Thank you very much! Cheers, Ronald
On Sat, Oct 14, 2023 at 1:33 AM Ray Daniel Zimmerman <[email protected]> wrote: > That’s correct. Except, if you are zeroing out all other costs, there is > no need to use such a huge magnitude for the cost. Any reasonable non-zero > number would do (like 10 or 100). When the problem includes coefficients > with huge ranges it can potentially result in numerical issues. > > Ray > > On Oct 12, 2023, at 6:26 PM, Ronald Cabaoig <[email protected]> wrote: > > Hi sir, > > Thanks for the suggestion! > > Let me confirm my understanding: > 1. Create a dummy generator with the following limits: -99999 MW <= Pdummy > <= 99999 MW > 2. To minimize the injection, set a very large positive cost coefficient > (C = 99999Pdummy) and zero out all other costs, turning the objective > function to: min (99999Pdummy + 0Pg1 + 0Pg2 + ...) > 3. To maximize the injection, set a very large negative cost coefficient > (C = -99999Pdummy) and zero out all other costs, turning the objective > function to: min (-99999Pdummy + 0Pg1 + 0Pg2 + ...) > 4. Retain all other information > > Thanks in advance! > > Cheers, > Ronald > > > On Tue, Oct 10, 2023 at 5:23 AM Ray Daniel Zimmerman <[email protected]> > wrote: > >> You can do this by placing a dummy generator at the bus of interest and >> using a very large negative (to maximize the injection) or positive (to >> minimize the injection) generation cost. You can either zero out all other >> costs, or simply make the magnitude of the cost large enough to dominate >> all other costs. >> >> Ray >> >> >> > On Oct 5, 2023, at 8:48 PM, Ronald Cabaoig <[email protected]> wrote: >> > >> > Dear MATPOWER team, >> > >> > Greetings! >> > >> > In the current MATPOWER version, is it possible to reformulate the >> objective function to find the maximum positive (and negative) power >> injection in a certain bus: >> > >> > Maximize the positive power injection in bus X (or could also be: >> minimize the negative power injection in bus X) >> > Subject to the AC power flow equations, branch flow limits, generator >> output limits, voltage limits. >> > >> > The main decision variable in this case would be the power injection in >> bus X. Other values that could vary are the generator outputs, voltages, >> and the like (all subject to the constraints). >> > >> > Cheers, >> > Ronald >> >> >> >> >
