On Apr 26, 2007, at 11:02 AM, Jun Wu wrote:
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?
This feature was added in 3.0b4 and was included in the final 3.0.0
release (3.0b4 was a beta version). It is also included in the beta
releases for 3.1.
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
These options control the constraint sections of the output for the
OPF solver only.
Ray
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
