谐波注入法降低永磁同步电机的转矩脉动

Reduction of Torque Ripple in Permanent Magnet Synchronous Motor by Harmonic Injection Method

为了抑制永磁同步电机的转矩脉动,提高电机运行的稳定性,基于多种软件联合仿真的方法,提出了多同步旋转坐标系的主动谐波注入法来提高永磁同步电机运行的稳定性的方案。首先,建立了永磁同步电机的谐波数学模型,对各阶次谐波下的谐波状态方程进行完善;其次,基于现代控制理论的相关理论,通过采用PI控制器来追踪高次谐波的电流反馈环的方法,提取与注入了高次谐波;最后,采用多个软件联合仿真的方法,对永磁同步电机在整个控制系统的性能进行了分析。分析结果表明,通过反馈与前馈高次谐波注入,使得电机的转矩脉动从12.8%降低到了3.3%,从而说明所提出的方案达到了抑制永磁同步电机的转矩脉动的目的。

For reaching the goals which by suppression the torque pulsation of permanent magnet synchronous motor to improve the stability of the motor operation.Based on the method of multi-software co-simulation,an active harmonic injection method of multi-synchronous rotating coordinate system is proposed to improve the stability of permanent magnet synchronous motor.Firstly,the harmonic mathematical model of permanent magnet synchronous motor is established,and the harmonic state equation of each order harmonic is perfected.Secondly,based on the related theory of modern control theory,the higher harmonic is extracted and injected by using PI controller to track the current feedback loop of the higher harmonic.Finally,the performance of permanent magnet synchronous motor in the whole control system is investigated by using multiple software co-simulation method.The analysis results show that the torque ripple of the PMSM is reduced from 12.8%to 3.3%by feedback and feedforward high order harmonic injection,which shows that the scheme proposed in this paper can achieve the purpose of suppressing the torque ripple of the PMSM.