Switching Overvoltage Analysis for Modular Multilevel Converters

LI Hongzhi; HE Zhiyuan; YANG Jie; LI Qiang; XU Weihua; ZHANG Juanjuan

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Switching Overvoltage Analysis for Modular Multilevel Converters

更新时间：2025-12-08

- Switching Overvoltage Analysis for Modular Multilevel Converters
- Vol. 43, Issue 4, Pages: 1144-1151(2017)
- 作者机构：
  
  1. 全球能源互联网研究院
  2. 先进输电技术国家重点实验室 3. 大功率电力电子北京市重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 April 2017，
  
  Published：2017
- 稿件说明：
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LI Hongzhi, HE Zhiyuan, YANG Jie, et al. Switching Overvoltage Analysis for Modular Multilevel Converters[J]. 2017, 43(4): 1144-1151.
DOI：

LI Hongzhi, HE Zhiyuan, YANG Jie, et al. Switching Overvoltage Analysis for Modular Multilevel Converters[J]. 2017, 43(4): 1144-1151. DOI：

摘要

模块化多电平换流器(MMC)是高压大容量柔性直流(VSC-HVDC)输电工程的核心

换流器设备的参数设计和型式试验需要基于其暂态过电压的分析结果。为此

提出了模块化多电平换流器的操作过电压计算模型。基于±500 k V柔性直流输电工程的系统参数

研究了模块化多电平换流器设备的设计参数对操作过电压的影响

包括避雷器、桥臂电抗器和子模块储能电容器。结果表明:对于模块化多电平换流器

操作过电压分析中起决定作用的故障工况是换流器交流出口单相接地故障、换流器直流出口单极接地故障、和换流器交流出口相间短路故障;避雷器的荷电率增加时

模块化多电平换流器交流侧相对地、直流侧极对地和桥臂端间的最大操作过电压幅值降低;桥臂电抗器的电感值增加时

模块化多电平换流器的交流侧相对地最大操作过电压幅值降低;子模块储能电容器的电容值增加时

模块化多电平换流器直流侧极对地最大操作过电压幅值增加。研究结果可为柔性直流输电工程换流器的设计和试验提供参考。

Abstract

Modular multilevel converter（MMC） is the key of a voltage sourced converter high voltage direct current（VSC-HVDC） transmission project. The parameter design and type test of MMC are based on the results of switching overvoltage analysis. Therefore

an MMC model for switching overvoltage analysis was presented. Based on the system parameters of ±500 k V VSC-HVDC project

influences of design parameters of MMC on switching overvoltage were researched

including surge arrester

arm reactor

and submodule capacitor. The results show that the decisive fault conditions for switching overvoltage analysis of MMC are single phase-to-earth fault on AC side of MMC

pole-to-earth fault on DC side of MMC

and phase-to-phase fault on AC side of MMC. When increasing the charge ratio of the surge arresters

the maximum switching overvoltages of the phase-to-ground on AC side of MMC

of the pole-to-ground on DC side of MMC

and between terminals of MMC arms are decreased. As the arm reactors inductance increases

the maximum switching overvoltage of phase-to-ground on AC side of MMC decreases. In addition

as the submodules capacitor capacitance increases

the maximum switching overvoltage of pole-to-ground on DC side of MMC increases. The research results can provide a reference for the design and test of converters for VSC-HVDC projects.

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