GATE EE 2024 Set 1 — Question 47

MSQ+2 / -0MediumVoltage & Frequency ControlEconomic Operation & CompensationPower SystemsLoad Frequency Control

Power Systems → Economic Operation & Compensation → Load Frequency Control

Last updated 5 September 2026

Question

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

Correct answer (B) AGC response has a global effect on frequency while AVR response has a local effect on voltage.; (D) AGC regulates the generator’s mechanical power input while AVR regulates the field current of the synchronous generator. Solution 1. AGC (Automatic Generation Control): Frequency is a global parameter in an interconnected power system. Therefore, any change in generation to control frequency has a global effect. AGC achieves this by regulating the mechanical power input to the generator via the governor system. 2. AVR (Automatic Voltage Regulator): Voltage is a local parameter because it is heavily influenced by local reactive power balance and line impedance. AVR maintains terminal voltage by regulating the field current (excitation) of the synchronous generator. Thus, options (B) and (D) are correct. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) AGC response has a global effect on frequency while AVR response has a local effect on voltage.; (D) AGC regulates the generator’s mechanical power input while AVR regulates the field current of the synchronous generator. Solution 1. AGC (Automatic Generation Control): Frequency is a global parameter in an interconnected power system. Therefore, any change in generation to control frequency has a global effect. AGC achieves this by regulating the mechanical power input to the generator via the governor system. 2. AVR (Automatic Voltage Regulator): Voltage is a local parameter because it is heavily influenced by local reactive power balance and line impedance. AVR maintains terminal voltage by regulating the field current (excitation) of the synchronous generator. Thus, options (B) and (D) are correct.

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