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(Generator modeling – slide #36) ̅
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( ̅ ) ̅
̅ ( ̅ ̅ ̅) ̅ ̅ (Generator modeling – Slide #44)
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19’
d
() ⁄ ⁄ () (
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4’ 4. Simplified synchronous machine models (15 points): Continuing with Question 1, assume that the
generator is operated with the armature terminal voltage at rated value and its steadystate outputs are
Pt=250MW and Qt=115MVAr. Neglect saturation and saliency (i.e. let Xq=Xd, X’q=X’d and X”q=X”d),
a. Calculate airgap torque Te in per unit and in Nm.
b. Calculate Eq for the simplified steadystate model, E” for the Voltage behind X” model and E’ for the
classic model.
c. Draw a phasor diagram showing phasors about these quantities: Et, It, jXsIt, RaIt, Eq, E’, jX’dIt, E” and
jX”dIt a (slide #52, Kundur’s Page 101)
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̃ ( ̅ ̅
̅ ) ∠ cos=0.9085
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6’
b
̃ ̃ ( )̃ ̃ ̃ ( )̃ ∠ ̃ ̃ ( )̃ ∠ ∠ 6’
c 3’...
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This document was uploaded on 03/14/2014 for the course ECE 522 at University of Tennessee.
 Spring '12
 Monica

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