Improved second-order linear active disturbance rejection permanent magnet synchronous motor control method

Abstract

The invention discloses an improved second-order linear active disturbance rejection permanent magnet synchronous motor control method. The method specifically comprises the following steps: 1) establishing a mathematical model of a permanent magnet synchronous motor under an ABC natural coordinate system; 2) giving a basic formula of coordinate transformation of the permanent magnet synchronous motor; 3) deriving a motor mathematical model under a d-q axis coordinate system; 4) designing a second-order linear active-disturbance-rejection controller of a rotating speed loop and a current loop; 5) designing a first-order linear active disturbance rejection controller of a d-axis current loop; 6) designing an improved second-order linear active-disturbance-rejection controller by adopting a model compensation method on the basis of the traditional second-order linear active-disturbance-rejection controller; 7) performing a comparison simulation experiment on the PMSM under the improved second-order linear active disturbance rejection control and the PMSM under the traditional PID control in MatLab / Simulink, wherein the result proves the correctness and feasibility of the algorithm. According to the embodiment of the invention, in the practical process, the setting number of controller parameters is reduced, the precision of the observer is improved, the robustness of the system is enhanced, and the control performance of the whole permanent magnet synchronous motor speed regulation system is improved.

Description

technical field [0001] The invention relates to the field of servo control of permanent magnet synchronous motors, in particular to a method for controlling permanent magnet synchronous motors with improved second-order linear self-disturbance rejection. Background technique [0002] In recent years, permanent magnet synchronous motors have been widely used in the field of industrial servo transmission due to their advantages of high power density, high reliability, small size, simple structure, and easy maintenance; high-performance servo systems require high position resolution, positioning High precision, wide speed range, low-speed stable operation, no creeping phenomenon, small torque ripple, etc., so it poses a greater challenge to the control system of the permanent magnet synchronous motor; however, the permanent magnet synchronous motor itself is a multi- Variable, strong coupling, nonlinear and variable parameter complex control objects, in order to meet the above ...

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Problems solved by technology

However, since PI control is "based on error feedback to eliminate errors", it can suppress constant disturbances or slow-changing disturbances to a certain extent; however, it is necessary for the entire system to achieve accurate, fast, and non-overshooting dynamics for sudden loads and disturbance changes. Response, the traditional PI controller is difficult to meet the control requirements

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