带钢冷轧闭环反馈控制最优化算法程序开发

基于多变量最优化控制的带钢闭环反馈控制模型能够充分利用弯辊和轧辊倾斜等平直度控制机构对板形偏差进行控制。闭环反馈控制的目的是使带钢实测板形与目标板形一致,闭环反馈最优化算法程序能充分利用输入信息,全面考虑多个执行机构对板形的作用,避免各控制之间的相互影响,它是该模型准确计算板形调节量的关键。为了实现自主建立带钢冷轧生产线,对某厂1 700 mm四机架四辊冷连轧机第四机架闭环反馈控制进行深入研究,根据对偶法采用C语言开发出基于多变量最优化闭环反馈计算程序并将其嵌入到可编程逻辑控制器(Programmable logic controller,PLC)中,开发出自主的基于多变量最优化闭环反馈控制模块。由该模块计算的闭环反馈平直度执行机构调节量与采用Matlab工具箱Quadprog函数计算结果一致,计算精度高。

Development of Optimization Algorithm for Closed-loop Feedback Control in Cold Strip Rolling

Flatness actuators such as work roll bending and roll tilting can be fully utilized to regulate flatness error by using closed-loop feedback control system based on multivariable optimization algorithm model.The aim of closed-loop feedback is to maintain flatness consistency between measured value and set value.The system can fully use input information and consider functions between multiple flatness actuators,avoiding adverse effects among each other.Therefore,optimization algorithm program is a key to accurately calculate the adjustments of actuators.In order to build cold strip production line with domestic intellectual property,closed-loop feedback control system of 1 700 mm four stands four-high tandem cold rolling mill is studied thoroughly.Dual method is used to develop multivariable optimization algorithm program in C language,which is embedded in programmable logic controller(PLC).Closed-loop feedback control module with domestic intellectual property is developed.The results derived from the module of actuators adjustment and quadratic form optimum function Quadprog in Matlab toolbox show good agreement and high accuracy.