Design of Modified Repetitive Controller for T–S Fuzzy Systems

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  • Zhang Manli
    School of Automation, China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems
  • Wu Min
    School of Automation, China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems
  • Chen Luefeng
    School of Automation, China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems
  • Yu Pan
    Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Department of Electrical and Electronic Engineering, Chiba University

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<p>A repetitive controller contains a pure-delay positive-feedback loop that makes it difficult to stabilize a strictly proper system. A low-pass filter is inserted in a repetitive controller to relax the stability condition of the modified repetitive-control system at the cost of degrading the tracking performance. In this study, a modified repetitive-control approach is developed, which reaches a balance between the stability and tracking performance for a class of affine nonlinear systems based on the Takagi–Sugeno fuzzy model. First, a 2D model is established to adjust continuous control and discrete learning actions preferentially induced by exploiting the 2D property in a repetitive-control process. Then, the Lyapunov stability theory and 2D system theory are used to derive a sufficient stability condition in the form of linear matrix inequalities to design parallel-distributed-compensation-based state-feedback controllers. Finally, an application-oriented example is used, and a comparison is performed to show that an extra variable is introduced such that the developed method has a better tracking performance.</p>

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