Re: Ybus-matrix

[Carlos E Murillo-Sanchez]

Hmm... that is an odd question.  Looking at the Kron reduction myself, I find that there are six off-diagonal elements with positive real parts, which would imply six "lines" in this 54 bus "network" with negative resistance.  I suppose that you could actually synthesize values for pi models that would give you the observed coefficients in the reduced matrix, but some of the parameters would not be physically possible. carlos. Philip Adedotun Olaniyi wrote: Thank you so much sir. My next question would be, is it possible to compute the bus and branch tables from the 54-by-54 admittance matrix? Thank you   From: bounce-120671035-76197...@list.cornell.edu [mailto:bounce-120671035-76197...@list.cornell.edu] On Behalf Of Carlos E Murillo-Sanchez Sent: Friday, August 05, 2016 11:10 AM To: MATPOWER discussion forum <matpowe...@list.cornell.edu>; MATPOWER-L@cornell.edu Subject: Re: Ybus-matrix   When you simplified away the PQ buses, you lost the ability to specify loads in them.  So, theoretically, you could perform a load flow in which you can only have loads at the 54 generator buses.  You cannot use runpf, though,  as runpf starts by building the Ybus matrix from the bus and branch tables; it does not take Ybus as an input.  You would have to call newtonpf.m directly with suitable parameters. carlos. Philip Adedotun Olaniyi wrote: Hi MATPOWER community,   I asked a question earlier and would like to modify it. I have a reduced 54-by-54 admittance matrix for case118. Can I use this as an input in MATPOWER for my power flow analysis? How do I go about it? I would appreciate your help. Thank you.