Research on Topology of Improved Multi-terminal MVDC Circuit Breaker Based on Coupled Negative Voltage

LIU Shuhan; ZHUANG Yuan; LI Chenjie; WANG Yifeng; WANG Ruolan; LI Jiangtao

doi:10.13296/j.1001-1609.hva.2026.01.005

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Research on Topology of Improved Multi-terminal MVDC Circuit Breaker Based on Coupled Negative Voltage

Research & Analysis | 更新时间：2026-04-13

- Research on Topology of Improved Multi-terminal MVDC Circuit Breaker Based on Coupled Negative Voltage
- High Voltage Apparatus Vol. 62, Issue 1, Pages: 32-41(2026)
- 作者机构：
  
  国网江苏省电力有限公司徐州供电分公司，江苏徐州　221005
  江苏徐电建设集团有限公司，江苏徐州　221005
  西安交通大学电气工程学院，西安　710049
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.01.005
  CLC：
- Received：11 July 2025，
  
  Revised：2025-09-21，
  
  Published：16 January 2026
- 稿件说明：
移动端阅览
LIU Shuhan, ZHUANG Yuan, LI Chenjie, et al. Research on Topology of Improved Multi-terminal MVDC Circuit Breaker Based on Coupled Negative Voltage[J]. High Voltage Apparatus, 2026, 62(1): 32-41.
DOI：

LIU Shuhan, ZHUANG Yuan, LI Chenjie, et al. Research on Topology of Improved Multi-terminal MVDC Circuit Breaker Based on Coupled Negative Voltage[J]. High Voltage Apparatus, 2026, 62(1): 32-41. DOI： 10.13296/j.1001-1609.hva.2026.01.005.

摘要

柔性直流配电网的可靠性建立在成熟的中压直流断路器基础之上，然而直流断路器高昂的造价限制了其在配电网中的应用。为了降低直流断路器在配电网中的投资成本，结合耦合负压换流方式，设计了一种改进型多端口混合式直流断路器。首先，对现有直流断路器的拓扑结构进行了分析；然后，提出了改进型多端口混合式直流断路器的拓扑结构，对分断故障时的动作时序进行了设计；最后，基于Pscad/Emtdc搭建了四端环网型柔性直流配电网，仿真分析了改进型多端口混合式直流断路器切除双极短路故障时的暂态特性，得到了内部电压、电流的分布情况，验证了所设计的故障隔离时序的可行性。结果表明，改进型多端口混合式直流断路器可在3 ms内开断故障电流，控制难度较低，与其他几种形式的拓扑相比具有更好的经济性。

Abstract

The reliability of VSC DC distribution network is set up on the basis of mature MV circuit breaker and

however

the high cost of DC circuit breaker limits its application in the distribution network. In order to reduce the investment cost of DC circuit breaker in VSC distribution network

a kind of improved multi-terminal hybrid DC circuit breaker is designed based on coupled negative voltage commutation method. First

the topological structure of the existing DC circuit breaker is analyzed. Then

the topological structure of improved multi-port hybrid DC circuit breaker is proposed

and the operation sequence in interrupting the fault is designed. Finally

a four-terminal ringmain VSC DC distribution network is set up on the basis of Pscad/Emtdc

and the transient characteristics of the improved multi-terminal hybrid DC circuit breaker during bipolar short circuit fault interruption are analyzed. The distribution of internal voltage and current is obtained and the feasibility of the designed fault isolation sequence is verified. The results show that the improved multi-terminal hybrid DC circuit breaker can interrupt fault current within 3 ms

has low control difficulty and has more economical performance than other types of topology.

关键词

Keywords

references

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