抑制汽车EPS-PMSM谐波电流的可变阶跃函数补偿方法  

Variable step function compensation method forsuppressing harmonic current in vehicle EPS-PMSM

作　　者：陈士安[1] 刘刚[1] 原海波 CHEN Shi’an;LIU Gang;YUAN Haibo(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China;Automotive Engineering Research Institute,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]江苏大学汽车工程研究院,江苏镇江212013

出　　处：《重庆理工大学学报（自然科学）》2023年第6期20-28,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金项目(52072158)。

摘　　要：针对三相逆变器死区时间与导通压降引起汽车电动助力转向永磁同步电机低转速下的谐波电流,提出了对α及β轴电压进行可变阶跃函数补偿的方法。为降低补偿电压摄动,保证谐波电流的抑制效果,通过电流平均法获得准确的三相电流极性。为提高输出波形质量,消除电机低速轻载工况下零电流钳位现象,提出利用可变梯形函数进行α轴及β轴电压补偿。对未补偿、传统平均电压补偿和可变阶跃函数补偿下的EPS-PMSM谐波电流进行数值仿真评估。结果表明:在电机低速轻载工况下,相较传统平均电压补偿法,可变阶跃函数补偿法将电流总谐波失真率再降低约23.42%,并消除了零电流钳位现象。Aiming at the harmonic current of a permanent magnet synchronous motor steered by vehicle electric power at a low speed caused by dead time and on-voltage drop of a three-phase inverter,this paper proposes a variable step function compensation method forαandβaxis voltages.Firstly,in order to obtain a more accurate three-phase current polarity to avoid compensation voltage perturbation,a current averaging method is proposed to replace the first-order low-pass filter.Secondly,in order to improve the quality of the output waveform and eliminate the zero-current clamping caused by inverter dead time of the motor at a low speed and light load,a variable trapezoid function is proposed forαandβaxis voltage compensation.Finally,the harmonic current of a permanent magnet synchronous motor for vehicle electric power steering(EPS-PMSM)is evaluated based on the numerical simulation under three working conditions,including uncompensation,traditional average voltage compensation and variable step function compensation.The results show that,under the condition of a low speed and light load of the motor,compared with the traditional average voltage compensation method,the variable step function compensation method further reduces the total harmonic current distortion by about 23.42%,and eliminates the zero-current clamping.

关 键 词：电动助力转向 永磁同步电机 谐波电流抑制 零电流钳位 可变阶跃函数补偿 

分 类 号：TM341[电气工程—电机]