See FAQ #1 <http://www.pserc.cornell.edu/matpower/#lossminimization>.
Ray > On Nov 10, 2016, at 10:15 PM, Angel Pastor <[email protected]> wrote: > > Thankyou for the help, mister Ray, i did what you told me and the OPF > converged, i put generators in every bus and had to modify my voltage > constraints from Vmax=1.05 and Vmin=0.95 to Vmax=1.1 and Vmin=0.9, and also > some branch flow constraints, but i think i can solve that by checking the > loads... > > > Now, i wanna modify the OPF's objective function to minimize the power losses > in the branches, and the reactive power compensation (the reactive power > injected by the generators that i added), ¿how can i access the objective > function to make the modifications? > > > > De: [email protected] > <mailto:[email protected]> > <[email protected] > <mailto:[email protected]>> en nombre de Ray > Zimmerman <[email protected] <mailto:[email protected]>> > Enviado: martes, 08 de noviembre de 2016 02:43 p.m. > Para: MATPOWER discussion forum > Asunto: Re: Optimal reactive compensation in MATPOWER > > If you have a power flow solution, you could relax the generator, voltage and > branch flow limits to include the power flow solution. Then gradually begin > to tighten the constraints by moving the limits gradually toward their > original values and resolving the OPF. This way you may be able to discover > which constraints are in conflict with one another. > > Ray > > >> On Nov 8, 2016, at 11:05 AM, Angel Pastor <[email protected] >> <mailto:[email protected]>> wrote: >> >> And ¿is there a way to "make" the OPF converge?... Which would be the main >> reasons why an OPF does not converge? >> >> >> De: [email protected] >> <mailto:[email protected]> >> <[email protected] >> <mailto:[email protected]>> en nombre de Ray >> Zimmerman <[email protected] <mailto:[email protected]>> >> Enviado: martes, 08 de noviembre de 2016 11:45 a.m. >> Para: MATPOWER discussion forum >> Asunto: Re: Optimal reactive compensation in MATPOWER >> >> I’m afraid I cannot speculate on the reasons for non-convergence of the OPF >> in your case. There are numerous ways in which an OPF problem can end up >> with an empty feasible region. >> >> Ray >> >> >>> On Nov 8, 2016, at 12:07 AM, Angel Pastor <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Thank's for your answer mister Zimmerman, i tried with some of the cases in >>> the Matpower files like the case30 and case14 and it worked. >>> >>> >>> But in the system i'm working the OPF does not converge and it says it >>> numerically fails, when i run the normal power flow it converges but it >>> doesn't satisfy neither the voltage or the generation constraints, ¿that >>> could be the reasson why the OPF does not converge? >>> >>> >>> I was trying to apply an optimal reactive compensation to solve that >>> problem and get the OPF satisfying all the constraints. >>> >>> >>> >>> De: [email protected] >>> <mailto:[email protected]> >>> <[email protected] >>> <mailto:[email protected]>> en nombre de Ray >>> Zimmerman <[email protected] <mailto:[email protected]>> >>> Enviado: lunes, 07 de noviembre de 2016 11:06 a.m. >>> Para: MATPOWER discussion forum >>> Asunto: Re: Optimal reactive compensation in MATPOWER >>> >>> You could add a generator at each bus and then use an OPF to solve for the >>> power flows, with the real power dispatches constrained to their initial >>> values. >>> >>> Ray >>> >>> >>>> On Nov 6, 2016, at 9:40 AM, Angel Pastor <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> Dear MATPOWER community. >>>> >>>> Hi to everyone, i'm trying to implement reactive power compensation in a >>>> power system, my goal is to make voltage in all buses have values within >>>> the constraints, but i don't know neither the ubication for the >>>> compensation or the MVAR's that would give me the optimal solution and >>>> satisfy all the constraints. So i was wondering if there is a way for >>>> matpower to get me that information. >>>> >>>> My system consist in 14 buses, 5 PV (one generator per bus) and 9 PQ. I >>>> was thinking in modeling the compensators as reactive power generators >>>> with no Pg, as in a OPF the reactive power generated Qg is an optimization >>>> variable, but i only have that variable in the PV buses, and i need to be >>>> able to compensate in any bus to have the optimal solution. >>>> >>>> I could make all the buses PV to put generator in all the buses, but then >>>> the voltage would be attached to de Vg values from the gen_matrix. >>>> >>>> Other idea i had was to add a new variable with the add_userfcn. function >>>> and change the OPF formulation with >>>> >>>> function om = userfcn_reserves_formulation(om, args) >>>> >>>> But i think that variable would still be limitated to to the PV buses and >>>> would only add a reserve to the current generators. >>>> >>>> If you could help me with this, i would really appreciate it. >>>> >>>> Hoping to get response. Thanks in advance. >>>> >>>> Angel Araque, Electrical Engineering student in University of Los Andes. >>>> Venezuela
