These are derivatives of complex voltages with respect to voltage magnitudes
and angles. If you haven’t already, please see the MATPOWER Tech Note 2 "AC
Power Flows, Generalized OPF Costs and their Derivatives using Complex Matrix
Notation <http://www.pserc.cornell.edu/matpower/TN2-OPF-Derivatives.pdf>”
listed in the Documentation section of the MATPOWER home page, especially
section 3.
Hopefully, that will answer your question.
Ray
> On Mar 29, 2017, at 9:46 PM, Albert Sarnari <[email protected]> wrote:
>
> Dear Mr Zimmerman
>
> Could you please explain why the derivative of the voltage( dV/dVm or
> dV/dVa) results in a matrix form: diag(V./abs(V)), when V is a vector, as
> shown in dSbus_dV.m?
>
> I will appreciate your reply.
>
> Kind regards
>
> Albert
