A New Robust Adaptive Fuzzy Sliding Mode Controller for a Variable Speed Wind Turbine
In this paper, we present a novel adaptive fuzzy sliding mode controller without reaching phase and chattering problems for a variable speed wind turbine with unknown dynamic parts. The approach is based on modifying the sliding domain equation through the use of logarithmic functions. The adaptive fuzzy law Takagi-Sugeno (TS) model is used to approximate the unknown dynamic parts. In this model, only the rotor speed is available, an asymptotic fuzzy observer is used to approximate the unknown rotor acceleration which is needed to synthesize the control law. The stability and effectiveness of the proposed control law are proved and the simulation is given to demonstrate the superiority of the proposed approach in comparison with the previous one, in terms of settling time, tracking accuracy, energy consumption and smoothness of the control input.
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