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.
