MATPOWER treats generators with PMAX == 0 and PMIN < 0 as dispatchable loads and constrains their power factor. It should work with positive or negative reactive power consumption. Just make sure QMAX > QMIN.
Ray On Aug 1, 2014, at 6:41 AM, HEGGIE Alastair <[email protected]> wrote: > ​Hi Shri, > > >You can model it as a generator in MatPower with a negative Pmin, Pmax and a > >positive Qmin, Qmax. > > My thought was that if I do this Matpower won't recognize it as a > dispatchable load and hence won't maintain a constant power factor - perhaps > I'm mistaken here, I'll gave it a go though and it seems to be working. > > >What kind of load is this???​ > > Honestly, I don't know. See the load at bus 9 in the attached model. It is > one of the test cases supplied with MATPOWER so I assume it is not in error. > > Thanks, > Alastair > From: [email protected] > <[email protected]> on behalf of Abhyankar, Shrirang > G. <[email protected]> > Sent: 01 August 2014 03:39 > To: MATPOWER discussion forum > Cc: MATPOWER discussion forum > Subject: Re: Dispatchable loads with negative reactive demand > > > > On Jul 31, 2014, at 9:17 AM, "HEGGIE Alastair" <[email protected]> wrote: > >> Dear all, >> >> Does anyone know if it is possible to convert a load to a dispatchable load >> if the load at a bus has negative reactive demand (and positive real demand)? > You can model it as a generator in MatPower with a negative Pmin, Pmax and a > positive Qmin, Qmax. What kind of load is this??? > > Shri >> >> For example, buss 9 in the 39 bus example, case39.m has a reactive demand of >> -66.6. Setting Qmin to -66.6 would not model this correctly but If I set >> Qmin to 66.6 and Qmax to 0 the OPF does not solve. If I set Qmin to 0 and >> Qmax to 66.6 I don't think matpower recognizes this as a dispatchable load. >> ​ >> Many thanks, >> >> Alastair Heggie >> The University of Edinburgh is a charitable body, registered in >> Scotland, with registration number SC005336. > <case39.m>
