I'm having some trouble with this question.

Three-phase salient-pole synchronous generator has the following constants in per unit on the machine kVA rating as a base (all resistances are neglected):

Xd = 1, Xd' = 0.35, Xd''=0.25, Xq = 0.6

Ea = 1.8<15°, Vterminal = 1<0°

- Compute power angle (δ), generator current magnitude (in pu) and phase angle (Ia<θ).

Now, the power angle is easy (just 15°) but I have no idea what equations I can use to fined the generator current. I'v been reading every text book I can fined and nothing really seems to fit. There just doesn't seem to be much information on this sort of thing.

What has given me the most promising results is:

E = Vt + Ia(Xd + Xq)

Ia = (E - Vt) / (Xq + Xd)

... but I have been told this is wrong

I'm guessing I have to do a phasor diagram and use some trig... but I cant see how it could be done with the given information.

Any help would be great,

thanks guys