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Improved Control of DFIG Systems under Unbalanced Voltage Dip for Torque Stability Using PI-Fuzzy Controller

Hai Nguyen-Thanh 1,2
1. HCMC University of Technical and Education, Vietnam
2. Le Hong Phong High School for the Gifted, Ho Chi Minh City, Vietnam

Abstract—This paper introduces modified Stator Fed Oriented Control (SFOC) for Doubly Fed Induction Generator (DFIG) in wind turbines to reduce torque pulsation during unbalanced voltage; current waveforms are also improved with the decrease in harmonics. The proposed schemes apply multiple PI controllers with Fuzzy to obtain commanded rotor currents and also introduce extra commanded values for rotor current; Notch filters are also used to eliminate the second order harmonic components. The designed system consists of an induction generator with slip ring and back-to-back power electronic converters connected to both rotor and grid sides. The modifications are applied to the rotor side converter (RSC). Simulations in Matlab/Simulink illustrate the enhanced stability of torque response and improvement of current waveform. Comparisons of the simulation results with a traditional Stator Flux Oriented Control (SFOC) and a previously proposed modification for operation under unbalanced voltage are provided to evaluate the newly proposed methods in the paper.

Index Terms—DFIG, unbalanced voltage, PI controller, SFOC, fuzzy

Cite: Hai Nguyen-Thanh, "Improved Control of DFIG Systems under Unbalanced Voltage Dip for Torque Stability Using PI-Fuzzy Controller," International Journal of Electrical Energy, Vol. 2, No. 4, pp. 300-307, December 2014. doi: 10.12720/ijoee.2.4.300-307

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