基于自然容错开关表的五相永磁同步电机直接转矩控制  

Natural Fault-tolerant Switching-table-based DTC for Five-phase PMSM

作　　者：周华伟[1] 陈铖 赵宇恒 江光耀 张多[1] ZHOU Huawei;CHEN Cheng;ZHAO Yuheng;JIANG Guangyao;ZHANG Duo(School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu Province,China)

机构地区：[1]江苏大学电气信息工程学院,江苏省镇江市212013

出　　处：《中国电机工程学报》2024年第4期1618-1628,I0031,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877100);江苏高校“青蓝工程”。

摘　　要：五相永磁同步电机(permanent-magnetsynchronous motor,PMSM)传统直接转矩控制(direct torque control,DTC)存在相电流畸变严重、共模电压(common-modevoltage,CMV)高、转矩和磁链脉动大等问题,且无法实现相开路故障情况下的无扰运行。为解决上述问题,提出一种基于自然容错开关表的DTC策略。该策略根据PMSM开路故障前后基电压矢量的特点以及三次平面合成电压矢量为零的原则,构建虚拟矢量(virtual vector,VV),设计故障前后同一套自然容错开关表,进而不但抑制了故障导致的转矩脉动,而且在故障前后均能降低三次谐波电流、减小转矩和磁链脉动、抑制CMV。实验结果验证所提策略的可行性。Five-phase permanent-magnet synchronous motor(PMSM)with traditional direct torque control(DTC)has such problems as large harmonic currents,high common-mode voltage(CMV),large torque and flux linkage ripples,and unsmooth operation under open-circuit fault.To solve these problems,a natural fault-tolerant switching-table-based DTC strategy is proposed.According to the fundamental voltage vector distribution characteristics under pre-and post-fault conditions and the principle that synthetic voltage vectors are zero in the third subspace,virtual vectors(VVs)are built,and then the same set of natural fault-tolerant switching-tables for pre-and post-faults are designed.Therefore,not only the torque fluctuations caused by open-circuit fault can be restrained,but also the third harmonic currents and CMV can be suppressed,and the ripples of torque and flux can be reduced both under healthy and fault conditions.The feasibility of proposed strategy is verified by the experimental results.

关 键 词：共模电压 直接转矩控制 容错开关表 单相开路故障 永磁同步电机 虚拟矢量 

分 类 号：TM341[电气工程—电机]