Design Method of Active Disturbance Rejection Controller for Asynchronous Motor

Abstract

The invention discloses a design method for an ADRC controller of an asynchronous motor, which comprises the steps of: 1. constructing a dynamic mathematical model of the asynchronous motor in a synchronously rotating orthogonal coordinate system oriented according to the rotor flux linkage; Loop first-order ADR controller, magnetic link ring first-order ADR controller, d-axis current loop first-order ADR controller and q-axis current loop first-order ADR controller four first-order ADR controllers The structure of the asynchronous motor vector control system composed of the controller; 3. Design the speed loop first-order ADRC controller, the flux link loop first-order ADRC controller, and the d-axis of the asynchronous motor vector control system described in step 2 respectively. Current loop first-order active disturbance rejection controller and q-axis current loop first-order active disturbance rejection controller. The method of the invention has simple steps, enhances the ability of the system to resist load disturbance and motor parameter changes, improves the control precision and robustness of the system, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of asynchronous motor control, and in particular relates to a design method of an active disturbance rejection controller of an asynchronous motor. Background technique [0002] Asynchronous motors have the advantages of simple structure, durability, and reliable operation, and are widely used in industrial applications. The introduction of the vector control method realizes the decoupling control of torque and flux linkage, making the frequency conversion speed regulation performance of the asynchronous motor comparable to that of the DC motor control performance. However, in the actual application process, the traditional PI vector control system is greatly affected by load changes and motor parameter changes, so the control performance is greatly affected. Modern control strategies such as sliding mode variable structure control, adaptive control, predictive control, and internal model control have recei...

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Problems solved by technology

[0004] However, in the design process of the current ADRC controller for asynchronous motors, it is not completely designed according to the mathematical characteristics of the ADRC controller. In the controller design, there is a method of simplification through linearization, and the controller is only based on experience. The value of the parameters makes the asynchronous motor frequency conversion speed regulation system unable to achieve the ideal control performance

In addition, for the current i of the asynchronous motor in the synchronous rotating coordinate system d , i q , speed ω r , flux linkage ψ r Different features in the mathematical model do not distinguish the design of the controller, which greatly affects the control performance of the controller

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