Improved Strategy of an MPPT Based on the Torque Estimator for Variable Speed Turbines
This paper proposes a new adaptive control for Maximum Power Point Tracking (MPPT) in variable-speed wind turbine systems based on a doubly fed induction generator (DFIG). The proposed control does not neglect the dynamic of the drive train, when the conventional strategy considers that the aerodynamic torque is supposed to be equal to the mechanical torque. This assumption is not realistic, especially for turbulent winds. The closed loop control using a high-order sliding mode allows the generator to track the optimal operation points of the wind turbine system under fluctuating wind conditions. This improves the quality of energy, energy efficiency and presents attractive features. To meet at all times the LVRT requirements, a technique using a dynamic voltage restorer system (DVR) is developed to compensate the faulty line voltage, especially for grid disturbances, while the doubly fed induction generator (DFIG) can continue its nominal operation as demanded in actual grid codes. Simulation is carried out in SimPower toolbox of Matlab/Simulink. Simulation results confirm the effectiveness of the proposed control methods and shown that the controllers meet its objectives.
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