文献类型：期刊文献

英文题名：Frequency analysis and compensation of valve stiction in cascade control loops

作者：Li, Chen[1,2];Choudhury, M. A. A. Shoukat[3];Huang, Biao[2];Qian, Feng[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Adv Control & Optimizat, Shanghai 200237, Peoples R China;[2]Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada;[3]Bangladesh Univ Engn & Technol, BUET, Dept Chem Engn, Dhaka 1000, Bangladesh

年份：2014

卷号：24

期号：11

起止页码：1747

外文期刊名：JOURNAL OF PROCESS CONTROL

收录：;EI(收录号：20144500178763);WOS:【SCI-EXPANDED(收录号:WOS:000345191100009)】；

基金：The authors would like to acknowledge the supports from NSERC (Canada), AITF (Alberta,Canada), Major State Basic Research Development Program of China (2012CB720500), National Natural Science Foundation of China (61134007, 61203157), National Science Fund for Outstanding Young Scholars (61222303), Fundamental Research Funds for the Central Universities and Shanghai R&D Platform Construction Program (13DZ2295300). The first author would also like to acknowledge the support of China Scholar Council Scholarship. The authors are grateful for the support

语种：英文

外文关键词：Stiction compensation; Frequency analysis; Controller tuning; Cascade control loop

摘要：Valve stiction is often a common problem in control loops and stiction induced oscillation is the main cause of poor performance in control systems. Cascade control is extensively applied in process industry as an effective strategy to restrain disturbances and compensate process nonlinearities. In recent years many studies have been performed on the detection and quantification of valve stiction in single feedback control loops. However, there is a lack in developing a mechanism which can analyze stiction induced oscillation in cascade control loops. This work focuses on the frequency analysis of stiction induced oscillations in cascade control loops and proposes a mechanism of oscillation compensation through outer and inner controller tuning. The effect of oscillation compensation by changing control strategies is also discussed. The theoretical analysis is evaluated through simulation examples and a pilot-scale flow-level cascade control experiment. (C) 2014 Elsevier Ltd. All rights reserved.