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Hierarchical optimal control of large-scale nonlinear chemical processes

Ramezani, M. H ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.isatra.2008.08.003
  3. Publisher: 2009
  4. Abstract:
  5. In this paper, a new approach is presented for optimal control of large-scale chemical processes. In this approach, the chemical process is decomposed into smaller sub-systems at the first level, and a coordinator at the second level, for which a two-level hierarchical control strategy is designed. For this purpose, each sub-system in the first level can be solved separately, by using any conventional optimization algorithm. In the second level, the solutions obtained from the first level are coordinated using a new gradient-type strategy, which is updated by the error of the coordination vector. The proposed algorithm is used to solve the optimal control problem of a complex nonlinear chemical stirred tank reactor (CSTR), where its solution is also compared with the ones obtained using the centralized approach. The simulation results show the efficiency and the capability of the proposed hierarchical approach, in finding the optimal solution, over the centralized method. © 2008 ISA
  6. Keywords:
  7. Chemical engineering ; Chemical reactions ; Control systems ; Coordination reactions ; Hierarchical systems ; Intersections ; Optimal control systems ; Chemical processes ; Hierarchical control ; Interaction prediction approach ; Large-scale systems ; Optimal control ; Process control
  8. Source: ISA Transactions ; Volume 48, Issue 1 , January , 2009 , Pages 38-47 ; 00190578 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0019057808000487