基于电流前馈的电动汽车永磁同步电机矢量控制

Vector control of permanent magnet synchronous motor for electric vehicle based on current feedforward

以电动汽车使用的永磁同步电机为研究对象,探讨电机控制系统抗干扰能力提升及汽车行驶舒适性改善问题。提出一种基于电流前馈控制的空间矢量脉宽调制(SVPWM)控制策略,对传统矢量控制中的d-q轴参考电流分量分别进行补偿。通过永磁同步电机控制系统Simulink仿真模型,对电动汽车负载启动及超车加速时电机控制状态进行模拟。在负载启动的情况下,针对永磁同步电机参考转速变化、负载转矩变化等情形,对转速、电磁转矩、三相定子电流、输出磁链等关键性指标进行仿真波形分析。实验结果表明电流前馈SVPWM控制策略能够有效抑制电机转矩脉动,较快速稳定控制电机,所建立模型鲁棒性高,对于提升驾驶人对电动汽车行车满意度有很大帮助。

Taking the permanent magnet synchronous motor used in electric vehicles as the research object,this paper discusses the improvement of anti-interference ability of motor control system and the improvement of vehicle driving comfort.A space vector pulse width modulation(SVPWM)modulation control strategy based on current feedforward control is proposed to compensate the reference current components of d-q axis in traditional vector control.Through the Simulink simulation model of permanent magnet synchronous motor control system,the motor control state of electric vehicle during load starting and overtaking acceleration is simulated.In the case of load starting,according to the reference speed change and load torque change of permanent magnet synchronous motor,the simulation waveforms of key indicators such as speed,electromagnetic torque,three-phase stator current and output flux are analyzed.The experimental results show that the current feed-forward SVPWM control strategy can effectively suppress the motor torque ripple,control the motor more quickly and stably,and the established model has high robustness,which is of great help to improve the driving satisfaction of electric vehicles.