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In this paper, a voltage-current hybrid-signals-based fault diagnosis algorithm is proposed to solve the problem of IGBT open-circuit (OC) faults in three-level motor drive systems for high-voltage and high-power applications. First, combined with circuit and simulation waveform analysis, the fault characteristics under different IGBT OC faults in closed-loop control are extracted. To improve the reliability of the algorithm, the fault criteria for IGBT OC faults in three-level neutral-point-clamped (3L-NPC) inverters suitable for closed-loop control are designed by integrating both voltage and current fault characteristics. If the detected output voltage and current of the inverter meet a certain fault characteristic in the fault criteria, the faulty IGBT can be quickly identified. Experimental results show that the proposed fault diagnosis algorithm can accurately and quickly identify single switch OC faults and two different-phase switch OC faults. The fault diagnosis time is less than one fundamental period. Moreover, the proposed algorithm is simple and reliable enough for engineering implementation.

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Hybrid-Signals-Based IGBT Open-Circuit Fault Diagnosis Algorithm for Three Level Motor Drivers

  • 会议论文

  • 发表日期：

    2026年

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  • Ming Zhang,
  • Xiaowei Cai,
  • Guifang Ma,
  • Shuzhen Tu

摘要

In this paper, a voltage-current hybrid-signals-based fault diagnosis algorithm is proposed to solve the problem of IGBT open-circuit (OC) faults in three-level motor drive systems for high-voltage and high-power applications. First, combined with circuit and simulation waveform analysis, the fault characteristics under different IGBT OC faults in closed-loop control are extracted. To improve the reliability of the algorithm, the fault criteria for IGBT OC faults in three-level neutral-point-clamped (3L-NPC) inverters suitable for closed-loop control are designed by integrating both voltage and current fault characteristics. If the detected output voltage and current of the inverter meet a certain fault characteristic in the fault criteria, the faulty IGBT can be quickly identified. Experimental results show that the proposed fault diagnosis algorithm can accurately and quickly identify single switch OC faults and two different-phase switch OC faults. The fault diagnosis time is less than one fundamental period. Moreover, the proposed algorithm is simple and reliable enough for engineering implementation.