First of all, when asking a new unrelated question, please don’t just reply to a previous message. Start a new thread with a new subject.
So, are you saying your are attempting to run an AC OPF problem where Pg is fixed and Qg are the only free variables? If so, the only way it really has a chance of working is if the loads and active power generation are feasible for the AC OPF problem (e.g. you got them from an AC OPF solution). In that case, the original Qg solution should also be feasible. However, this is a very constrained problem that may only have a single feasible solution point (corresponding to the original AC OPF values of voltage and reactive injection). If however, the Pg values and the loads are not guaranteed to be feasible (i.e. coming from an AC OPF solution), then branch flows may violate their limits and it may not be possible to dispatch reactive power in a way that results in system losses exactly matching the difference between specified load and specified generation. I.e. the problem may be over-specified and therefore infeasible. Ray > On Sep 21, 2015, at 7:45 AM, Mirish Thakur <mirishtha...@gmail.com> wrote: > > Hello MatPower community, > > > > I want to analyze monetary consequences of reactive power dispatch on energy > market which is already considering real power prices only. For this I have > data of conventional power plants dispatch for every hour in whole year and > respective variable cost of generation. I’ve active and reactive power demand > for each hour as well. For this case I want to keep generator dispatch > Pg=Pmin=Pmax (no change in active power generation) and Pd and Qd (real and > reactive demand) as per given for whole year. Also I want to keep RATE_A > value constant in opf. But I’m facing convergence problem in runopf. runopf > doesn’t converge until and unless I make Rate_A value 1.5 times and some > changes in Pmax and Pmin values at input side. Is there any alternate way to > get convergence without making any changes in Pg, Pmax, Pmin and Rate_A > value? (For example any changes in line parameters or something else). Thank > you for your time. > > > Regards > Mirish Thakur > KIT University.
