Dear Mr. Ray, I have another very brief question. I have noticed in MATPOWER that the derivatives of the constraints are calculated after the calculation of the constraints. Does it represent the necessary conditions as in an ordinary optimization process? How does it affect the solution of OPF?
Hoping for your quick reply. thank you. 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
