混合动力汽车永磁同步电机的电流滑模控制与负载扰动补偿

Current Sliding Mode Control and Load Disturbance Compensation of PMSM for Hybrid Electric Vehicles

针对在永磁同步电机矢量控制系统中应用电流滑模控制策略时,因滑模切换增益增大而加剧系统抖振的问题,提出一种带有负载扰动滑模观测器的电流滑模控制方法。该方法选取关于转速观测误差的积分滑模面,根据负载扰动观测误差自适应地调整切换增益,并将负载扰动观测值前馈补偿至电流滑模控制器输出端,从而使切换增益减小且可收敛于零。仿真与实验结果表明,所提出方法在保证系统鲁棒性的同时,削弱了系统抖振,改善了负载扰动时电流跟踪响应特性,因此适用于混合动力汽车电机驱动的场合。

In view of the problem of the aggravation of system chattering caused by the increase in switching gain of sliding mode when applying current sliding mode control strategy to the vector control system of permanent magnet synchronous motor（PMSM）,a current sliding mode control scheme with a sliding mode observer for load disturbance compensation is proposed.In this scheme,the integral sliding mode surface with respect to the speed observation error is selected,the value of switching gain is adaptively adjusted according to the observation error of load disturbance,and the observed value of load disturbance is feedforward to the output of current sliding mode controller for compensation,leading to the reduction in switching gain,which can converge to zero.Simulation and experimental results show that the proposed scheme weakens system chattering and improves current tracking responses under load disturbance,while assuring the system robustness,so suitable for being applied to HEV motor drive.