连铸结晶器多变量系统建模及控制  

Modeling of mould multivariable system in continuous casting process and its control

作　　者：李壮举[1] 王允建[2] 肖磊[3] 

机构地区：[1]北京建筑工程学院电信学院,北京100044 [2]河南理工大学电气工程与自动化学院,河南焦作454000 [3]北京科技大学信息工程学院,北京100083

出　　处：《中南大学学报（自然科学版）》2011年第5期1361-1368,共8页Journal of Central South University:Science and Technology

基　　金：北京市教委重点学科共建项目(XK100080537)

摘　　要：为了实现连铸结晶器出口坯壳厚度的控制,对结晶器内部钢水凝固传热过程进行数学模拟,利用有限元计算分析和曲线回归的方法建立其出口坯壳厚度生长模型和出口处铜板温度与坯壳厚度的关系;在此基础上,建立以拉坯速度和滑动水口开度为输入、以液位高度和出口坯壳厚度为输出的结晶器非线性多变量模型。通过仿真验证该模型的有效性。针对所建非线性模型,设计自抗扰控制器(ADRC)进行解耦控制。仿真结果表明:所设计的控制器可以达到满意的控制和解耦效果,这说明在所建模型基础上设计出ADRC控制器,实现对出口坯壳厚度的控制是可行的。To realize the control of the shell thickness at the mould exit control in continuous casting process, the solidification and heat transfer process in mould were simulated, a model of shell growth was founded and the relationship between shell thickness-temperature at the mould exit was established through finite element analysis and curvilinear regression method. Based on this model, a nonlinear multivariable mode of the mould system was built with its inputs （i.e., casting speed and valve position） and its outputs （i.e., mould level and shell thickness） at the mould exit. ADRC （Active disturbance rejection controller） was designed for the mode. The control simulation results show that the controller has good performance, and the new model is effective and accurate, indicating that the accurate shell thickness control with the novel model is feasible.

关 键 词：结晶器 出口坯壳厚度 非线性多变量模型 凝固传热模型 自抗扰控制 

分 类 号：TF341.6[冶金工程—冶金机械及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]