Fault Path Analysis and Diagnosis Method of Switching Device Fault for Four-level Hybrid-clamped Converters

PAN Jianyu; XIAO Junwei; FU Xiaojie; YAN Sheng; LI Zhijin; XIONG Zhonghao; ZHOU Fenqiang

doi:10.13334/j.0258-8013.pcsee.251544

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Fault Path Analysis and Diagnosis Method of Switching Device Fault for Four-level Hybrid-clamped Converters

更新时间：2026-10-05

- Fault Path Analysis and Diagnosis Method of Switching Device Fault for Four-level Hybrid-clamped Converters
- Vol. 46, Issue 12, Pages: 5083-5093(2026)
- 作者机构：
  
  1. 1 输变电装备技术全国重点实验室(重庆大学)，重庆市沙坪坝区,400044
  2. 2 中国大唐集团数字科技有限公司，河北省雄安新区,070001
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.251544
  CLC：
- Published：2026
- 稿件说明：
移动端阅览
PAN Jianyu, XIAO Junwei, FU Xiaojie, et al. Fault Path Analysis and Diagnosis Method of Switching Device Fault for Four-level Hybrid-clamped Converters[J]. 2026, 46(12): 5083-5093.
DOI：

PAN Jianyu, XIAO Junwei, FU Xiaojie, et al. Fault Path Analysis and Diagnosis Method of Switching Device Fault for Four-level Hybrid-clamped Converters[J]. 2026, 46(12): 5083-5093. DOI： 10.13334/j.0258-8013.pcsee.251544.

摘要

混合式四电平变流器(4-level hybrid-clamped converter，4L-HCC)以其高效和高功率密度特点在中高压大功率变流系统具有良好应用前景，然而，其特殊结构和多电流路径导致其内部开关器件故障难以识别。文中首先构建4L-HCC多开关状态下的电流路径演变模型，揭示开关器件开路故障下电流演变路径，阐明故障前后电容电压与输出电流畸变特性；在此基础上，提出一种多监测参量融合的器件开路故障诊断方法，明晰关键诊断参量阀值设定依据；最后，通过构建的4L-HCC试验平台和多工况测试对所建模型和诊断方法进行验证，结果表明，所提方法能有效识别三相4L-HCC 24个开关器件所有开路故障，准确率达97.53%，定位时间在20 ms以内。

Abstract

The 4-level hybrid-clamped converter (4L-HCC) offers promising applications in medium/high-voltage

high-power systems due to its high efficiency and power density. However

its complex structure and multiple current paths make switch open-circuit faults difficult to identify. This paper first establishes a current path evolution model under multiple switching states

revealing fault current paths and analyzing capacitor voltage/output current distortion characteristics before and after faults. Subsequently

a multi-parameter fusion diagnosis method for open-circuit faults is proposed

clarifying key diagnostic thresholds. Finally

experimental validation on a 4L-HCC test platform under various conditions demonstrates that the method effectively identifies all switch open-circuit faults with 97.53% accuracy and sub-20 ms localization time.

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