If you save the case that produces the error and e-mail it to me directly off list, I'll have a look? Simply call "savecase" before calling rundcopf() so that I can reproduce the error.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Feb 27, 2013, at 1:12 PM, Alexandra Kapetanaki <[email protected]> wrote: > Dear Dr Ray, > > Thank you very much for your feedback. > Please find attached the correct IEEE RTS network where the red lines are > always connected to the network but with lower rating(10MVA each). > However, the problem of non structure array remains. > The reference bus is the bus 13. > I would also like to inform you that I have added extra generators in each > bus-load in order to satisfy the demand when the generators capacity is not > adequate. > Also I run the dc-opf and the problem appears with dc-opf, whereas when I > run the AC opf the simulation runs succesfully. > > Thank you once again for your time and your support, > Kind Regrds, > Alexandra > From: [email protected] > [[email protected]] on behalf of Ray Zimmerman > [[email protected]] > Sent: 27 February 2013 16:49 > To: MATPOWER discussion forum > Subject: Re: matpower-problem > > So, if I understand, you are saying that the branches highlighted in red are > always connected, but any number of the other lines could be out. It seems > there is still a possibility of the system separating into two islands by > opening the right branches connected to the 3 buses about 1/2 way down the > page. > > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Feb 27, 2013, at 4:51 AM, Alexandra Kapetanaki > <[email protected]> wrote: > >> >> From: Alexandra Kapetanaki >> Sent: 27 February 2013 09:47 >> To: [email protected] >> Subject: matpower-problem >> >> >> Dear Dr Ray, >> >> My name is Alexandra and I am phd student at the University of Manchester. >> I am writing you because I face difficulties when I use matpower for the >> IEEE RTS 24 network. >> More specifically I have the following error message: >> >> Attempt to reference field of non-structure array. >> >> Error in qps_ot (line 260) >> kl = find(lam.eqlin < 0); %% lower bound binding >> >> Error in qps_matpower (line 240) >> [x, f, eflag, output, lambda] = ... >> >> Error in dcopf_solver (line 222) >> [x, f, info, output, lambda] = qps_matpower(HH, CC, A, l, u, xmin, xmax, x0, >> opt); >> >> Error in opf_execute (line 71) >> [results, success, raw] = dcopf_solver(om, mpopt); >> >> Error in opf (line 225) >> [results, success, raw] = opf_execute(om, mpopt); >> >> Error in runopf (line 96) >> [r, success] = opf(casedata, mpopt); >> >> Error in nonsequential_modified_new (line 244) >> results=runopf(mpc,mpopt); >> >> >> Actually my simulation runs for many iterations and in each of them some >> lines failed randomly and so there is the possibility that there is no >> voltage reference bus in each island. >> For this reason in each iteration I check if the red lines in the attached >> file are connected with the network or not and if one of the them has failed >> I restore it in order to avoid setting >> voltage reference to the islanded buses. Therefore, in each iteration the >> red lines are connected with the network and so one voltage reference bus in >> bus 13 is adequate. >> However, I face the same error message after few iterations. >> Do you have any idea about this problem? >> Is there any condition that I didn't take into consideration? >> >> Thank you in advance, >> I look forward for your feedback, >> Kind Regards, >> Kapetanaki Alexandra >> <matpower-problem (1).zip> > > <IEEE-RTS_new.png>
