… on the other hand, if you are not familiar with the code, you will have to spend some time becoming familiar with it before you attempt to modify the code to solve new problems. If there is a specific part of the code you are having trouble understanding, I’ll try to answer your questions. But, unfortunately, I do not have the time to create examples for people who want to solve modified problem formulations.
-- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Dec 10, 2013, at 4:21 PM, Nirav Shah <[email protected]> wrote: > Can you please show me an example? I am quite new to matpower. > > Sorry for troubling you every time. > > > On Tue, Dec 10, 2013 at 9:23 AM, Ray Zimmerman <[email protected]> wrote: > The power flow code in MATPOWER is pretty straightforward, so if you are > familiar with the details of the algorithms and become familiar with the > code, it should be quite possible. > > I suggest duplicating fdpf.m, for example, and making modifications to your > copy. > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Dec 9, 2013, at 10:18 PM, Nirav Shah <[email protected]> wrote: > >> Thank you very much sir. >> >> I have one more doubt. I am using newton-fast decoupled method to run a >> power flow. >> >> My work includes an extra column in Jacobian for (dp/dx) where x is for the >> frequency. >> >> Is it possible to add that column in Jacobain and run power flow to solve >> for dx as well? >> >> >> On Mon, Dec 9, 2013 at 2:38 PM, Ray Zimmerman <[email protected]> wrote: >> MATPOWER does not have a built-in option to minimize the flow of a specified >> line, but there are a few ways you could approach solving the problem … >> >> (1) Brute force, run an optimal power flow in a loop where you decrease the >> rating of the line in question at each iteration until the problem becomes >> infeasible. If your changes are small enough, the last feasible solution >> should be near the minimal flow in the line. >> >> (2) Use a DC OPF, and create a user-defined cost on the flow on the line in >> question. >> >> (3) Split the line in half, with a dummy bus in the middle. Split this dummy >> bus into 2 dummy buses (A and B) and put a generator at each to represent >> the flow. Constrain generation at A to equal the negative of generation at >> B, constrain voltages at A and B to be equal. Put a quadratic cost on the >> generators at A and B to force them toward zero. >> >> The first option is probably the least amount of work if it is a one-time >> simulation and the problem is small. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> B30 Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> On Dec 9, 2013, at 1:18 PM, Nirav Shah <[email protected]> wrote: >> >>> Hi all, >>> I want to minimize the power flow from a particular branch when I change >>> the load and run power flow/ optimal power flow again. >>> >>> Is it possible? Please reply as early as possible. >>> >>> Thank you. >>> >>> >> >> > >
