针对永磁同步电机无位置传感器控制系统,设计了一种带自抗扰功能的基于扩展状态观测器(Extended State Observer,ESO)的转子位置与转速观测器.利用自抗扰技术中ESO能精确估计扰动的能力,将包含转子位置和转速的反电动势项视为扰动,将电压电流信号分别作为ESO的状态和输入,从而估计出反电动势,并在传统PI-QPLL的基础上设计了ESO-QPLL,将负载转矩变化和其他未建模动态视作扰动,提高了PLL的抗负载扰动性能.
Extended State Observer-based Position-sensorless Control of PMSM
A rotor position and speed observer based on extended state observer (ESO)with self-immunity has been de-signed in this work for a permanent magnet synchronous motor (PMSM)in a position-sensorless control system.By utili-zing the ability of ESO to accurately estimate perturbation,and regarding the reverse potential term containing rotor posi-tion and rotational speed as a perturbation,as well as voltage and current signals as state and input of the ESO,respec-tively,the reverse potential was estimated.Based on the conventional PI-QPLL,the ESO-QPLL was designed,which im-proves the load disturbance resistance of the PLL by treating load torque variations and other unmodeled dynamics as per-turbations.
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