Hi, Ray: I have the same issue. My grid is being studied with OPF and even tough I knew from the beginning that gencost matrix cannot be supressed at all, I have tried to assume that gencost=0 in order to not take into count any cost so far.
But Matpower doesn't accept gencost=0 and I don't know why. I would like to have a solution to my problem because when I use Matpower with a Optimization Tool belonging whether to Matlab or Opti Toolbox, it takes too long the computation time and that's an advantage I would like to keep on taking of when running an OPF. Thanks is advance for the reply. Best regards Brenda Rojas El jueves, 23 de febrero de 2017, Ray Zimmerman <[email protected]> escribió: > The OPF (and the problem solved by MOST) are optimization problems, which > means they are attempting to minimize some cost subject to constraints. So, > no, you can’t eliminate the cost function. If you aren’t trying to minimize > a cost, I’m not sure that MOST or OPF are the right tools. > > And, by the way, the error you are seeing appears to be related to > dispatchable loads (which also make no sense without a corresponding > benefit or “cost”). > > Ray > > > On Feb 21, 2017, at 7:03 AM, Alberto Claudio Alvisi < > [email protected] > <javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote: > > Hi, > > I've just written saturday about my problem: > > > "Dear all, > > I'm working on my thesis using MATPOWER, but I' ve this problem with > MOST tool: > > *Error using .* * > *Matrix dimensions must agree.* > > *Error in most (line 2116)* > * mpc.gen(ivl, QG) = mpc.gen(ivl, PG) .* Qlim ./ Pmin(ivl);* > > *In particular: * > > *Qlim =* > > * []* > > mpc.gen(ivl, PG) > > ans = > > Empty matrix: 0-by-1." > > > *After I've read more documentation about MATPOWER and MOST tool, I > understand that the OPF solution required to find the min f(x) with a > constraint of cost.* > *I've a case without gencost and I prefer to not create a gencost matrix > to solve it because the cost of PG don't matter in my case. * > *It's possible to impose that MATPOWER doesn't study the cost of PG during > the solution process? In other words, is there a MATPOWER option to leave > the cost constraint?* > > > *Thanks a lot for your contribution* > > *Regards* > > > ALBERTO CLAUDIO ALVISI > *Student at University Of Bologna* > > >
