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]<mailto:[email protected]>> wrote: ________________________________ From: Alexandra Kapetanaki Sent: 27 February 2013 09:47 To: [email protected]<mailto:[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> [X] [X] [X] [X] [X] [X] [X] [X]
<<attachment: IEEE-RTS_new.png>>
