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>
