Dear Mr. Ray, Thank you very much for your suggestion.
I would like to elaborate my problem a bit. I am trying to use MATPOWER to see how much load a system can bear...for example: I am increasing the load by certain factor and trying to see how far it can go without diverging. For this, what I have to do is....until and unless the reactive power hits the limits, the voltages at the PV bus should be fixed at the specified value but if the reactive power hits the limit, that particular bus is considered as a PQ bus and then the voltage of that particular bus would be a variable. It is similar to the traditional power flow programs. So, could you please suggest if it is possible to do with the present matpower? Looking forward to hearing from you soon. with best regards Sarina On 5/8/07, Ray Zimmerman <[email protected]> wrote:
It is not possible to do this directly with the OPF. I'm not sure if this will accomplish what you want, but first you could run the OPF with relaxed voltage limits to find the real power dispatch. Then use that real power dispatch and run a simple power flow with the desired voltage setpoints and the ENFORCE_Q_LIMS option set to true. Be aware that this could cause line limits to be violated. -- Ray Zimmerman Senior Research Associate 428-B Phillips Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On May 8, 2007, at 7:52 AM, Sarina Adhikari wrote: Dear Sir, I have been trying to fix the voltages of the generator buses until the generator reactive power limits are reached. However, when I do this, the OPF simply diverges. I have already relaxed the line limits as well as voltage limits. The thing I am trying to do is, fix the voltages of generator buses until the reactive power limits are reached and if one of the generator hits the reactive power limits, simply relax the voltage constraints of that bus and so on. But I am really having problem with this. Is this modification possible with matpower? If yes, what could be the easiest way to do this? I would be very much grateful if you could send me some suggestions regarding this at the earliest as I have been stuck on this point. Looking forward to hearing from you soon. sincerely Sarina
