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Automatic generation control(AGC) controls
Frequency
Steam/Water input
Torque
All of these
Frequency
Automatic Generation Control (AGC) is a primary control mechanism in power systems designed to maintain the nominal system frequency at its rated value (e.g., 50 Hz in India). It achieves this by adjusting the real power output of generators in response to changes in system load, thereby balancing power generation and demand.
Automatic Generation Control (AGC) is a primary control mechanism in power systems designed to maintain the nominal system frequency at its rated value (e.g., 50 Hz in India). It achieves this by adjusting the real power output of generators in response to changes in system load, thereby balancing power generation and demand.
╬ФPmechтАЛтИТ╬ФPelecтАЛ=J╧Йdtd╧ЙтАЛ тАФ swing equation relating power imbalance to frequency/speed change
╬Фf=тИТRтЛЕ╬ФP тАФ relationship between frequency deviation and power change with regulation constant R
The principle relies on the frequency-power relationship. When load demand increases, the kinetic energy of the rotating generator rotors is extracted to meet the load, causing the frequency to drop. The AGC detects this deviation (╬Фf) and sends signals to the governor/turbine control systems to increase or decrease steam or water input, adjusting mechanical power output to match electrical demand.
AGC is a closed-loop system that performs Load Frequency Control (LFC).
It maintains the balance between real power generation and demand.
It minimizes frequency deviations and tie-line power flow errors.
It acts on the primary speed control of the turbine generator sets.
Ensures frequency stability within tight tolerance bands.
Prevents equipment damage from off-nominal frequency operation.
Coordinates multiple generating units to share load economically.
Requires high-speed communication infrastructure for interconnected operation.
Can be influenced by slow primary response of thermal units.
Interconnected power grids (Synchronous Grids).
Automatic balancing of fluctuating renewable energy sources like wind and solar.
The 'control' acts on the prime mover (steam/water) to adjust mechanical power, but the primary goal being satisfied is Frequency regulation.
Options B and C (Steam/Water and Torque) are mechanisms/means used to achieve the objective of Option A (Frequency).
A is correct тАФ Automatic Generation Control is specifically designed to regulate frequency by maintaining a balance between real power generation and load demand.
Remember that AGC is for real power (frequency) balance, whereas Automatic Voltage Regulation (AVR) is for reactive power (voltage) balance.