Ok, you made me go back and look at this again … and I think you are right. What I said about (6.4) implying a negative reserve quantity was wrong. So it does look like dispatchable loads can contribute to reserve requirements just fine with our implementation, as your example shows.
Thanks for keeping me honest, -- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Mar 21, 2014, at 3:39 AM, Tommy k <[email protected]> wrote: > Dear Dr Zimmerman, > > I have the attached case which converges with runopf_w_res and I have left > the reserve contribution of the dis patchable load positive. > > Would you think this model could work? > > Regards > Tommy > > > On Thu, Mar 13, 2014 at 6:50 PM, Ray Zimmerman <[email protected]> wrote: > I don’t think this scenario makes sense in the context of the reserve market > as implemented, which is only for positive reserves. The constraint in (6.4) > means that the reserve quantity for a dispatchable load would be negative, so > it doesn’t contribute positively to the requirement in (6.5) and I don’t > think it would be non-zero. > > In any case, that reserve implementation was not designed with dispatchable > loads in mind. > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Mar 12, 2014, at 3:19 PM, Tommy k <[email protected]> wrote: > >> Dear Dr Zimmerman, >> >> Thank you, that worked. Would it be possible to price a dis-patchable load >> out of the energy market but leave it competitive as a reserve resource? >> >> Regards >> Tom >> >> >> On Wed, Mar 12, 2014 at 12:58 PM, Ray Zimmerman <[email protected]> wrote: >> There is nothing special about 3-bus models, but even the standard OPF >> (without reserves) is infeasible on your 3-bus case. Try relaxing the >> voltage limits on buses 1 and 2 and relaxing the line limits until you can >> get runopf() to converge. Then you can gradually tighten up the constraints >> and see where the problems arise. Once you have a converging OPF with >> reasonable values, try adding the co-optimization of reserves. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> B30 Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> On Mar 11, 2014, at 6:10 PM, Tommy k <[email protected]> wrote: >> >>> Dear Dr Zimmerman, >>> >>> The attached 3 bus case file which converges with runpf but not with >>> runopf_w_res('case3',mpopt,'test1','test2'); >>> >>> Will co-optimisation not work on a three bus model? >>> >>> >>> Thanks >>> Tom >>> <case3.m> >> >> > > > <case3.m>
