Fault-Tolerant Control Strategy with Asymmetric Phase Currents for Single to Four-Phase Open-Circuit Faults of Six-Phase PMSM

Chen Huang, Lidan Zhou, Zujia Cao and Gang Yao
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Chen Huang: Science and Technology on Electromagnetic Compatibility Laboratory, China Ship Development and Design Centre, Wuhan 430064, China
Lidan Zhou: Key Laboratory of Control of Power Transmission and Transformation, Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zujia Cao: School of Electric Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Gang Yao: Key Laboratory of Control of Power Transmission and Transformation, Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Energies, 2021, vol. 14, issue 11, 1-18

Abstract: Multi-phase motors and generators are regarded with great fault tolerance capability, especially on open-circuit faults. Various mathematics analytical methods are applied for their fault control. In this paper, a fault-tolerant control strategy with asymmetric phase current for the open-circuit faults with arbitrary phases in the six-phase PMSM (six-phase permanent magnetic synchronous motor, 6P-PMSM) system, is proposed for better electrical and dynamical performance of the machine. An innovative mathematical model for PMSM under one to four-phase-open circuit faults are established considering the asymmetry of the machine. Combining with time-varying relations in machines’ working conditions, targeted decoupling transformation matrixes of every kind of open-circuit faults are settled by voltage equations under different faults. Modified control strategy with a connection between the neutral point and the inverter’s DC side is presented, which aims at increasing the system redundancy and reducing the amplitude of phase currents. Besides, improved control loops with two layers are put forward as well, with which the PMSM system acquires fewer harmonics in phase current and smoother electromagnetic torque. Simulation and experimental results of open-circuit faults are provided for verification of the theoretical analysis.

Keywords: multi-phase; dual three-phase PMSM; fault-tolerance; asymmetry of the machine; improved control loops (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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