Thank you so much for your help. Best Wishes
Roberto On Wed, Apr 4, 2012 at 15:17, Ray Zimmerman <[email protected]> wrote: > 1. I think you misunderstood my suggestion. Since runmarket does not > handle linear offers, you cannot use it for what you want to do. You will > have to manually set up the appropriate OPF problem (with the corresponding > quadratic costs), and call runopf instead. > > 2. See section 5.4.2 in the manual on dispatchable loads to see the > correspondence between the marginal benefit or bid function for the load > and the corresponding total cost function for the negative generator. The > example uses blocks, but you will have to derive the same for a linear bid > function and corresponding quadratic total cost. > > 3. It is simply appears as a constant in the objective function, so it has > no effect on the solution. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > On Apr 3, 2012, at 6:53 PM, Roberto Carvalini wrote: > > 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? > > > > On Apr 3, 2012, at 7:17 PM, Roberto Carvalini wrote: > > Another question: > 3. In some cases C0 is equal to zero in some others is not zero. What is > difference between these two cases when do runmarket because in both cases > the offer function is the same. > I am so sorry for disturbing you. > Best Wishes > > Roberto > > > On Wed, Apr 4, 2012 at 00:53, Roberto Carvalini <[email protected]>wrote: > >> 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 >>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> > >
