• 作者： Jang, Shi-Shang
• 中文摘要： 過去蒸餾控制由於其強烈之非線性及多變數問題很難加以控制,本文使用Economou et al.,1986推導之非線性模式預測控制法來試圖作蒸餾雙重控制,本文為上述方法第一次在多變數狀態下使用。原作者之方法推薦使用質能平衡之動態模式,本文發現該方法可能有顯著的改進,此外,蒸餾程序多變數內干擾的問題可以有效的使用本文方法消除。然而本文也發現所使用模式的穩定性在永久性擾動存在下可能有問題,本文於是使用了一個簡易的辨識方法來解決。
• 英文摘要： Distillation processes are very difficult to control due to their strong nonlinear property and multivariable nature. This paper is discussing an application of a newly developed method--nonlinear model predicted control(Economou, et al.). This work is the first attempt to implement the above approach in a multivariable environment. The direct use of a material-energy balance model for the above nonlinear control was recommended by the original literature. It is found that noticeable improvement compared with conventional controllers could be achieved. Furthermore, the very significant interaction problem for distillation control can be internally decoupled in the computation of control action by the numerical inverse of the process model. However, it is also found that the stability of the model could be a problem if a persistent disturbance occurred. A simple material balance to identify the inlet flow rate was implemented to tackle the stability problem and satisfactory result was achieved.
• 中文關鍵字： 非線性模型預測控制; 蒸餾塔; 多變數控制; 二元系
• 英文關鍵字： Nonlinear Model Predictive Control; Distillation Column; Binary Systems; Multivariable Control