DC Fault Current Calculation Method and Transient Characteristics of True Bipolar MMC-HVDC Systems

Botong Li; Yichao Liu; Bin Li; Wenxin Wang; Weijie Wen; Xiaolong Chen

doi:10.17775/CSEEJPES.2021.00440

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DC Fault Current Calculation Method and Transient Characteristics of True Bipolar MMC-HVDC Systems

Regular Papers | 更新时间：2026-10-15

- DC Fault Current Calculation Method and Transient Characteristics of True Bipolar MMC-HVDC Systems
- CSEE Journal of Power and Energy Systems Vol. 11, Issue 4, Pages: 1704-1716(2025)
- 作者机构：
  
  1. Key Laboratory of Smart Grid of Ministry of Education, Tianjin University,Tianjin,China
  2. Key Laboratory of Smart Grid of Ministry of Education, State Grid Tianjin Electric Power Company, Tianjin University,Tianjin,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2021.00440
  CLC：
- Published：01 July 2025
- 稿件说明：
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Botong Li, Yichao Liu, Bin Li, et al. DC Fault Current Calculation Method and Transient Characteristics of True Bipolar MMC-HVDC Systems[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1704-1716.
DOI：

Botong Li, Yichao Liu, Bin Li, et al. DC Fault Current Calculation Method and Transient Characteristics of True Bipolar MMC-HVDC Systems[J]. CSEE Journal of Power and Energy Systems, 2025, 11(4): 1704-1716. DOI： 10.17775/CSEEJPES.2021.00440.

摘要

Abstract

In this paper

the calculation method and transient characteristics of asymmetric faults in the DC side of a true bipolar system are studied. First

two typical MMC fault equivalent methods are analyzed

and comparison shows that active RLC equivalent branches are more suitable for fault analyses of a true bipolar system. Second

considering the influence of mutual impedance between the poles in DC side

a DC fault current calculation method for a true bipolar systems is proposed. Finally

the characteristics of transient electrical quantities including fault current and DC voltage in the process of DC faults in true bipolar systems are analyzed and summarized to provide references for the design of DC line insulation and relay protection schemes.

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