双Y移30°六相永磁同步电机谐波电流抑制技术

Techniques to Restrain Harmonics of Six-Phase Permanent Magnet Synchronous Motor with Two Y-Connected Windings Displaced by 30°

为了解决双Y移30°六相永磁同步电机定子谐波电流显著问题,结合同步旋转坐标变换理论与准比例谐振(PR)调节器提出了一种谐波抑制方法。采用矢量空间解耦的方法建立双Y移30°六相永磁同步电机的数学模型,分析谐波电流原因,提出一种新的同步旋转坐标变换矩阵,将z1-z2子平面上的5、7次谐波电流转化为6次交流分量,通过6倍基波频率的准PR调节器同时对5、7次谐波电流进行抑制。理论分析和仿真结果表明:采用坐标变换与准PR控制器相结合的谐波抑制方法能有效降低电流谐波含量,提高电机控制性能。

To reduce the undesired stator harmonic current in the six-phase permanent magnet synchronous motor with two Y-connected windings displaced by 30°, an improved vector control method was proposed based on synchronous rotating coordinate transformation and the proportional resonant （PR） controller.Based on the method of space vector decoupling, mathematical models were established for the six-phase permanent magnet synchronous motors with two Y-connected windings displaced by 30°, the adverse impact caused by harmonics was analyzed. Through rotating coordinate transformation, the fifth and seventh harmonic currents were converted to the sixth harmonic current in z1 -z2 plane.PR controllers were introduced to reduce 6 order stator harmonic current. Simulations with a suspension PMSM were carried out. The results verified that the method based on synchronous rotating coordinate transformation and the proportional resonant （PR） controller could suppress the harmonic currents and improve its performance.