Artículo
Conditions for Offset Elimination in State Space Receding Horizon Controllers: A Tutorial Analysis
Fecha de publicación:
12/2008
Editorial:
Elsevier
Revista:
Chemical Engineering and Processing
ISSN:
0255-2701
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
An offset-free control is one that drives the controlled outputs to their desired targets at steady state. In the linear model predictive control (MPC) framework, the elimination of steady-state offset may seem a little obscure, since the closed-loop optimization tends to hide the integral action. Theoretically, implementing a well-posed optimization problem and having unbiased steady-state predictions are sufficient conditions to eliminate the output offset. However, these basic conditions are not always achieved in practical applications, especially when state-space models are used to perform the output predictions. This paper presents a detailed practical analysis of the existing strategies to eliminate offset when using linear state-space models with moderated uncertainties. The effectiveness of these strategies is demonstrated by simulating three different control problems: a linear SISO system where the effect of using the estimation of the control variable is highlighted, a continuous stirred tank reactor (CSTR) with non-linear dynamics and the consequent model uncertainty and, a 2×2 system representing a distillation column that verifies the consistency of previous results and extends the conclusions to higher dimension systems.
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Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
González, Alejandro Hernán; Adam, Eduardo Jose; Marchetti, Jacinto Luis; Conditions for Offset Elimination in State Space Receding Horizon Controllers: A Tutorial Analysis; Elsevier; Chemical Engineering and Processing; 47; 12; 12-2008; 2184-2194
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