九相开绕组永磁电机SPWM中的三次谐波抑制

Suppression of Third Harmonic Caused by SPWM for a Nine-phase Open-end Winding Permanent Magnet Synchronous Motor

为抑制九相开绕组永磁同步电机定子绕组中的3次谐波电流,该文提出一种3次谐波电压前馈控制方法。对逆变器非线性因素造成的3次谐波电压由同步坐标系锁相环进行追踪,同时考虑反电势中的3次谐波电压,共同作为前馈量对调制信号进行修正。将电压谐波前馈控制与电流谐波闭环控制相结合,提高了3次谐波电流控制的响应速度和控制精度。最后,通过实验验证了该文提出的3次谐波电流抑制方法的可行性与有效性。

In order to suppress the third harmonic current in stator winding of the nine-phase open-end winding permanent magnet synchronous motor(PMSM),a harmonic voltage feedforward control method is proposed in this paper.The third harmonic voltage caused by non-linear factors of the inverter is tracked by synchronous reference frame phaselocked loop(SRF-PLL),and the third harmonic voltage of the back EMF is also considered,which both are used as feedforward components.With the combination of voltage harmonic feedforward control and current harmonic closedloop control,response speed and control accuracy of the third harmonic current control are improved.Finally,the feasibility and effectiveness of the third harmonic current suppression method proposed in this paper are verified by experiments.