基于非线性扩张观测器的永磁同步电机无位置传感器低速控制策略研究

Research on Sensorless Low Speed Control Strategy of PMSM Based on Nonlinear Extended Observer

针对永磁同步电机在实际应用中需要安装位置传感器以及在低速、无位置控制系统中由于多种非线性变量相互耦合影响电机动态性能的问题,设计了基于脉振高频电压注入法的永磁同步电机无位置低速控制系统。并将非线性扩张观测器引入控制系统中,实现未知不确定和外加干扰的估计,将其应用于闭环PID控制中,实现无需位置传感器的永磁同步电机低速控制。研究结果表明:基于非线性扩张观测器的永磁同步电机低速控制系统可以按照预定速度给定平稳运行,并且具有良好的抗扰动性能,满足实际应用中的控制需求。

In order to solve the problem that the permanent magnet synchronous motor needs to install position sensor in the practical application and the dynamic performance of the motor is affected by the coupling of various nonlinear variables in the low-speed and non position control system,the non position low-speed control system of permanent magnet synchronous motor based on the high frequency voltage injection method of pulse vibration was designed.The nonlinear extended observer was introduced into the control system to realize the estimation of unknown uncertainty and external disturbance.It was applied to the closed-loop PID control to realize the low-speed control of PMSM without position sensor.The results show that the low-speed control system of PMSM Based on the nonlinear extended observer can run smoothly according to the preset speed,and has good anti disturbance performance,which meets the control requirements in practical application.