电动汽车永磁同步电机电流谐波抑制研究

针对永磁同步电机相电流畸变引起转矩输出脉动引发整车运行不平稳的问题,提出谐波电压注入方法,建立高次旋转坐标系下隐极、凸极式永磁同步电机均适用的电压模型,基于变频低通滤波提取5、7次谐波电流,将5、7次谐波电压作为前馈控制并联电流环,以高次旋转坐标系d、q轴电流等于0为控制目标,以提高系统灵敏度,增强谐波抑制效果,最后将谐波电压注入控制系统。仿真和试验结果表明,该算法可大幅度减少谐波含量。

Research on Current Harmonic Suppression of Permanent Magnet Synchronous Motor in Electric Vehicles

For the problem of the torque output ripple caused by the phase current distortion of the permanent magnet synchronous motor and the running stability of the electric vehicle, a harmonic voltage injection method is proposed. The voltage model applicable to the non-salient pole and salient pole permanent magnet synchronous motor in the high- order rotating coordinate system are established. The variable frequency low-pass filtering method is used to extract the fifth and seventh harmonics current. The fifth and seventh harmonic voltage are used as feedforward control. On this basis, the fifth and seventh harmonic current loop control is connected in parallel and the d-q axis current is equal to 0 as the control target in the high-order rotating coordinate system. This method is beneficial to improve the sensitivity of the system and enhance the suppression effect on the harmonic current. Finally, the obtained harmonic voltage is injected into the motor control system. The simulation and experimental results show that the high harmonic content is greatly reduced.