VECTOR CONTROL OF A DFIG BASED WIND TURBINE

Özet

Variable speed wind turbines (WT) based on the Doubly-Fed Induction Generator (DFIG) iscommercially offered and is frequently used in grid connected mode. The variable speed operation insuch wind turbines is achieved by means of a four-quadrant ac-dc-ac power converter among therotor winding and the grid while the stator is directly connected to the grid. Below rated wind speed,tracking the maximum power/torque curve realized by speed/current control mode while pitchcontrol ensures the rated power for above rated wind speed. In this research, a maximum powercontrol strategy is incorporated with the DFIG whereby the produced power serves as the dynamicactive power reference for the DFIG. Stator flux oriented vector control is applied to decouple thecontrol of active and reactive power generated by the DFIG based WT. Details of the control strategyand system simulation results in Simulink are presented in the paper to show the effectiveness of theproposed control strategy.