No. The loads, PD and QD, are NOT in p.u., they are in MW and MVAr. Check the documentation for caseformat or Table B-1 in the User’s Manual <http://www.pserc.cornell.edu/matpower/manual.pdf>.
Ray > On Feb 24, 2015, at 7:32 AM, mohammad reza Andervazh <[email protected]> > wrote: > > 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] <mailto:[email protected]>> wrote: > rem > > > On Tue, Feb 24, 2015 at 2:03 AM, #ZHANG TIAN# <[email protected] > <mailto:[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]> > [mailto:[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 > > > > > > >
