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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:CHINESE JOURNAL OF CHEMICAL ENGINEERING

Included Journals:SCIE、EI、ISTIC、Scopus

Volume:23

Issue:12

Page Number:2005-2012

ISSN No.:1004-9541

Key Words:Time delay system; Output error model; Recursive least-squares; Instrumental variable; Variable forgetting factor

Abstract:To dealwith colored noise and unexpected load disturbance in identification of industrial processes with time delay, a bias-eliminated iterative least-squares (ILS) identification method is proposed in this paper to estimate the output error model parameters and time delay simultaneously. An extended observation vector is constructed to establish an ILS identification algorithm. Moreover, a variable forgetting factor is introduced to enhance the convergence rate of parameter estimation. For consistent estimation, an instrumental variable method is given to deal with the colored noise. The convergence and upper bound error of parameter estimation are analyzed. Two illustrative examples are used to show the effectiveness and merits of the proposed method. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.