A Linear Active Disturbance Rejection Controller-Based Sensorless Control Scheme for PMSM Drives

• Main Authors: Qu, Lizhi, Qu, Liyan, Qiao, Wei
• Format: Conference Proceeding
• Language: English
• Subjects: Delays; Field oriented control (FOC); linear active disturbance rejection control (LADRC); linear extended state observer (LESO); Low pass filters; Observers; permanent-magnet synchronous motor (PMSM); rotor position estimation; Rotors; sensorless control; Stators; Voltage control
• ISSN: 2329-3748
• DOI: 10.1109/ECCE.2019.8913312

Sliding-mode observer (SMO)-based rotor position sensorless field-oriented control (FOC) methods have been widely employed for permanent-magnet synchronous motor (PMSM) drives used in electric vehicles. However, these methods have two main problems: phase delay and speed chattering. To cope with these two issues, a linear active disturbance rejection controller (LADRC)-based sensorless FOC scheme is proposed in this paper. The LADRC consists of a linear extended state observer (LESO) and a proportional current controller. The LESO is designed to estimate the back electromotive force (EMF) of the PMSM, which is treated as the external disturbance, without using any low-pass filter or switching function. Then, the rotor position and speed are obtained from the estimated back EMF without any phase delay or speed chattering problem. The estimated disturbance is used as a feedforward compensation term for the input of the plant. The plant combined with the LESO is equivalent to a zero-pole first-order system with a unity gain, which is controlled by a simple proportional current controller to generate the desired voltage vector for the pulse-width modulation (PWM) control of the PMSM inverter. The proposed LADRC-based sensorless FOC scheme is validated by both simulation and experimental results for a 275-W salient-pole PMSM drive in which the PMSM is similar to the traction motor used in Toyota Prius hybrid electric vehicles at a reduced scale.