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Unformatted text preview: ( ) (Generator modeling – slide #36) ̅ ̅ ̅ ̅ ( ̅ ) ̅ ̅ ( ̅ ̅ ̅) ̅ ̅ (Generator modeling – Slide #44) ( ̅ ) ̅ ̅ ̅ 19’ d () ⁄ ⁄ () ( ( )( )( ) ) ⁄ ⁄ ⁄ ( ( )( )( ) ) 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 steady-state 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 air-gap torque Te in per unit and in Nm. b. Calculate Eq for the simplified steady-state 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) ̅ ̅ ̅ ̃ ( ̅ ̅ ̅ ) ∠ cos=0.9085 ̅ ̅ ̅̅ ̅ 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.

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