I have used the following code to impose power factor constraint for
generators (as you have written for one of the users). How can I
differenciate these two problems, i.e. adding a variable z and specified
power factor as follows: because we will have 2 matix of A
mpc = loadcase('t_auction_case');
nb = size(mpc.bus, 1);
ng = size(mpc.gen, 1);
pf = 0.95;
QPratio = sqrt(1/pf^2 -1);
%% add constraint that QPratio * Pg(i) - Qg(i) = 0, for i = 2 .. ng
mpc.A = sparse([1:ng 1:ng]', [2*nb+(1:ng) 2*nb+ng+(1:ng)]',
[QPratio*ones(ng,1); -ones(ng,1)], ng, 2*nb+2*ng);
mpc.A = mpc.A(2:end, :);
mpc.l = zeros(ng-1, 1);
mpc.u = mpc.l;
Best RegardsD. Xu On Mon, Jun 20, 2011 at 16:08, Ray Zimmerman <[email protected]> wrote: > Section 6.4 references two examples included in MATPOWER. These both use > the callback mechanism. There is another very basic example at about line > 184 of t/t_opf_mips.m that defines the A, l, u and N, fparm, H and > Cwparameters to be passed directly to > opf. As described in the first paragraph of chapter 6, these parameters > can also be specified as additional fields in the case struct, which is how > you would need to do it when calling runmarket. > > -- > Ray Zimmerman > Senior Research Associate > 211 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Jun 20, 2011, at 9:41 AM, Dailan Xu wrote: > > Thank U. Where can I find an example? or could you please give me an > example? > > Best Regards > > D. Xu > > > On Mon, Jun 20, 2011 at 15:28, Ray Zimmerman <[email protected]> wrote: > >> The runmarket code is simply a wrapper around the OPF solver, so it's the >> same as adding variables to extend the OPF. The bus voltages are already >> control variables, but please see section 5.3 and chapter 6 of the manual >> for details on how to extend the OPF with other variables, constraints and >> costs. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> On Jun 20, 2011, at 9:15 AM, Dailan Xu wrote: >> >> > Dear Prof. Zimmerman >> > >> > How can I add an optimization variable to runmarket, for example, adding >> voltage of buses as control variable? Is it possible? >> > >> > Best Regards >> > >> > D. Xu >> > >> > >> >> >> >> > > >
