Not without modifying the code. It would involve adding another set of non-linear constraints, which unfortunately is not trivial. It involves modifying the Jacobian and Hessian calculations for constraints as well as modifying the non-linear constraint indexing, which is based on the assumption of only a single set of branch flow constraints.
Ray > On Mar 26, 2015, at 6:14 PM, Gamze Dogan <[email protected]> wrote: > > Thank you for your answer. > > Is there a way to limit both current and apparent power? > > Thank you, > > > Gamze > > ________________________________ >> From: [email protected] >> Subject: Re: Branch flow limits in OPF >> Date: Wed, 25 Mar 2015 11:03:03 -0400 >> To: [email protected] >> >> By default, the “flow” constraint in the AC OPF is on apparent power >> (in the DC OPF, it’s active power), not on current, which probably >> explains what you are seeing. See the 'opf.flow_lim' option to change >> the default. >> >> Ray >> >> On Mar 25, 2015, at 4:55 AM, Gamze Dogan >> <[email protected]<mailto:[email protected]>> wrote: >> >> Dear all, >> >> >> I have a question regarding the power flow limits in the OPF. The flow >> is limited by the branch value rateA. >> >> >> I wanted to calculated the pourcentage of flow in my lines after the >> OPF succeeded. I did it this way: >> >> >> V(d,1) = results.bus(d, 8) * exp(1j * results.bus(d, 9)*pi/180); >> >> >> [Ybus, Yf, Yt] = makeYbus(mpz); >> >> >> Ifrom= Yf*V; >> >> >> pourcentage_line(d) = ( abs(Ifrom) (d) * results.baseMVA) / >> results.branch(d,6) *100; >> >> >> First, could you tell me if this is correct? >> >> Secondly, I have trouble interpreting the results as at the end of my >> OPF I get pourcentage of flows higher than 100%, for me as the flow has >> been limited to the rate A value, I sould not get flows higher than >> 100%. >> >> Thank you for any help on the subject, >> >> Regards, >> >> >> Gamze >> >> >
