基于动态增益调节器的PMSM弱磁控制

Dynamic Gain Regulator Based PMSM Field-Weakening Control

摘要: 在永磁同步电机(PMSM)弱磁控制中，通常利用参考电压和PI控制器来产生磁通分量电流进而抵消永磁体的磁通量来达到提速效果。然而这种弱磁算法较为复杂，且存在参数调整困难、转矩波动较大的问题。本文提出了一种基于转速变化的动态增益调节器(DGR)弱磁控制方案。该方案通过判断电机当前转速变化快慢和系统最大电流来调节弱磁电流d-q轴分量，以降低系统参数复杂度，通过减小电机实际速度与目标加速度之间的差值，来减小电机速度的超调量，并使电机的速度误差最小化。最后在MATLAB/SIMULINK平台进行仿真，结果表明该方法可有效降低弱磁过程中电机转速、转矩和电流波动，改善系统动态性能，进而实现更加稳定高效的电机控制。

Abstract: In permanent magnet synchronous motor (PMSM) flux weakening control, the reference voltage and PI controller are usually used to generate the flux component current to offset the flux of the permanent magnet to achieve the speed up effect. However, this flux weakening algorithm is more complicated and has the problems of difficult parameter adjustment and large torque fluctuation. In this paper, a dynamic gain regulator (DGR) flux weakening control scheme based on speed change is proposed. The scheme regulates the d-q axis component of the flux weakening current by judging the current speed change speed of the motor and the maximum current of the system to reduce the complexity of the system parameters, reduces the overshoot of the motor speed by reducing the difference between the actual motor speed and the target acceleration, and minimizes the speed error of the motor. Finally, the simulation is carried out in MATLAB/SIMULINK platform, and the results show that the method can effectively reduce the motor speed, torque and current fluctuations during the flux weakening process, improve the dynamic performance of the system, and then realize more stable and efficient motor control.