积分型非奇异终端滑模PMSM无传感器控制系统

Integral non-singular terminal sliding mode PMSM sensorlesscontrol system

针对永磁同步电机中高速情况下传统的滑模观测器估算精度低且存在较强抖振的问题,提出一种基于改进型滑模观测器的PMSM矢量控制方法。基于非线性滑模面理论分析,构建一种积分型非奇异终端滑模面,有效降低了抖振现象,提高了系统的观测精确度;并设计了一种自适应反电动势滤波器,使反电动势能随观测器自适应调节,且谐波含量低,进一步提升动态精度;最后,利用正交锁相环原理调制出电机转子位置信息,将提出的新型控制方法应用到永磁同步电机调速系统,与传统滑模控制进行对比。仿真和实验表明,提出的基于新型滑模观测器的永磁同步电机控制系统跟踪精度高、鲁棒性强,动、静态响应好。

In order to solve the problem of low estimation accuracy and strong chattering of the traditional sliding mode observer at medium and high speeds of permanent magnet synchronous motors,a vector control method of PMSM based on an improved sliding mode observer was proposed.Based on the theoretical analysis of the nonlinear sliding mode surface,in the method an integral non-singular terminal sliding mode surface was constructed,which effectively reduces chattering phenomenon and improves the observation accuracy of the system.An adaptive back electromotive force filter was designed to make the back electromotive force adjust adaptively with the observer,and its harmonic content is low,which further improves the dynamic accuracy.Finally,the rotor position information of the motor was modulated using the principle of quadrature phase-locked loop,and the proposed novel control method was applied to the speed control system of the permanent magnet synchronous motor to compare it with the traditional sliding mode control.Simulations and experiments show that the proposed permanent magnet synchronous motor control system based on a new sliding mode observer has high tracking accuracy,strong robustness,fast convergence speed and good dynamic and static responses.