Predicción para control: una panorámica del control de procesos con Retardo

This paper presents an analysis of dead-time compensating controllers for processes exhibiting a dead time. The robustness and performance of several dead-time compensating control structures are analysed and the effect of the predictor on the closed-loop is studied. A unified approach is used considering ideas from “Model Pedictive Control” (MPC) and “Dead-time Compensators” (DTC). The main papers in the area are revised and the relationships between MPC and DTC are shown. The paper shows that the predictors designed to produce optimal open-loop predictions are not optimal when operating in closed loop. Furthermore, structures based on the Smith predictor offer more robust controllers and similar nominal performance even when the process exactly matches the situation required by optimal controllers. A new concept "Prediccion para Control" is introduced where predictors should be designed as an integral part of the controller in order to produce better closed-loop response.

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