Design and implementation of an improved linear quadratic regulation control for oxygen content in a coke furnace

Ridong Zhang; Zhixing Cao; Ping Li; Furong Gao

Design and implementation of an improved linear quadratic regulation control for oxygen content in a coke furnace

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Author(s): Ridong Zhang ^{1, 2} ; Zhixing Cao ² ; Ping Li ³ ; Furong Gao ²
- Affiliations: 1: Automation Department, Information and Control Institute, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China;
  2: Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People's Republic of China;
  3: Information and Control Engineering School, Liaoning Shihua University, Fushun 113001, People's Republic of China
Source: Volume 8, Issue 14, 18 September 2014, p. 1303 – 1311
DOI: 10.1049/iet-cta.2013.1023 , Print ISSN 1751-8644, Online ISSN 1751-8652

Received 19/11/2013, Accepted 10/03/2014, Revised 25/02/2014, Published 30/06/2014

In view of the performance deterioration of conventional model predictive control strategies under model/plant mismatches, this study first proposes an improved linear quadratic regulation control (LQR) strategy and then tests it on the oxygen content in an industrial coke furnace. The control system design consists of two steps. Based on the direct use of the measured input and output variables and the formulation of output error, a state space model is first developed. Then, by incorporating the dynamics of process states into the cost function of the controller design, a new LQR is proposed to obtain an improved performance for closed-loop control systems. Comparisons with conventional state space model predictive control are also given in terms of both regulatory and servo performance. The case study on the oxygen content in the coke furnace shows that the proposed improves control performance under model/plant mismatches.

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Design and implementation of an improved linear quadratic regulation control for oxygen content in a coke furnace

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