基于自适应扰动观测器的PMSM无传感器控制

PMSM sensorless control based on adaptive disturbance observer

在基于滑模观测器的永磁同步电机无传感器矢量控制系统中,通过高频率开关信号使系统工作于滑动模态,获得对干扰良好的鲁棒性,但同时会给系统带来抖振等问题。通过改用自适应扰动观测器,避免了系统抖振,同时弱化了传统基于电机模型的无位置传感器控制方法对电机参数的依赖性。并通过数学变换避免微分运算,减少了计算噪声。通过使用锁相环作为电机转子位置/速度跟踪器,提高了永磁同步电机无传感器控制的质量。仿真和实验均有良好的效果,验证了此方法的正确性和可行性。

In a sensorless control system of a permanent magnet synchronous motor based on a sliding mode observer, the system operates in a sliding mode through a high-frequency switching signal, thereby obtaining good robustness to interference, but at the same time, there is a problem of chattering in the system. Because of this, by adopting the adaptive disturbance observer, the system buffeting is avoided, and the dependence of the conventional sensorless control method based on the motor model on the motor parameters is weakened. And through the mathematical transformation to avoid the differential operation, reducing the computational noise. By using a phase-locked loop as the motor rotor position/speed tracker, the sensorless control of the permanent magnet synchronous motor is improved. Both simulation and experiment have good results, verifying the correctness and feasibility of this method.