Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Current covariance analysis-based open-circuit fault diagnosis for voltage-source-inverter-fed vector-controlled induction motor drives

  • Yang, Huanwen (Key Laboratory of Imaging Processing and Intelligence Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology) ;
  • Zhou, Yang (Key Laboratory of Imaging Processing and Intelligence Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology) ;
  • Zhao, Jin (Key Laboratory of Imaging Processing and Intelligence Control, School of Artificial Intelligence and Automation, Huazhong University of Science and Technology)
  • Received : 2019.05.23
  • Accepted : 2019.10.11
  • Published : 2020.03.20
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Abstract

In recent years, a faulty leg is mostly replaced by a healthy leg for current fault-tolerant control of power converters, and its fault diagnosis only needs to confirm the fault leg. For fault-tolerant control, this paper proposed a real-time, robust and accurate diagnosis method for the legs of insulated gate bipolar transistor open-circuit faults in the pulse-width-modulated voltage source inverters for vector-controlled induction motors based on three-phase current. The covariance of three-phase current is used to diagnose and locate faults by analyzing the correlation between them, and its performance is explained specifically under both health condition and fault conditions. The proposed method is simple and no additional current or voltage sensors are required. The fault diagnosis time is about half a current cycle. Experiments are conducted and the obtained results demonstrate the effectiveness and merit of the proposed method.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China under Grant 61573159, 61273174, and Provincial Science and technology plan project of Guangdong (2017B010118001).

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