DC-Voltage Fluctuation Elimination Through a DC-Capacitor Current Control for DFIG Converters Under Unbalanced Grid Voltage Conditions

被引：62
作者：
Liu, Changjin [1 ]
Xu, Dehong [2 ]
Zhu, Nan [2 ]
Blaabjerg, Frede [3 ]
Chen, Min [2 ]
机构：
[1] Gen Elect Global Res, Shanghai 201203, Peoples R China
[2] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
[3] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2013年 / 28卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Control analysis; dc-capacitor current; doubly fed induction generator (DFIG); resonant controller; unbalanced grid voltage; RESONANT CONTROLLER; PWM CONVERTER; DESIGN;
D O I：
10.1109/TPEL.2012.2223829
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Unbalanced grid voltage causes a large second-order harmonic current in the dc-link capacitors as well as dc-voltage fluctuation, which potentially will degrade the lifespan and reliability of the capacitors in voltage source converters. This paper proposes a novel dc-capacitor current control method for a grid-side converter (GSC) to eliminate the negative impact of unbalanced grid voltage on the dc-capacitors. In this method, a dc-capacitor current control loop, where a negative-sequence resonant controller is used to increase the loop gain, is added to the conventional GSC current control loop. The rejection capability to the unbalanced grid voltage and the stability of the proposed control system are discussed. The second-order harmonic current in the dc capacitor as well as dc-voltage fluctuation is very well eliminated. Hence, the dc capacitors will be more reliable under unbalanced grid voltage conditions. A modular implementation method of the proposed control strategy is developed for the DFIG controller. Finally, experiments are presented to validate the theoretical analysis.
引用
收藏
页码：3206 / 3218
页数：13
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