Real-time, nonlinear control of a constrained, nonminimum-phase process

This article presents the first real‐time implementation of a recently‐developed model‐based control method on a pilot‐scale, multivariable, liquid‐level process that exhibits inverse response and whose actuators can be saturated. Issues in real‐time implementation of the control method are discusse...

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Bibliographic Details
Published in:AIChE journal 2002-10, Vol.48 (10), p.2247-2254
Main Authors: Kanter, Joshua M., Seider, Warren D., Soroush, Masoud
Format: Article
Language:English
Subjects:
Applications of mathematics to chemical engineering. Modeling. Simulation. Optimization
Applied sciences
Chemical engineering
Computer science
control theory
systems
Control theory. Systems
Exact sciences and technology
Process control. Computer integrated manufacturing
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Summary:This article presents the first real‐time implementation of a recently‐developed model‐based control method on a pilot‐scale, multivariable, liquid‐level process that exhibits inverse response and whose actuators can be saturated. Issues in real‐time implementation of the control method are discussed, as well as a controller tuning procedure. Two model‐based controllers are implemented: one is derived using the process outputs; the other is derived using auxiliary outputs. Servo and regulatory responses presented show the differences in the performance of the two controllers. In real time, one of the model‐based controllers eliminates inverse response in one controlled output at the expense of yielding a larger inverse response in the other controlled output. This inverse‐response elimination is a real‐time validation of the linear and nonlinear theoretical results reported in the systems literature.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690481015