Dear Jose L. Marin and Dr.Zimmerman,
Thank you Mr.Jose L. Marin for your detailed explanations. I also thank Dr.Zimmerman for giving hint in using find_islands() function. Regards, Babulal On 31-10-2014 18:15, Jose Luis Marin wrote: > Hello Babulal, > > I believe that the problem is that MATPOWER does not automatically remove > islands when running a powerflow. Each of the three contingencies you list > happen to isolate a bus, therefore the network needs to be reduced prior to > the call to runpf (Ray -- please correct me if I'm wrong). > > You can use extract_islands() for this: > >>> mpc = loadcase(IEEE30_Conting9_11) > > mpc = > > version: '2' > baseMVA: 100 > bus: [30x13 double] > gen: [6x25 double] > branch: [41x13 double] > >>> mpc_reduced = extract_islands(mpc, 1) > > mpc_reduced = > > version: '2' > baseMVA: 100 > bus: [29x13 double] > gen: [5x25 double] > branch: [40x13 double] > > Running runpf() on this reduced case works OK for the contingencies you list. > > -- Jose L. Marin > Gridquant España SL > Grupo AIA > > On Fri, Oct 31, 2014 at 9:41 AM, ckbeee <ckb...@tce.edu> wrote: > >> Dear Dr.Zimmerman, >> >> When I perform the power flow for the following contingency in case_ieee30.m >> system, MATPOWER experiences numerical instability. >> >> 1. Line number 13 (Connected between buses 9-11) >> 2. Line number 16 (Connected between buses 13-12) >> 3. Line number 34 (Connected between buses 25-26) >> >> It means no solution exist for these contingencies. It does not give results >> for OPF also. >> >> Thanks in advance. >> >> Regards, >> Babulal >> -- >> ---------------------------------------------------- >> Assistant Professor >> Department of Electrical and Electronics Engineering >> Thiagarajar College of Engineering. >> Madurai-625 015. Tamilnadu. India. >> Mobile: +91 98439 17258 [1] >> ck_babu...@gmail.com >> ---------------------------------------------------- >> -------------------------------------------------------------- >> This email was sent using TCEMail Service. >> Thiagarajar College of Engineering >> Madurai-625 015, India -- ---------------------------------------------------- Assistant Professor Department of Electrical and Electronics Engineering Thiagarajar College of Engineering. Madurai-625 015. Tamilnadu. India. Mobile: +91 98439 17258 ck_babu...@gmail.com ---------------------------------------------------- -------------------------------------------------------------- This email was sent using TCEMail Service. Thiagarajar College of Engineering Madurai-625 015, India Links: ------ [1] tel:%2B91%2098439%2017258
