Blown up Cases in PSSE
Blown up Cases in PSSE
(OP)
Hi all,
Any advices in solving blown up case in PSSE? I have been burdened with a very difficult studied case and can't get it solve. Any strategy would be appreciated. Thanks.
Any advices in solving blown up case in PSSE? I have been burdened with a very difficult studied case and can't get it solve. Any strategy would be appreciated. Thanks.






RE: Blown up Cases in PSSE
I know with Easypower Tech Support, I can always send them the model and they can look at it and tell me what's wrong. Can you do that with PSSE?
RE: Blown up Cases in PSSE
So what do you know about the case? What is PSSE?
RE: Blown up Cases in PSSE
You can try here:
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RE: Blown up Cases in PSSE
RE: Blown up Cases in PSSE
RE: Blown up Cases in PSSE
1. Identify what caused the divergence--i.e. did you add a new line, change a generation pattern, paste in a new sub system, etc. It helps to know where the maximum mismatch is at as well. Are you using divergence control in PSS/E? You should be...
2. Next step is really "playing " with the case, i.e. you sneak up on what is causing the divergent solution. This might mean setting bus angles to the same value when closing a line, chaning the X value to slowly put a line in service, adding temporary VAr support generators to help the case solve, etc. You might also slowly change load or generation output instead of all at once.
3. Always remember that the "slack generator" is in fact a real machine!!!!! Respect its limits--dispatch generation instead of letting the slack bus take all of the initial generation changes, etc
4. Be alert to the fact that divergence can mean a point of voltage collapse as well as simple numerical instability. Performing PV and QV curve analysis will help you see if this is in fact the problem.
5. Ask around at your place of work, an "old timer" will have knowledge of all of the tricks of the trade in helping a load flow solver solve a case.
6. Finally, don't forget that the PTI folks are an excellent resource. If you can send them the case they can help you understand why it isn't solving.
Also, don't forget that GE's PSLF and PowerWorld Simulator are other tools that might solve your case, I use all three and find that (at times) one program will solve a case that others will not. In my experience PowerWorld Simulator probably has the best solver for cases like what you are running into....
RE: Blown up Cases in PSSE
Your help is much appreciated. Got my case working through series of grinding. Thank you.