基于改进的滑模控制器和观测器的SPMSM控制

SPMSM Control Based on Improved Sliding Mode Controller and Observer

针对永磁同步电机(PMSM)滑模控制系统具有的系统抖振和相位延迟等问题,提出在速度环设计全局快速终端滑模控制器(GFTSMC)。其中,滑模面结合了线性滑动模态和快速终端模态,并且设计了不含有切换项的连续控制律,能够在一定程度上削弱抖振,提高系统鲁棒性,通过Lyapunov函数证明了其稳定性。采用模糊滑模观测器实现了PMSM无位置传感器控制,利用双曲正切函数替换符号函数进行滑模观测,通过模糊控制规则自适应调节滑模增益大小,省掉低通滤波器,简化了系统,可削弱抖振,提高系统稳定性及跟踪准确性。通过MATLAB仿真验证了所提方法的可行性。

Aiming at the problems of chattering and phase delay in the sliding mode control system of permanent magnet synchronous motor(PMSM), a global fast terminal sliding mode controller(GFTSMC)based on the speed loop is proposed. The sliding mode surface combines the linear sliding mode and the fast terminal mode. A continuous control law without switching term is designed, which can reduce chattering to a certain extent and improve system robustness. The stability of the system is proved by the Lyapunov function.The fuzzy sliding mode observer is used to realize the position sensorless control of PMSM, in which the hyperbolic tangent function is used to replace the sign function for sliding mode observation. The sliding mode gain is adaptively adjusted by fuzzy control rules. The low-pass filter is eliminated. The system can be simplified and chattering can be weakened. The stability and tracking accuracy of the system can be improved.The feasibility of the proposed method is verified by MATLAB simulation.