基于最小铜耗和最大转矩的双三相永磁电机单相缺相折衷容错控制

多相电机缺相后仍具有额外的自由度与灵活性，可以在实现无扰运行的同时提高系统性能。传统容错控制策略或是最小化电机定子铜耗或是最大化转矩输出能力，无法同时兼顾电机驱动系统的运行效率与带载能力。为此，本文通过分析容错运行时不同控制方式下的容错性能，提出基于最小铜耗和最大转矩的折衷容错控制策略。为减少缺相前后控制框架的改变，基于正常解耦矢量控制实现对缺相电机的容错控制。通过在谐波平面注入特定的基波平面电流分量，实现了电机缺相后的无扰运行。为实现所提容错控制策略，额外引入权重系数权衡电机驱动系统产生的定子铜耗与转矩输出能力。通过分析权重系数对容错性能的影响，得出结论：相比最小铜耗控制方式，所提容错控制策略带载能力更强；相比最大转矩制方式，所提容错控制策略运行效率更高，即所提容错控制策略在提高带载能力的同时实现效率最优。最后，双三相永磁同步电机的实验验证了所提容错控制策略的准确性及有效性。

Compromise Fault-Tolerant Control Based on Minimum Copper Loss and Maximum Torque for Dual Three-phase Permanent Magnet Synchronous Motors with Single-Phase Open

Multi-phase machines with single-phase open still have additional degrees of freedom and flexibility, which can improve system performance while achieving disturbance-free operation. The traditional fault-tolerant control strategy either minimizes stator copper loss or maximizes torque output capacity, and cannot take into account efficiency and torque density simultaneously. To solve this problem, the fault-tolerant performance of different control modes under fault-tolerant operation is analyzed and a compromise fault-tolerant control strategy based on the minimum copper loss and the maximum torque is proposed. In order to reduce the change of the control framework pre- and post-fault, the fault-tolerant control is realized based on the normal decoupling vector control. By injecting specific fundamental plane current components into the harmonic plane, the disturbance-free operation is realized. For the proposed fault-tolerant control strategy, an additional weight coefficient is introduced to compromise the operating efficiency and load capacity. Through analyzing the influence of the weight coefficient on the fault-tolerant performance, it can be concluded that compared with the minimum copper loss control method, the proposed fault-tolerant control strategy has stronger load capacity; compared with the maximum torque system, the proposed fault-tolerant control strategy has higher operating efficiency. That is, the proposed fault-tolerant control strategy achieves the best efficiency while improving the load capacity. Finally, the experiment on dual three-phase permanent magnet synchronous machines verifies the accuracy and effectiveness of the proposed fault-tolerant control strategy.