Active-disturbance-rejection control method for permanent magnet synchronous motor of electric vehicle

Abstract

The invention discloses an active-disturbance-rejection control method for a permanent magnet synchronous driving motor of an electric vehicle. Double closed-loop control of a rotating speed loop and a current loop is adopted, a traditional PI control strategy is adopted for a motor current loop control strategy, and an active-disturbance-rejection control (ADRC) strategy is adopted for the rotating speed loop, so that the purpose of improving the control performance of the permanent magnet synchronous motor is achieved; in order to solve the problems that control signals buffet and the control performance is poor due to the fact that a non-linear function in a traditional ADRC control strategy is a piecewise function and piecewise points are discontinuous, a continuous function, a quadratic continuous polynomial and the non-linear function are combined, and a novel continuous and smooth non-linear function L fal(.) is designed for an ADRC controller; according to the improved control method, the response speed and accuracy of the system are effectively improved, the instability of the system is reduced, the robustness to uncertain disturbance is high, the performance of the speed regulation system is greatly improved, and the motor has better dynamic and static performance.

Description

technical field [0001] The invention relates to a motor control strategy, in particular to a permanent magnet synchronous motor control strategy. Background technique [0002] Patent No.: CN201620692008.3, utility model name: "Permanent Magnet Linear Motor Control System Based on Improved ADRC Active Disturbance Rejection Algorithm", which discloses a permanent magnet linear motor control system based on improved ADRC Active Disturbance Rejection Algorithm. The control system adopts double closed-loop control, that is, outer loop speed control and inner loop current control. The system includes ADRC speed controller, d-axis ADRC current controller, q-axis ADRC current control, PWM generation module, driver module, permanent magnet synchronous linear motor, encoding signal, decoding circuit, DSP hardware module QEP, voltage sensor, signal Conditioning circuit and DSP hardware module ADC. The utility model has obvious effects in speed regulation control and anti-parameter pe...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to design a method for self-disturbance rejection control of permanent magnet synchronous motor of electric vehicles, which adopts double closed-loop control of speed loop and current loop, wherein the motor current loop control strategy adopts traditional PI controller, and the speed loop adopts first-order Anti-disturbance controller (ADRC) device, in order to achieve the purpose of improving the control performance of permanent magnet synchronous motor, wherein, in order to improve the nonlinear function fal(·) in the traditional ADRC control strategy is a piecewise function and the discontinuity at the piecewise point leads to control Signal chattering and poor control performance, the continuous function and quadratic continuous polynomial are applied to the nonlinear function fal(·), and a new type of continuous smooth nonlinear function Lfal(·) is designed to carry out ADRC control strategy Improvement, the improved control method effectively improves the response speed and accuracy of the system, reduces the instability of the system, has strong robustness to uncertain disturbances, greatly improves the performance of the speed control system, and makes the motor Has better dynamic and static performance

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