I also was going to suggest that you use runduopf(). -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645
On Apr 23, 2013, at 2:53 PM, angelina sirri <[email protected]> wrote: > Dear Dr Zimmerman, > I decided that, for the hours that the load exceeds the minimum generation I > will run a dupf.I tried it and it works fine. I was confused, because case > 24ieee is a matpower case, so I had thought that it should work correctly if > I don't do any modifications.But do a yearly simulation is an extention of > the fixed peak load that there is in mpc.bus(:,2). > Anyway! Please correct me if I am saying something wrong. > Thanks for your time and help! > Regards, > Angelina > > From: [email protected] > To: [email protected] > Subject: RE: negative generation on opf > Date: Tue, 23 Apr 2013 19:54:09 +0300 > > Dear Dr Zimmerman, > Thanks a lot for your help. > I ran a dc opf for case 24ieee without considering any faults, for the whole > year, in which the load in the buses is the one determined from ieee > reliability test system with annual system peak 2850 MW and annual system min > 965MW. For the hours that don't converge, I checked the sum of the load for > all the buses and the PMIN and PMAX and I saw indeed what you said. > For the times that the dcopf does not converge the sum of pmin for the > online generators is greater than the sum of the load for that hour.So the dc > opf does not converge for all the hours that the load is lower that 1040 MW, > which is the sum of Pmin for all the generators. > I am a bit confused!How I can solve that problem?Can I make the assumption > that the dcopf is a success for those cases?How can I control the generators > , in order to have some of them shut down for those cases? > Thanks for your time. > Regards, > Angelina > > From: [email protected] > Subject: Re: negative generation on opf > Date: Mon, 22 Apr 2013 16:31:09 -0400 > To: [email protected] > > When the OPF does not converge, the result is often meaningless. Finding the > reason for unfeasibility can be a non-trivial task. Start by checking that > total fixed load lies between the sum of PMIN and the sum of PMAX for the > on-line generators. Try removing all of the line flow limits. Try a simple > power flow with what you think are reasonable voltage and real power set > points for the generators. > > Once you find a feasible OPF solution you may be able to modify parameters > gradually toward the infeasible case to determine which constraints bind and > then conflict. > > Hope this helps, > > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Apr 22, 2013, at 2:19 PM, angelina sirri <[email protected]> wrote: > > Dear Dr Zimmerman, > I am doing reliability study in case24_ieee_rts and I have put extra > expensive generators in load buses, in order to calculate the load > curtailment.I did acopf but for some hours opf did not converged and I saw > that the Qmin and max limits were violated.I couldn't find why, So I tried to > do dcopf and now, it does not converges again and I see that the extra > generators that I have put, some hours generate negative power of small value > (like -0,0025).Have you got any idea why is this happening or what should I > check?? > > Regards, > Angelina > >
