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Active and Reactive Power Regulation of a Grid Connected Wind Energy Conversion System with Doubly Fed Induction Generator

Aishwarya Devi R

This paper presents the regualtion of the active and reactive powers in a grid connected Doubly Fed Induction Generator(DFIG) based Wind Energy conversion System (WECS). A back to back PWM converter setup with stator flux oriented vector control is used to control the DFIG. The constituents of the WECS are mathematically modelled in MATLAB/SIMULINK . The back to back PWM converter set up consists of the Rotor Side Converter (RSC) and the Grid Side Converter (GSC) with intermediate DC link .Decoupled control of the DC link voltage and the grid reactive power is obtained through Voltage oriented control (VOC) of GSC. Similarly independant control of power from wind and reactive power of DFIG is carried out by stator flux oriented vector control of RSC. Coordinated control of the back to back converter setup in both subsynchronous and supersynchronous mode is presented. Maximum power is captured at all wind speeds by controlling DFIG torque and overall power factor of the system is maintained to be unity.