thanks a lot professor Zimmerman yes I need to actually modify the problem formulation manually,I did it for power flow algoritm in MATHPOWER and it was successful,now I want to do it with OPF you said " we have a pure-Matlab version of the PDIPM solver in the works" how can I get it? I know what I need for modelling of FACTS devices,but this is very time consuming and I want to get best result,so I decided to spend my time for modifying the best algoritm(PDIPM) thanks for help me.but if it's possible to help me again,please tell me what do I do?which algoritm should I choose to start? thanks,thanks,thanks....
--- On Mon, 4/13/09, Ray Zimmerman <[email protected]> wrote: From: Ray Zimmerman <[email protected]> Subject: Re: modify_opf To: "MATPOWER discussion forum" <[email protected]> Date: Monday, April 13, 2009, 10:22 PM In order to modify the pdipmopf MEX file you would need the C language sources, which we have not make publicly available. The first question you need to answer is, how are the FACTS devices to be modeled? And how does that affect the overall problem formulation? Does it involve additional linear constraints? Modification of the existing non-linear constraints? If it's the former you can simply use the generalized formulation to add the constraints as described in the manual and the existing algorithms should be able to solve it without modification. If it is the latter, you will need to actually modify the problem formulation manually. In this case, I would suggest modifying the fmincon-based solver, since it is pure-Matlab. The fmincon algorithm is not suitable for large systems, but we have a pure-Matlab version of the PDIPM solver in the works that uses the same cost and constraint evaluation functions and it is able to handle large systems. The only difference is that it requires 2nd derivative information for all of the costs and constraints. Hope this helps, -- Ray Zimmerman Senior Research Associate 428-B Phillips Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Apr 12, 2009, at 3:27 AM, bahrami wrote: Dear professor Zimmerman i want to modify opf for modeling of FACTS devices i want to begin with "pdipmopf" algoritm 1- is it posible to modify this algoritm,thogh it's a mex file 2- is there any alternative algoritm to select for modify? 3-i think "pdipmopf" algoritm is the best algoritm for this,is'nt it? pleas help me to start this project thanks
