Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System

Ningning Liu; Yongli Li; Xiaolong Chen; Jiashuo Liu; Yuchen Zhu

doi:10.17775/CSEEJPES.2023.02620

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Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System

Regular Papers | 更新时间：2026-04-16

- Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System
- Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System
- 中国电机工程学会电力与能源系统学报(英文) 2026年12卷第2期页码：851-863
- 作者机构：
  
  1. China Electric Power Research Institute,Beijing,China
  2. School of Electrical Automation and Information Engineering, Tianjin University,Tianjin,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2023.02620
  中图分类号：
- 纸质出版：2026
- 稿件说明：
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Ningning Liu, Yongli Li, Xiaolong Chen, 等. Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(2):851-863.

Ningning Liu, Yongli Li, Xiaolong Chen, et al. Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System[J]. CSEE Journal of Power and Energy Systems, 2026, 12(2): 851-863.
Ningning Liu, Yongli Li, Xiaolong Chen, 等. Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(2):851-863. DOI： 10.17775/CSEEJPES.2023.02620.

Ningning Liu, Yongli Li, Xiaolong Chen, et al. Fault Voltage Amplitude Coefficient-based Protection for DC Lines in Hybrid Multi-terminal DC System[J]. CSEE Journal of Power and Energy Systems, 2026, 12(2): 851-863. DOI： 10.17775/CSEEJPES.2023.02620.

摘要

Abstract

The article deduces analytic expression of voltage travelling wave for hybrid cascaded DC system and puts forward protection based on amplitude coefficients of line-mode fault-component voltage (LFCV). By analyzing time-domain expressions of fault voltage travelling waves

it is derived that under internal faults

for the head of line

the ratio of two amplitude coefficients of the LFCV is 1:2

while for the end of line

the ratio of two amplitude coefficients of the LFCV is 1:0. Then

it is further derived that under internal faults

for either side of line

the sum of two amplitude coefficients of the LFCV is far less than 0. However

under external faults

for the near faulty terminal of the line

the ratio of two amplitude coefficients of the LFCV is 1:–1; thus

the sum of two amplitude coefficients is 0. Therefore

the amplitude coefficients of LFCV can be utilized to distinguish the internal fault from the external fault. Simulation verifies that the method can reliably discriminate the internal and external faults even with high fault resistances and has high robust

ss confronting noise interference.

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