Dear Dr.Zimmerman:
It is my pleasure to get your response! I find that even if we don't turn
off those generators whose reactive power is out of the limit, just only
adjusting their output to a reasonable value is also feasible. When we adjust a
generator, we run the power flow again, if we find there is a generator
exceeding the limit, we again adjust the output until the all generators'
reactive outputs are under the limit. No matter how, it is really a perfect
experience for me to get the response by yourself. When I see the matpoer code,
I am sur that I am one of your fans! Thank you very much!
------------------ ???????? ------------------
??????: "Ray Zimmerman";<[email protected]>;
????????: 2016??6??3??(??????) ????0:09
??????: "MATPOWER discussion forum"<[email protected]>;
????: Re: AC power flow question
If you look more carefully at the code (and the comments) you??ll see that the
generator is turned off temporarily in line 267, and the load is adjusted to
include the injection. Later in line 307, the process is reversed, turning the
generator back on. Without studying the code in more detail, I don??t remember
why it was done this way, but I suspect it has something to do with multiple
generators at a bus.
Ray
> On Jun 2, 2016, at 10:05 AM, ???? <[email protected]> wrote:
>
> Dear Sir/Madam,
> I have a question with the AC power flow calculation. In Matpower
> 5.1, when AC power flow is calculated, if the q_limt is used, as the manual
> states that "If any generator has a violated reactive power limit, its
> reactive injection is fixed at the limit, the corresponding bus is converted
> to a PQ bus and the power flow is solved again. This procedure is repeated
> until there are no more violations". Obviously, we can find that all
> generators violating the reactive power limit will be regared as PQ bus, then
> the power flow will be recalculated. However, when I opened the file runpf.m,
> I fund that the states of all generators violating the reactive power limit
> are set to be zero, that is, "gen(mx, GEN_STATUS) = 0";. That means the
> generation is turned off in the next power flow re-calculation. This isn't
> included in the manual. It seems unreasonable. So I want to know the reason
> why turn off all these generators.
