My guess is that opening those lines is creating islands. Use the function case_info to extract the islands. See http://www.pserc.cornell.edu//matpower/#pfconvergence for info on non-convergent power flow.
Shri From: Pinak Panda <[email protected]<mailto:[email protected]>> Reply-To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Date: Fri, 16 Jan 2015 19:42:46 +0530 To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Subject: Re: non convergence of 69 bus radial distribution system Dear Power Globers, Thank you Idris for your input I have updated the case file and it converged. I am working on changing topology of the network and finding out it's effects.If suppose I want to use the tie lines and for restraining radility opens five section switches say [3 43 48 24 18]. As I typed >> op=[3 43 48 24 18]; >> temp=loadcase(case69); >> for i=1:5 temp.branch(op(i),11)=0 end >> runpf(temp) It shows a warning as Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.724770e-017. > In newtonpf at 108 In runpf at 224 I am here attaching the case file. Please help me in this. Thanks and regards Pinak Kolkata,India On Sun, Jan 11, 2015 at 8:19 PM, Idris Musa (PGR) <[email protected]<mailto:[email protected]>> wrote: Hi Panda, The real and the reactive loads (PD and QD) in column 3 and 4 of mpc.bus should be in MW and not kW as you currently have. Simply divide the current values representing PD and QD in columns 3 and 4 by 1000, and the power flow will converge. Idris From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Pinak Panda Sent: 11 January 2015 05:48 To: [email protected]<mailto:[email protected]> Subject: non convergence of 69 bus radial distribution system Hi all, I am trying to converge the power flow of 69 bus radial distribution by NR method here is the case file I have created.the error shows, It is not getting converged in 10 iterations. Please help me in this regard. Thanking you, Pinak Panda M.Tech-scholar SRIT Kolkata India
