HI
If i want to use a different objective function in AC-OPF where should i
modify the code.
please help me...
Thanking you sir
On Thu, Dec 23, 2010 at 10:24 PM, Ray Zimmerman <[email protected]> wrote:
> You should not need to use add_costs. I would suggest using a small
> constant positive cost for all of the original generators (though zero
> should work). I'm not sure I've ever tested it, but I believe a polynomial
> cost for the dispatchable loads should work just fine.
>
> --
> Ray Zimmerman
> Senior Research Associate
> 211 Warren Hall, Cornell University, Ithaca, NY 14853
> phone: (607) 255-9645
>
>
>
> On Dec 23, 2010, at 3:58 AM, jrwang wrote:
>
> >
> > Dear All,
> >
> > I want to model load curtailment based on AC-OPF by using dispatchable
> load. And the objective is to minimize the total amount of active
> load(deltaPd) curtailed.
> >
> > Do I need to modify the objective using the add_costs methods? Or only
> set the cost coefficients of original generators to be zero?
> >
> > Another question is: can the negative generator (dispatchable load) use
> polynomial cost?
> >
> > Thanks!
> >
> > ----------------
> > Jingran Wang
> > PhD candidate
> > Key laboratory of Smart Grid, Ministry of Education
> > Tianjin University
> > Tianjin,300072
> > China
> > Work: +86-022-27404221
> > E-mail: [email protected], [email protected]
> >
> >
> >
> >> From: Ray Zimmerman <[email protected]>
> >> Reply-To: "MATPOWER discussion forum" <[email protected]>
> >> To: MATPOWER discussion forum <[email protected]>
> >> Subject: Re: load shedding
> >> Date:Mon, 1 Nov 2010 13:52:56 -0400
> >>
> >> Yes. Either method works for AC OPF.
> >>
> >> --
> >> Ray Zimmerman
> >> Senior Research Associate
> >> 211 Warren Hall, Cornell University, Ithaca, NY 14853
> >> phone: (607) 255-9645
> >>
> >>
> >>
> >> On Oct 31, 2010, at 2:40 AM, jrwang wrote:
> >>
> >>>
> >>> Are the same techniques suited for load shedding in AC-OPF considering
> voltage constraints?
> >>>
> >>> Thanks!
> >>>
> >>>> From: Ray Zimmerman
> >
> >>>> Reply-To: "MATPOWER discussion forum"
> >
> >>>> To: MATPOWER discussion forum
> >
> >>>> Subject: Re: load shedding
> >>>> Date:Fri, 29 Oct 2010 12:01:46 -0400
> >>>>
> >>>> Both techniques work. You can do as you suggest and simply add a high
> cost generator next to the load . Or you can do as Carlos suggests and
> replace the load with a dispatchable load at a high price. See section 5.4.2
> in the manual for more details.
> >>>>
> >>>> One advantage to the latter is that as the load sheds it maintains a
> constant power factor.
> >>>>
> >>>> --
> >>>> Ray Zimmerman
> >>>> Senior Research Associate
> >>>> 211 Warren Hall, Cornell University, Ithaca, NY 14853
> >>>> phone: (607) 255-9645
> >>>>
> >>>>
> >>>>
> >>>> On Oct 29, 2010, at 12:21 AM, Mehdi wrote:
> >>>>
> >>>>> Hi there,
> >>>>>
> >>>>> Can anybody help me with how can I consider load shedding in
> MATPOWER's dc-opf ?
> >>>>>
> >>>>> Can I model load shedding as active power only generator (Pg=0,
> Pgmax=Load at that bus, Qg,Qgmax=0) at load buses? Then by running the
> dc-opf the output of these generator can be considered as load shedding!!!
> >>>>>
> >>>>> Regards,
> >>>>> Daniel
> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >>
>
>
>
>
--
