Hi Angie, As a simple answer to your question, result of OPF as you stated as ($5,298.69/h) is the total cost of all real power(P) generation (in your case 320MW). You can consider total generation as [ P_load (315 MW) + P_losses (4.95 MW) ]. In other words, MATPOWER only consider real power losses, NOT reactive power losses. However, that doesn't mean MATPOWER is not capable of considering reactive power losses. If you wish to have reactive power losses to be considered as well as real power losses, I strongly suggest you to read the manual. To sum up, MATPOWER (default) uses real power losses and real power demand only to compute operating cost. Regards.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *Gokturk Poyrazoglu* Teaching Assistant | Student Assistant Department of Electrical Engineering / The State University of New York at Buffalo 230V Davis Hall, Buffalo, NY 14260 *Phone *: (716) 239 - 8095 *E-mail* : [email protected] On Sun, May 4, 2014 at 9:26 PM, Angie Joaqui Rendon <[email protected]>wrote: > | System Summary > | > > ================================================================================ > > How many? How much? P (MW) Q (MVAr) > --------------------- ------------------- ------------- > ----------------- > Buses 9 Total Gen Capacity 820.0 -900.0 to > 900.0 > Generators 3 On-line Capacity 820.0 -900.0 to > 900.0 > Committed Gens 3 Generation (actual) 320.0 34.9 > Loads 3 Load 315.0 115.0 > Fixed 3 Fixed 315.0 115.0 > Dispatchable 0 Dispatchable -0.0 of -0.0 -0.0 > Shunts 0 Shunt (inj) -0.0 0.0 > Branches 9 Losses (I^2 * Z) 4.95 51.31 > Transformers 0 Branch Charging (inj) - 131.4 > Inter-ties 0 Total Inter-tie Flow 0.0 0.0 > Areas 1 > > The losses are listed separately, I want to know if OPF's result for the 9 > nodes system ($ 5,296.69 / h), includes both losses or only a type of > losses? > > > ------------------------------ > From: [email protected] > > Subject: Re: Reactive Losses Power Flow > Date: Fri, 2 May 2014 16:26:22 -0400 > To: [email protected] > > > Could you clarify the question? > > Ray > > On May 2, 2014, at 1:12 PM, Angie Joaqui Rendon <[email protected]> > wrote: > > Regards > > OPF result for the system of nine nodes ($ 5,296.69 / h), it considers > only the missing I^2*Z? > > Thanks > > ------------------------------ > Date: Mon, 28 Apr 2014 09:32:01 -0500 > Subject: Re: Reactive Losses Power Flow > From: [email protected] > To: [email protected] > > If your are running ACPF simply change that value and the limits: > > > from: > > 39 1000 78.4674 300 -100 1.03 100 1 1100 0 0 0 0 0 0 0 0 0 0 0 0; > to: > > 39 500 78.4674 300 -100 1.03 100 1 500 0 0 0 0 0 0 0 0 0 0 0 0; > > Those 500MW will be generated by the slack bus. > > > > > 2014-04-12 12:53 GMT-05:00 Mahmoud Abdallah < > [email protected]>: > > > dear sir > I use matpower 3.2 > > I use runpf on case 39 and I wish to limit power generated at bus 39 to > certain value how can I do that ? > > first guess for power generated from generator at bus 39 = 1000 MW > I wish to make it generate only 500 MW > > thank you in advance > > > > > *Eng. Mahmoud abdallahTeaching AssistantAin Shams UniversityFaculty of > Engineering* > On Friday, April 11, 2014 6:19 AM, Ray Zimmerman <[email protected]> wrote: > I assume you are referring to the “System Summary” part of the MATPOWER > output? > > > ================================================================================ > | System Summary > | > > ================================================================================ > > How many? How much? P (MW) Q (MVAr) > --------------------- ------------------- ------------- > ----------------- > Buses 9 Total Gen Capacity 820.0 -900.0 to > 900.0 > Generators 3 On-line Capacity 820.0 -900.0 to > 900.0 > Committed Gens 3 Generation (actual) 320.0 34.9 > Loads 3 Load 315.0 115.0 > Fixed 3 Fixed 315.0 115.0 > Dispatchable 0 Dispatchable -0.0 of -0.0 -0.0 > Shunts 0 Shunt (inj) -0.0 0.0 > Branches 9 Losses (I^2 * Z) 4.95 51.31 > Transformers 0 Branch Charging (inj) - 131.4 > Inter-ties 0 Total Inter-tie Flow 0.0 0.0 > Areas 1 > > > If so, please notice that series losses and the branch charging are listed > separately. So the total reactive loss in the line is the series loss minus > the branch charging injection. > > Ray > > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Apr 10, 2014, at 5:59 PM, Angie Joaqui Rendon <[email protected]> > wrote: > > Regards > > I am working with the module of power flow, and i want know if the > reactive losses that shows me the program considers the capacitive effects > of the lines?. > > I am comparing results with other malingerers and these do not coincide > with some results that gives me MATPOWER, and differ for the lines that > possess a high capacitive value. > > I appreciate the information that you can give me. > > >
