Enhanced Sliding Mode MPPT and Power Control for Wind Turbine Systems Driven DFIG (Doubly-Fed Induction Generator)

摘要

The control strategy that uses maximum power point tracking (MPPT) technique of the wind turbine essentially relies on the power of the wind, the turbine power curve and the ability of the generator to adjust itself to any conditions related to the wind fluctuations. This article proposes a new robust and efficient nonlinear speed control strategy of the turbine-doubly fed induction generator system in order to improve the control and the energy performances of this system. Achieving these goals, a nonlinear Sliding Mode Control (SMC) is implemented, which includes two control blocks: the first one uses the MPPT strategy to adapt the turbine speed with the generator speed value by keeping the power coefficient at maximum value via the second sliding mode control. The second block ensures regulation of the generator's active and reactive powers by using the integral sliding mode control. The simulations realized in Matlab/Simulink demonstrate the elimination of the chattering phenomenon, a good pursuit of the references and good stability.