For example, for a linear generator offer expressed in $/MW of ... offer(Pg) = 50 + 0.2 * Pg
... the corresponding total cost function for gencost would be ... totalcost(Pg) = 50 * Pg + 0.1 * Pg^2 So the corresponding row of gencost would be ... 2 0 0 3 0.1 50 0 I'm not sure I understand your last question. But, fixed bids/offers correspond to linear costs in the gencost matrix. Linear bids/offers would correspond to quadratic costs in the gencost matrix. Hope the example helps, -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Apr 3, 2012, at 3:31 PM, Roberto Carvalini wrote: > Could you please give me an example of gencost matrix because the in the > 't_auctioncase.m', the gencost is not fixed. So, my question is this, in what > way I have to change the gencost matrix. Can I say the fixed offers and > nonlinear gencost is equal to linear bids/offers? > > > Best Wishes > > Roberto > > > On Tue, Apr 3, 2012 at 21:14, Ray Zimmerman <[email protected]> wrote: > The bid or offer is essentially a marginal cost, that is, the derivative of > the total cost function that goes into gencost. So essentially, you integrate > the marginal cost (or offer function) to get the total cost function to put > in gencost. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Apr 3, 2012, at 3:01 PM, Roberto Carvalini wrote: > >> Thanks a lot for your help. Is it possible for you to give an example in >> which how a linear offer would correspond to a quadratic gencost? >> >> Best Wishes >> >> Roberto >> >> >> On Tue, Apr 3, 2012 at 20:58, Ray Zimmerman <[email protected]> wrote: >> The runmarket code essentially just takes bids and offers, converts them >> into the corresponding gencost entries, runs the OPF and then repackages the >> results as a set of cleared offers and bids. The runmarket code will not >> handle linear bids or offers, but you can convert your bids and offers >> directly into the corresponding gencost entries and then run the OPF >> directly to get the result. A linear offer would correspond to a quadratic >> gencost. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 419A Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> >> On Apr 3, 2012, at 11:42 AM, Roberto Carvalini wrote: >> >>> Dear Prof. Zimmerman, >>> >>> How can I model a linear bid instead of fixed bids in MATPOWER? For example >>> I want to have a Linear supply bid with fixed demand. Is it possible? >>> >>> Best Wishes >>> >>> Roberto >>> >> >> > >
