具有零序电流自矫正的六相永磁同步电机直接转矩控制  

Direct Torque Control for Six-phase Permanent Magnet Synchronous Motor With Zero-sequence Current Self-adjust

作　　者：周扬忠[1] 程明[1] 熊先云[2] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]福州大学电气工程与自动化学院,福建省福州市350108

出　　处：《中国电机工程学报》2015年第10期2504-2512,共9页Proceedings of the CSEE

基　　金：江苏省博士后科研资助计划(1301010A);国家973计划项目(2013CB035603);中国博士后科学基金(2013M541583)~~

摘　　要：逆变器死区、功率管导通压降及开关过渡过程等非线性因素易导致直接转矩控制(direct torque control,DTC)多相永磁同步电机定子电流严重畸变。该文针对六相对称偏置60°定子绕组永磁同步电机提出一种DTC策略。首先,基于零序电流等于零思想进行电压矢量重构,并由此提出理想DTC;其次,基于死区补偿原理对实际电压矢量作用时间进行离散补偿;最后,利用PI调节器对电压矢量作用时间进行连续补偿,实现零序电流等于零目的。实验结果表明该文提出的驱动控制系统具有快速的转矩动态响应特性;同时零序电流基本等于零,定子电流总谐波含量较低。There may be serious distortion in stator currents of multi-phase permanent magnet synchronous motor with direct torque control （DTC） because of the nonlinear factors such as inverter dead-zone, power switch voltage drop and switching transition. A novel DTC was proposed for six-phase symmetric winding phase-shifted by a 60 degree permanent magnet synchronous motor. Firstly, the synthesized voltage vectors were determined to achieve the zero-sequence current, and the ideal DTC strategy was proposed based on the synthesized vectors. Secondly, the factual voltage vector operating time was compensated according to the principle of dead-zone compensation. At last, the voltage vector operating time was regulated continuously by a proportion-integral controller aiming at zero zero-sequence current. The experimental results show that the presented DTC has fast response of torque and the total harmonics is very small due to very lower zero-sequence current.

关 键 词：直接转矩控制(DTC) 六相对称绕组永磁同步电机 零序电流 死区补偿 PI控制 

分 类 号：TM343[电气工程—电机]