Virtual-Stator-Flux-Based Direct Torque Control of Five-Phase Fault-Tolerant Permanent-Magnet Motor With Open-Circuit Fault
Virtual-Stator-Flux-Based Direct Torque Control of Five-Phase Fault-Tolerant Permanent-Magnet Motor With Open-Circuit Fault
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DOI：
10.1109/tpel.2019.2942397
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发表时间：
2020-05
影响因子：
6.7
通讯作者：
Huawei Zhou;Cheng Zhou;Weiguo Tao;Jiabin Wang;Guohai Liu
中科院分区：
文献类型：
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作者：
Huawei Zhou;Cheng Zhou;Weiguo Tao;Jiabin Wang;Guohai Liu
五相容错永磁 (FTPM) 电机可提供高扭矩密度、低扭矩脉动和良好的容错能力。为了提高开路故障条件下的运行性能，本文提出了一种基于虚拟定子磁通策略的新型直接扭矩控制（DTC），用于 FTPM 电机驱动。该策略的新颖之处在于虚拟定子磁通的开发，该虚拟定子磁通用于实现电流和旋转磁动势矢量的圆形轨迹，并导出前馈电压。此外，基于最大扭矩准则导出最佳容错电流参考，然后结合由此推导出的降阶正交分解矩阵，使用前馈电压来消除故障条件下的不对称电机行为。因此，DTC 适用于开路故障条件下的 FTPM 电机驱动器。这种控制策略不仅通过平滑的扭矩和高动态响应来增强扭矩性能，而且还允许控制结构从健康运行到容错运行的最小重新配置。仿真和实验结果验证了所提策略的可行性。
A five-phase fault-tolerant permanent-magnet (FTPM) motor can offer high torque density, low torque ripple, and good fault-tolerance. To improve operational performance under open-circuit fault condition, this article proposes a novel direct torque control (DTC) based on virtual stator flux strategy for an FTPM motor drive. The novelty of the proposed strategy is the development of virtual stator flux, which is used to achieve circular trajectories of current and rotating magneto-motive force vectors, and to derive feedforward voltage. Additionally, optimal fault-tolerant current references get derived based on maximum torque criterion, and then combined with reduced-order orthogonal decomposition matrices deduced from them, the feedforward voltage is used to eliminate asymmetrical motor behavior under the fault condition. Hence, the DTC becomes applicable to the FTPM motor drive under open-circuit fault condition. This control strategy not only enhances the torque performance with smooth torque and high dynamic response but also allows minimal reconfiguration of the control structure from healthy operation to fault-tolerant operation. The simulation and experimental results are given to verify the feasibility of the proposed strategy.