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H∞ decentralized fuzzy model reference tracking control design for nonlinear interconnected systems

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2 Author(s)
Chung-Shi Tseng ; Dept. of Electr. Eng., Ming Hsin Inst. of Technol., Hsin Chu, Taiwan ; Chen, Bor-Sen

In general, due to the interactions among subsystems, it is difficult to design an H decentralized controller for nonlinear interconnected systems. The model reference tracking control problem of nonlinear interconnected systems is studied via H decentralized fuzzy control method. First, the nonlinear interconnected system is represented by an equivalent Takagi-Sugeno type fuzzy model. A state feedback decentralized fuzzy control scheme is developed to override the external disturbances such that the H∞ model reference tracking performance is achieved. Furthermore, the stability of the nonlinear interconnected systems is also guaranteed. If states are not all available, a decentralized fuzzy observer is proposed to estimate the states of each subsystem for decentralized control. Consequently, a fuzzy observer-based state feedback decentralized fuzzy controller is proposed to solve the H tracking control design problem for nonlinear interconnected systems. The problem of H decentralized fuzzy tracking control design for nonlinear interconnected systems is characterized in terms of solving an eigenvalue problem (EVP). The EVP can be solved very efficiently using convex optimization techniques. Finally, simulation examples are given to illustrate the tracking performance of the proposed methods

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Fuzzy Systems, IEEE Transactions on  (Volume:9 ,  Issue: 6 )