Dear Matpower Community,
I’m working on power flow project and have used grid data from database. I have modelled all line parameters (R X B) in p.u. system, also same for transformers and kept generator output until it satisfies active and reactive power demand. For renewable generation, I specified as negative demand on respective buses. I checked all possibilities mentioned in FAQ ( http://www.pserc.cornell.edu/matpower/#pfconvergence ) but couldn’t figure out problem. Also I checked (case_info) to see any island but got full system without island. To make the problem simple I used all buses as PQ buses except one slack bus. Also my casefile converges for rundcpf but fails to runpf and gives error like ‘Newton's method power flow did not converge in 10 iterations.’ Also I found that when I use following code- opt = mpoption('OUT_BUS', 0, 'OUT_BRANCH', 0, 'VERBOSE', 2); mpc = loadcase('casefile'); results =runpf(mpc,opt); may be it gives me divergence of PQ mismatch instead of convergence. MATPOWER Version 5.1, 20-Mar-2015 -- AC Power Flow (Newton) it max P & Q mismatch (p.u.) ---- --------------------------- 0 2.296e+01 1 1.729e+01 2 2.450e+03 3 2.352e+03 4 6.962e+06 5 1.740e+06 6 4.352e+05 7 1.753e+07 8 4.382e+06 9 3.322e+06 10 8.303e+05 Newton's method power flow did not converge in 10 iterations. >>>>> Did NOT converge (0.23 seconds) <<<<< results = version: '2' baseMVA: 100 bus: [1086x13 double] gen: [467x21 double] branch: [2145x17 double] order: [1x1 struct] et: 0.2320 success: 0 I will be very thankful for your help. Regards Mirish Thakur. KIT, University.
