MATPOWER’s OPF currently does not optimize transformer tap settings. In case 
you take Jovan’s suggestion, you may find the following document by Laurens 
Bliek saves you time regarding the sensitivities …

        http://arxiv.org/pdf/1311.5115v1.pdf

— Ray


> On Mar 4, 2015, at 7:50 AM, Jovan Ilic <[email protected]> wrote:
> 
> 
> Angelina, 
> 
> OPF formulation should not have a slack bus.  As far as I know, Matpower (v 
> 4.1) 
> opf does not optimize wrt tap and phase shifter settings.  You can always 
> derive 
> sensitivities wrt these settings and adjust them in an external loop. 
> 
> I hope this makes sense, 
> Jovan
> 
> On Tue, Mar 3, 2015 at 11:50 AM, angelina sirri <[email protected] 
> <mailto:[email protected]>> wrote:
> Hello matpower users,
> 
> I would be interested in implementing on load tap changers in an opf 
> calculation. I searched in the archive but I couldn't find a clear help. How 
> to change the tap in the transformer of the slack bus? Is it a change done in 
> the mpc file or should I modify runopf code? Any instructions and 
> clarifications would be valuable!
> 
> Kind Regards,
> Angelina
> 

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