A 100-MVA, 14.4-kV 0.8-PF-lagging, Y-connected synchronous generator has a negligible armature resistance and a synchronous reactance of 1.0 per-unit. The generator is connected in parallel with a 60- Hz, 14.4-kV infinite bus that is capable of supplying or consuming any amount of real or reactive power with no change in frequency or terminal voltage.

(a) What is the synchronous reactance of the generator in ohms?

(b) What is the internal generated voltage E_A of this generator under rated conditions? 

(c) What is the armature current I_A in this machine at rated conditions? 

(d) Suppose that the generator is initially operating at rated conditions. If the internal generated voltage E_A is decreased by 5 percent, what will the new armature current I_A be? 

(e) Repeat part (d) for 10, 15, 20, and 25 percent reductions in E_A. 

(f) Plot the magnitude of the armature current I_A as a function of E_A. (You may wish to use MATLAB to create this plot.)

 

 

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Status NEW Posted 07 Jun 2017 07:06 AM My Price 8.00

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