The PTDF is a linear sensitivity, so simply multiply by the size of your power increase.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Nov 1, 2012, at 5:42 AM, Xiang Lu <[email protected]> wrote: > Dear Dr. Zimmerman, > > I am trying to get the real power increase in some branches given some power > changes on generators, which is depend on the PTDF matrix. The confusing > thing is that, in the PTDF definition, the value in the PTDF matrix use "a > unit increase" as the magnitude. I would like to ask, how can I translate the > unit increase to a practical increase of power value. Thank you in advance. > > Best Regards, > Xiang Lu > > > 2012/11/1 Xiang Lu <[email protected]> > Dear Dr. Zimmerman, > > Thank you for your response. Another thing that is confusing me is about the > branch. I am not sure how should I observe the power flow changes, that is, > should I use the PTDF or LODF, or use the re-calculation of rundcpf, when > branches and generators are removed. Thank you. > > Best Regards, > Xiang Lu > > > > 2012/11/1 Ray Zimmerman <[email protected]> > You should not need to change baseMVA. If you are removing lines, you can > simply change the value in the BR_STATUS column to zero in the branch matrix. > If you are removing buses, you can simply comment out the corresponding row > in the bus matrix and any rows in the gen and branch matrices for equipment > connected to the bus you are removing. > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Oct 31, 2012, at 10:33 AM, Xiang Lu <[email protected]> wrote: > >> Dear all, >> >> I am a newbie in power system. I am trying to use "rundcpf" to >> simulate power flows in some test cases. Also, I may want to change >> the original topology of the test case, for example, removing one or >> two buses and corresponding branches, then recaculate the power flows >> still using "rundcpf". When recaculating the powr flow, I am not sure >> which parameters should be changed with the changed toplogy, for >> example, baseMVA. If so, how can I change the >> baseMVA. Thank you in advance. >> >> >> Best Regards, >> Xiang Lu >> > > >
