永磁同步电机速度-电流预测的直接速度控制

PMSM speed-current prediction direct speed control

高精度的永磁同步电机对调速系统的动态性能以及速度的稳定性都有极高的要求。针对传统电机控制方式动态性能较差,受不确定负载干扰大等问题,采用模型预测的方法设计速度-电流非级联直接速度控制器,取代了传统的比例-积分(PI)调节器,消除了双环级联结构。预测模型对速度进行长距离预测,利用约束力更强的代价函数优化控制系统动静态性能。最后,通过Simulink仿真实验表明,与传统PI矢量控制相比转速超调降为0,突加负载时速度最大跌落量下降了45 r/min,恢复时间加快了0.055 s,同时对转速和电流的波动抑制效果显著,系统动态性能和抗干扰能力更优。

High-precision permanent magnet synchronous motors have extremely high requirements on the dynamic performance and speed stability of the speed control system.Aiming at the problems of poor dynamic performance of traditional motor control methods and large interference from uncertain loads,a speed-current non-cascaded direct speed controller was designed using the method of model prediction,which replaced the traditional proportional-integral(PI)regulator.Eliminate the double-ring cascade structure.The prediction model performs long-distance prediction on the speed,and uses a more restrictive cost function to optimize the dynamic and static performance of the control system.Finally,the simulation experiment shows that compared with the traditional PI vector control,the speed overshoot is reduced to zero,the maximum speed drop is reduced by 45 r/min when the load is suddenly applied,and the recovery time is accelerated by 0.055 s,at the same time,the effect of suppressing the fluctuation of speed and current is significant,and the system dynamic performance and anti-interference ability are better.