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Title: A double two-degree-of-freedom control scheme for improved control of unstable delay processes
Authors: Lu, X.
Yang, Y.-S.
Wang, Q.-G. 
Zheng, W.-X.
Keywords: Dead time compensator
Integral squared error
Load disturbance
Modified smith predictor
Unstable process
Issue Date: Aug-2005
Source: Lu, X., Yang, Y.-S., Wang, Q.-G., Zheng, W.-X. (2005-08). A double two-degree-of-freedom control scheme for improved control of unstable delay processes. Journal of Process Control 15 (5) : 605-614. ScholarBank@NUS Repository.
Abstract: A double two-degree-of-freedom control scheme is proposed for enhanced control of unstable delay processes. The scheme is motivated by the modified Smith predictor control in [IEE Proc. Control Theory Appl. 16(5) (1999) 359] and devised to improve in the following ways: (i) one more freedom of control is introduced in our scheme to enable manipulation of disturbance transient response, and is tuned based on minimization of the integral squared error criterion; (ii) four controllers in the scheme are well placed to separately tune the denominators and numerators of closed-loop transfer functions from the set-point and disturbance. This allows easy design of each controller and good control performance for both set-point and disturbance responses. Especially, improvement of disturbance response is extremely great, compared with [IEE Proc. Control Theory Appl. 16(5) (1999) 359; Automatica 36 (2000) 1651]. Internal stability of the proposed structure is analyzed, which has not been reported in the literature on modified Smith predictor control before. Examples are provided for illustration. © 2004 Elsevier Ltd. All rights reserved.
Source Title: Journal of Process Control
ISSN: 09591524
DOI: 10.1016/j.jprocont.2004.09.002
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