A Design of Multiloop Self-Tuning PID Control Systems

Abstract

In this paper, a new multiloop self-tuning PID controller design scheme is proposed. The proposed control scheme has a static matrix pre-compensator in order to reduce the interaction terms of the process transfer function matrix. The static matrix pre-compensator is adjusted by an on-line estimator. The p×p pre-compensated system is then controlled via 'p' self-tuning PID controllers, whose parameters are adjusted by a second identifier placed around the pre-compensated plant. The PID parameters are calculated on-line based on the relationship between the PID control and generalized minimum variance control laws. The proposed scheme is experimentally evaluated on a 2×2 temperature plus level control system. Experimental results illustrate the effectiveness of the new scheme.