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Abstract

The hybrid differential evolution (HDE) has been used to investigate a novel decentralized pole placement design method of output feedback power system stabilizers. Since the local output variables are used as the feedback signals, the stabilizers could be easily implemented. In the design procedures, it wants to place the electromechanical modes within a designated region in the complex variable plane. The HDE method is originally an optimal searching approach. If all electromechanical modes have been moved to the specified region at the convergent steps, the objective function will reach zero, which is the minimum value. The objective function is chosen to ensure the real parts and damping ratios of electromechanical modes. A test power system is used to reveal the goodness of this method. The computation time and convergent characteristic of this approach are better, compared to the differential evolution and genetic algorithm. Since several operating conditions can be considered simultaneously in the determination of stabilizer parameters, the damping forces of the stabilizers could be ensured under a wider range of operating conditions. The coherency measures are also proposed to evaluate the relative behaviors between any pair of generators of the system with and without stabilizers.

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