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
case33.m
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