基于改进ADRC的PMSM无位置传感器转速控制

摘要:

永磁同步电机(PMSM)是一个非线性、多变量、强耦合系统，具有不确定的外部干扰。为了提高对其转速控制精度，采用改进自抗扰控制代替传统自抗扰控制(ADRC)。通过插值法构建一个新的函数来代替ADRC中原有的最优控制函数，并用线性误差反馈控制率代替非线性误差反馈控制率(NLSEF)以此来降低调参难度。同时建立基于脉振高频注入法和滑模观测器法的位置辨识系统，以满足PMSM转子位置的辨识精度要求。仿真结果表明，改进ADRC能够在无位置传感器控制方法中取得较好的控制效果，转子位置估计的误差小于0.002rad，转速估计误差小于0.02rad/min，转速超调量小于4%，最大振荡不超过60rad/min，与传统ADRC控制器相比系统抗扰动性更强，电机位置和速度辨识效果也更优。 关键词：自抗扰控制；无位置传感器；永磁同步电机

Abstract:

Permanent magnet synchronous motor is a nonlinear, multivariable, strong coupling system with uncertain external interference. In order to improve the accuracy of its speed control, the improved ADRC is used instead of the traditional ADRC. A new function is constructed by interpolation to replace the original optimal control function in ADRC, and the linear error feedback control rate is used to replace the nonlinear error feedback control rate, so as to reduce the difficulty of parameter adjustment. a position identification system based on pulse high frequency injection method and sliding mode observer method is established to meet the accuracy requirements of PMSM rotor position identification. The simulation results show that the improved ADRC can achieve better control effect in the positon sensorless control method. The error of rotor position estimation is less than 0.002rad, the error of speed estimation is less than 0.02rad/min, the speed overshoot is less than 4%, and the maximum oscillation is not more than 60rad/min. Compared with the traditional ADRC controller, the system has stronger anti disturbance performance, and the identification effect of motor position and speed is also better.