Output feedback control of an unstable CSTR with measurement delay: A comparative study

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This paper presents several comparative results for three output feedback controllers, i.e., proportional-integral (PI) control, state-space formulation of nonlinear internal model control (NIMC), and dynamic output feedback control (DOFC), for exothermic parallel reactions in a continuously stirred tank reactor. Under the known measurement delay, initial operating points, and multiplicity behavior of the process, the linear PI controller with the Z-N tuning method can provide the no offset performance for set point change and disturbance rejection. Since the NIMC design incorporates an open-loop model, the output regulation of an unstable system may be obviously degraded within large operating region. The DOFC design which combines a dynamic state feedback through Fliess' linearization algorithm with a nonlinear Luenberger-type observer can provide a smooth and stable regulation response in an arbitrary operating region. With the aid of a complete theoretical analysis, it is also found that the DOFC design is robust to uncertainty and measurement delay.

Original languageEnglish
Pages (from-to)X4-37
JournalJournal of the Chinese Institute of Chemical Engineers
Issue number1
Publication statusPublished - 1998 Dec 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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