If the Automatic Voltage Regulator computed a positive error signal then how would that affect the stator's output voltage?

If the Automatic Voltage Regulator computed a positive error signal then how would that affect the stator's output voltage?

• A. The voltage would decrease
• B. The voltage would increase
• C. The voltage would stay the same
• D. The voltage would fluctuate

Answer: (A)

The Automatic Voltage Regulator maintains the generator’s terminal voltage by comparing the actual voltage to a fixed reference. In this definition, the error is actual minus reference. A positive error means the terminal voltage is higher than the desired setpoint. To bring the voltage back down toward the setpoint, the AVR reduces the rotor field excitation, which lowers the generated emf and, consequently, the stator voltage. So, a positive error causes the voltage to decrease. If the error were negative, the regulator would increase excitation to raise the voltage.

The Automatic Voltage Regulator maintains the generator’s terminal voltage by comparing the actual voltage to a fixed reference. In this definition, the error is actual minus reference. A positive error means the terminal voltage is higher than the desired setpoint. To bring the voltage back down toward the setpoint, the AVR reduces the rotor field excitation, which lowers the generated emf and, consequently, the stator voltage. So, a positive error causes the voltage to decrease. If the error were negative, the regulator would increase excitation to raise the voltage.