Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based Wind Farm Integration System

Ke Ji; Hui Pang; Shan Liu; Guangfu Tang

doi:10.17775/CSEEJPES.2020.04900

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Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based Wind Farm Integration System

Regular Papers | 更新时间：2026-10-15

- Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based Wind Farm Integration System
- CSEE Journal of Power and Energy Systems Vol. 8, Issue 2, Pages: 634-639(2022)
- 作者机构：
  
  1. China Electric Power Research Institute,Beijing,China
  2. Global Energy Interconnection Research Institute,Beijing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2020.04900
  CLC：
- Published：01 March 2022
- 稿件说明：
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Ke Ji, Hui Pang, Shan Liu, et al. Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based Wind Farm Integration System[J]. CSEE Journal of Power and Energy Systems, 2022, 8(2): 634-639.
DOI：

Ke Ji, Hui Pang, Shan Liu, et al. Impedance Analysis Considering Unstable Subsystem Poles for MMC-HVDC-based Wind Farm Integration System[J]. CSEE Journal of Power and Energy Systems, 2022, 8(2): 634-639. DOI： 10.17775/CSEEJPES.2020.04900.

摘要

Abstract

Employing the AC/DC impedance analysis method

extensive research has been conducted on issues pertaining to harmonic resonance observed in wind farm-connected MMC-HVDC systems over the past 5 years. In general

this method divides the studied system into two subsystems at AC and DC sections. Subsequently

the impedance produced by these subsystems can be used to determine the system stability by implementing Nyquist criterion or generalized Nyquist stability criterion. However

the existing impedance analysis methods usually assume the subsystems to be stable and disregard certain special cases with potentially unstable subsystems

where the unstable poles of these subsystems must be evaluated before applying Nyquist criterion. In view of this consideration

a simplified method for identifying unstable subsystem poles is presented in this paper. Hence

the shortcoming of existing impedance analyses is rectified by considering the unstable subsystem poles. The proposed method and the stability analyses are validated by the electromagnetic transient simulation performed in PSCAD/EMTDC.

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