DocumentCode :
2447423
Title :
Non-interactive robust tension control for the looper system via disturbance observer
Author :
Noh, Ilhwan ; Won, Sangehul
Author_Institution :
Grad. Inst. of Ferrous Technol., Postech, Pohang
fYear :
2008
fDate :
10-13 Nov. 2008
Firstpage :
280
Lastpage :
285
Abstract :
In the rolling mill system of steel making process, the uniform strip tension and looper position are very important, because they affect the dimensional quality of product. However, the disturbances from several sources and the interaction between the looper angle and the strip tension make it difficult to control the system. Up to now, various kinds of control method are proposed, and non-interactive control (NIC) is one of them. General NIC uses the cross controller to cancel out the interaction terms, then the system is decoupled into two independent SISO(single-input single-output) subsystems. However, the looper system model is usually linearized around the operating state since the original model is highly non-linear. So there would be the system uncertainties as well as other unknown disturbances, which can not be removed by cross controller. In this paper, we propose the disturbance observer instead of cross-controller to decouple the looper system. Disturbance observer detects not only the interaction terms but also the uncertainties and disturbances from system input and states. So the bad effect of uncertainties can be reduced by proposed method. And a robust controller is designed to cover the estimation error of disturbance observer.
Keywords :
control system synthesis; estimation theory; linearisation techniques; mechanical variables control; observers; position control; robust control; rolling mills; steel industry; strips; uncertain systems; cross controller; disturbance observer; estimation error; looper system model; non-interactive control; non-interactive robust tension control; product dimensional quality; robust controller design; rolling mill system; single-input single-output subsystem; steel making process; uncertain system; uniform strip tension; Control systems; Robust control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE
Conference_Location :
Orlando, FL
ISSN :
1553-572X
Print_ISBN :
978-1-4244-1767-4
Electronic_ISBN :
1553-572X
Type :
conf
DOI :
10.1109/IECON.2008.4757966
Filename :
4757966
Link To Document :
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