Transactions of China Electrotechnical Society  2022, Vol. 37 Issue (8): 1972-1981    DOI: 10.19595/j.cnki.1000-6753.tces.201268
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Inter-Phase Short-Circuit Fault-Tolerant Control for Five-Phase Permanent Magnet Fault-Tolerant Motors
Gu Licheng1,2, Chen Qian1,2, Zhao Wenxiang1,2, Liu Guohai1,2, Xia Yuhang1,2
1. School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China;
2. National Center for International Research on Structural Health Management of Critical Components Zhenjiang 212013 China

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Abstract  

After occurring a short-circuit fault in a permanent magnet motor, the short-circuit current increases sharply in the motor, and the motor system will lose stability, threatening the operational safety of major equipment. Compared with other short-circuit faults, the inter-phase short-circuit is the most destructive. For this serious fault, an inter-phase short-circuit fault-tolerant control of a five-phase fault-tolerant permanent magnet motor (FTPMM) is proposed. Aiming at stable output torque, the proposed method starts from eliminating the two negative effects of phase loss and short-circuit current caused by inter-phase short-circuit, and constructs the optimal fault-tolerant current. Using the fundamental reduction order matrix with the same magnetomotive force before and after fault, the non-fault phase current is reconstructed to compensate for the torque loss and torque ripple caused by the loss of phase under the inter-phase short circuit. Further, the compensation current is injected into the non-faulty phases, and the torque pulsation caused by the short-circuit current is suppressed based on the principle that the sum of the magnetomotive force of the injected current and the short-circuit current is zero. The superposition principle is used to synthesize the required fault-tolerant current, and the switching frequency of the proposed fault-tolerant control is fixed through the carrier pulse width modulation technology. Finally, the correctness and feasibility of the proposed control strategy are verified by measuring the dynamic and static characteristics of a 20-slot/14-pole five-phase FTPMM under fault and fault-tolerant operation.
Key words： Five-phase fault-tolerant permanent magnet motor (FTPMM)      inter-phase short circuit      phase loss      fundamental reduction matrix     
Received: 22 September 2020     
PACS: TM351  
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Gu Licheng
Chen Qian
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Liu Guohai
Xia Yuhang
Cite this article:   
Gu Licheng,Chen Qian,Zhao Wenxiang等. Inter-Phase Short-Circuit Fault-Tolerant Control for Five-Phase Permanent Magnet Fault-Tolerant Motors[J]. Transactions of China Electrotechnical Society, 2022, 37(8): 1972-1981.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201268     OR     https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I8/1972
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