Thanks a lot to both of you!
Steffi
On 7 May 2018, at 18:30, Ray Zimmerman <r...@cornell.edu> wrote:
Of course … what he said.
Thanks, Carlos, for pointing Steffi to a much more sane solution to the
problem. I guess my brain isn’t working very well today. I knew there was a
simple way that just wasn’t coming to mind.
Ray
> On May 7, 2018, at 12:10 PM, Carlos E Murillo-Sanchez
> <ce.murillosanc...@gmail.com <mailto:ce.murillosanc...@gmail.com>> wrote:
>
> Actually, if it is just a linear cost on the absolute value of the reactive
> output of a generator, you can define a "V"-shaped piecewise linear cost for
> it using the standard piecewise linear cost capability.
>
> carlos.
>
> Ray Zimmerman wrote:
>> Adding another ng rows to the gencost matrix will apply a cost to the
>> reactive power, but not to the absolute value of the reactive power. And the
>> User-defined Costs as described in Sections 6.3.1 of the MATPOWER 6 User’s
>> Manual <http://www.pserc.cornell.edu/matpower/docs/MATPOWER-manual-6.0.pdf>
>> doesn’t help you here, though you could apply a quadratic cost, if that
>> would work for you.
>>
>> However, if it needs to be a linear cost on the absolute value, I think
>> you’re going to have to use the general non-linear cost capabilities in the
>> current development version of MATPOWER on GitHub. They are described in
>> Sections 6.3.3 and 7.2.2 in the new manual
>> <https://www.dropbox.com/home/work/latest-MATPOWER-manual?preview=MATPOWER-manual.pdf>.
>>
>> if you have more questions along the way, don’t hesitate to ask.
>>
>> Ray
>>
>>
>>
>>> On May 7, 2018, at 11:01 AM, Stefanie Aebi <aeber...@student.ethz.ch
>>> <mailto:aeber...@student.ethz.ch>> wrote:
>>>
>>> I am trying to set up an OPF problem where the objective function consists
>>> of
>>> - active power generation (Pg*cp, where Pg is generation and cp is cost)
>>> - reactive power generation (|Qg|*cq, where Qg is reactive generation and
>>> cq is cost)
>>>
>>> How do I get the absolute values for Qg into the objective function? Is
>>> there a way to hard-code the objective or is there a workaround that will
>>> end up charging the absolute values?
>>>
>>> Thanks for any hints.
>>> Best regards, Steffi
>>>
>>>
>>
>
