Dear Ray,
Thanks very much for your help!
As you said that in the PF calculation, changing Pg or Vm for the PV buses
will change the results. But I am not sure how to change the value of Vm in
Matpower data. For example, in case30, if I change the Vm of a PV bus,bus
no.2,(the value in bus_matrix of bus(2,8)), I think the results are supposed to
change. However, with the 'runpf('case30')' program in Matpower, the results do
not change. So, how can I get the different results based on the changes of
Vm(s) for the PV buses with Matpower?
Thanks again!
Have a nice day!
Regards!
Quoting Ray Zimmerman <[email protected]>:
>
> On May 5, 2008, at 12:28 PM, [email protected] wrote:
>
> > I have some confusion about the output of the generator's
> > reactive power
> > Qg. In the power flow calculation with Matpower, if I change the Qg,
> > for
> > example in case30 Qg2(the 2nd column,the 3rd row of the gen Matrix),
> > it is
> > supposed that the results will change. But they don't. I think the
> > reason is
> > that in the calculation we do not calculate ÄQ2,because bus 2 is a
> > PV bus, so
> > we just calculate ÄV2. So the changes of Qg will not change the
> > results. Am I
> > right?
>
> I think you mean row 2, column 3 of the gen matrix, right? You are
> correct that it is a PV bus, so P and V are specified (in columns 2
> and 6 of the gen matrix) and Qg and the voltage angle are computed by
> the PF. So changing the initial value of Qg or the voltage angle will
> not change the solution. Changing Pg or V will.
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