Bus Parameters of Generator

[reid-g]

The BusPV depends on the parameter Pg for creation. Currently under the BusData does not contain Pg. This will need to be added or setup as separate input. However, the parameter generally comes from a generator. Then the parse will need to be updated for this as well.

[pelesh]

I think BusPV should neither have nor try to set parameter Pg. This is now responsibility of GeneratorPV.

Also, the residual evaluation seems to be incorrect:

template <class ScalarT, typename IdxT>
int BusPV<ScalarT, IdxT>::evaluateResidual()
{
    P() = Pg_;
    Q() = 0.0;
    return 0;
}

The residual P() should be initialized to zero here. The PV generator and other components should then add their contributions to P(). The Pg_ parameter seems to be remnant of the PV bus model that had embedded generator in it.

[reid-g]

So then is the BusPV supposed to reset the residuals to 0 and the GeneratorPV supposed to add the P_ value? Or is the generator supposed to be an assignment too?

[pelesh]

The system model is designed to loop over buses first and then over all components. Buses initialize residuals to zero and looping over components then computes the residuals. BusPV has voltage magnitude fixed, so it solves only equation for the voltage phase. The corresponding residual is the one for active power P.

What is slightly confusing in this implementation is that the output Q is computed together with residual(s). Here Q is the reactive power that GeneratorPV needs to provide in order to keep voltage magnitude at V_. It is a residual in a physical sense but in the computational context, it is simulation output.

[pelesh]

So then is the BusPV supposed to reset the residuals to 0 and the GeneratorPV supposed to add the P_ value? Or is the generator supposed to be an assignment too?

Yes, you are correct, GeneratorPV is supposed to add the Pg value to the residual P() on BusPV.