Modeling and Mechanism Analysis of Sub/Super-synchronous Oscillation of Grid-connected DFIG Wind Farms (Part II): Analysis of Impedance Characteristic and Oscillation Mechanism

被引：0
|
作者：
Li G. [1 ]
Wang W. [2 ]
Zhang X. [1 ]
He G. [2 ]
Liu C. [2 ]
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei
[2] State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute), Haidian District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2022年 / 42卷 / 10期
关键词：
Doubly-fed induction generators (DFIGs) wind farm; Impedance modeling; Series compensation; Sub-synchronous resonance; Super-synchronous resonance; Weak grid;
D O I：
10.13334/j.0258-8013.pcsee.210049
中图分类号：
学科分类号：
摘要：
The sub/super-synchronous oscillation occurs frequently in large-scale doubly-fed induction generators (DFIGs) wind farm grid-connected systems, the oscillation mechanism in different frequency bands needs to be studied urgently. Based on the impedance model of typical topology and control structure of DFIG wind turbines considering outer power loop, the dominant factors of DFIG impedance in each frequency band were studied by simplifying the model. The impedance characteristics of DFIG in sub-and super-synchronous frequency band were analyzed, explaining the generation of the negative damping characteristic in each frequency band, and quantitatively describing the upper and lower limits of the negative damping distribution frequency. Combined with the maximum peak Nyquist stability criterion, the sub-synchronous oscillation mechanism of DFIGs connected to series-compensated grid and the super- synchronous oscillation mechanism of DFIGs connected to AC weak grid were revealed. Finally, based on the control hardware-in-the-loop (CHIL) simulation platform, the impedance scanning and oscillation reappearance of several practical DFIGs were carried out to verify the sub-and super-synchronous oscillation mechanism in each frequency band proposed in this paper. © 2022 Chin. Soc. for Elec. Eng.
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页码：3614 / 3626
页数：12
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