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Composite Nonlinear Feedback Control of a Chemical Reactor

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Original languageEnglish
Title of host publicationProceedings of AutomaatioXXI, The Industrial Revolution of Internet – From Intelligent Devices to Networked Intelligence
Place of PublicationHelsinki, Finland
PublisherSuomen Automaatioseura ry
ISBN (Electronic)978-952-5183-46-7
Publication statusPublished - 18 Mar 2015
Publication typeA4 Article in a conference publication
EventAutomaatioseminaari - , Finland
Duration: 1 Jan 1980 → …

Publication series

NameSAS julkaisusarja
PublisherFinnish Society of Automation


Period1/01/80 → …


This paper studies the application of composite nonlinear feedback (CNF) control for a continuous time stirred tank reactor. Inside the reactor, an exothermic chemical reaction occurs, which requires cooling when concentration is commanded from low to high conversion rate to prevent a thermal runaway. A full-state CNF controller is designed for adjusting the temperature of the cooling jacket using concentration and temperature measurements. A continuous time gain-scheduled cascade controller, as well as a model predictive controller (MPC) is also fabricated for comparison. The gain-scheduled cascade controller has a proportional-integral (PI) controller as a primary loop controller, and a P-controller as a secondary loop controller. The simulation results show that the CNF controller is able to offer the best overall tracking performance as measured by the integral-of-absolute-error (IAE) criterion. In addition, the CNF controller does not need gain-scheduling for tuning purposes; the CNF controller is capable of changing its tuning as a function of control error only.


  • exothermic reaction, nonlinear control, nonlinear dynamics, cascade control

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