可逆冷带轧机速度张力系统的分散重叠控制

Decentralized overlapping control for speed and tension in reversing cold-strip mill

中文关键词  分散重叠控制  可逆冷带轧机  速度张力系统  线性二次型最优控制

英文关键词  decentralized overlapping control  reversing cold-strip mill  speed and tension system  linear quadratic optimal control

中文摘要

      针对可逆冷带轧机速度张力系统的耦合和协调控制问题, 提出了速度张力分散重叠控制方法. 该方法首先利用包含原理和重叠结构分解, 扩展原系统的状态空间, 得到多个解耦的重叠子系统, 并应用线性二次型(LQ)最优控制和顺序设计方法, 设计各子系统的控制律. 其次, 将所设计的控制律收缩至原系统的状态空间, 得到原系统的控制器. 最后对某1422mm可逆冷带轧机的速度张力控制系统进行了仿真研究. 结果表明, 本文所提出的速度张力分散重叠控制方法能有效弱化速度与张力间的耦合, 实现主轧机与左、右卷取机间的协调控制, 同时改善了张力控制系统的动态性能, 保证了轧机升降速时的张力控制精度.

英文摘要

      To tackle the coupling between the speed and tension and to coordinate their control, we propose a decentralized overlapping control strategy for a reversing cold-strip rolling mill. The original state space is expanded into multiple decoupled overlapped subsystems based on the principles of inclusion and overlapping decomposition. The control law for each subsystem is developed by applying the linear quadratic(LQ) optimization and the sequential control method. By contracting the designed control laws to the original state space, we obtain the desired controller for the original system. A simulation is carried out on the speed and tension control system of 1422mm reversing cold-strip mill. Results show that the proposed strategy reduces the coupling between the speed and tension, realizes the coordinated control for main rolling, the left and right coilers, improves the dynamic performance of the tension control system and raises the precision of the tension during acceleration and deceleration.