Hi Cody,
Whether you set the buses as PV or PQ will have no effect on the OPF, since
voltages are dispatched within the Vmin/Vmax range (unless you have the
'opf.use_vg' option set). For the power flow, on the other hand, it will
determine whether the voltage is kept at the setpoint (PV) or not (PQ).
If you have a single linear cost for each dispatchable load, I would just use
Model 2.
Ray
> On Dec 11, 2018, at 10:17 AM, Cody Rooks <[email protected]> wrote:
>
> Thanks Ray that's very helpful. I've got a couple quick follow-up questions
> if I may:
> Now that each bus is effectively a "generation source," will they only
> dispatch if I make them all PV buses (excluding ref bus)? I'd like them to
> dispatch economically within certain voltage bounds, but it is not necessary
> that they keep their respective bus voltages at 1 p.u.
> In terms of gencost, in the documentation I see that dispatchable load can be
> modeled as a negative piece-wise cost curve. Does this imply that for my
> dispatchable loads I will use Model 1 with negative cost slopes? (I only have
> one linear cost term by the way).
> Thank you,
>
> Cody
>
> On Mon, Dec 10, 2018 at 12:54 PM Ray Zimmerman <[email protected]
> <mailto:[email protected]>> wrote:
> In short, yes, to everything you are trying to do.
>
> I would personally put 2 generators at each bus (2 rows in the gen table with
> the same bus number), one for the distributed generation and the other to
> represent the dispatchable portio of the load. I’d combine the fixed portion
> of the load and the fixed injection from the solar PV (assuming it is not
> curtailable) into a net load number to put in the PD, QD columns of the bus
> matrix. No need to use the load2disp() function at all unless you find it
> useful just to initially create the entries in the gen and gencost matrices
> for you.
>
> Ray
>
>> On Dec 8, 2018, at 3:23 PM, Cody Rooks <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Hello,
>>
>> I'm sure the answers to these questions are buried somewhere between the
>> user manuals and the email archives, but I'm hoping that if I can clearly
>> define my problem here I may be able to get the information I'm after more
>> efficiently.
>>
>> I'd like to solve an ACOPF of the 33-bus distribution system that has
>> flexible demand at every bus except the root bus, and has some distributed
>> generation at certain buses. There will also be solar PV injections at
>> select buses. In other words, one bus could be composed of: fixed demand,
>> dispatchable demand, fixed generation and dispatchable generation.
>>
>> The solar I understand I can represent as a generation source with 0 cost
>> and defined, equal upper/lower bounds. I understand that I can place a DG
>> with the usual mpc.gen and mpg.gencost, and I know that I can change fixed
>> load to dispatchable via the load2disp() function.
>>
>> My questions are:
>> Can I have all three fixed generation, dispatchable generation and
>> dispatchable load at the same bus and, if so, how does one implement this in
>> MATPOWER's case structure?
>> Is it possible to have a portion of the load, as opposed to all of it, made
>> dispatchable? And if so, how would I implement this?
>> Thank you,
>>
>> Cody
>
