MATPOWER does not explicitly model a generation REDISPATCH problem, where your optimization variables are positive and negative deviations from a previous dispatch. However, you can still accomplish what you want by setting up the costs correctly and adding a constraint.
For the costs, simply define piece-wise linear costs that are zero at the initial dispatch point and positive for both negative and positive deviations from that point (slopes of -1 and 1) are fine. You also want to set PMIN = PMAX = generator dispatch for any generators whose dispatch you want to remain fixed. The equality constraint you specify must be re-written in terms of Pg2 and Pg4, not the delta variables. See chapter 7 (probably section 7.1) of the manual for details on how to add this. Ray > On Jan 29, 2015, at 1:34 AM, lavanya arubolu <[email protected]> wrote: > > Dear all, > My self Lavanya i want to mitigate congestion using generation > rescheduling technique using MATPOWER for that i considered 5bus system and > run power flow this solution gives me line 1-2 is overloaded this leads to > congestion so,i want to reschedule generation to mitigate congestion for > that i add user functions to the existing opf program for case5.m the user > functions are > subjected to<image.png><image.png> > <image.png> > where 0.47 is overload on line1-2 can any one please help me how to add the > above user functions so that the solution gives Pg1, Pg2 and Pg3.
