Fault diagnosis and tolerant control for power converter in SRM drives

The Journal of Engineering

Nasir Ali¹  Cai Xu²  Qiang Gao³ 

[1] Department of Electrical Engineering , Shanghai Jiao Tong University , Shanghai , People'Department of Power Electrical System , University of Zilina , Zilina , Slovakia;s Republic of China

关键词: additional sensors;    switched reluctance motor drives;    power transistor faults;    fault-tolerant capabilities;    three-phase 12/8 SRM drive;    online fault diagnostic algorithm;    existing strategies;    electric aircraft;    power converter;    fault-tolerant control strategy;    robust configuration;    real-time fault diagnosis;    automotive applications;    system reliability;    asymmetric converter;    short-circuit faults;    fault-tolerant topology;    relay network;    open-circuit faults;    upper switches;    fault signatures;    fault diagnosis;    tolerant control;    power switches;    high-frequency signal injection;    crucial feature;    results;   

DOI  :  10.1049/joe.2018.0012

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Switched reluctance motors (SRMs) are considered a competitive technology for more electric aircraft and automotive applications due to their excellent fault-tolerant capabilities and robust configuration. In such applications, system reliability is a crucial feature. Therefore, here, a new fault-tolerant control strategy with real-time fault diagnosis for power transistor faults in SRM drives is proposed. The developed fault-tolerant topology is composed of four additional power switches and a relay network based on the conventional asymmetric converter. Moreover, an online fault diagnostic algorithm based on high-frequency (HF) signal injection is proposed. In contrast to the existing strategies that use additional sensors, this diagnostic algorithm extracts the fault signatures from the fundamental current by injecting an HF voltage signal into the upper switches of the asymmetric converter. Open- and short-circuit faults of the power switches are analysed by monitoring the variation in frequency and amplitude of the resulting HF current along with the amplitude variation in fundamental current with the occurrence of fault. Simulations performed on a three-phase 12/8 SRM drive and results are presented to validate the effectiveness of the proposed strategy.

【 授权许可】

CC BY