针对直流母线电压跌落的永磁同步电机弱磁控制策略

Flux-Weakening Control Strategy for Permanent Magnet Synchronous Motor with DC Bus Voltage Drop

针对车用永磁同步电机(PMSM)运行过程中直流母线电压跌落造成电机基速发生变化的问题,提出了一种根据直流母线电压实时调整PMSM直轴电流的弱磁控制方法。当电机母线电压低于给定转速所需要的母线电压,且电压极限椭圆与电流极限圆有交点时,通过判断电流调节器输出的电压综合矢量与实时直流母线电压,来调整电机直轴电流,从而维持恒定转速。根据所提控制方法搭建了基于MATLAB/Simulink的仿真模型,仿真结果验证了所提控制方法能够解决直流母线电压跌落带来的转速突变的问题。最后,在仿真的基础上搭建了试验平台,通过试验验证了该弱磁控制算法的有效性。

To solve the problem of the base speed change of the permanent magnet synchronous motor(PMSM)caused by the DC bus voltage drop during operation,a flux-weakening control method by adjusting the d-axis current of the PMSM based on the DC bus voltage was proposed.When the bus voltage of the motor was lower than the bus voltage required for a given speed as well as the voltage limit ellipse intersected the current limit circle,the d-axis current of the motor was adjusted by judging the voltage vector from the current regulator output value and the real-time DC bus voltage,so as to maintain the constant speed.The simulation model was built on MATLAB/Simulink according to the proposed control method.The simulation results verified that the proposed control method could solve the problem of sudden speed change caused by the DC bus voltage drop.Finally,an experimental platform was constructed to validate the effectiveness of the flux-weakening control method.