Regarding your last question. You are correct. Unless you want an explicit cost
on a newly added variable, there is no need to add any cost. The objective of
minimizing the generation cost will still be valid, just constrained in new
ways by your user-defined constraints and variables.
Ray
> On Mar 22, 2019, at 9:57 PM, Jubeyer Rahman <[email protected]> wrote:
>
> I am sorry, please ignore the first two questions.
>
> On Fri, Mar 22, 2019 at 12:47 PM Jubeyer Rahman <[email protected]
> <mailto:[email protected]>> wrote:
> Hi,
>
> I was trying to understand the documentation for extending the OPF in section
> 7, when I came across the code for adding reserves on page 86, I got kind of
> confused regarding the addition of linear constraints. I have several
> questions regarding that,
>
> a. How to define the 'Pg_plus_R' thing which refers to equation 7.4, should I
> write an equation using the 'syms' of matlab and it's not an equation with
> equal sign.
>
> b. I don't see how this incorporation of reserve affect the real power
> column(at least in the code snippet), can you explain how does it affect? I
> was expecting to see some line like mpc.gen(:,PG)=mpc.gen(:,PG)+r or
> expecting something mpc.gen(:, Ramp_10)=r; but there is nothing similar there.
>
> c. In case of incorporating some variables which may not explicitly affect
> the objective function of OPF, how necessary is it to incorporate the cost in
> that case. To be precise, if I want to vary the shunt susceptance which
> affects the reactive power and might affect the real power, is it necessary
> to add some cost function to the objective of OPF. I guess since the OPF
> already takes care of real power cost, it is not necessary. Let me know if I
> am thinking correctly.
>
> Regards,
> Jubeyer
