Dear Ray Zimmerman,
Thanks for your attention and suggestion. I think reading the manual more
will help me. But I never saw it before. Is this the latest feature for
version 3.1b2? Does 3.0b3 has this setting?
By the way, what do below settings mean?
38 - OUT_ALL_LIM, -1 control constraint info output
[ -1 - individual flags control what constraint info prints]
[ 0 - no constraint info (overrides individual flags) ]
[ 1 - binding constraint info (overrides individual flags)]
[ 2 - all constraint info (overrides individual flags) ]
39 - OUT_V_LIM, 1 control output of voltage limit info
[ 0 - don't print ]
[ 1 - print binding constraints only ]
[ 2 - print all constraints ]
[ (same options for OUT_LINE_LIM, OUT_PG_LIM, OUT_QG_LIM) ]
40 - OUT_LINE_LIM, 1 control output of line limit info
41 - OUT_PG_LIM, 1 control output of gen P limit info
42 - OUT_QG_LIM, 1 control output of gen Q limit info
Best Regards,
Wu Jun
2007/4/26, Ray Zimmerman <[email protected]>:
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
