基于桥臂电压变化量的MMC子模块开路故障诊断策略

马文忠; 孙远博; 王玉生; 张文艳; 李恒硕; 朱亚恒

doi:doi:10.19912/j.0254-0096.tynxb.2024-1901

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基于桥臂电压变化量的MMC子模块开路故障诊断策略

更新时间：2026-04-08

- 基于桥臂电压变化量的MMC子模块开路故障诊断策略
- Vol. 47, Issue 3, Pages: 72-79(2026)
- 作者机构：
- 作者简介：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-1901
  CLC： TM615
- Online First：07 April 2026，
  
  Published：2026
- 稿件说明：
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马文忠, 孙远博, 王玉生, et al. 基于桥臂电压变化量的MMC子模块开路故障诊断策略[J]. 2026, 47(3): 72-79.
DOI：

马文忠, 孙远博, 王玉生, et al. 基于桥臂电压变化量的MMC子模块开路故障诊断策略[J]. 2026, 47(3): 72-79. DOI： doi:10.19912/j.0254-0096.tynxb.2024-1901.

摘要

为及时检测子模块开路故障

提出基于桥臂电压变化量的模块化多电平换流器（MMC）开路故障诊断策略

利用两个采样周期内桥臂电压异常增量来判断故障桥臂

在故障桥臂内计算SM电容电压平均值并与各SM电容电压比较

当两者差值超出阈值时

定位故障SM并更新平均值继续检测其余SM是否故障

从而可检测单个及多个SM发生故障的情况

并经过理论分析研究

给出阈值的设定方法。该策略步骤简捷、检测速度快、运算量小

Matlab/Simulink仿真分析和硬件在环系统实验均验证了其可行性和有效性。

Abstract

A sub-module（SM） open-circuit fault

as one of the common faults in Modular Multilevel Converters （MMC） affects the safe and stable operation of the system. To detect faulty SMs in a timely manner

this paper proposes an MMC open-circuit fault diagnosis strategy based on the variation of arm voltages variation. By using the abnormal arm voltage increment of the arm within two sampling periods

the faulty arm is identified. The average SM capacitor voltage within the faulty arm is then calculated and compared with each individual SM capacitor voltage. When the difference exceeds a set threshold

the faulty SM is located

and the average value is updated to continue detecting any remaining faulty SMs

this allows for the detection of both single and multiple SMs faults. Furthermore

a method for setting the threshold is provided based on theoretical analysis.This strategy features simple steps

fast detection speed

and low computational complexity

enabling the detection of both single and multiple SM faults. The feasibility and effectiveness of the proposed method have been validated through MATLAB/Simulink simulation analysis and hardware-in-the-loop （HIL） system experiments.

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references

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