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Optimal allocation and design of PSSs for damping of low-frequency oscillations in an interconnected power system

Large extended power systems are often characterized by inter-area oscillations, usually spontaneous, which may be caused by small disturbances such as changes in load that take place continually. Inter-area oscillations have been the subject for studies in fields of operation, control, and devices by many power system utilities in Japan. To analyze and solve the problem of long-term poor-damping oscillation phenomena, a method is presented to find the best allocation and to design PSS for damping long-term poor-damping oscillation. The design method for multi-input PSSs is based on the single-machine-infinite-bus models. The designed PSSs have been verified in a Japanese power system standard model.