DFIG-BASED WIND TURBINE GENERATOR PERFORMANCE ANALYSIS FOR WIND SPEED VARIATION

Abstract

Wind unit in power system over the last decades has received global attention as compared to other renewable sources because of its emission free nature. This paper performs an evaluation of Doubly-Fed Induction Generators (DFIG)-based wind turbine under different wind speeds variation in synchronous rotating reference frame. Many authors have presented similar models but this paper develops a Simulink model for the DFIG by using the analytical equations of the DFIG instead of the single DFIG block contained in the Simscape library of the Simulink software. The control strategy was also implemented using appropriate function blocks in the Simulink environment and some MATLAB scripts. Maximum Power Point Tracking (MPPT) technique was applied to wind turbine and it extracts optimal power from the wind. Proportional Integral (PI) controller has been used to stabilize the system against wind speed fluctuations. The rotor speed response after connecting it to the wind speed changed from 8 m/s to 10 m/s was provided. The voltage of the DC link was controlled to a constant value of 1150 V for a constant rotor power, while the reactive power of the rotor was regulated at 0 VAR thereby ensuring that no reactive power was exchanged with the grid. Simulation results has shown that the effectiveness of DFIG-based wind turbine to operate at different wind speed conditions to capture more power from the wind.