Principle role of a Power System Stabilizer (PSS) is to increase damping of oscillations of generator rotor by control of its excitation by using of auxiliary stabilizer signals. The design of a PSS can be performed by suitable state and optimum feedback that roots of case study is transferred to suitable points as designed results. As the large searching techniques, Genetic Algorithms (GA) is global search techniques to provide a powerful tool for optimization problems by optimizing the mechanisms of natural selection and genetics. To fast accessing of desired results, this paper used a modified Genetic Algorithm for suitable designing of stabilizer. Finally, the advantages of the proposed method are illustrated by numerical simulation of the one machines-infinite-bus power systems.

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