Control de sisttenas no lineales con retardo de tiempo variable: diseño y simulación de tres controladores de temperatura en cascada aplicado a procesos químicos con retardo de tiempo variable y perturbaciones.

Abstract

In this work, there are the design and simulation of three controllers in cascade system: PID-PID, SMC-PI, SMC-SMC, to control the mixing tank’s temperature, where there are a cold fluid W2 and a hot fluid W1 that enter in the tank to obtain a mixture to 150°F. the simulation was performed in Matlab Simulink. The tank used was proposed by Oscar Camacho and Carlos Smith.[1]. The temperature transmitter is to 125ft from the tank, this characteristic produces delays. Follow up test were performed, where the three controllers followed the reference temperature. In fact, the tank was subjected to income variations of W1 and W2 individually and simultaneously, changes that act like perturbations. W1 perturbation changes from 250 to 125lb/min while W2 perturbation changes from 0 to 30lb/min. This feature compromises the performance of PID-PID controller to reach the reference. It was observed in the results that PID-PID configuration lost the control. While SMC-PI and SMC-SMC reached temperature reference when they were subjected to perturbations (W1 and W2 simultaneously). Finally, the performance was evaluated using the index ISE for the three controllers determining that hat the best performance was obtained by SMC-SMC controller. KEYWORDS: Cascade, Controller, SMC, mixing, thank