Backstepping-based cascade control scheme for batch distillation columns

Rosendo Monroy‐Loperena

doi:10.1002/aic.10184

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Backstepping-based cascade control scheme for batch distillation columns

2004-08-16

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Rosendo Monroy‐Loperena *

José Álvarez‐Ramírez

DOI：10.1002/aic.10184

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Abstract

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Nonstationary dynamics, finite-time operation, large thermodynamical uncertainty and delayed composition measurements make the control of batch distillation processes a challenging and interesting problem. In this paper, a cascade control design to regulate the overhead composition of a batch distillation column is presented. The controller is designed within the framework of robust nonlinear control with modeling error compensation techniques in conjunction with a backstepping approach. The result is a cascade controller with a master loop that, driven by the composition regulation error, produces a time-varying set point for the temperature in a certain tray; and with a secondary controller that manipulates the internal reflux ratio to track the time-varying set point determined by the master composition loop. How to extend the controller design to have multiple slave temperature controllers, to improve the regulation of the overhead composition in a batch distillation column, is also presented. The proposed control approach is illustrated by numerical simulations on a full dynamical model. (C) 2004 American Institute of Chemical Engineers.

Keywords:

batch distillation

composition control

backstepping design

cascade control

low gain

high gain

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