scholarly journals Tuning Rules for Active Disturbance Rejection Controllers via Multiobjective Optimization—A Guide for Parameters Computation Based on Robustness

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 517
Author(s):  
Blanca Viviana Martínez ◽  
Javier Sanchis ◽  
Sergio García-Nieto ◽  
Miguel Martínez
Keyword(s):  
Multiobjective Optimization ◽  
Disturbance Rejection ◽  
Optimization Design ◽  
Order System ◽  
First Order ◽  
Active Disturbance Rejection ◽  
Disturbance Response ◽  
Tuning Methods ◽  
Different Levels ◽  
Tuning Rules

A set of tuning rules for Linear Active Disturbance Rejection Controller (LADRC) with three different levels of compromise between disturbance rejection and robustness is presented. The tuning rules are the result of a Multiobjective Optimization Design (MOOD) procedure followed by curve fitting and are intended as a tool for designers who seek to implement LADRC by considering the load disturbance response of processes whose behavior is approximated by a general first-order system with delay. The validation of the proposed tuning rules is done through illustrative examples and the control of a nonlinear thermal process. Compared to classical PID (Proportional-Integral-Derivative) and other LADRC tuning methods, the derived functions offer an improvement in either disturbance rejection, robustness or both design objectives.

Lower-Order Active Disturbance Rejection Control and Frequency Analysis of High Order System

2017 ◽  
Author(s):  
Ruiqing Zhang ◽  
Shubo Zhang ◽  
Yali Xue ◽  
Yu Hu ◽  
Wendi Wang
Keyword(s):  
Transfer Function ◽  
Frequency Analysis ◽  
Lower Order ◽  
Disturbance Rejection ◽  
High Order ◽  
Order System ◽  
Active Disturbance Rejection Control ◽  
High Order System ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

Linear active disturbance rejection control (LADRC) has been paid much attention in academic and industrial fields. However, the selection of the order for LADRC controller design and the choice of parameter b0 in system correcting are key facts which are still being faced by designer. In this paper, an effective method about how to select the order of LADRC and the parameter b0 is given first. Frequency analysis often used by engineers for designing controller, the normal transfer function form of LADRC is constructed, so the loop gain, close loop transfer function and disturbance transfer function to a general high-order system are presented and can be easily used. The example shows that the proposed method is easy to apply and verified the lower-order LADRC can obtain the better effective than PID and high-order LADRC, and the frequency response analysis of a thermal power plant is elaborated and the simulation result indicates that LADRC has a strong robustness against the large variation of parameters in the plant mode.

Smooth Switching Design/Implementation of the Active Disturbance Rejection Control

2017 ◽  
Author(s):  
Shen Zhao ◽  
Dan Morris ◽  
Zhiqiang Gao
Keyword(s):  
Disturbance Rejection ◽  
Order System ◽  
Control Algorithms ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Advanced Control ◽  
Aerial Vehicle ◽  
Smooth Switching ◽  
System With Time Delay

Although active disturbance rejection control (ADRC) has demonstrated promising results in many applications, in some safety critical applications e.g. power plant, unmanned aerial vehicle, etc., it is often reluctant to switch from an existing control algorithm, either the traditional PID controller or other advanced control algorithms, to a new one. If the switching between the control algorithms can be made seamless, many more opportunities may open up. In this paper, the problem of making the switching to the ADRC smooth is studied. Previous attempts to solve the problem are not thorough enough, since only a second order system was addressed. A very simple and effective method is proposed based on analysis to make the transition seamless. The solution is very general, and can be applied to system of any order or even system with time-delay. At the core of the solution is the initialization of the “total disturbance”.

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