Dear Dr. Zimmerman, I have some questions about reactive power as considered as optimization variable:
- How the reactive power is controlled in MATPOWER and how it is considered in objective function? - What is the general regulatory context for reactive power bidding in an open market (I use runmarket of MATPOWER)? does it contribute to ancillary services? Best Wishes Carlos On Tue, Feb 7, 2012 at 19:39, Carlos Gonzalez Almeida < [email protected]> wrote: > Thank you so much. > > Best Wishes > > Carlos > > On Tue, Feb 7, 2012 at 18:39, Ray Zimmerman <[email protected]> wrote: > >> 1. If you have a specific MATPOWER question, I'll be happy to answer it, >> but I can't implement it for you you. My suggestion was to use MATPOWER's >> OPF as a subroutine for your own simple single variable greedy search >> optimization. >> >> 2. MATPOWER's OPF always treats generator reactive power injection as an >> optimization variable (constrained by QMIN, QMAX and possibly a trapezoidal >> capability curve, see Section 5.4.3 in the manual). If you a case *without* >> reactive power control, I suppose you could set QMIN equal to QMAX or >> something. >> >> 3. You will see evidence of Qg being included in the optimization >> variable x in most of the OPF related files (Tables D-8, D-9). Have a look >> at opf_setup.m, mipsopf_solver.m, opf_costfcn.m, opf_consfcn.m, for >> starters. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 419A Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> >> On Feb 6, 2012, at 4:49 PM, Carlos Gonzalez Almeida wrote: >> >> Dear Prof. Zimmerman, >> >> Thank you for help. >> >> 1. I care a single tap ratio for the slack bus only. Could you please >> help me to implement it in MATPOWER? >> >> 2. My mean about "Phi", is : Power Factor = Cos (Phi). I need PF as >> optimization variable in order to compare the results with and without >> reactive power control. If you have another solution for this, please let >> me know. >> >> 3. Could you please let me know in what .m file you have considered >> reactive power as optimization variable? what is the name of the m file in >> MATPOWER? >> >> Best Wishes >> >> C. G. Almeida >> >> >> >> >> On Mon, Feb 6, 2012 at 22:02, Ray Zimmerman <[email protected]> wrote: >> >>> Unfortunately, including a transformer tap ratio as an optimization >>> variable is not possible without major modifications. I would like to add >>> this some day, but no promises. If anyone has any good references on this >>> that would be appreciated. >>> >>> If it is a single tap ratio that you care about, it might be possible to >>> use some brute force greedy search that simply calls runopf iteratively >>> while adjusting the tap ratio in search of an improved solution. >>> >>> Regarding reactive power as an optimization variable, I'm not sure about >>> the "Phi" you are referring to. However, all reactive power injections from >>> generators are already optimization variables (see Qg in equation (5.5) in >>> the manual). >>> >>> -- >>> Ray Zimmerman >>> Senior Research Associate >>> 419A Warren Hall, Cornell University, Ithaca, NY 14853 >>> phone: (607) 255-9645 >>> >>> >>> >>> >>> On Feb 6, 2012, at 5:24 AM, Carlos Gonzalez Almeida wrote: >>> >>> Dear Dr. Zimmerman >>> >>> I want to use the tap of Transformer at slack bus as optimization >>> variable in MATPOWER? How can I do this? >>> >>> Also, how can I add reactive power as variable of optimization. In other >>> words, if I want to have "Phi" of cos Phi as optimization variable, how can >>> I add this? >>> >>> Best Regards >>> >>> Carlos >>> >>> >>> >> >> >
