Remedy Strategy for Five-Phase FTPMMs Under Single-Phase Short-Circuit Fault by Injecting Harmonic Currents From Third Space

• Published in: IEEE transactions on power electronics 2022-09, Vol.37 (9), p.11152-11163
• Main Authors: Chen, Qian, Gu, Licheng, Wang, Jiabin, Zhao, Wenxiang, Liu, Guohai
• Format: Article
• Language: English
• Subjects: Aerospace electronics; Circuit faults; Circuits; Fault tolerance; Fault tolerant systems; Fault-tolerant control; five-phase fault-tolerant permanent-magnet (PM) fault-tolerant motors; Harmonic analysis; harmonic current; Permanent magnets; Ripples; Short circuit currents; short-circuit fault; third space; Torque
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2022.3162847

This article proposes a new fault-tolerant control for five-phase fault-tolerant permanent-magnet motors under single-phase short-circuit fault. In the proposed method, the effect on torque performance caused by a short-circuit fault is attributed into two parts: the loss of the short-circuited phase, which is equivalent to a phase open-circuit fault, and the resultant short-circuit current. The remedial action for loss of a phase is realized in the fundamental space, while the torque ripple caused by the short-circuit current is compensated by the harmonic currents in the third space. To decouple the control of the fundamental and third space, the reduced-order Clarke and Park transformation matrixes for the two spaces are obtained separately under single-phase short-circuit fault. Afterward, the fundamental currents with minimum joule losses or equal joule losses for loss of a phase, and the harmonic currents in the third space for torque ripple reduction are derived. Hence, the proposed method can realize torque ripple-free operation under single-phase short-circuit fault. Finally, the effectiveness of the proposed method is verified by experimental results under various operational conditions.