation, tolerance. I attached the Simulink Power Systems model I have for the verification of my masters research.
While I noticed it originally I dismissed it as I thought Simulink was programmed better with the initial value set, I have narrowed the error down to the voltage measurement origination from the battery model, both the internal and external voltmeter.
Does anyone on here have any idea what settings are required to circumvent this simulation error? Thanks in advance.
I was doing research on capacity credits of renewable energies. I am looking for databases that might contain High resolution data with hourly/daily for Loss of load probabilities and other metrics that are helpful to calculate capacity credits about a farm?
The tools should be able to simulate the transient process after disturbances. Besides, it can also simulate the long-term variation of the power load.
Hi respected fellows, I am working on ring connected distribution system, My question is how can I isolate the faulty portion from the remaining network so, that it will not interrupt the supply to other part. Up till now when I put fault in the system it will shut down the whole system.
i want to regenerate behaviour of constant PQ-loads from Fig.5.a from chapter-2 of this book(Wind Farm – Impact in Power System and Alternatives to Improve the Integration);Despite much effort i cant regenerate that.please guid me.
I want to analyse the integrated power system (having solar as one of the source of power ) using transient simulation software (PSCAD). Is it worth to use the same or should i use different software ?
I am working on resistive switching based memory devices. In my devices, I get off current in the range of 1E-5-1E-4 which is very high. It deteriorates the Ion/Ioff and the hence the device performance. For a memory device, the Ion/Ioff ratio is very important factor. Please suggest me how can I reduce the off current. I research papers I have seen off currents of upto 1E-9.
Recently, I have been using MATLAB to simulate a hybrid renewable energy system (Wind and GCPV plant). Is there any reliable, fast and powerful software that could be used to simulate power systems! DC link power levels! AC/DC Sides of hybrid renewable energy systems!
Actually, there are a model of a turbine in Prabha Kundur book´s only with the effect of the injector but I need a model with the effect of the deflector, too. I have to simulate the turbine in POWERFACTORY of DIgSILENT.
I am trying to create some simple user defined models (UDM) in psat. I am using psat 2.1.9 and tried to create UDM from component browser in PSAT GUI. However, I am unable to define anything like buse or state variable on a new model. I then tried to modify the existing examples and still was unable to do it.
Can anyone help me with it?
I am getting mixed results for the power conversion efficiency measurements in my undergraduate research despite this being a routine procedure, so I would greatly appreciate feedback on the process and calculations I am using.
1) I apply a voltage (mV) in parallel with the solar cell while measuring the current response (mA) using a Wavetech multimeter in series with the cell. This is done for both forward and reverse bias (from -900mV to 900 mV). The cell is illuminated by a solar simulator at 1 Sun (1 000 000 mW/m2) intensity.
2) I calculate power (mW) at each voltage by P = I(mA) * V(mV) and select the highest value in the 1st quadrant (Pmax).
3) I calculate power conversion efficiency as follows:
PCE (%) = (100% * Pmax)/(1 000 000 mW/m2 * cell active area (m2)
Attached is a cartoon of the circuit I'm using.
Thank you for you patience.
I am simulating (by simulink) a distribution network feeder which consists of PV generation site and load. my simulation is too long at time domain so it requires a phasor simulation type (in the configuration parameter of the powergui). However, some of the elements in the model require a discrete simulation type. Running the simulation for the feeder model using a phasor simulation type gave me an error.
May I know how do I go about solving this problem? Any help or advice would really be greatly appreciated!
I am simulating a case of vanadium redox flow batteries with carbon felts of thickness3.8mm at 50 percent SOC.Now I am getting an overpotential across the thickness of negative electrode which increases near the membrane.Can anyone explain why this scenario happens?
I am simulating sensorless control of PMSM. I am giving constant theta at the starting time but my motor is not starting, what could be possible reasons?
For a industry research project we can get distribution grid models which they have modeled in PowerFactory. We would like to work with the models in OpenDSS and Matlab and of course would like to spare remodeling the grids in the software. I can't find anything online to achieve this.
Has anybody achieved exporting from PowerFactory to OpenDSS? Maybe even a self written script to achieve this which he/she is willing to share?
I am trying to catch the electrolyser, storage and compressor cost even from quote but for a bit large case and also if I move from size to bigger size how I can scale the cost based on the big size?
This question pertains to Matlab simulation. I will be grateful in case anyone knows the answer.
Attached .docx file is a Simulink circuit of a inverter simulation. In order to implement close loop control of inverter, I first make it work as rectifier and trying to do its PLL and current control loop implementation. In this quest, I am applying a voltage through a grid and modify it to another level by transformer. I am not able to figure out that after putting any Kp and Ki values, why does the input current waveform shape is not symmetrical? Can any one help me to find the problem? In another file, I have attached Voltage (Upper) and current (Down) waveform taken from grid. The corresponding scope is marked in .docx file.
Hello everyone. I'm designing a 5-level diode-clamped inverter and I have met the following issue: as time passes (0 to 0.5 second simulation) I find a crossover distortion in the output sine wave (filtered) that can be mitigated by increasing the DC capacitors (those which divide the Vdc input into Vdc/2).
To prove this, I have simulated the inverter replacing these capacitors with ideal DC sources (Vdc/2 rated each one) and the crossover distortion dissapears.
As far as I understand, this means that I should have large capacitors in my real circuit, the question is: how to calculate them analytically?
First, all the input variables of function are in the workspace. Then, I enter the function in the command window like this and I can get the results:
However, directly running in the m file , that will cause a fault:
So, what's wrong and how can I run the m file correctly?
For our project, we need to explore the possibility of developing functional blocks for load flow, load forecasting, optimal power flow, etc. in Simulink, without using Matlab code so that the functions can be easily converted as function blocks to hardware using other software. Is it feasible?
I am not electrical engineering student but currently I am looking to measure the pulse width( in fs) of received signal. Given pulse width 10^-13 s, with power level let 1Watt of transmitted pulse, when this pulse is transmitted on channel it is distorted by noise model N, and weakened by attenuation A.
what will be the pulse width of received signal. I can analytically solve it for received signal power/energy distribution (pdf of received signal energy) but I can not calculate the actual received pulse and its pulse width.
I currently use MS visio for drawing Power Electronics circuits and looking for a better one. Any one who can guide me, Please.
I just would like to know if you could recommend me any good laser company for purchasing for this CW 690 nm laser diode with >1W output power I am interested in.
I will develop 345 nm CW laser generation from 690 nm laser diode. if you have similar work experience about diode harmonics, could you give some advice or recommend some references.
the type of the 690 nm laser diode? I choose FP or VECSEL.?
I would be very grateful if by your experience you know of a good one you could recommend me.
hello. I want to use 123 node test system for switch placement. Can anyone help me about the types of conductors to use? its given data or other ones? because it is imbalance and i want to implement in balance condition.
This is a real world problem:
There is a PV plant which covers 10km x 2km. In the center of the plant, there is a weather station, which measures GHI / POA irradiations and reference cell temperature.
I am going to simulate a PV cell model for each string in the plant. As we can see, only weather station data are available.
Thus, is it possible to estimate irradiation / cell temperatures in every location of 10km x 2km area based on the weather station measurements?
There are companies which can provide 15m x 15m resolution irradiation / cell temperature, how can they achieve it ?
I need high resolution say, a measurement interval of 15 mins - 30 mins solar radiation data for my research. Most of the hourly data archives have average hourly solar radiation which don't accommodate the variation in horizontal direct beam radiation (looks like a smooth deterministic curve). I need to see the deviations in radiation due to cloud and other obstructions if any.
Please comments your suggestions. Thanks in advance!
I need to valid test system of Radial low-voltage unbalanced distribution system. Each one of the Lines & loads in this system is an impedance (as R & X ).In this test system, the real & reactive power can be defined or not.The important cases at the required test system are:
1-Radial Distribution system
3-unbalanced in load side
4-Impedance values of lines & loads
Earthing is return path. If my source is isolated from earth we don't need earthing. Then why we use earthing based system?
How can we correct the power factor of two switch non-inverting buck-boost converter? because in boost mode it is easily corrected but in buck mode input current is discontinuous ?