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http://dx.doi.org/10.5370/JEET.2010.5.3.443

Enhanced Proportional-Resonant Current Controller for Unbalanced Stand-alone DFIG-based Wind Turbines  

Phan, Van-Tung (School of Electrical and Electronic Engineering, University of Ulsan)
Lee, Hong-Hee (School of Electrical Engineering, University of Ulsan)
Publication Information
Journal of Electrical Engineering and Technology / v.5, no.3, 2010 , pp. 443-450 More about this Journal
Abstract
An enhanced control strategy for variable-speed unbalanced stand-alone doubly-fed induction generator-based wind energy conversion systems is proposed in this paper. The control scheme is applied to the rotor-side converter to eliminate stator voltage imbalance. The proposed current controller is developed based on the proportional-resonant regulator, which is implemented in the stator stationary reference frame. The resonant controller is tuned at the stator synchronous frequency to achieve zero steady-state errors in rotor currents without decomposing the positive and negative sequence components. The computational complexity of the proposed control algorithm is greatly simplified, and control performance is significantly improved. Finally, simulations and experimental results are presented to verify the feasibility and the robustness of the proposed control scheme.
Keywords
Doubly fed induction generator (DFIG); Resonant controller; Unbalanced load; Stand-alone wind system;
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