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Power system load-frequency controller design based on discrete variable structure control theory

This paper proposes a discrete-time variable structure reaching law with attenuating quasi-sliding mode band, and gives the variable condition of quasi-sliding mode band. The proposed reaching law is applied to design a load-frequency controller for a power system. The simulation results show that the controller can not only eliminate system chattering, but also improve dynamic performance of the system effectively and make the system possess a strong robustness property.