Impedance-Based Analysis of the Dynamic Stability for the Weak Grid-Connected DFIG during LVRT

被引：0
|
作者：
Liu, Ruikuo [1 ]
Yao, Jun [1 ]
Wang, Xuewei [1 ]
Sun, Peng [1 ]
Pei, Jinxin [1 ]
机构：
[1] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Chongqing, Peoples R China
来源：
2018 IEEE INTERNATIONAL POWER ELECTRONICS AND APPLICATION CONFERENCE AND EXPOSITION (PEAC) | 2018年
基金：
中国国家自然科学基金;
关键词：
dynamic stability; doubly fed induction generator (DFIG); weak grid; impedance-based method; low voltage ride through (LVRT); phase-locked loop (PLL);
D O I：
暂无
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：
This paper establishes a small-signal impedance model of the doubly fed induction generator (DFIG) system under weak grid faults taking the dynamic of controller and impedance controller into account. Based on the impedance model, the instability mechanism of the DFIG system during LVRT is analyzed using the generalized Nyquist criterion (GNC). The analysis result shows that the small-signal instability of the DFIG system is due to the DFIG-based wind turbines (WTs) in account of the control showing the negative damping characteristics during grid fault. The small-signal stability of the DFIG system can be improved by changing the bandwidth of the phase-locked loop (PLL). The Simulation results verify the correctness of the analysis.
引用
收藏
页码：969 / 974
页数：6
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