My experience is to use fmincon (or any other part of the optimization package) as a last resort only. For AC optimal power flow try the TSPOPF or MINOPF package, for DC optimal power flow use BPMPD, or even better download and compile CLP from the COIN-OR project.
See the MATPOWER homepage for download details. Regards, Thomas Trötscher ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of mohammad reza salehizadeh Sent: 7. oktober 2009 05:54 To: [email protected] Subject: fmincon Dear Dr. Zimmerman, Thank you for establishing this useful email list for debating about challenges around Matpower program. As we know 'fmincon' function used for OPF calculation. It is based on quasi-newton technique. When Exitflag becomes zero or negative we say the OPF doesn't converge. On the other hand, we can see in such cases the feasible set is not null so we have certainly optimal point and therefore maybe the optimization method used in fmincon function is not strong enough to find optimal point as it is sensitive to initial point. How can coverage be guaranteed in Matpower program when feasible set of OPF is not null? Best regards, M.Reza Salehizadeh Electrical Engineering PhD student Science& Research Branch Islamic Azad University Tehran-Iran
