Impedance Modeling and Key Stabilizing Factor Evaluation of DFIG-based Wind Turbines With Negative Sequence Control During Weak Power Grid

被引：0
|
作者：
Wu H. [1 ]
Xu H. [1 ]
Zhang L. [2 ]
Li Z. [1 ]
Wang Y. [1 ]
机构：
[1] College of New Energy, China University of Petroleum (East China), Qingdao
[2] Electric Power Branch, Sinopec Shengli Petroleum Administration Co., Ltd., Dongying
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 06期
基金：
中国国家自然科学基金;
关键词：
asymmetric fault; doubly-fed induction generator (DFIG); impedance modeling; negative sequence control; small signal stability; weak grid;
D O I：
10.13336/j.1003-6520.hve.20220622
中图分类号：
学科分类号：
摘要：
During asymmetric faults of weak grid, the coupling of positive and negative-sequence between the doubly-fed induction generator (DFIG) and the grid will facilitate their complex interaction and system instability. To investigate the instability mechanism of the DFIG under the asymmetric faults, the expressions of voltages and currents are derived with the injection of positive and negative-sequence harmonic voltages. And the sequence impedance model of the DFIG with negative-sequence control is then established. Based on the sequence impedance model, the influence of the control loops on the DFIG impedance is discussed. Further, based on the generalized Nyquist stability criterion, the effects of the controller bandwidths, the grid strength and the grid fault depth on the stability of the DFIG system are analyzed, respectively. The results show that the established sequence impedance model can be used to effectively analyze the stability of the DFIG system during the asymmetric weak grid. In addition, with the decrease of the controller bandwidth, the DFIG system will get stable. Finally, the simulations and experiments validate the correctness of the theoretical analysis. The conclusions can provide theoretical supports for the control design of the DFIG during asymmetric faults. © 2023 Science Press. All rights reserved.
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页码：2516 / 2528
页数：12
相关论文
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