Sensorless active-disturbance-rejection strategy of permanent magnet synchronous motor for electric vehicle climbing

Abstract

The invention discloses a position-sensorless active-disturbance-rejection strategy of a permanent magnet synchronous motor for climbing of an electric vehicle, and the strategy specifically comprises the steps: firstly, a non-singular sliding-mode observer based on an alpha-beta coordinate system and a phase-locked loop position tracking structure; and constructing a rotating speed loop active-disturbance-rejection controller based on the estimated rotating speed and the given rotating speed n *, obtaining a control quantity u through the active-disturbance-rejection controller, and performing current distribution through a maximum torque current ratio MTPA control algorithm so as to control the motor. Through a phase-locked loop position tracking structure based on a nonsingular sliding mode observer and an active disturbance rejection controller based on a rotating speed loop, the control performance of a position sensorless is improved, the rotating speed estimation precision and the rotor position estimation precision are further improved, and the influence of torque fluctuation is reduced.

Description

technical field [0001] The invention belongs to the technical field of AC motor drive control, and in particular relates to a position sensorless self-disturbance rejection strategy for a permanent magnet synchronous motor used for climbing electric vehicles. Background technique [0002] Electric vehicles play an important role in solving the shortage of energy resources. Permanent magnet synchronous motors are widely used in the field of electric vehicles due to their high power density, high energy efficiency and reliable performance. However, most of the existing electric vehicle traction systems use mechanical position / speed sensors to obtain the position or speed signal of the motor. In the actual operation of electric vehicles, the working conditions are complex and the vibrations are severe, which can easily lead to the failure of mechanical sensors and cause failures in the traction system, resulting in large torque impacts, and in severe cases, damage to key compo...

AI Technical Summary

Problems solved by technology

[0005] In this case, the position sensorless control of the permanent magnet synchronous motor will have a large torque fluctuation, which makes the estimated initial rotor position not accurate enough, which will cause the motor to fail to start under the high torque output, and affect the driving performance of the electric vehicle

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