Dear Ray Zimmerman,
OK, I understand. If the voltage limits are applied, please announce it.
Thanks a lot!
Yours sincerely,
Wu Jun
Unit: State Key Lab. of Power Systems,
Dep. of Electrical Engineering,
Tsinghua University, P.R. China.
Email: [email protected]
2007-04-27
2007/4/27, Ray Zimmerman <[email protected]>:
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 3.0.0release (
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
>
>
>
>
>
>
>
