What is use of avr in excitation control system?

An Automatic Voltage Regulator (AVR) in an excitation control system is used to maintain a consistent output voltage level from a generator. It automatically adjusts the excitation current supplied to the generator's rotor, ensuring stable voltage under varying load conditions. This helps in enhancing the reliability and stability of electrical power systems by preventing voltage fluctuations and improving overall system performance. Additionally, AVRs can contribute to reactive power management and system efficiency.