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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 3    March 2019

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A new approach for on-line open-circuit fault diagnosis of inverters based on current trajectory
LI Kai-di(李凯迪)1, CHEN Chun-yang(陈春阳)1, CHEN Te-fang(陈特放)1, CHENG Shu(成庶)1, WU Xun(伍珣)2, XIANG Chao-qun(向超群)1

1. School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China;
2. School of Automation, Central South University, Changsha 410083, China

Abstract:Security and reliability of inverter are an indispensable part in power electronic system. Faults of inverter are usually caused by switch elements’ operating fault. Taking the inverter with hysteresis current control as the research object, a universal open-circuit fault location method which can be applied to multiple control strategies is proposed in the paper. If the switch open-circuit fault happens in inverter, the output phase current will inevitably change, which can be used as a characteristic for diagnosis, combined with the comparison of phase-current direction before and after the fault occurrence, to diagnose and locate the open-circuit fault in a half cycle. Moreover, this method requires neither system control signals nor sensor. The validity, reliability and limitation of the fault location method in the paper are verified and analyzed through dSPACE-based experiment platform.

 

Key words: fault diagnosis; hysteresis; inverter; fault location

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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