Please make sure that the loads i.e. PD and QD in mpc.bus are in p.u. Run the program again. It'll works. good luck.
Andervazh On Tue, Feb 24, 2015 at 1:09 PM, Carlos Gonzalez Almeida < [email protected]> wrote: > rem > > > On Tue, Feb 24, 2015 at 2:03 AM, #ZHANG TIAN# <[email protected]> > wrote: > >> Hello! >> >> >> >> Yes, by changing the LV impedances I can get the correct results. This is >> worth noting that the data in the “Model Explorer” in PowerWorld Simulator >> is in per unit based on the whole system, rather than its real value. >> >> >> >> Many thanks. >> >> >> >> Tian >> >> >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *Carlos E >> Murillo-Sanchez >> *Sent:* Monday, February 23, 2015 22:56 >> *To:* MATPOWER discussion forum >> *Subject:* Re: Convergence Issue for Distribution Network Power Flow >> Analysis >> >> >> >> 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 >> >> >> >> >> > >
