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Improved Control Strategy for DFIG Wind Turbines for Low Voltage Ride Through
School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, Jiangsu, China
* Author to whom correspondence should be addressed.
Received: 20 November 2012; in revised form: 20 February 2013 / Accepted: 20 February 2013 / Published: 25 February 2013
Abstract: This paper presents an improved control strategy for both the rotor side converter (RSC) and grid side converter (GSC) of a doubly fed induction generator (DFIG)-based wind turbine (WT) system to enhance the low voltage ride through (LVRT) capability. Within the proposed control strategy, the RSC control introduces transient feed-forward compensation terms to mitigate the high frequency harmonic components and reduce the surge in the rotor currents. The proposed GSC control scheme also introduces a compensation term reflecting the instantaneous variation of the output power of the rotor side converter with consideration of the instantaneous power of grid filter impendence to keep the dc-link voltage nearly constant during the grid faults. To provide precise control, non-ideal proportional resonant (PR) controllers for both the RSC and GSC current regulation are employed to further improve dynamic performance. Simulations performed in Matlab/Simulink verify the effectiveness of the proposed control strategy.
Keywords: doubly fed induction generator (DFIG); low voltage ride through (LVRT); grid defaults
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Cite This Article
MDPI and ACS Style
Wu, Z.; Zhu, C.; Hu, M. Improved Control Strategy for DFIG Wind Turbines for Low Voltage Ride Through. Energies 2013, 6, 1181-1197.
Wu Z, Zhu C, Hu M. Improved Control Strategy for DFIG Wind Turbines for Low Voltage Ride Through. Energies. 2013; 6(3):1181-1197.
Wu, Zaijun; Zhu, Chanxia; Hu, Minqiang. 2013. "Improved Control Strategy for DFIG Wind Turbines for Low Voltage Ride Through." Energies 6, no. 3: 1181-1197.