一种电动汽车用PMSM速度电流单环控制方法

A SPEED-CURRENT SINGLE-LOOP CONTROL METHOD OF PMSM FOR ELECTRIC VEHICLE

为了提高电动汽车用永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)控制的鲁棒性,提出一种PMSM非级联结构控制策略。基于传统的PMSM数学模型,建立PMSM的二阶速度运动方程。提出一种非奇异终端滑模控制器,实现PMSM的速度和电流的单环控制。设计一种二阶非线性扰动观测器,用于估计PMSM的参数不确定性及负载扰动并前馈补偿给系统。采用Lyapunov理论,对设计的复合控制器进行收敛性证明。将所提方法与传统的级联结构的SMC和PID方法进行仿真对比,验证了该方法具有更快的跟踪速度和更强的扰动抑制能力。

In order to improve the robustness of permanent magnet synchronous motor(PMSM)drive system,a non-cascade control structure is proposed.Based on the traditional PMSM mathematical model,the second-order speed motion equation of PMSM was established.A non-singular terminal sliding mode controller was proposed,which regulated the speed and current in one loop.A second order nonlinear disturbance observer was proposed to estimate the lumped disturbance which consisted of parameters uncertainty and load disturbance.The convergence of the designed controller was proved by using Lyapunov theory.Simulation comparisons were established based on the proposed method,SMC and PID.The results verify that the proposed method has faster speed tracking and stronger disturbance rejection ability.