双三相永磁同步电机的缺相自然容错控制优化方法

doi:10.19595/j.cnki.1000-6753.tces.250391

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Abstract Due to the demands for enhanced power output and operational reliability in aerospace, marine propulsion, and electric vehicles, dual-three-phase permanent magnet synchronous motors (DTP-PMSM) have attracted considerable attention due to their high reliability, large power capacity, and low torque ripple. Their strong tolerance to phase loss is a core advantage, making the development of simple yet efficient fault-tolerant control strategies and performance optimization imperative. Among existing fault-tolerant control technologies, the reduced-order decoupling transformation fault-tolerant strategy has notable limitations. Under various phase-loss fault modes—such as single-phase or two-phase open-circuit faults—it is necessary to reconstruct mathematical models and control equations for each fault topology. It lengthens the control development cycle and reduces real-time control accuracy due to the complexity of model switching, resulting in substantial computational overhead. By contrast, natural fault-tolerant control allows direct reuse of the decoupling transformation matrix from normal operating conditions, enabling fault-tolerant operation after a fault through harmonic current regulation alone, without the need to reconstruct the control framework. Thus, it has attracted widespread research interest. However, most natural fault-tolerant strategies overlook the impacts of open-phase conditions. Such unaddressed factors lead to current distortion and aggravated torque ripples after a fault, ultimately resulting in a marked decline in fault-tolerant performance. Therefore, this paper proposes an optimization method for natural fault-tolerant control under phase-loss faults.
To address the post-fault control degrees of freedom, a matching relationship between the number of open phases and the number of current control loops is defined to ensure controllability. To address the decoupling failure of fundamental and harmonic currents, a harmonic-current configuration scheme based on a linear combination of fundamental currents is proposed. By integrating constraints such as equal current amplitudes in healthy phases and minimal stator copper loss, the optimal fault-tolerant current configuration is derived. For a fault-tolerant voltage configuration, this paper presents a precise optimal calculation method based on the harmonic/zero-sequence spatial current model. Meanwhile, a technical solution is proposed that integrates neutral-point voltage calculation and compensation. Experiments were carried out on a dual three-phase motor control test platform. After a single-phase open-circuit fault, the proposed fault-tolerant current configuration markedly optimized current waveforms. Combined with the fault-tolerant voltage configuration and neutral-point voltage compensation strategy, both neutral-point voltage and d-q-axis current fluctuations of the motor were suppressed. Extending this method to scenarios with multi-phase open-circuit faults maintained stable, reliable optimization performance.
The following core conclusions are: (1) The current configuration coefficients in the x-y and o₁-o₂ spaces can be easily solved by the proposed optimization method, laying a foundation for the accurate configuration of fault-tolerant currents. (2) The voltage in the harmonic/zero-sequence subspace possesses forced motion characteristics, and the fault-tolerant control performance can be optimized via targeted parameter configuration of this subspace. (3) The neutral point voltage compensation strategy not only effectively enhances the operational performance after fault-tolerant control but also boasts a straightforward calculation approach. Meanwhile, this method applies to dual three-phase motors with isolated neutral points and to other multi- three-phase motor scenarios, such as nine-phase motors.

Key words： Dual three-phase permanent magnet synchronous motor natural decoupling open-phase fault-tolerant control fault-tolerant current fault-tolerant voltage neutral point voltage

Received: 12 March 2025

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TM301.2

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	Huang Tao
	Zhang Juntao
	Han Zhenmao
	Tian Bing

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Huang Tao,Zhang Juntao,Han Zhenmao等. Optimization of the Natural Open-Fault Tolerant Control for a Dual Three-Phase Permanent Magnet Synchronous Motor[J]. Transactions of China Electrotechnical Society, 2026, 41(8): 2601-2615.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250391 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I8/2601

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