Improved Control Strategy for DFIG Wind Turbines for Low Voltage Ride Through

Energies

Zaijun Wu¹  Chanxia Zhu² 

[1]School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, Jiangsu, China

关键词: doubly fed induction generator (DFIG);    low voltage ride through (LVRT);    grid defaults;   

DOI  :  10.3390/en6031181

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.