Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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A Fault Diagnosis Method in Cascaded H-bridge Multilevel Inverter Using Output Current Analysis

  • Lee, June-Hee (Dept. of Electrical and Electronic Engineering, Ajou University) ;
  • Lee, June-Seok (Railroad Safety Research Division, Korea Railroad Research Institute) ;
  • Lee, Kyo-Beum (Dept. of Electrical and Electronic Engineering, Ajou University)
  • Received : 2016.12.28
  • Accepted : 2017.09.14
  • Published : 2017.11.01
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Abstract

Multilevel converter topologies are widely used in many applications. The cascaded H-bridge multilevel inverter (CHBMI), which is one of many multilevel converter topologies, has been introduced as a useful topology in high and medium power. However, it has a drawback to require a lot of switches. Therefore, the reliability of CHBMI is important factor for analyzing the performance. This paper presents a simple switch fault diagnosis method for single-phase CHBMI. There are two types of switch faults: open-fault and short-fault. In the open-fault, the body diode of faulty switch provides a freewheeling current path. However, when the short-fault occurs, the distortion of output current is different from that of the open-fault because it has an unavailable freewheeling current flow path due to a disconnection of fuse. The fault diagnosis method is based on the zero current time analysis according to zero-voltage switching states. Using the proposed method, it is possible to detect the location of faulty switch accurately. The PSIM simulation and experimental results show the effectiveness of proposed switch fault diagnosis method.

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References

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