基于转速反馈增量补偿的永磁同步电机柔性负载谐振抑制方法

针对电动汽车中永磁同步电机(PMSM)驱动柔性负载产生的振荡现象,提出了一种基于转速反馈的增量补偿式柔性负载谐振抑制方法。首先,通过高通滤波器找出转速中导致系统发生谐振的频率点。然后,将谐振频率点处的转矩增量经过负反馈调节补偿给电磁转矩处进行调整,以增大电磁转矩的垂直分量系数和系统的阻尼系数,在保证系统稳定性的同时达到谐振抑制的效果。在此基础上,引入转速反馈系数提高了系统极点的自由度,进一步提升了系统的控制性能。最后,通过仿真验证了方法的可行性。

A Resonance Suppression Method Based on Speed Feedback Incremental Compensation for Flexible Load Driven by Permanent Magnet Synchronous Motor

To address the resonance issue of flexible loads driven by permanent magnet synchronous motors (PMSMs) in electric vehicles, the resonance suppression scheme based on speed feedback incremental compensation is adopted. Firstly, a high pass filter is utilized to effectively determine the resonance frequency point in the speed response. Then, for increasing the coefficient associated with vertical component in the electromagnetic torque and the damping coefficient in the system, the electromagnetic torque can be reasonably regulated by the negative feedback compensation according to the torque increment at the resonance frequency point. Thus, both the system stability and resonance suppression can be ensured. Following this, a speed feedback coefficient is introduced, which aims to increase the degree of freedom of the poles and even further improve the control performance. Finally, the feasibility of the method is validated by simulation.