Re: Convergence Issue for Distribution Network Power Flow Analysis

[Carlos E Murillo-Sanchez]

Hi; You have used the TAP column of the branch table to indicate two transformers with a 55:1 ratio, and then you used the LV impedances, I think, still in PU with a base voltage of 22KV; they are pretty large.  The TAP column should be used to specify small variations about 1.0 for true tap-changing transformers.  All branch impedances should be specified using a single pu system.   I believe that the following is what you are actually trying to run: define_constants; mpc = loadcase('caseSG'); mpc.branch(3:end, BR_R:BR_X) = mpc.branch(3:end, BR_R:BR_X) / 55^2; mpc.branch(3:4, TAP) = 0; runpf(mpc); #ZHANG TIAN# wrote: Dear All,   I am using Matpower for a distribution network power flow analysis.   The data I used are taken from a real network, and the network is working fine using PowerWorld simulator. Basically, it is a radial network with 14 buses. Bus 1 is the connection point to the main grid, which I modelled it as a slack bus (type 3).   However, when converting the model into a Matpower case, I can only get a failure notification “Did NOT converge (0.01 seconds)”.   Does anyone have any idea about what might be the problem? Or what are the options for me to debug?   I attached my case data in this email for your reference.   Thank you all very much.   Best regards, Tian