Optimal Design of Controller for AVR Performance Enhancement

Abstract

Power system stability and power quality are improved by excitation control of synchronous generator. Automatic Voltage Regulator (AVR) system is an important device to regulate synchronous generator terminal voltageby control of excitation.A controller is recommended to improve stability and get fast response so Proportional-Integral-Derivative (PID) and Proportional-Integral-Derivative-Acceleration (PIDA) controllers are used.Harmony Search Algorithm (HSA), Local Unimodal Sampling (LUS), Teaching Learned Based Optimization (TLBO) and Whale Optimization Algorithm (WOA) are the optimization techniques used to tune each controller parameters.Integrated Square Error (ISE) is used as an objective function to minimize error voltage for better stability and response. Transient response, Root locus and Bode diagram are calculated for each controller using the four optimization techniques. The results are compared with other optimization techniques to find out the best response and stability for an AVR system. The results show also which controller is better. Robustness analysis is made on the best system to check terminal voltage response with respect to load variation to ensure that this