混合型MMC拓扑及应用于MTDC直流故障穿越能力分析

MENG Xinhan

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混合型MMC拓扑及应用于MTDC直流故障穿越能力分析

更新时间：2025-08-13

- 混合型MMC拓扑及应用于MTDC直流故障穿越能力分析
- Automation of Electric Power Systems Vol. 39, Issue 24, Pages: 72-79(2015)
- 作者机构：
  
  山东大学电气工程学院,山东省,济南市,250061
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2015
- 稿件说明：
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MENG Xinhan. [J]. Automation of electric power systems, 2015, 39(24): 72-79.
DOI：

MENG Xinhan. [J]. Automation of electric power systems, 2015, 39(24): 72-79. DOI：

摘要

模块化多电平换流器(MMC)已成为高压直流输电领域最具前景的换流器技术之一。然而

与低电平电压源型换流器(VSC)相同

目前研究较多的半桥型MMC缺乏闭锁直流故障的能力。文中分析了不同结构的MMC在发生直流故障时短路电流的情况

提出了一种改进的MMC拓扑结构

基于错位层叠理论和换流器闭锁直流故障的原理

设计了一种适用于多端柔性直流(VSC-MTDC) 输电系统的混合型MMC拓扑结构

并结合VSC-MTDC系统直流故障时的“握手原则”详细说明了实现故障线路切除、非故障线路恢复的过程。最后

以典型的四端直流输电系统为例

通过PSCAD／EMTDC建模仿真

对故障后果最为严重的直流侧双极短路故障下的系统特性进行了分析验证。结果表明

基于该拓扑结构的多端直流系统能够在直流侧发生故障时快速闭锁换流器

并在短时间内恢复非故障线路的正常运行。

Abstract

The modular multilevel converter (MMC) has become one of the most promising converter technologies in the high voltage direct current transmission system. However

like the low level voltage source converter (VSC)

the half bridge MMC

a topical subject at present

is unable to block the direct current (DC) fault. In light of the short-circuit situations of different MMC structures under the DC fault

an improved MMC topology is proposed. A hybrid MMC topology based on mismatched-cascade mechanism and the DC fault blocking principle of converter is designed

which is very suitable for the VSC based multi-terminal DC (VSC-MTDC) transmission system. The process of switching off the faulty line and recovering the normal line is explained with the “handshaking method” when a DC fault happens in the VSC-MTDC transmission system. Finally

a typical four-terminal DC system is introduced and simulations are performed in PSCAD/EMTDC to verify the system characteristics under a bipolar short-circuit fault which is the most serious DC fault. The results show that the multi-terminal DC system based on the topology proposed is able to quickly block the converter under a DC fault and recover the normal line within a short time.This work is supported by State Grid Corporation of China.

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