Fault diagnosis scheme for open-circuit faults in switched reluctance motor drives using fast Fourier transform algorithm with bus current detection

Reliability of power converters is of crucial importance in switched reluctance motor drives used for safety-critical applications. Open-circuit faults in power converters will cause the motor to run in unbalanced states, and if left untreated, they will lead to damage to the motor and power modules...

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Bibliographic Details
Published in:	IET power electronics Vol. 9; no. 1; pp. 20 - 30
Main Authors:	Gan, Chun, Wu, Jianhua, Yang, Shiyou, Hu, Yihua, Cao, Wenping, Si, Jikai
Format:	Journal Article
Language:	English
Published:	The Institution of Engineering and Technology 20.01.2016
Subjects:	Algorithms asymmetrical half‐bridge converter blackman window interpolation bus current spectrum detection bus positions Buses (vehicles) catastrophic failure circuit reliability double phase fundamental frequency component electric sensing devices fast Fourier transform algorithm fast Fourier transforms Fault diagnosis fault diagnosis scheme Faults Fourier transforms Motors open‐circuit fault detection power converter reliability Power converters power convertors power modules Reluctance reluctance motor drives rotor position rotors safety‐critical applications single current sensor single‐phase open faults switched reluctance motor drives two‐phase open faults unbalanced states fast Fourier transforms fault diagnosis unbalanced states power modules double phase fundamental frequency component blackman window interpolation bus positions open-circuit fault detection circuit reliability power converter reliability fast Fourier transform algorithm catastrophic failure reluctance motor drives rotor position single-phase open faults power convertors rotors safety-critical applications asymmetrical half-bridge converter fault diagnosis scheme switched reluctance motor drives bus current spectrum detection single current sensor electric sensing devices two-phase open faults
ISSN:	1755-4535, 1755-4543
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Summary:	Reliability of power converters is of crucial importance in switched reluctance motor drives used for safety-critical applications. Open-circuit faults in power converters will cause the motor to run in unbalanced states, and if left untreated, they will lead to damage to the motor and power modules, and even cause a catastrophic failure of the whole drive system. This study is focused on using a single current sensor to detect open-circuit faults accurately. An asymmetrical half-bridge converter is considered in this study and the faults of single-phase open and two-phase open are analysed. Three different bus positions are defined. On the basis of a fast Fourier transform algorithm with Blackman window interpolation, the bus current spectrums before and after open-circuit faults are analysed in details. Their fault characteristics are extracted accurately by the normalisations of the phase fundamental frequency component and double phase fundamental frequency component, and the fault characteristics of the three bus detection schemes are also compared. The open-circuit faults can be located by finding the relationship between the bus current and rotor position. The effectiveness of the proposed diagnosis method is validated by the simulation results and experimental tests.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1755-4535 1755-4543
DOI:	10.1049/iet-pel.2014.0945