In order to change the voltage setpoint of a PV bus you change the VG
column (col 6) in the gen matrix.
Ray
On May 6, 2008, at 6:18 PM, [email protected] wrote:
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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