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Steady-State Operability Analysis of Nonlinear Plants Using Output Controllability Index

Moradpanah, Maryam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44302 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza
  7. Abstract:
  8. Selecting an appropriate control structure is an important subject in the design of control systems. Distillation column is one of the most popular and widely used unit operations in industry which complete understanding of its operability and controllability is one of the most important issues in the process control engineering. The present work studies the method of Output Controllability Index for nonlinear systems and compares it with Relative Gain Array and Condition Number. By using this index, the extent of intrinsic controllability of a process can be identified quantitatively in the absence of any controller. Also, the controllability of the process can be stated numerically or graphically. The considered non-linear system was the binary separation of methanol and water in two different cases: Case I: single distillation column and case II: two successive distillation columns. Simulations of units have been done using Aspen HYSYS v7.3 software. To obtain the Controllability Index, Multi-Parametric Toolbox and MATLAB software have been used. Different control structures were investigated using the mentioned Index. The results show that for the case of one distillation column, the (L,V) configuration is the best structure in servo mode (set-point tracking), while the (D,V/B) is the best regulatory control configuration. In case of two distillation columns, (〖(L⁄D)〗_1,B_2) configuration is the best control configuration for both servo and regulation modes
  9. Keywords:
  10. Controllability ; Distillation Column ; Control Structure ; Nonlinear Systems

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