永磁同步电机高阶终端滑模观测器设计

摘要

In order to accurately estimate the rotor position and speed of the Permanent-Magnet Synchronous Motor (PMSM),a high-order terminal sliding mode observer was proposed.First of all,a terminal sliding mode variable was used to guarantee the rapid convergence of the system state.Then,a high-order sliding mode control law was designed to realize precise tracking of the back electromotive-force based on high-order sliding theory,as such,the phase lag in traditional sliding modes caused by low-pass filtering (LPF) can be avoided.Finally,the rotor position and speed information of the PMSM was demodulated based on the software phase-locked loop algorithm.In addition,Lyapunov function was constructed to prove the stability of observer.The simulation results show the designed observer can obtain satisfactory estimation performance.%为实现永磁同步电机转子位置和速度的准确估计,提出一种高阶终端滑模观测器.首先,通过构建终端滑模变量,保证系统状态快速收敛;其次,基于高阶滑模理论设计滑模控制律,实现对反电动势的准确跟踪,避免了低通滤波引起的相位滞后问题;最后,通过软件锁相环算法,解调出永磁同步电机的转子位置和速度信息.通过构造李亚普诺夫函数证明了上述观测器的稳定性.经仿真对比分析,所设计的观测器能够获得满意的观测性能.