Research on Single-pole Ground Fault Characteristics and Recovery Strategy of MCT

ZHENG Mei; CHEN Qian; SONG Yuanjian; XU Zheng; ZHANG Zheren

doi:10.13296/j.1001-1609.hva.2021.09.007

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Research on Single-pole Ground Fault Characteristics and Recovery Strategy of MCT

更新时间：2025-04-26

- Research on Single-pole Ground Fault Characteristics and Recovery Strategy of MCT
- High VoltageApparatus Vol. 57, Issue 9, Pages: 50-57(2021)
- 作者机构：
  
  1. 国网浙江省电力有限公司电力科学研究院
  2. 浙江大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.09.007
  CLC： TM407;TM721.1
- Published：2021
- 稿件说明：
移动端阅览
ZHENG Mei, CHEN Qian, SONG Yuanjian, et al. Research on Single-pole Ground Fault Characteristics and Recovery Strategy of MCT[J]. High voltageapparatus, 2021, 57(9): 50-57.
DOI：

ZHENG Mei, CHEN Qian, SONG Yuanjian, et al. Research on Single-pole Ground Fault Characteristics and Recovery Strategy of MCT[J]. High voltageapparatus, 2021, 57(9): 50-57. DOI： 10.13296/j.1001-1609.hva.2021.09.007.

摘要

直流变压器是解决直流输电系统互联时电压等级不一致问题的主要方法

然而直流变压器的故障特性和恢复策略尚不清楚。文中研究了模块化组合式直流变压器(modular combined DC transformer

MCT)在直流单极接地故障下的暂态特性

并分析了不同故障下交流侧隔直电容的放电过程

提出了相应的故障恢复策略。最后在PSCAD/EMTDC中搭建了含有MCT的柔性直流输电系统仿真模型

时域仿真结果验证了故障特性分析和故障恢复策略的正确性和有效性。

Abstract

The DC transformer is the main method to solve the problem of inconsistent voltage levels in the case of interconnection of the DC transmission system. However

the fault characteristics and recovery strategies of the DC transformer are still unclear. In this paper

the transient characteristics of modular combined DC transformer（MCT）under DC unipolar ground faults is studied. The discharge process of AC side blocking capacitors under different faults is analyzed and corresponding fault recovery strategies are proposed. Finally

a simulation model of a flexible HVDC system containing MCT is set up in PSCAD/EMTDC. The correctness and effectiveness of the fault characteristic analysis and fault recovery strategy are verified by the time-domain simulation results.

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