Dear Dr Ray, Thank you very much. Yes I was referring to radial network. By 'the total MVA flow' I am referring to MVA flow between any 2 nodes(say, i & j). I am trying to compute what will be the MVA flow through the branch given the branches values of PF, QF and PT, QT injections from the power flow results.
Idris >-----Original Message----- >From: [email protected] [mailto:bounce-32610422- >[email protected]] On Behalf Of Ray Zimmerman >Sent: 26 May 2011 17:32 >To: MATPOWER discussion forum >Subject: Re: total MVA flow in a branch > >I think you have to define "the total MVA flow in a branch". In the >standard branch model used in MATPOWER, there are losses in the branch, >so the flow at one end and the flow at the other are not equal, so there >isn't a single value of MVA flow that is *the* flow. The OPF flow limits >are based on the max of the two. Or you might want to use the average, >but certainly not the sum. > >I'm not sure what you mean by the "first branch" and the "source", >unless you are referring to a radial system with a single generator. In >that case, the P and Q flows at the end of the line connected to the >source should match the generation at the source (assuming there are no >shunt elements and loads at that bus). > > >-- >Ray Zimmerman >Senior Research Associate >211 Warren Hall, Cornell University, Ithaca, NY 14853 >phone: (607) 255-9645 > > > >On May 26, 2011, at 6:04 AM, Idris Musa wrote: > >> Dear all, >> How do I compute the total MVA flow in a branch? >> if >> >> MVA_flow_from = sqrt(results.branch(:, PF).^2 + results.branch(:, >QF).^2); >> >> and >> >> MVA_flow_to = sqrt(results.branch(:, PT).^2 + results.branch(:, >QT).^2); >> >> Can I add the 2 results above directly to give me the total flow in a >branch? If Yes then I expect that sum of the MVA flow in the first >branch when I run power flow should reflect the total generation from >the source. Else how do I go about it. >> I would glad if someone could put me through. >> Many thanks >> Idris >> >> >> > >
