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Operating regime-based controller strategy for
multi-product processes
Authors:
Karlene A. Hoo*, James G. Charboneau*, and Michael J. Piovoso1
*University of South Carolina,
Department of Chemical Engineering, Columbia, SC, 29208, USA
1E. I. Dupont de Nemours & Co, Wilmington, DE 19898, USA
ABSTRACT
A hybrid, dynamical supervisory control strategy
is introduced to control multi-product processes. The scheme involves the
selection of the best setpoint controller, from an existing family of feedback
controllers, to be placed into feedback with the process so as to cause the
output to track the desired setpoint. This task is performed without exhaustive
trial and error, by minimizing a specific normed output estimation error that
relates the process output to a shared controller state. The perfornlance of
the supervisory control strategy is demonstrated on a continuous-stirred tank
reactor that can be operated at three different conversion levels. However, the
most desirable operating point is open-loop unstable. Linear controllers are
designed for each operating region and the role of the supervisory control
strategy will be to determine the switching logic as different scheduling
policies are demanded.
Publication Information:
J. Process Control, Vol.7 , No.1,
pp 41-56, 1997
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