This paper proposes an adaptive gain second-order sliding mode control strategy to track optimal electromagnetic torque and\nregulate reactive power of doubly fed wind turbine system. Firstly, wind turbine aerodynamic characteristics and doubly fed\ninduction generator (DFIG) modeling are presented. Then, electromagnetic torque error and reactive power error are chosen\nas sliding variables, and fixed gain super-twisting sliding mode control scheme is designed. Considering that uncertainty upper\nbound is unknown and is hard to be estimated in actual doubly fed wind turbine system, a gain scheduled law is proposed to\ncompel control parameters variation according to uncertainty upper bound real-time. Adaptive gain second-order sliding mode\nrotor voltage controlmethod is constructed in detail and finite time stability of doubly fed wind turbine control system is strictly\nproved.The superiority and robustness of the proposed control scheme are finally evaluated on a 1.5MWDFIGwind turbine system.
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