Influence of Static Var Generator on High Frequency Oscillation of Doubly-Fed Wind Farm

doi:10.11930/j.issn.1004-9649.202203109

Abstract

Abstract: The connection of static var generator (SVG) in doubly-fed wind farms can easily cause high frequency oscillation in the system, which seriously threatens the safe and stable operation of wind farms. Therefore, this paper firstly builds a high frequency impedance model including doubly-fed wind turbines, collector lines, and SVG. In addition, in PSCAD/EMTDC, a doubly-fed simulation model considering four wind turbine links, collector lines, and SVG is built. The accuracy of the built high-frequency impedance model of the doubly-fed wind farm is verified by comparing the impedance scan with the theoretical impedance. Furthermore, the high-frequency oscillation of the doubly-fed wind farm is analyzed and the influence of SVG system parameters on the oscillation of the wind farm is explored. The research results show that the SVG delay, inner loop control parameters, and filter inductance are key factors affecting the high-frequency oscillation of SVG. Finally, the correctness of the above theoretical analysis is verified by simulation.

Key words: SVG, DFIG, time delay, high frequency oscillation, impedance analysis method

WU Linlin, CHENG Hao, LIU Jingbo, DU Dongye, GONG Chao, GUO Chunyi. Influence of Static Var Generator on High Frequency Oscillation of Doubly-Fed Wind Farm[J]. Electric Power, 2022, 55(9): 163-173,182.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202203109

https://www.electricpower.com.cn/EN/Y2022/V55/I9/163

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