基于谐波注入PWM的高速永磁同步电机纹波电流抑制方法

doi:10.11985/2017.09.001

摘要/Abstract

摘要：

在高速永磁同步电机调速系统中,PWM逆变器的低载波比和高速永磁同步电机的小电感使得电机绕组中存在较大的纹波电流。为有效抑制纹波电流,提出一种谐波注入PWM调制方式,即在SPWM正弦信号波中注入3次和9次谐波,通过优化PWM逆变器供电电压脉冲序列宽度,达到减小高速永磁同步电机纹波电流的目的。首先,基于规则采样高速永磁同步电机控制系统,论述谐波注入PWM原理和实现方法;其次,推导纹波电流谐波成分的计算公式,根据纹波电流谐波频谱分布的特点,引入纹波电流谐波群畸变率定量描述纹波电流大小,以弥补纹波电流总畸变率的不足,对谐波注入PWM的纹波电流抑制效果计算分析;最后,对谐波注入PWM方法进行实验验证,实验结果表明,所提谐波注入PWM方法可以有效抑制高速永磁同步电机纹波电流。

关键词: 高速永磁同步电机, 谐波注入PWM, 纹波电流, 谐波计算

Abstract:

In the high speed permanent magnet synchronous motor speed control system, the low carrier wave ratio of the PWM inverter and the small inductance of the high speed permanent magnet synchronous motor make larger the ripple current in the motor windings. In order to effectively reduce the ripple current, a harmonic injection PWM modulation is presented, which is SPWM sinusoidal signal wave injected into the three harmonic and nine harmonic. Power supply voltage pulse of PWM inverter could be optimized by the harmonic injection PWM, and the ripple current would be reduced in the high speed permanent magnet synchronous motor. First of all, harmonic injection principle and realization method are discussed in the high speed permanent magnet synchronous motor control system based on the regular sampling PWM. Secondly, the calculating formula of ripple current harmonic components is deduced. According to the characteristics of ripple current harmonic spectrum, ripple current harmonic group distortion ratio is used for the quantitative description of ripple current, which compensate incomplete features of the ripple current total distortion ratio. The harmonic current suppression effect of harmonic injection PWM is calculated and analyzed. Finally, the harmonic injection PWM method was verified by experiments, and experimental results show that the proposed method can effectively suppress ripple current of the high speed permanent synchronous motor.

Key words: High speed permanent magnet synchronous motors, harmonic injection PWM, ripple current, harmonic calculation

中图分类号:

TM315

于吉坤,李立毅,杜鹏程,张江鹏. 基于谐波注入PWM的高速永磁同步电机纹波电流抑制方法[J]. 电气工程学报, 2017, 12(9): 1-10.

Jikun Yu,Liyi Li,Pengcheng Du,Jiangpeng Zhang. High Speed Permanent Magnet Synchronous Motors Ripple Current Suppression Based on Harmonic Injection PWM[J]. Journal of Electrical Engineering, 2017, 12(9): 1-10.

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