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A stabilizing model-based predictive control algorithm for nonlinear systems

delete2001-09-01
delete284
PRE
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L
Lalo Magni *
G
Giuseppe De Nicolao
L
Lorenzo Magnani
R
Riccardo Scattolini
DOI:10.1016/S0005-1098(01)00083-8delete
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Abstract

Abstract

En 中文
Predictive control of nonlinear systems subject to state and input constraints is considered. Given an auxiliary linear control law, a good nonlinear receding-horizon controller should (i) be computationally feasible, (ii) enlarge the stability region of the auxiliary controller, and (iii) approximate the optimal nonlinear infinite-horizon controller in a neighbourhood of the equilibrium. The proposed scheme achieves these objectives by using a prediction horizon longer than the control one in the finite-horizon cost function. This means that optimization is carried out only with respect to the first few input moves whereas the state movement is predicted (and penalized) over a longer horizon where the remaining input moves are computed using the auxiliary linear control law. Closed-loop stability is ensured by means of a penalty on the terminal state which is a computable approximation of the infinite-horizon cost associated with the auxiliary controller. As an illustrative example, the predictive control of a highly nonlinear chemical reactor is discussed. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keywords:
model predictive control
receding-horizon control
nonlinear control
output admissible set
performance
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Journal

Automatica cover
Automatica
IF:
5.9
Papers:
1.2W
Citations:
5.2W

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