I think it does make sense to include it, based on the way it enters into the relationship between real power flow and voltage angles. See the derivation of the DC power flow modeling in section 3.7 of the manual for the details.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Sep 28, 2011, at 8:08 AM, Cuong P Nguyen wrote: > Ray, > Since voltage magnitude is assumed to be 1.0pu in dc power flow and so GSF, > does it make sense to factor in off-norminal transformer taps in gsf > calculation? > Cuong > > On Sep 26, 2011 9:41 AM, "Ray Zimmerman" <[email protected]> wrote: > > Or ... > > > > 3. You can call the makePTDF function which will compute the shift factors > > for you directly (see section 4.4 in the manual). It essentially does what > > you suggest in number 1, but using makeBdc (which does not ignore tap) > > rather than makeB. > > > > -- > > Ray Zimmerman > > Senior Research Associate > > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > > phone: (607) 255-9645 > > > > > > > > > > On Sep 25, 2011, at 9:22 PM, Cuong P Nguyen wrote: > > > >> Ray, > >> > >> I understand there are two ways of calculating generation shift factor, > >> > >> 1. From makeB function, one could calculate the B prime matrix( Bp), then > >> one can remove the row/column associated with the reference bus. THE > >> TRANSFORMER TAP IS IGNORED while Bp is formed. Therefore, we can compute > >> the flow on the lines by injecting 1 MW at a bus i by Bp\dP where dP(i)=1 > >> only at bus i, zeros everywhere else, this flow is called generation shift > >> factor. > >> > >> 2. We repeat the procedure above by setting 1MW injection at bus i, the > >> injection at all other buses set to 0. Then call rundcpf, we could end up > >> with the line flow which we is essentially generation shift factor. But > >> the RUNDCPF DOES CONSIDER TAP. > >> > >> Which one is correct in calculating generation shift factor? > >> > >> Thanks > >> Cuong > > >
