基于占空比优化的永磁同步电机双矢量FCS-MPC

Two-Vector FCS-MPC for Permanent Magnet Synchronous Motors Based on Duty Cycle Ratio Optimization

在永磁交流伺服系统中,一般采用电流、转速和位置三环级联控制结构。作为最内部的电流环,其动态和稳态性能直接影响系统的整体性能。与传统的PI控制相比,有限集模型预测控制具有动态响应快的优点,但传统的有限集模型预测控制存在电流纹波较大的问题。为解决该问题,提出一种基于占空比优化的双矢量FCS-MPC,选择最优的矢量组合并分别计算各矢量的作用时间,从而获得更精确的电压矢量。仿真结果表明,和传统的有限集模型预测控制相比,该控制算法能够显著降低电流纹波。

The servo system of a permanent-magnet synchronous motor usually consists of current,speed and position loops.Compared with conventional PI control,finite control set-model predictive control(FCS-MPC)has the advantage of fast response.But conventional FCS-MPC has big current ripple.This paper proposes an improved FCS-MPC with the duty cycle optimization in synchronous rotating reference frame.In order to get more precise voltage vector,the most optimal vector combination is chosen and each action time is computed.The simulation results show the effectiveness of the algorithm.