基于母线电压动态变化的电动汽车永磁同步电机控制策略

Permanent Magnet Synchronous Motor Control Strategy for EV Considering DC-Bus Voltage Variation

针对车用永磁同步牵引电机的应用需求,提出一种基于母线电压变化实时调整的定子电流优化控制方法。电动汽车运行中由于电池的充放电过程引起直流母线电压变化,造成电机的基速和转折速度变化,导致电流调节器失控与电机系统电压利用率低。因此,基于母线电压变化的控制策略,提出依据母线电压等效折合,同比调整电角速度的方法,直接对控制指令进行实时调整,有效防止调节器饱和,提高电压利用率和电机效率。仿真和试验结果证明了该方法的有效性。

An optimal stator current control method was presented for the permanent magnet synchronous motor （PMSM）in electric vehicle application which could adjust the control value in real time according to the DC-link voltage variation. Since the battery of the electric vehicle had the process of the charging and discharging during the operation, the DC-link voltage of the inverter would be variable in real time. As a result, it would change the base speed, turning speed and lead to the saturation of the current controller and the reduction of the voltage utilization. Thus, based on the control strategy considering the DC-Link voltage variation, a new method was proposed with the adjustment of the electric angel velocity in the same proportion according to the equivalent of the DC-Link voltage. It could prevent the saturation of the current controller effectively while improve the dc-link voltage utilization and the motor efficiency. Simulation and experiment results revealed the effectiveness of the proposed method.