Enhanced IMC design of load disturbance rejection for integrating and unstable processes with slow dynamics

被引:65
作者
Liu, Tao [1 ,2 ]
Gao, Furong [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China
[2] Rhein Westfal TH Aachen, AVT Proc Syst Engn, Aachen, Germany
关键词
Integrating and unstable processes; Internal model control (IMC); Load disturbance rejection; Slow dynamics; Asymptotic tracking; Robust stability; MODIFIED SMITH PREDICTOR; DEAD-TIME COMPENSATOR; 2-DEGREE-OF-FREEDOM CONTROL SCHEME; CONTROLLER-DESIGN; UNIFIED APPROACH; FILTER DESIGN; PERFORMANCE;
D O I
10.1016/j.isatra.2010.11.004
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
In view of the deficiencies in existing internal model control (IMC)-based methods for load disturbance rejection for integrating and unstable processes with slow dynamics, a modified IMC-based controller design is proposed to deal with step- or ramp-type load disturbance that is often encountered in engineering practices. By classifying the ways through which such load disturbance enters into the process, analytical controller formulae are correspondingly developed, based on a two-degree-of-freedom (2DOF) control structure that allows for separate optimization of load disturbance rejection from setpoint tracking. An obvious merit is that there is only a single adjustable parameter in the proposed controller, which in essence corresponds to the time constant of the closed-loop transfer function for load disturbance rejection, and can be monotonically tuned to meet a good trade-off between disturbance rejection performance and closed-loop robust stability. At the same time, robust tuning constraints are given to accommodate process uncertainties in practice. Illustrative examples from the recent literature are used to show effectiveness and merits of the proposed method for different cases of load disturbance. (C) 2010, ISA. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:239 / 248
页数:10
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