Improved Capacitive Sub-module with DC Fault Self-clearing Capability

LUO Yongyi; WANG Yuhong; SONG Ruihua; BI Jingtian; YE Wei; MIN Yangxi

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Improved Capacitive Sub-module with DC Fault Self-clearing Capability

更新时间：2025-12-08

- Improved Capacitive Sub-module with DC Fault Self-clearing Capability
- Vol. 47, Issue 12, Pages: 4510-4517(2021)
- 作者机构：
  
  1. 四川大学电气工程学院
  2. 中国电力科学研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 December 2021，
  
  Published：2021
- 稿件说明：
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LUO Yongyi, WANG Yuhong, SONG Ruihua, et al. Improved Capacitive Sub-module with DC Fault Self-clearing Capability[J]. 2021, 47(12): 4510-4517.
DOI：

LUO Yongyi, WANG Yuhong, SONG Ruihua, et al. Improved Capacitive Sub-module with DC Fault Self-clearing Capability[J]. 2021, 47(12): 4510-4517. DOI：

摘要

模块化多电平换流器(modular multilevel converter

MMC)在柔性直流输电领域应用广泛

但传统的半桥型子模块(half-bridge sub-module

HBSM)不具备直流侧故障自清除的能力。为此

提出一种具备直流侧故障自清除能力的改进电容型子模块拓扑结构

分析了新型子模块的基本结构及工作原理;根据子模块闭锁后的系统等效电路

阐述了新型子模块的故障阻断机理;为兼具故障自清除与低损耗的特点

给出了新型子模块与HBSM混合的MMC桥臂设计方案;并从器件耐压水平及经济性两个方面

与常见的子模块做详细比较分析;最后在PSCAD/EMTDC中搭建了双端MMC系统对提出的子模块特性进行了仿真验证。仿真结果表明

直流侧故障后的故障电流在子模块闭锁后能迅速清零

验证了所提子模块直流侧故障自清除的有效性。

Abstract

Modular multilevel converter（MMC） is widely used in the field of flexible DC transmission

but the traditional half bridge sub-module（HBSM） does not have the ability of DC side fault self-clearing. In this paper

an improved capacitive sub-module topology with DC side fault self-clearing capability is proposed

and the basic structure and working principle of the new sub-module are analyzed. According to the system equivalent circuit after the sub-module is locked

the fault blocking mechanism of the new sub-module is described. In order to possess the characteristics of fault self-clearing and low loss

the design scheme of MMC bridge arm with the new sub-module and HBSM is given. From the two aspects of device voltage withstand and economy

a detailed comparison and analysis are carried out with the common sub-modules. Finally

a two-terminal MMC system is built in PSCAD/EMTDC to simulate and verify the characteristics of the proposed sub-module. The simulation results show that the fault current after DC side fault can be quickly cleared after the sub-module is locked

which verifies the effectiveness of the proposed sub-module DC side fault self-clearing.

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