Dynamic nonlinear feedback for temperature control of continuous stirred reactor with complex behavior

 

Pablo A. López Pérez¹, Ricardo Aguilar–López²*

 

^1,2 Departamento de Biotecnología y Bioingeniería, Centro de Investigación y de Estudios Avanzados del I.P.N., CINVESTAV–IPN Av. Instituto Politécnico Nacional No. 2508, San Pedro Zacatenco, México, D.F. 07360. *raguilar@cinvestav.mx

 

ABSTRACT

The main objective of this work is to present an alternative methodology for the design of a class of integral high order sliding–mode controller applied to a class of continuous chemical reactor with complex behavior for temperature tracking purposes. The proposed design is based on the differential geometry framework, where the named reaching trajectory contains a high order sliding mode term in order to diminish chattering. Considering that the proposed technique is model based, an observer–based uncertainty estimator is coupled, which provides robustness against model uncertainties and noisy measurements. Numerical simulations are performed in order to show the capacities of the proposed controller, which is compared with other nonlinear methodologies.

Keywords: Chemical Reactor, Temperature tracking, observer based high order sliding mode controller, robust performance.

 

RESUMEN

El principal objetivo de este trabajo es presentar una metodología alternativa para el diseño de una clase de controlador integral de tipo modo deslizante de alto orden, que es aplicado a un reactor químico continuo con comportamiento complejo con fines de seguimiento de temperatura. El diseño propuesto se realiza bajo el marco de la geometría diferencial, donde la denominada trayectoria guía contiene un termino de tipo deslizante de alto orden con el fin de disminuir los problemas de oscilaciones. Considerando que la metodología propuesta está basada en el modelo de la planta, se acopla un estimador de incertidumbres basado en un observador, el cual provee condiciones de robustez contra errores de modelado y ruido en las mediciones. Simulaciones numéricas son realizadas para mostrar las capacidades del controlador propuesto, el cual es comparado con otras metodologías no lineales.

Palabras clave: Reactor químico, seguimiento de temperatura, controlador de modo deslizante de alto orden basado en observador, desempeño robusto.

 

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