摘要
与正弦波电机相比,具有非正弦反电势波形的多相电机可提升转矩密度,但容错运行时,反电势谐波会产生额外的转矩脉动。为此,该文提出一种非正弦反电势五相永磁同步电机缺相容错控制策略。基于单相开路故障下转矩方程,推导平稳运行时同步坐标系下的电流表达式,给出利用谐波电流抑制转矩脉动的理论依据;并提出在同步旋转坐标系下注入低阶谐波电流,抑制由3次谐波反电势引起的转矩脉动。为了求解最优谐波电流,分别在最小铜耗或最大转矩模式下协同优化电流系数。相比现有方法,该方法在最小铜耗模式下,能够产生相同的定子铜耗;在最大转矩模式下,能够提高转矩输出能力。最后,通过五相永磁同步电机的缺相容错实验,验证所提控制策略的准确性及有效性。
Multi-phase machines with back-EMF harmonics can be utilized to improve the torque density.However,back-EMF harmonics will induce additional torque ripples under post-fault operation.In this paper,a fault-tolerant control strategy for five-phase permanent magnet synchronous machines with non-sinusoidal back-EMF under open-circuit fault is proposed.Based on the torque equation under single-phase open-circuit fault,the general closed-form solution for disturbance-free operation is derived and the theoretical basis for suppressing torque pulsation with harmonic current is given.Therefore,the low-order harmonic currents are injected in the synchronous frame to suppress the torque pulsation caused by the 3^(rd) harmonic back-EMF.To obtain optimal solution,two operation modes are applied,such as minimum copper loss(ML)or maximum output torque(MT),to simultaneously optimize harmonic current coefficients.Compared with the existing method,the proposed method could produce the same copper loss under ML mode and effectively improve torque output capacity under MT mode.Finally,the experiment results for five-phase permanent magnet synchronous machines under postfault operation verify the accuracy and effectiveness.
作者
郭玲玲
王凯
王涛
张建亚
GUO Lingling;WANG Kai;WANG Tao;ZHANG Jianya(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu Province,China;No.63 Institute,National University of Defense Technology,Nanjing 210007,Jiangsu Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第5期1984-1991,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51977109)
宁波市科技创新2025重大专项(2020Z06)
江苏省研究生科研与实践创新计划项目(KYCX21_0214)。
关键词
单相开路故障
反电势谐波
容错控制
谐波电流注入
五相永磁同步电机
single-phase open-circuit fault
back-EMF harmonics
fault-tolerant control
harmonic current injection
five-phase permanent magnet machine