Compound control for speed and tension multivariable coupling system of reversible cold strip mill
来源期刊：中南大学学报(英文版)2015年第2期
论文作者：FANG Yi-ming(方一鸣) LIU Le(刘乐) LI Jian-xiong(李建雄) CHANG Ru(常茹)
文章页码：529 - 538
Key words：reversible cold strip mill; speed and tension system; decoupling; invariance principle; compound control; extended state observer; global sliding mode control
Abstract: To weaken the nonlinear coupling influence among the variables in the speed and tension system of reversible cold strip mill, a compound control (CC) strategy based on invariance principle was proposed. Firstly, invariance principle was used to realize static decoupling between the speed and tension of reversible cold strip mill. Then, considering the influence caused by the time variation of steel coil radius and rotational inertia of the left and right coilers, as well as the uncertainties, a CC strategy that is composed of extended state observer (ESO) and global sliding mode control (GSMC) with backstepping adaptive was proposed, which further realized dynamic decoupling and coordination control for the speed and tension system. Theoretical analysis shows that the resulting closed-loop system is global bounded stable. Finally, the simulation was carried out on the speed and tension system of a 1422 mm reversible cold strip mill by using the actual data, and through the comparison of the other control strategies, validity of the proposed CC strategy was shown by the results.
FANG Yi-ming(方一鸣)1, 2, LIU Le(刘乐)1, LI Jian-xiong(李建雄)1, CHANG Ru(常茹)1
(1. Key Laboratory of Industrial Computer Control Engineering of Hebei Province
(Institute of Electrical Engineering, Yanshan University), Qinhuangdao 066004, China;
2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling
(Yanshan University), Qinhuangdao 066004, China)
Abstract:To weaken the nonlinear coupling influence among the variables in the speed and tension system of reversible cold strip mill, a compound control (CC) strategy based on invariance principle was proposed. Firstly, invariance principle was used to realize static decoupling between the speed and tension of reversible cold strip mill. Then, considering the influence caused by the time variation of steel coil radius and rotational inertia of the left and right coilers, as well as the uncertainties, a CC strategy that is composed of extended state observer (ESO) and global sliding mode control (GSMC) with backstepping adaptive was proposed, which further realized dynamic decoupling and coordination control for the speed and tension system. Theoretical analysis shows that the resulting closed-loop system is global bounded stable. Finally, the simulation was carried out on the speed and tension system of a 1422 mm reversible cold strip mill by using the actual data, and through the comparison of the other control strategies, validity of the proposed CC strategy was shown by the results.
Key words:reversible cold strip mill; speed and tension system; decoupling; invariance principle; compound control; extended state observer; global sliding mode control
