Thank you so much for your help. It worked now after doing the modifications that you suggested.
On Tue, Nov 8, 2016 at 1:51 PM, André Carvalho Silva < [email protected]> wrote: > Hi there Haneen, > > By thaking a quick look at your matpower case, it seems fairly obvious > that the branch flow limits (rate A in MVA) are missing (they cannot > be equal to zero). > > Also, you should put some P and Q limits in your generator (Qmin, > Qmax, Pmin and Pmax generator fields). > > > Best regards, > André Silva > > > > Citando "Haneen Aburub ." <[email protected]>: > > > Dear Matpowers, > > > > I tried to run a simple AC OPF for IEEE 33-bus (12.66 kV) distribution > > system using PDIPM solver, but it failed. It gave me the following error: > > > > IPM Numerically Failed: unable to solve Ax=b. > > > > My system has only a generator at bus 1 (ref bus) and a linear cost > > function for that generator. > > > > The AC PF using NR converged fine, but I do not know why the AC OPF did > not > > converge? > > > > I tried to relax the voltage limits (0.9-1.1) and using the AC PF > solution > > as a start for AC OPF. But these options did not work too. > > > > Could you please help. I attached my case.m file > > > > Best regards, > > > > Haneen > > > > > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > >
