Abstract
In recent years, the problem of low-frequency oscillations of multi-machine power system has drawn much attention. The oscillations are primarily due to synchronous generator rotors swinging relative to each other. Supplementary excitation control systems, referred to as power system stabilizers, have been widely use in the electric power industry. This paper presents a hybrid power system stabilizer (HPSS) for the multi-machine power systems. The HPSS is comprised of a conventional power system stabilizer (CPSS) and a fuzzy power system stabilizer (FPSS). The CPSS is investigated to enhance the dynamic performance of the power system based on the conventional le algorithm. FPSS is designed to damp the unacceptable oscillations using the fuzzy logic technique. Finally, the efficiency of the proposed HPSS is demonstrated through simulations for a three-machine infinite- busbar power system.
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