> Hi, I have a question about Matpower 4.0
>
> By running" runpf('case9') " I get the power flow of the 9-bus system.
> If I change baseMVA from 100 to 1000 or 10 in file 'case9.m',
> the results of power flow do change completely! Why?
> Is this because the r, x and b columns are expressed by p.u.-values?
> If so, how do I have to transform them in order to receive the same
> results as before? How do I choose a baseMVA value for an unknown
> System?
> Thanks very much
>
Well,
If you want to change your MVA base and/or voltage base, all the
pu impedances must be changed accordingly by:
Znew(pu) = Zgiven(pu)((KVgiven/kVnew)^2)(kVAnew/kVAgiven)
I hope it helps.
Prof. J.R. Camacho
UFU - School of Electrical Engineering
Uberlandia - MG - Brazil
[email protected]
