There is a book titled "Power Systems Analysis" by Charles Gross
that gives a sensitivity formula for tap and phase shift changes that you
need to apply at each iteration. I might have it somewhere.  Ray is right,
you could add it to Matpower without much coding.

Jovan



On Thu, Oct 24, 2013 at 2:52 PM, Ray Zimmerman <[email protected]> wrote:

> MATPOWER does not model *automatic* tap changers of transformers.
> However, you can change the taps manually and re-run the power flow or OPF.
> I suppose you could write your own algorithm to automatically adjust them,
> but MATPOWER doesn't do it for you.
>
> --
> Ray Zimmerman
> Senior Research Associate
> B30 Warren Hall, Cornell University, Ithaca, NY 14853
> phone: (607) 255-9645
>
>
>
> On Oct 24, 2013, at 11:43 AM, Rasool Jafari <[email protected]> wrote:
>
> Hello
> I have downloaded MATPOWER program recently and I am very happy to find
> this useful program, thank you for this valuable idea.
> I have a question about MATPOWER: Does this program model automatic tap
> changer of transformers? If not is there any solution to do that?
> Thanks a lot.
>
>
>
>
>

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