A Fuzzy Logic Based Discrete Mode Power System Stabilizer

Abstract

A Fuzzy Power System Stabiliser (FPSS) design using discrete inputs is presented. The FPSS basically utilises only one measurable plant signal as input, namely, the generator speed. The speed signal is discretised resulting in three inputs to the FPSS. A simplified power system represented by a single generator transmitting power to the infinite bus is considered for investigations. The system is simulated in simulink while the FPSS is implemented using Fuzzy Logic Toolbox. There are six rules for the fuzzification and two rules for defuzzification. To provide satisfactory behaviour in the entire region of operation of the generator, additional signals namely, generator's active and reactive power are used as inputs to FPSS. Simulation studies show the superior performance of the proposed FPSS compared to an optimally designed Conventional Power System Stabiliser.