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Hi folk,

Anyone knows what is the reference voltage for the exciter field voltage Efd? I'm trying to calculate Pelec two different ways but either of them can match the Pelec given by PSS/E. So I wonder if the Efd and Vbus are in different reference settings. Or there are some other reasons for this?
I provided the process for the calculation below: (Noted: All the angles are in absolute values)

1.

Pelec = EfdVbussin(rotor angle)/Xs.

2.

Pelec =real{ Efd*[cos(rotor angle) + jsin(rotor angle)] * conj (I)}

where

I = {Efd[cos(rotor angle) + jsin(rotor angle)] - Vbus[cos(bus angle) + jsin(bus angle)]} / jXs

Thank you , Eve. :)