Amir Elahi - Dept. of Electrical Engineering Shahrekord University Shahrekord, Iran
Golam Reza Arab - Dept. of Electrical Engineering Shahrekord University Shahrekord, Iran
Jafar Soltani - Dept. of Electrical Engineering Isfahan University of technology Isfahan, Iran

This paper suggested an enhanced control strategy for Doubly Fed Induction Generator (DFIG) based on wind generation with Series Grid Side Converter (SGSC) under unbalanced and harmonic distorted grid voltage conditions. In order to balancing stator voltage and subsequently stator and rotor currents, a seriesvoltage is generated by SGSC and injected to the grid. Furthermore the fluctuations of stator active and reactive power and electromagnetic torque have been removed. A novel control method based on Sliding Mode Control (SMC) and without sequential decomposition of measured variables, is presented for control of SGSC. Also a new enhanced control method for dc link voltage is suggested using Parallel Grid Side Converter (PGSC). The controller is capable of removing oscillation in dc voltage link.Finally the proposed control method for DFIG system with SGSC has been validated by simulation results for a 2MW DFIG in both unbalanced and harmonic distorted grid voltage conditions

DFIG; Sliding Mode Control; Unbalanced Grid Voltage; Sequential Decomposition