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<p>In this paper, we propose a quantitative parameter tuning rule of second-order linear active disturbance rejection controller (LADRC) for high-order plus delay time (HOPDT) processes based on analysis of frequency domain. Especially, we focus on the study of the open-loop frequency transfer function because the open-loop transfer function based on second-order LADRC in general HOPDT processes has integral characteristic. A novelty of the paper is to derive the equation of the vertical asymptote in the Nyquist plot and to propose a quantitative parameter tuning rule for a second-order LADRC through a detailed analysis. The results of simulation and comparison demonstrated the superiority of the proposed tuning rule. The practical validation of the flocculant dosing control of water treatment process has fully shown the promising potential that the proposed parameter tuning rule is more applicable to process control practices.</p>

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A method of LADRC design for HOPDT processes based on frequency domain analysis and its application in flocculant dosing control

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Song-Mu Kim,
  • Su-Yong Paek,
  • Song-Ho Pak,
  • Chol-Jun Hwang,
  • Chol-Hwan Kang

摘要

In this paper, we propose a quantitative parameter tuning rule of second-order linear active disturbance rejection controller (LADRC) for high-order plus delay time (HOPDT) processes based on analysis of frequency domain. Especially, we focus on the study of the open-loop frequency transfer function because the open-loop transfer function based on second-order LADRC in general HOPDT processes has integral characteristic. A novelty of the paper is to derive the equation of the vertical asymptote in the Nyquist plot and to propose a quantitative parameter tuning rule for a second-order LADRC through a detailed analysis. The results of simulation and comparison demonstrated the superiority of the proposed tuning rule. The practical validation of the flocculant dosing control of water treatment process has fully shown the promising potential that the proposed parameter tuning rule is more applicable to process control practices.