Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Lifetime-based fault tolerant strategy for three-level hybrid ANPC inverters

  • Jun‑Ho Hwang (Department of Electrical and Computer Engineering, Ajou University) ;
  • Laith M. Halabi (Department of Electrical and Computer Engineering, Ajou University) ;
  • Youngjong Ko (Department of Electrical Engineering and Industry 4.0 Convergence Bionics Engineering, Pukyong National University) ;
  • Kyo‑Beum Lee (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2022.06.07
  • Accepted : 2022.10.30
  • Published : 2023.02.20
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Abstract

This paper presents a fault tolerant control that aims at improving the reliability of three-level hybrid ANPC inverters. Since the hybrid ANPC inverter consists of Si devices and SiC devices have a higher output quality and lower power losses, it has been considered in various power conversion industries. However, there still are concerns over its reliability since employing many power devices increased the risk of failure. Furthermore, the inverter is composed of a switching device and a DC-link capacitor, which mainly determine the reliability of the system. As one of the strategies to improve reliability, fault tolerant control methods have been intensively studied. However, applying the fault tolerant control increases the power losses of the switching device or the DC-link capacitor, which leads to earlier second failures. This paper proposes a lifetime-based fault tolerant strategy considering the remaining useful lifetime of the power device and DC-link capacitor, which increases the lifetime of the whole system. The validity and effectiveness of the proposed fault tolerant control method are verified through simulation and experimental results.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2020R1G1A1100406) and by Korea Electric Power Corporation (Grant number: R21XO01-11).

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