There exists the harmonics coupling between dq-axis current in the beat envelope of permanent magnet synchronous motor (PMSM) drives with small direct-current link (dc-link) capacitors, which cause the performance reduction of traditional method, which only suppressing current harmonics in single axis, during the flux weakening (FW) region. To solve the beat phenomenon of harmonic coupling, this article proposes an impedance reshaping strategy based on the signal feature extraction of the beat envelope, which can eliminate the coupling of beat amplitude from dq-axis harmonics. On this basis, the beat suppression method with the closed loop of beat amplitude improves the adaptability to the motor speed and torque. The feature signal of the beat amplitude is extracted with the mean values and the harmonics of the motor currents in dq-axes, which is used to reshape the impedance relationship between the beat amplitude and rectifier side. Hence, the beat amplitude in motor current can be directly suppressed under dq-axis current harmonics coupling and operating condition variation. Experimental results show that the strategy can suppress the beat phenomenon of the motor current effectively.

中文翻译：

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基于节拍现象特征提取的无电解电容电机驱动谐波解耦


具有小型直流环节（dc-link）电容器的永磁同步电机（PMSM）驱动器的拍频包络中dq轴电流之间存在谐波耦合，导致传统方法仅抑制电流谐波的性能下降在单轴上，在磁通弱化 (FW) 区域。针对谐波耦合的拍频现象，本文提出了一种基于拍频包络信号特征提取的阻抗整形策略，可以消除dq轴谐波的拍频幅度耦合。在此基础上，采用脉动幅值闭环脉动抑制方法，提高了对电机转速和扭矩的适应性。利用dq轴电机电流的平均值和谐波提取拍幅特征信号，用于重塑拍幅与整流侧之间的阻抗关系。因此，在dq轴电流谐波耦合和运行条件变化的情况下，可以直接抑制电机电流的拍幅。实验结果表明，该策略能够有效抑制电机电流的跳动现象。