Dynamics and control designs for internal thermally coupled distillation columns with different purities,Part 2:close loop analysis and control designs  

作　　者：ZHU Yu LIU Xinggao CHU Jian 

机构地区：[1]National Laboratory of Industrial Control Technology, Department of Control Science and Engineering, Zhejiang University, Hangzhou310027, China

出　　处：《Progress in Natural Science:Materials International》2006年第5期524-530,共7页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No. 20106008), ZJNSFC (Grant No.Y105370),National Development and Reform Commission of China (Grant No. Fagai Gaoji-2004-2080) and Science Fund for Distinguished Young Scholars of Zhejiang University (Grant No. 111000-581645)

摘　　要：Interaction between overhead and bottom composition loops of internal thermally coupled distillation columns （ITCDIC） with four purities are analyzed by means of relative gain array, condition number and singular value decomposition, which indicates that high and very high-purity ITCDIC are well coupled and ill conditioned systems with severe gain directionality problem. Based on the above dynamic behaviors, suitable control schemes of four different purity systems are studied. In low-purity system, internal model control （IMC） is better than decentralized proportion integral differential （D-PID） control in terms of response speed and remaining errors. In moderate purity system, D-PID can effectively reject large load disturbances while IMC fails due to severe mismatch between model and plant. In high purity system, neither IMC nor D-PID can provide satisfactory control so that modified IMC and multivariable PID with singular value decomposition scheme are presented respectively to improve control performances. Finally, in very high-purity systems, the combined feed-forward and feedback control scheme is proposed to deal with extremely sluggish responses to load disturbances.在开销和有四纯净的内部热地联合的蒸馏列(ITCDIC ) 的底部作文环之间的相互作用借助于相对获得数组，条件数字和单个值分解被分析，它显示那高、很高纯净的 ITCDIC 很好被联合并且有严重获得 directionality 的性恶的系统问题。基于上述动态行为，四个不同纯净系统的合适的控制计划被学习。在低纯净的系统，内部模型控制(IMC ) 比分散的比例积分好微分(D-PID ) 以反应控制速度和留下的错误。在中等纯净的系统，当 IMC 由于在模型和植物之间的严重失配失败时， D-PID 能有效地拒绝大负担骚乱。在高纯净的系统，既不 IMC 也不 D-PID 能提供令人满意的控制以便有单个值分解计划的修改 IMC 和多可变的 PID 分别地被介绍改进控制表演。在很高纯净的系统，最后，联合前馈控制和反馈控制计划被建议处理极其懒惰的回答装载骚乱。

关 键 词：ill condition gain directionality interaction RGA feed-forward. 

分 类 号：TQ063[化学工程]