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http://dx.doi.org/10.6113/JPE.2016.16.4.1415

A Real-Time Method for the Diagnosis of Multiple Switch Faults in NPC Inverters Based on Output Currents Analysis  

Abadi, Mohsen Bandar (Instituto de Telecomunicacoes and Department of Electrical and Computer Engineering, University of Coimbra)
Mendes, Andre M.S. (Instituto de Telecomunicacoes and Department of Electrical and Computer Engineering, University of Coimbra)
Cruz, Sergio M.A. (Instituto de Telecomunicacoes and Department of Electrical and Computer Engineering, University of Coimbra)
Publication Information
Journal of Power Electronics / v.16, no.4, 2016 , pp. 1415-1425 More about this Journal
Abstract
This paper presents a new approach for fault diagnosis in three-level neutral point clamped inverters. The proposed method is based on the average values of the positive and negative parts of normalized output currents. This method is capable of detecting and locating multiple open-circuit faults in the controlled power switches of converters in half of a fundamental period of those currents. The implementation of this diagnostic approach only requires two output currents of the inverter. Therefore, no additional sensors are needed other than the ones already used by the control system of a drive based on this type of converter. Moreover, through the normalization of currents, the diagnosis is independent of the load level of the converter. The performance and effectiveness of the proposed diagnostic technique are validated by experimental results obtained under steady-state and transient conditions.
Keywords
AC drive; Fault location; Multiple faults; NPC inverter; Open-circuit faults;
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Times Cited By KSCI : 6  (Citation Analysis)
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