EEE591Ch11

EEE591Ch11 - POWER SYSTEM CONTROLS 1 VOLTAGE REGULATOR Used...

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1 POWER SYSTEM CONTROLS
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2 G V t I a KI FD I FD X E REF + - ε VOLTAGE REGULATOR Used to control steady state voltage Can improve transient stability if it acts fast enough X d Without voltage regulator: V t = KI FD – I a jX d With voltage regulator: V t = KI FD – I a jX d But, I FD = G ε = G(E REF – V t ) = G(1 – V t ) V t = KG(1-V t ) – I a jX d = KG – KGV t - I a jX d V t (1+KG) = KG – I a jX d KG jX I KG KG V d a t + - + = 1 1 For KG >> 1 KG X j I V d a t - = 1
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3 Line 1 Line 2 System P E Bus B Bus A X 3-Phase Fault KI FD + - VR I FD If voltage regulator has “high initial response” the internal voltage can increase fast enough to increase P E and enhance transient stability. X E REF + - E t 1 1 + s T R 1 + s T K E E 1 1 + s T F ε E FD I FD VOLTAGE REGULATOR Reg Exc Field Voltage Regulator
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4 High initial response excitation system increases field excitation rapidly so that when the fault is cleared P E is at a higher value thereby increasing A 2 which results in additional power transmission capability δ P E P E0 = P δ 0 δ C δ 2 A 1 A 2
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f R P P REF M - = 1 Governor Generator
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This note was uploaded on 02/21/2010 for the course EEE ??? taught by Professor Farmer during the Spring '10 term at ASU.

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EEE591Ch11 - POWER SYSTEM CONTROLS 1 VOLTAGE REGULATOR Used...

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