基于有限电压矢量集优化的永磁同步电动机模型预测瞬时转矩控制  

Model Predictive Instantaneous Torque Control of Permanent Magnet Synchronous Motor Based on Finite Voltage Vector Set Optimization

作　　者：郑伟杰 周扬忠 ZHENG Weijie;ZHOU Yangzhong(Fujian Key Laboratory of New Energy Generation and Power Conversion(Fuzhou University),Fuzhou 350116,China)

机构地区：[1]福建省新能源发电与电能变换重点实验室(福州大学),福州350116

出　　处：《电源学报》2025年第2期213-223,共11页Journal of Power Supply

摘　　要：针对T型三电平逆变器驱动的永磁同步电动机驱动系统存在的电容中点电压不易平衡、共模电压较高问题,提出1种有限电压矢量集优化的模型预测瞬时转矩控制MPITC(model predictive instantaneous torque control)策略。首先,鉴于电压矢量对中点电压的影响,仅选用零矢量、小矢量和大矢量参与MPITC。其次,基于开关状态与共模电压的关系,确定13个低共模电压矢量参与控制。再次,为提高电机运行性能,利用长矢量合成虚拟电压矢量替代中矢量参与模型预测控制。最后,根据中点电位和电机电流方向,从19个电压矢量中选出对维持中点电压平衡有利的电压矢量作为预选矢量集。实验结果证明了所提控制策略能够有效降低电磁转矩和磁链脉动及共模电压幅值,同时能够实现中点电压的平衡控制。Aimed at the problems of unbalanced capacitor neutral-point voltage and high common-mode voltage in a permanent magnet synchronous motor drive system powered by a T-type three-level inverter,a model predictive instantaneous torque control(MPITC)strategy based on finite voltage vector set optimization is proposed.First,in view of the influence of voltage vectors on the neutral-point voltage,only zero,small and large vectors are selected to participate in MPITC.Second,according to the relationship between the switching states and common-mode voltage,it is confirmed that 13 low common-mode voltage vectors participate in the control.To improve the operation performance of the motor,the long vector synthetic virtual voltage vector is used to replace the medium vector to participate in the model predictive control.Finally,according to the neutral-point potential and the motor current direction,the voltage vector which is favorable for maintaining the neutral-point voltage balance is selected from 19 voltage vectors as the preselected vector set.Experimental results show that the proposed control strategy can effectively reduce the electromagnetic torque,flux linkage pulsation and common-mode voltage amplitude,and the neutral-point voltage achieves balanced control.

关 键 词：T型三电平逆变器 模型预测瞬时转矩控制 中点电压平衡 共模电压 

分 类 号：TM341[电气工程—电机]