Comparison study between PID and Fuzzy Logic Controller to improve performance of AVR system for synchronous generators

Voltage regulator is very essential in controlling a constant output voltage due to changes in input voltage or load conditions, It is also important in controlling the voltage in photovoltaic systems and contributes to improving their performance and protection. The conventional technologies to control the Automatic Voltage Regulator (AVR) shows exhibit robustness and time-consuming when it is tuned. In this paper, the comparison study of a fuzzy logic and a PID controller for AVR is presented the purpose of this work is to provide a better understanding of the characteristics of AVR as a power system stabilizer (PSS) and to build an AVR controller utilizing PID and fuzzy logic. Based on a single machine, infinite bus system, the simulation was created fuzzy logic controller (FLC )is formed from three sets of rules which are based on fuzzification, rule evaluation and defuzzification. The performances for both PID and Fuzzy logic controller are compared in term of AVR terminal voltage output stability. It is suggested that FLC offer better performance compared to PID.