With more details I want to do runmarket and I want to have PF=0.85 for example in case9 for generators 2, 3. How can I do it?
Best Wishes C. Gonzalez Almeida On Mon, Mar 14, 2011 at 17:10, Carlos Gonzalez Almeida < [email protected]> wrote: > Thank you. > > I also have the Roberto's problem as well as in the case of runmarket to > set an specified power factor for generators except slack bus. > > If it is possible please give an example. Because it can be useful for > other people who will use in the future MATPOWER. > > Best Wishes > > C. Gonzalez Almeida > > > On Mon, Mar 14, 2011 at 16:59, Ray Zimmerman <[email protected]> wrote: > >> 1. You can constrain a generator to have a zero power factor by setting >> PMIN = PMAX = 1. The generator reactive power is one of the optimization >> variables in *x*, so it's value is determined by whatever solver you >> happen to be using, MIPS by default. So I suppose if you need to know which >> m-file computes its value, it would be mips.m. If you want to set the >> reactive power of generator 2 to zero, simply set both the QMIN and >> QMAXcolumn in the corresponding row of the >> gen matrix to zero (by the way, that is a power factor of 1, not 0). >> >> Without more details I have no idea. Are you passing in any reactive power >> offers? >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: <%28607%29%20255-9645>(607) 255-9645 >> >> >> >> On Mar 14, 2011, at 6:17 AM, Carlos Gonzalez Almeida wrote: >> >> Dear Prof. Zimmerman >> >> 1.I studied the your response to Roberto Carvalini but I don't know how >> can I define the PF for other generators to zero or other values when I do >> runmarket and it doesn't work the code when I do runmarket. By which formula >> you have computed the generator reactive power (in which m.file, please >> address the m.file because I couldn't find it). For example, if I want to >> set reactive power of generator 2 to zero, what should I do? >> >> 2. Why I cannot do runmarket for case30Q and case9Q? what is the reason? >> >> >> Best Wishes >> >> C. Gonzalez Almeida >> >> >> On Fri, Mar 11, 2011 at 16:29, Ray Zimmerman <[email protected]> wrote: >> >>> See my response to Roberto Carvalini, posted only seconds ago. Am I fast >>> or what? ;-) >>> >>> -- >>> Ray Zimmerman >>> Senior Research Associate >>> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >>> phone: <%28607%29%20255-9645> >>> <%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645>(607) >>> 255-9645 >>> >>> >>> >>> On Mar 11, 2011, at 10:16 AM, Carlos Gonzalez Almeida wrote: >>> >>> Thank you very much. >>> >>> Could you please give me an example about defining power factor for >>> generators? >>> >>> I cannot set it. >>> >>> On Fri, Mar 11, 2011 at 16:09, Ray Zimmerman <[email protected]> wrote: >>> >>>> Carlos, >>>> >>>> If you want the loads to have a power factor of 0.95, you need to set QD >>>> such that PD/sqrt(PD^2 + QD^2) = 0.95, i.e. QD has to equal 0.108 * PD. >>>> About the voltage constraint of 1.5 p.u., I don't see that anywhere, so I'm >>>> not sure what you are referring to. The different lambdas at the two buses >>>> are due to losses. The power factor of the generators is determined by the >>>> solution algorithm within the bounds set for them. That is, each generator >>>> has a feasible "box" defined by PMIN, PMAX, QMIN and QMAX. You don't >>>> normally "set" the power factor of a generator as input to the OPF. I >>>> suppose, if for some reason you have a strict power factor constraint on a >>>> generator you could use some additional linear constraints to the OPF to >>>> enforce it, but that would be unusual I think. >>>> >>>> -- >>>> Ray Zimmerman >>>> Senior Research Associate >>>> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >>>> phone: <%28607%29%20255-9645> >>>> <%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645>(607) >>>> 255-9645 >>>> >>>> >>>> >>>> On Mar 10, 2011, at 8:10 AM, Carlos Gonzalez Almeida wrote: >>>> >>>> Another question is this: when I have not fixed loads only I have >>>> dispatchable loads how can I define power factor for generators and loads >>>> separately? >>>> >>>> Best Wishes >>>> >>>> Carlos >>>> >>>> On Thu, Mar 10, 2011 at 13:53, Carlos Gonzalez Almeida < >>>> [email protected]> wrote: >>>> >>>>> Dear Prof. Zimmerman >>>>> >>>>> Thanks a lot for your useful guidance. >>>>> >>>>> For example, in the attached file for a simple case study with 2 loads >>>>> and generators I want to have a power factor 0.95. I have problem with >>>>> adjusting power factor in MATPOWER. How can I do it in the attached file? >>>>> Also I don't know why I have voltage constraint 1.5 pu. I think because of >>>>> these constraints I have a little bit difference in the value of lambda >>>>> I have done runmarket with the following offers and bids. >>>>> Could you please tell me why? >>>>> >>>>> +++++++++++++++++++++ >>>>> mpc0 = loadcase('case4gs1'); >>>>> mpc = load2disp(mpc0); >>>>> mkt.OPF = 'AC'; >>>>> offers.P.qty = [100;70]; >>>>> offers.P.prc = [50;100]; >>>>> bids.P.qty = [50 ;70 ]; >>>>> bids.P.prc = [150 ;130 ]; >>>>> [r, co, cb] = runmarket(mpc, offers, bids, mkt); >>>>> co.P.qty >>>>> co.P.prc >>>>> cb.P.qty >>>>> cb.P.prc >>>>> ++++++++++++++++++++++++ >>>>> >>>>> Best Wishes >>>>> >>>>> C. Gonzalez Almeida >>>>> >>>>> >>>>> >>>>> On Wed, Mar 9, 2011 at 19:47, Ray Zimmerman <[email protected]> wrote: >>>>> >>>>>> Carlos, >>>>>> >>>>>> I'm not sure what you mean by "test the example ... regarding zero >>>>>> power factor". If you are going to change some of the existing >>>>>> dispatchable >>>>>> loads to have a zero power factor, then the existing market structure for >>>>>> the example, which includes only $/MW bids for active power, will not be >>>>>> applicable. So you need to decide how you want to handle these >>>>>> reactive-only >>>>>> loads. I suppose you'll need to specify reactive power bids for them. >>>>>> >>>>>> On your second question, the offers and bids are used to construct a >>>>>> gencost matrix with negative costs for the negative generators that >>>>>> represent dispatchable loads. The objective function is then to minimize >>>>>> this "cost" of generation, which is computed in opf_costfcn.m. You >>>>>> are correct that this is equivalent to maximizing social welfare. >>>>>> >>>>>> -- >>>>>> Ray Zimmerman >>>>>> Senior Research Associate >>>>>> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >>>>>> phone: <%28607%29%20255-9645> >>>>>> <%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645>(607) >>>>>> 255-9645 >>>>>> >>>>>> >>>>>> >>>>>> On Mar 8, 2011, at 5:04 PM, Carlos Gonzalez Almeida wrote: >>>>>> >>>>>> Dear Dr. Zimmerman >>>>>> >>>>>> -Could you please test the example provided in the manual >>>>>> (t_auction_case) regarding zero power factor. What changes should be >>>>>> carried >>>>>> out? >>>>>> >>>>>> -Moreover, as you know, the objective function obtained in the >>>>>> runmarket is Social welfare. Could you please address me the file that >>>>>> you >>>>>> calculated objective function because I couldn't find it. I want to >>>>>> know in >>>>>> which file (the m file) you have calculated that? >>>>>> >>>>>> Best Regards >>>>>> >>>>>> Carlos >>>>>> >>>>>> >>>>>> >>>>>> On Tue, Mar 8, 2011 at 22:34, Ray Zimmerman <[email protected]> wrote: >>>>>> >>>>>>> I'm not really sure without seeing the details of your example. I'm >>>>>>> not sure I've ever tested the runmarket code with pure reactive >>>>>>> power loads. It would require reactive power bids for those loads, but >>>>>>> I'll >>>>>>> need the details to be able to help you further. >>>>>>> >>>>>>> -- >>>>>>> Ray Zimmerman >>>>>>> Senior Research Associate >>>>>>> 211 Warren Hall, Cornell University, Ithaca, NY 14853 >>>>>>> phone: <%28607%29%20255-9645> >>>>>>> <%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645><%28607%29%20255-9645>(607) >>>>>>> 255-9645 >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mar 7, 2011, at 10:42 AM, Carlos Gonzalez Almeida wrote: >>>>>>> >>>>>>> Hi >>>>>>> >>>>>>> I am new in MATPOWER abd I want to have zero power factor for example >>>>>>> in example case of manual in runmarket, but several error are occured. >>>>>>> please tell me why >>>>>>> >>>>>>> >>>>>>> Best Wishes >>>>>>> >>>>>>> C. Gonzalez Almeida >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> Best Wishes >>>>>> >>>>>> C. Gonzalez Almeida >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >>> Best Wishes >>> >>> C. Gonzalez Almeida >>> >>> >>> >> >> >> >
