You can simply create a new mpc for each time period, each one as modified version of some base case.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On May 31, 2012, at 12:49 PM, iman wrote: > Dear Carlos, > Thank you for your code regarding flexible demand. > How do u implement your code if you have the load profile in 24 hours?For > example from 6 am to 2 pm 100% load, from 2 pm to 10 pm 80% load and from 10 > pm to 6 am next day 60% load. > Best regards > Iman > > On Fri, May 18, 2012 at 9:01 PM, Carlos E Murillo-Sanchez > <[email protected]> wrote: > There is a rather flexible utility in matpower for scaling loads. Type > >> help scale_load > > at the matlab prompt for help on how to use it. Otherwise, if you just want > to modify inflexible demand, > you could do something like > > mpc = loadcase('case118'); > define_constants; > Nominal_PD = mpc.bus(:, PD); > Nominal_QD = mpc.bus(:, QG): > for factor = 0.8:0.01:1.20 > mpc.bus(:, PD) = factor * Nominal_PD; > mpc.bus(:, QD) = factor * Nominal_QD; > results = runpf(mpc); > % now insert code here to do whatever you want to do with the results > your code.... > more code... > end > > This scales inflexible demand in the system by a factor from 80% of nominal > to 120% of nominal in 1% increments and runs a power flow; you could run also > an optimal power flow using runopf() instead. The load is scaled > maintaining a constant power factor. > > > > > > Hanie Sedghi wrote: > Dear Sir, > > I would like to have different voltage angle values at different times for a > structure. Let's say I want to have the same structure as case9, but I want > to know what are the values at different times. It is like simulating a grid > and taking samples at different times. For that I think I need different > demands. Then I checked the case file and thought I need to put random Pg's > in "gen" matrix. Am I right? Shall I generate random values in [Pmin,Pmax] > interval? > I have another question, in case9, for bus 1, Pg=0 while Pmin=10. Is it > correct? Can Pg be less than Pmin? In that case,what do we mean by Pmin? > > I would truly appreciate your help. > > Best, > Hanie > > > > > > -- > Best regards > Iman >
