Analysis and Suppression of Oscillation of Weak Grid-tied VSC Using RLC Circuit Model

Ruiqing Fu; Longyuan Li; Xiaoru Wang; Xiaoqin Lyu

doi:10.17775/CSEEJPES.2022.02420

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Analysis and Suppression of Oscillation of Weak Grid-tied VSC Using RLC Circuit Model

Regular Papers | 更新时间：2026-10-10

- Analysis and Suppression of Oscillation of Weak Grid-tied VSC Using RLC Circuit Model
- CSEE Journal of Power and Energy Systems Vol. 12, Issue 5, Pages: 2502-2516(2026)
- 作者机构：
  
  School of Electrical Engineering, Southwest Jiaotong University,Chengdu,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.02420
  CLC：
- Published：01 September 2026
- 稿件说明：
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Ruiqing Fu, Longyuan Li, Xiaoru Wang, et al. Analysis and Suppression of Oscillation of Weak Grid-tied VSC Using RLC Circuit Model[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2502-2516.
DOI：

Ruiqing Fu, Longyuan Li, Xiaoru Wang, et al. Analysis and Suppression of Oscillation of Weak Grid-tied VSC Using RLC Circuit Model[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2502-2516. DOI： 10.17775/CSEEJPES.2022.02420.

摘要

Abstract

Weak grid is known to induce low frequency range oscillation of grid tied voltage source converter (VSC). Most previous studies have focused on negative resistance effect of VSC introduced by phase-locked-loop (PLL). In this paper

capacitance effect of weak grid tied VSC is analyzed and mechanism weak grid affects capacitance exhibited by VSC through frequency coupling and further leads to low frequency range oscillation of VSC is reveled. Impact of frequency coupling on low frequency range oscillation is quantified with Relative Gain Array and Gershgorin band. RLC circuit model considering frequency coupling is given based on the sequence impedance model of VSC. Effects of frequency coupling in weak grid on capacitance of RLC circuit model is analytically and theoretically analyzed. Furthermore

with the diagonal matrix method

an oscillation suppression method is proposed to reduce capacitance effect of VSC by weakening frequency coupling. All theoretical results are validated by simulations with PSCAD/EMTDC.

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