基于离散傅里叶变换的永磁同步电机驱动系统电流测量偏置误差在线补偿方法  

Online Current Measurement Offset Error Compensation Method for PMSM Drive System Based on Discrete Fourier Transform

作　　者：张军 张杰 龙江 ZHANG Jun;ZHANG Jie;LONG Jiang(GSK CNC Equipment Co.,Ltd.,Guangzhou Guangdong 510530,China;School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin Heilongjiang 150001,China)

机构地区：[1]广州数控设备有限公司,广东广州510530 [2]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《机床与液压》2022年第23期114-118,共5页Machine Tool & Hydraulics

基　　金：国家发改委重大技术装备攻关工程。

摘　　要：电流反馈信息的准确测量是永磁同步电机驱动系统高性能运行的重要前提。对于实际控制系统,由于器件温漂、老化和非线性等各种因素,电流传感器和相关调理电路会出现电流测量误差,其中电流测量偏置误差将引起频率为一倍电频的转矩与转速脉动,降低永磁同步电机控制性能。在详细分析电流测量偏置影响的基础上,探究闭环控制对电流谐波幅值的影响,指出闭环控制系统将影响电流谐波幅值,传统分析结果不再成立。针对这一问题,提出一种基于离散傅里叶变换的永磁同步电机驱动系统电流测量偏置误差在线补偿方法。在电机运行过程中实时提取电流脉动并有针对性地进行电流测量误差补偿,以消除由于测量偏置误差导致的转矩与转速脉动。与传统方法相比,所提方法无需定子电阻或转动惯量等电机参数。最后,通过数控机床用交流永磁同步电机验证了所提算法的有效性。Accurate measurement of current feedback is an important prerequisite for high performance permanent magnet synchronous motor(PMSM) drive system.For the actual control system, due to the thermal drift, aging, nonlinearity and some other factors of the current sensors and the corresponding conditioning circuits, current measurement error will occur, more specifically, the current measurement offset error will result in torque and speed ripple whose frequency is one time of electric frequency, and this may deteriorate the PMSM control performance.On the basis of analyzing the influence of current measurement offset error, the influence of closed-loop control to the current ripple amplitude was studied, and it was pointed out that the traditional deduction could not stand when the influence of closed-loop was considered.Aiming at this issue, an online current measurement offset error compensation for PMSM drive system based on discrete Fourier transform was proposed.In the proposed method, the current ripple was extracted and the current measurement offset error was compensated during the motor operation in order to suppress the torque and speed ripple caused by current measurement error.Compared with the traditional methods, the proposed scheme did not need the information of motor shaft inertia or stator resistance.Finally, the effectiveness of the proposed algorithm is verified through PMSM used in CNC machine tools.

关 键 词：永磁同步电机 电流测量误差 偏置误差 转矩脉动抑制 

分 类 号：TM341[电气工程—电机]