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Joint Diagnosis Method for IGBT Open-circuit Fault and Voltage Sensor Fault in MMC Submodule
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Jingwei LIU1, Jianjun MA  Member, CPSS2, Yang CHEN3, Miao ZHU1, Shuli WEN1
Journal of Power Supply | 2025, 23(8) : 329 - 341
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Journal of Power Supply | 2025, 23(8): 329-341
• Reliability and Diagnostics •
Joint Diagnosis Method for IGBT Open-circuit Fault and Voltage Sensor Fault in MMC Submodule
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Jingwei LIU1, Jianjun MA  Member, CPSS2, Yang CHEN3, Miao ZHU1, Shuli WEN1
Affiliations
  • 1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2.College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3.Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
Published: 2025-12-30 doi: 10.13234/j.issn.2095-2805.2025.8.329
Outline
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In a modular multilevel converter (MMC) system, there are numerous submodules, and switch faults and voltage sensor faults occur frequently. Some of these faults share similar characteristics, which can affect the system’s operation reliability. A joint diagnosis method for submodule IGBT open-circuit faults and voltage sensor faults based on a sliding mode observer is proposed. First, a fault detection strategy is designed using the actual and measured values of the MMC system’s arm voltage to detect faults in the MMC system and further achieve fault localization at the arm level. On this basis, the sliding mode observer is used to perform online estimation of the capacitor voltage within the faulted arm submodule, and the estimated values are compared with the measured values for submodule-level fault localization. Finally, simulation results verify the effectiveness and robustness of the proposed fault diagnosis algorithm.

Modular multilevel converter (MMC) submodule  /  fault diagnosis  /  IGBT open-circuit fault  /  voltage sensor fault  /  sliding mode observer
刘靖伟, 马建军中国电源学会会员, 陈阳, 朱淼, 文书礼. MMC子模块IGBT开路故障与电压传感器故障联合诊断方法. 电源学报, 2025 , 23 (8) : 329 -341 . DOI: 10.13234/j.issn.2095-2805.2025.8.329
Jingwei LIU, Jianjun MA, Yang CHEN, Miao ZHU, Shuli WEN. Joint Diagnosis Method for IGBT Open-circuit Fault and Voltage Sensor Fault in MMC Submodule[J]. Journal of Power Supply, 2025 , 23 (8) : 329 -341 . DOI: 10.13234/j.issn.2095-2805.2025.8.329
Funding
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  • National Natural Science Foundation of China(U2166216)
Appendix
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Year 2025 volume 23 Issue 8
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.8.329
  • Receive Date：2025-01-16
  • Online Date：2026-10-26
  • Published：2025-12-30
Article Data
Affiliations
History
  • Received：2025-01-16
  • Revised：2025-03-21
  • Accepted：2025-04-12
Funding
National Natural Science Foundation of China(U2166216)
Affiliations
    1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
    2.College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, China
    3.Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
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