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Decentralized sliding mode control for multimachine power systems using only output information

In this paper, robust output feedback stabilization for multimachine power systems is considered. The power system is interconnected by a set of subsystems through a network transmission which is nonlinear and has an associated nonlinear bound. The uncertainty of the input matrix, and the mismatched uncertainty associated with the interconnections are both considered. Under some mild conditions, a decentralized sliding mode control scheme is developed. The conservatism of the obtained results is reduced by fully using the system output and the structures of uncertainties. Finally simulation results for a 3-machine power system are presented to show the effectiveness of the proposed method.