See sections 5.3 and 6 in the MATPOWER User's
Manual<http://www.pserc.cornell.edu/matpower/manual.pdf>.
--
Ray Zimmerman
Senior Research Associate
211 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Dec 23, 2010, at 12:14 PM, chinni ram wrote:
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]<mailto:[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]<mailto:[email protected]>,
> [email protected]<mailto:[email protected]>
>
>
>
>> From: Ray Zimmerman <[email protected]<mailto:[email protected]>>
>> Reply-To: "MATPOWER discussion forum"
>> <[email protected]<mailto:[email protected]>>
>> To: MATPOWER discussion forum
>> <[email protected]<mailto:[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
>>>>
>>>>
>>>
>>>
>>
>>
>>
--
