Dear Mr. Uzbekov, I think that your case could be an ill-conditioned or an unsolvable one. In power system problems that means that:
* Its loading level is close its maximum loading point or beyond it (in this case it is unsolvable). * Maybe you are using a poor initial guess. That situation could lead a standard solver (as Newton-Raphson) to a trajectory that diverges. This occurs although actually there is a feasible operating point. Best regards, On Tue, Jan 20, 2015 at 2:48 PM, Artur Uzbekov < [email protected]> wrote: > Dear Mr. Zimmerman, > > Or anyone who can help me. > I am trying to run a model of a big grid in Matpower. > It has 130 loads, 329 generators and 286 branches. > I obtain an optimal solution for DC Power Flow problem which is most > probably correct (it corresponds to the real data). > But For AC Power Flow and both DC and AC OPF problems, I get the following > message: > Warning: *Matrix is close to singular or badly scaled. Results may be* > *inaccurate. *And the success flag is 0. > > I have checked that the are no islands in the network. > In some forums people write that it could happen due to the bad modelling > or too heavy loads. > But for me this explanation is not clear. Can you please comment on that > or suggest any other explanation. > > Looking forward to hear from you! > Arthur > -- Jorge Fernando
