Just that the sensitivities of the flows at either end of a branch can be different, given that there can be losses, off-nominal taps, phase-shifts, etc. I have no idea how significant (or insignificant) the differences are in general or for your specific case. Note: they should in general be of opposite sign, I believe.
Ray > On Jun 25, 2019, at 1:24 PM, Jubeyer Rahman <[email protected]> wrote: > > Hi Ray, > Sorry for raising the issue again regarding the AC-PTDF. > Unlike DC-PTDF, where it contains only the "from bus" sensitivity of flows , > why does AC-PTDF contains both from bus and To bus information? What are the > significance of it? > > Regards, > Jubeyer > > On Mon, Jun 24, 2019 at 5:25 PM Jubeyer Rahman <[email protected] > <mailto:[email protected]>> wrote: > Thank you very much. > > On Mon, Jun 24, 2019 at 5:24 PM Ray Zimmerman <[email protected] > <mailto:[email protected]>> wrote: > From a quick look at the code (remember, when in doubt, the code *is* the > documentation 😉), it seems each matrix contains the sensitivities of active, > then reactive, power flows to active, then reactive, injections. Hf is the > sensitivities of flows at the “from” ends of branches, Ht at the “to” end. > > Ray > > >> On Jun 24, 2019, at 11:59 AM, Jubeyer Rahman <[email protected] >> <mailto:[email protected]>> wrote: >> >> So, can you tell me what is Hf and what is Ht here in the code? And why the >> dimension is bigger than DC-PTDF matrix? >> And are you following the reference mentioned in the post to calculate >> AC-PTDF? >> >> -Jubeyer >> >> On Mon, Jun 24, 2019 at 9:29 AM Ray Zimmerman <[email protected] >> <mailto:[email protected]>> wrote: >> I don’t have anything more recent that the code you referenced. >> >> Ray >> >> >>> On Jun 17, 2019, at 10:28 AM, Jubeyer Rahman <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Hi Ray, >>> >>> I have come to know about the code of calculating AC-PTDF from this thread: >>> https://www.mail-archive.com/[email protected]/msg05924.html >>> <https://www.mail-archive.com/[email protected]/msg05924.html> >>> >>> While checking the t_makePTDFac which turned out to fail in the test cases >>> (apparent from the messages it producing). >>> >>> I would like to know whether there exists any robust code to calculate >>> AC-PTDF or not? >>> >>> Regards, >>> Jubeyer >> >
