A Compound Control Method for First-Order Inertia Pure Lag Processes

A technology of composite control and control method, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as control instability and mismatch, and achieve the effect of improving robustness

Active Publication Date: 2021-11-05
TSINGHUA UNIV
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Problems solved by technology

When the model characteristics of the controlled process change, the model used in MPC design does not match the actual object, which will lead to unstable control in severe cases

Method used

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  • A Compound Control Method for First-Order Inertia Pure Lag Processes
  • A Compound Control Method for First-Order Inertia Pure Lag Processes
  • A Compound Control Method for First-Order Inertia Pure Lag Processes

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Embodiment Construction

[0020] The specific embodiment of the present invention and working process will be further described below in conjunction with accompanying drawing.

[0021] The first-order inertial pure hysteresis process is a single-input and single-output link. The relationship between the controlled variable (output) Y(s) and the adjusted variable (input) U(s) can be expressed as:

[0022]

[0023] Among them, K represents the gain coefficient, T represents the time constant, and τ represents the delay time. The goal of the controller design is to make the controlled quantity of this link track the change of the set value. However, due to the perturbation in the real environment, the change of model parameters caused by the change of operating conditions, and the constraints brought by physical limitations, the performance of the controller cannot meet expectations.

[0024] The purpose of the present invention is to propose a model predictive control-ADRC composite control method fo...

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Abstract

The invention discloses a compound control method for a first-order inertial pure hysteresis process, and relates to a model predictive control-active disturbance rejection control compound control method for the first-order inertial pure hysteresis process. In this method, the ADRC controller is firstly designed based on the first-order inertial pure lag process, so that its closed-loop characteristics are close to the expected dynamic equation, and then the model predictive controller is designed according to the expected dynamic equation. The output of the model predictive controller is the output of the ADRC controller. Set value (input value). On the one hand, the present invention can optimize the setting value of the ADRC, and on the other hand, because the ADRC can better overcome the influence of uncertainty brought by internal and external disturbances, the closed-loop response of the controlled process is always close to the expected dynamic equation, Therefore, it is ensured that the performance of the MPC based on the expected dynamic equation as the prediction model will not be severely deteriorated, and its robustness is improved.

Description

technical field [0001] The invention relates to a control method for a First Order Plus Time Delay (FOPTD) process, which belongs to the field of process automatic control. Background technique [0002] The first-order inertial pure hysteresis model can characterize a class of dynamic characteristics common in the field of process control. When the controlled process is affected by unmeasurable external disturbances, or the model characteristics change with the change of working conditions, the performance of the controller will often decline. . [0003] Active disturbance rejection control (Active Disturbance Rejection Control, ADRC) can take the influence of the above-mentioned controlled process as the "total disturbance" through the Extended State Observer (Extended State Observer, ESO) estimate, and eliminate the "total disturbance" through the design of the control rate. "Adverse effects. The disadvantage of the ADRC method is that its setting value is difficult to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李东海张帆薛亚丽
Owner TSINGHUA UNIV
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