永磁同步电机新型趋近律滑模控制策略

为了提高永磁同步电机(PMSM)调速系统的动态性能,提出一种新型趋近律滑模控制策略。所提出的新型趋近律在幂次趋近律的基础上加入指数项,并且在幂次项指数中引入系统状态变量使幂次项指数与系统状态关联,解决幂次趋近律在远离滑模面时趋近速度慢的问题,同时使系统能平滑进入滑模面。然后,基于扩张状态观测器观测系统负载扰动,并将观测值前馈补偿至滑模控制器,降低负载扰动对系统的影响,提高系统的鲁棒性。仿真与实验结果表明,所提出的新型趋近律滑模控制策略能够有效地提高系统的动态性和鲁棒性。

New reaching law sliding mode control strategy for permanent magnet synchronous motor

In order to improve the dynamic performance of PMSM(Permanent Magnet Synchronous Motor) speed regulation system, a new reaching law sliding mode control strategy is proposed. Based on the power reaching law, an exponential term is added, and the system state variable is introduced into the power term index to associate the power term index with the system state, so as to solve the problem of slow approa-ching speed when the system state is far from the sliding surface, and meanwhile make the system enter the sliding surface smoothly. Then, the extended state observer is applied to observe the load disturbance, and the feedforward compensation of the observation value is employed to the sliding mode controller, which can reduce the impact of load disturbance on the system and improve the system robustness. The simulative and experimental results show that the proposed new reaching law sliding mode control strategy can improve the dynamic performance and robustness of the system effectively.