Abstract

ORELLANA PRATO, Rafael; CORONEL MENDEZ, María  and  ROJAS SULBARAN, Rubén. Effect of decoupling techniques in multivariable systems. Ing. Desarro. [online]. 2017, vol.35, n.2, pp.471-490. ISSN 0122-3461.

This paper presents a performance analysis of decoupling methods considering its effect in the global system and the control system per formance. The system performance was studied using static gain (DGE), approximation dead time (DTM) and feedforward (DAA) decoupling methods. As study case a multivariable (2x2) first order plus dead time model of a Wood and Berry distillation column was used. The performance of the decoupling methods were analyzed for modelling errors in the parameters: static gain (K), time constant (τ) and dead time (t0). Decoupling techniques were evaluated using a PID control scheme strategy, testing the control system robustness against modelling errors and set point changes. It was proved that for static gain (K) and time constant (τ) parameter changes, the feedforward decoupling (DAA) presents better performance using the IAE criteria. The effects for dead time changes are not significative, showing IAE variations of 0,05% for distillation column set point changes.

Keywords : Control; decoupling; interaction; multivariable.

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