Grid side harmonic current mitigation in DFIG based wind plants

In this paper a new double tuned PI-R based current controller has been used for effectively mitigating the most significant and troublesome harmonic current of grid side in DFIG system. One part is tuned at 6ω_s and the other is tuned at 12ω_s which are responsible for mitigating 5^th, 7^th and 11^th, 13^th order harmonic components respectively. Mitigation method is applied to the rotor side converter whereby controls the fundamental and harmonic current components simultaneously, so that fundamentals are used for decoupled active and reactive power control and harmonics for enhancing power quality. The controller performance is investigated by simulation in Simulink-SimPower environment and compared to the conventional Hysteresis controller. The results confirm the controller prominent features, tracking ac contained references and mitigation capabilities.