Thank you so much for your help. 1.I want to maximize SW considering linear offers for generators. How can I introduce the offers? As far as I know when I introduce fixed offers, these are replaced with linear one. With the following coefficients for gencost, 2 0 0 3 0.1 50 0 , if I have the offers, for example, [10 10 10], will the fixed offers will be replaced with linear one?
2. How can I do the same fact for dispatcahble loads, i.e. having linear bids for loads? Best Wishes Roberto On Tue, Apr 3, 2012 at 22:13, Ray Zimmerman <[email protected]> wrote: > 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 >>> >>> >>> >> >> > >
