Dear Ray, Thank you very much for your help. The problem caused by the fact, that the physical ramp limits in the gen matrix (RAMP_10, RAMP_30 …) were set to zero.
Kind regards, Maurus > On 20 Sep 2016, at 20:53, Ray Zimmerman <r...@cornell.edu> wrote: > > Well, it is possible that it is simply the solution with least expected cost. > If, for instance, other generators have large ramping or redispatch costs, it > can be optimal to simply not use a generator that may fail in order to avoid > redispatch costs. On the other hand, physical ramp limits (RAMP_10 in the gen > matrix) can also prevent the dispatch from differing in the contingency and > base states. Large redispatch or reserve costs on the generator in question > can also be a possible cause (I know you said you tried zero reserve costs, > so that shouldn’t be the cause in this case). One more idea … is the > generator so expensive that it isn’t used at all, even if NOT modeling > contingencies? > > Ray > > > >> On Sep 20, 2016, at 12:01 PM, Rusch Maurus <rus...@student.ethz.ch> wrote: >> >> Dear all, >> >> I am currently trying to model generator contingencies in MOST. However, my >> problem is, that there is no variation of generator dispatch over all the >> modelled states. The generators with a contingency assigned have therefore >> zero dispatch in the base and contingency state. Consequently I get no >> differences between the base case and the states in which contingencies do >> occur. >> Moreover I have applied the same set up to model transmission line >> contingencies. This setup doesn’t cause any problems and I am getting >> different power flows in the base state and the states with contingencies. >> >> In my setup, I have assigned a big amount of positive/negative reserve >> quantities with zero reserve costs to the generators with modelled >> contingencies. I have already tried to define contingencies for all kind of >> generators (different maximum capacity, different marginal costs). The >> system I am simulating consists of 940 buses, 4500 generators and 1350 >> transmission lines. >> >> Did someone have the same problem? What could be the reason that I don’t get >> any differences in generator dispatch among the modelled states? >> >> Thank you very much for any kind of inputs and advices >> >> Maurus Rusch > > >
