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 > > > > >
