Journal of Electrical Engineering ›› 2015, Vol. 10 ›› Issue (5): 51-60.

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Fault Diagnosis Strategy in Two-Stage Matrix Converter Based on Switch Group Error Voltage

Deng Wenlang,Huang Siyao,Guo Yougui,Liu He,Yu shuai   

  1. Xiangtan University Xiangtan 411105 China
  • Received:2014-11-13 Online:2015-05-25 Published:2015-05-25

Abstract:

MC is constituted by a large number of power switch, These power switch elements used in a variety of complex environment and high frequency switching circuit system, and increased the possibility of power switch failure, but also reduced the reliability of MC system. Power switch failure has become one of the main factors hindering MC topology into engineering application, on-line fault diagnosis and appropriate fault-tolerant control can effectively improve the reliability of MC system. This paper research in fault diagnosis strategy when TSMC’s power switch in open-circuit fault, then deeply analyzed TSMC’s operation mode and fault characteristics of output voltage, DC voltage, defined the concept of switch group error voltage(SGEV), provides the methods to locate the fault switch according to output voltage error, switch signal and DC voltage. The proposed methods has many advantages, such as accurate diagnosis, fast detection, independent of the modulation strategy and unaffected by the load condition, etc. The simulation results has verified the validity of the theoretical analysis and the effectiveness of the fault diagnosis strategy.

Key words: Two-stage matrix converter, the output voltage error, switch group error voltage, DC voltage, fault diagnosis

CLC Number: