基于谐波抑制的共母线开绕组永磁同步电机减振控制

Vibration Control of Open-Winding Permanent Magnet Synchronous Motor with Common Bus Based on Harmonic Suppression

为了减少共母线开绕组永磁同步电机(OW-PMSM)驱动系统中的电流谐波,抑制由径向电磁力引发的电机振动,提出了一种基于零序电流闭环的零矢量重分配随机开关频率空间矢量脉宽调制(SVPWM)算法。该算法通过选取的零矢量产生共模电压,抵消由非零电压矢量带来的共模电压,将零序电流闭环后动态抑制零序电流,有效地减少了相电流3次谐波含量。同时,针对调制策略固有的相电流高频谐波分量,通过SVPWM中开关频率随机化,使得开关频率及其整数倍处高频谐波幅值大大减少。试验结果表明,该方法能有效降低高低频段电流谐波幅值,实现OW-PMSM全频段的减振控制。

The current harmonics occur in the common DC bus open-winding permanent magnet synchronous motor(OW-PMSM)and the vibration of the motor is caused by the radial electromagnetic force.In order to solve these problems,a zero vector redistribution random switching frequency space vector pulse width modulation(SVPWM)algorithm based on zero-sequence current closed loop is proposed.The algorithm offsets the common mode voltage generated by the zero vector against that caused by the non-zero voltage vector,and dynamically suppresses the zero-sequence current after the closed loop to reduce the third-order harmonic content of the phase current.At the same time,for the inherent high-frequency harmonic components of the phase current of the modulation strategy,randomization of the switching frequency in SVPWM can greatly reduce the high frequency harmonic amplitude at the switching frequency and its integer multiples.Experimental results show that the algorithm can effectively reduce the current harmonics of high and low frequency bands,and achieve vibration control of the OW-PMSM.