Loading...

Hierarchical optimal control of a binary distillation column

Ramezani, M. H ; Sharif University of Technology | 2018

857 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/oca.2473
  3. Publisher: John Wiley and Sons Ltd , 2018
  4. Abstract:
  5. This paper presents a two-level optimal control for the binary distillation column. From the control point of view, the binary distillation column is a high-order system consisting of several interconnected subsystems (trays) that aim to maximize output purity. Controlling the system in a hierarchical manner not only decreases complexity and solution time but also can improve the control structure's reliability. In this study, the distillation column is decomposed into NT second-order subsystems, each representing one stage (one tray). Accordingly, the cost function is decomposed, and thus, the overall problem is converted into NT lower-order subproblems where each tray has its own controller. A two-level interaction prediction approach provides optimal control for the overall system. The task of the first level is to solve the subproblems using the predicted values of the coordination parameters, whereas the second level acts as a coordinator to update the coordination parameters. Simulation results show the capability and efficacy of the proposed two-level control method in finding the optimal solution with less complexity and lower solution time than those of the centralized method. © 2018 John Wiley & Sons, Ltd
  6. Keywords:
  7. Distillation column ; Interaction-prediction approach ; Large-scale systems ; optimal control ; Cost functions ; Hierarchical systems ; Large scale systems ; Binary distillation columns ; Hierarchical control ; Hierarchical optimal control ; High order systems ; Interaction prediction ; Interconnected subsystems ; Optimal controls ; Two-level control ; Distillation columns
  8. Source: Optimal Control Applications and Methods ; 2018 ; 01432087 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/full/10.1002/oca.2473