CONTROL APPROACH OF A GRID CONNECTED DFIG BASED WIND TURBINE USING MPPT AND PI CONTROLLER

Doubly fed induction generator (DFIG) has been frequently utilized in wind turbines due to its ability to handle variable speed operations. This study investigates the real parameters of a Mitsubishi company MWT 92/2.4 MW wind turbine model. It performs and implements grid-connected variable speed turbines, to control the active and reactive powers. Moreover, it presents a vector control strategy of DFIG for controlling the generated stator power. Meanwhile, the rotor side converter (RSC) and grid side converter (GSC) are developed separately. Proportional-Integral (PI) controller and maximum power point tracking (MPPT) algorithm are implemented to regulate the generated torque, active or reactive powers, grid voltage, stator and rotor currents. In addition, MPPT and PI controllers are compared in terms of settling time. Thus, the result demonstrates that the performance of the MPPT technique provides strong robustness and reaches steady-state much faster than the PI controller with variable parameters. To the contrary, typical PI controller gives fast response in tracking the references of DFIG magnitudes. The effectiveness of the overall system is tested by MATLAB simulation.

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