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Power Systems
Power System Generation

Practice questions from Power System Generation.

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Q#1 Power System Generation GATE EE 2024 (Set 1) MSQ +2 marks -0 marks

Which of the following options is/are correct for the Automatic Generation Control (AGC) and Automatic Voltage Regulator (AVR) installed with synchronous generators?

AGC response has a local effect on frequency while AVR response has a global effect on voltage.

AGC response has a global effect on frequency while AVR response has a local effect on voltage.

AGC regulates the field current of the synchronous generator while AVR regulates the generator's mechanical power input.

AGC regulates the generator's mechanical power input while AVR regulates the field current of the synchronous generator.

Explanation:

AGC controls the steam input of the generator to regulate the power generated by the generating unit. But as soon as the output of one generating unit changes the output of other generating units must change to meet the load demand.

When the real power output of generating unit changes the frequency also changes as per droop characteristics and hence AGC has global effect of frequency.

AVR controls the excitation of a generating unit to maintain terminal voltage within specified limits. So AVR has local effect on voltage.