Marcelo, I assume that when you say "multi-period OPF" you are referring to more than simply running multiple single-period OPFs in sequence. I implemented a very basic mulit-period OPF prototype a few months ago with ramp limits restricting the change in generator dispatch from period to period. I did it by replicating the network (with new bus numbers) for each period, so that each period appears as an island in a single large network. Then you can apply constraints (such as ramp limits) across the islands Mine was a very basic prototype (not suitable for distribution) to demonstrate the idea and didn't take into account all of the possibilities for units being off-line in certain periods and things like that.
So that would be my approach to implementing a multi-period OPF in MATPOWER. -- Ray Zimmerman Senior Research Associate 211 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Aug 3, 2010, at 9:43 AM, Andreas Floss wrote: > Dear Marcelo, dear all, > > i'm working on the issue of "multi-period" OPF. Main steps towards a OPF > over time are: > > 1 Identify variables that change over time (Pdem, Pgen, Qdem, ...). > 2 Implement a loop (for or while) with the choosen amount of time steps. > 3 Choose inside the loop: > a) Assemble new OPF input matrices with additional dimension "time" > from old two dimensional matrices, > b) or manipulate values of input matrices (identified variables). > 4 Save OPF results either in result matrices or other data format. > > This is basically the way I did it. I would now prefer number 3b) > working with huge amounts of time steps (>35040) because of massive > overhead data. > > Hope this helps, > Andreas > > --- > Andreas Floss > Sustainable Electric Networks and Sources of Energy > Technical University of Berlin > > Elizondo, Marcelo A schrieb: >> Dear all, >> Could anybody tell me how to implemented a multi-period OPF in Matpower? >> I would appreciate if you can share your code with me. >> >> Thank you, >> Marcelo >> >> __________________________________________________ >> *Marcelo A. Elizondo, Ph.D.* >> Power System Research Engineer >> Pacific Northwest National Laboratory >> >> >> >> >
