I'm sorry I've taken so long to respond. I think your best bet is
actually to just switch to one of the better OPF solver's supplied as
optional packages, such as MINOPF or TSPOPF.
Also, I'm not certain, but I believe that setting the upper and lower
voltage limits to Inf and -Inf, respectively will cause fmincon to
remove them from the problem.
--
Ray Zimmerman
Senior Research Associate
211 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Jul 30, 2009, at 7:38 AM, Arturo Daniel Alarcón Rodríguez wrote:
Prof. Zimmerman,
First of all, congratulations for providing Matpower as an open
source code, it is a helpful tool for research.
I am analyzing the integration of controllable Distributed
Generation on distribution networks, and using extensively the AC-
OPF (fmincon). It works very well with a small number of generators,
though, when the number of variables/constraints increases the
solution of the optimization problem becomes slow. I dealt with this
in previous times (using a radial network LP optimization) by
reducing the number of voltage constraints, and checking voltages
only at certain nodes of interest. Adjacent nodes will have similar
voltages.
Do you think it is possible to modify the OPF formulation to define
the buses in which voltages are to be check? Is so, I would really
appreciate you could guide me in which line of the OPF code should I
start.
Many thanks
Best regards
Arturo
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Dr. Arturo D. Alarcon-Rodriguez
Research Assistant
Institute for Energy and Environment
Department of Electronic and Electrical Engineering
University of Strathclyde
Royal College Building
204 George Street
Glasgow G1 1XW
Mobile: 07910 490 402
Email: [email protected]
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