Hello. I am working on the voltage stability issues of an actual large-scale wind power connected power system and am trying to simulate the occurences of three-phase short circuit faults at different parts of my extensively modelled grid mainly in places of high wind penetration. The problem is that whenever I am simulating 3-ph faults at some busbar that should bring down the voltage to almost 0.15-0.25 p.u. at it, the system is becoming unstable right at after the voltage drop or at the instant of the clearance of the fault with the RMS simulations throwing up errors like 'System Matrix Inversion Failed' or 'Equation System could not be solved. Check control conditions.' This problem is disappearing at relatively less voltage dips at the concerned buses (at around 0.3-0.4 pu and above). So I wanted to know if this is an issue with how the grid has been modelled in actual such that at severe voltage dips it becomes unstable, or is it because of an underlying issue in my modelling of the grid which I may have overlooked in the process. I have followed quite efficient dynamic modelling procedures of the wind turbines as per IEC standards and the conventional generators as per the usual standards. Any help regarding this would be much appreciated.
Hi there, it can be simply due to incorrect initialization of the wind farms. If you increased the number of wind farms manually from 1 to some other number, you should also click on the wind composite model and change the reference power to this new value. The name is PQ meaurement of bus or similar to that, Hope it helps.
@Samundra Gurung: Thank you sir for your suggestion. I looked into the 'PQ measurement' common model of the an wind farm composite model. In it, under the Power Rating area, I have the option 'Rating of connected elements' checked apart from two other options of 'Rated to 1 MVA' and 'User define rating'. Now my query is if I am choosing multiple wind turbines as parallel machines to represent one wind farm, will the composite model automatically update itself for the total capacity or do I need to enter the value of the total capacity under the 'User defined rating' option. Thanks again.
You need to manually change the rated power value and also please donot forgot to change the number of transformers which connect the wind turbine to the grid. The number as you might have guessed should be equal to number of parallel machines. Goodluck
Soudipan Maity : Were you able to troubleshoot the problem ? As, I am also facing the similar problem in PowerfFctory. Kindly let me know.
Regards,
Deepak
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