Performance of a Fuzzy Logic Based Automatic Voltage Regulator in Single and Multi-Machine Environment

In this paper the authors report on the design, simulation and validation of a fuzzy logic based automatic voltage regulator (AVR) to improve the stability of single-machine and multi-machine power systems. The authors have first tested the performances of both the fuzzy-based AVR and the conventional AVR for a single-machine -infinite-bus test system and have compared their performances. It has been observed that the stabilization of both terminal voltage and power angle are improved with the application of fuzzy-based AVR. Secondly, the performances of both fuzzy-based AVR and a conventional AVR are tested for stabilizing a disturbance due to a local fault occurring near one generator in a four-machine-two-area network. Here also, it is observed that the performance of the fuzzy-based AVR is superior to the conventional AVR in multi-machine environment.