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Indexed by:期刊论文

Date of Publication:2016-07-01

Journal:ISA TRANSACTIONS

Included Journals:EI、PubMed、SCIE

Volume:63

Issue:63

Page Number:121-132

ISSN No.:0019-0578

Key Words:Integrating and unstable processes; Time delay; Two-degree-of-freedom control; Discrete-time domain; Controller design; Robust stability

Abstract:A discrete-time domain two-degree-of-freedom (2DOF) design method is proposed for integrating and unstable processes with time delay. Based on a 2DOF control structure recently developed, a controller is analytically designed in terms of the H-2 optimal control performance specification for the set-point tracking, and another controller is derived by proposing the desired closed-loop transfer function for load disturbance rejection. Both controllers can be tuned relatively independent to realize control optimization. Analytical expression of the set-point response is given for quantitatively tuning the single adjustable parameter in the set-point tracking controller. At the meantime, sufficient and necessary conditions for holding robust stability of the closed-loop control system are established for tuning another adjustable parameter in the disturbance rejection controller, along with numerical tuning guidelines. Illustrative examples from the literature are used to demonstrate the effectiveness of the proposed method. (C) 2016 ISA. Published by Elsevier Ltd. All rights reserved.