Which of the following method can be used to control the reactive power output of a synchronous generator?
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Answer & Explanation
Correct AnswerB. Changing the excitation
Quick Explanation
For a synchronous generator connected to a strong bus, real power is controlled mainly by mechanical input, while reactive power is controlled mainly by field excitation. Increasing field current raises internal emf and generally increases reactive-power export. Hence option B.
Formula / Key Relation
Q control ↔ excitation/field current; P control ↔ prime-mover input
Detailed Explanation
Correct Answer
B — Changing the excitation
Concept and Reasoning
For a synchronous generator connected to a strong bus, real power is controlled mainly by mechanical input, while reactive power is controlled mainly by field excitation. Increasing field current raises internal emf and generally increases reactive-power export. Hence option B.
Calculation / Key Relation
Q control ↔ excitation/field current
P control ↔ prime-mover input
Exam Takeaway
Generator excitation is the primary reactive-power control.
Common Mistake
Do not use governor/mechanical input as the main reactive-power control variable.
Quick Trick
Generator excitation is the primary reactive-power control.
Common Mistake
Do not use governor/mechanical input as the main reactive-power control variable.
Exam Tip
Generator excitation is the primary reactive-power control.
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