1450 mm冷连轧机多变量最优板形闭环控制策略研究与应用

Strategy and application of flatness control system based on multi-variable optimal control of 1450 mm cold strip mill

为了提高冷轧带钢的板形控制质量,通过理论计算结合现场生产条件制定了板形闭环控制系统的控制策略。在此基础上,设计了板形闭环控制系统的系统结构,建立了以板形调控功效为基础的多变量板形闭环控制算法。给出了分步求解各个板形调节机构调节量的计算方法,既避免了通过求导方式进行全局最优化计算时产生的矩阵奇异无解的状况,又在最大程度上降低了工作辊弯辊等调节机构输出饱和的情况。在板形闭环控制系统的设计中,给出了板形调节机构的变增益补偿设定环节。开发的冷轧板形控制系统已用于1450冷连轧机的板形控制过程中,经现场应用表明,板形闭环控制系统具有较强的消差能力,为冷轧板带生产实现精确的板形控制提供了必要条件。

In order to improve the flatness of cold rolled strips, a control strategy of flatness control system is studied based on theoretical calculations and the field production conditions. A system structure and the multi-variable optimal control model are developed based on this study results. The actuator adjustment is calculated as no solution in the global optimal calculation by derivation with a singular matrix. Moreover, a saturation output of actuators such as work rollbending can be avoided using this method. A variable gain compensation model for fatness actuators is set for the design of flatness feedback control system. The flatness control system is applied to the 1 450 tandem cold mill The application results show that the flatness control system has excellent accuracy and provides a basis for flatness control.