By default, the power flow solver does not take into account the
voltage or reactive power limits. However [1] ...
For the AC power flow solvers, if the ENFORCE_Q_LIMS option is set to
true (default is false), then if any generator reactive power limit
is violated after running the AC power flow, the corresponding bus is
con- verted to a PQ bus, with the reactive output set to the limit,
and the case is re-run. The voltage magnitude at the bus will deviate
from the specified value in order to satisfy the reactive power
limit. If the generator at the reference bus is reaches a reactive
power limit and the bus is converted to a PQ bus, the first re-
maining PV bus will be used as the slack bus for the next iteration.
This may result in the real power out- put at this generator being
slightly off from the specified values.
[1] Taken from p. 10 of the User's Manual (http://
www.pserc.cornell.edu/matpower/manual.pdf).
--
Ray Zimmerman
Senior Research Associate
428-B Phillips Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Apr 26, 2007, at 5:23 AM, Wu Jun wrote:
Hi all,
From the case30.m in Matpower, Vmax and Vmin for buses are listed,
also the Qmax and Qmin for generators. I want to know how they work
during the process of calculating the power flow. If one of them
are violated, how does Matpower treat it? Does Matpower keep the
original outputs or change the calculation condition automatically
then put out a result without breaking any limit?
--------------
Yours sincerely,
Wu Jun
Unit: State Key Lab. of Power Systems,
Dep. of Electrical Engineering,
Tsinghua University, P.R. China.
Email: [email protected]
2007-04-26
