ADVANCED CONTROL AND ON-LINE PROCESS OPTIMIZATION IN MULTILAYER STRUCTURES

The aim of the paper is to present the place, role and mutual interaction of advanced control algorithms and on-line set-point optimization in multilayer process control structures. First, such a structure resulting from a functional decomposition is presented. The role and selected realizations of advanced control algorithms, in particular mostly applied now MPC ones, at direct control and constraint control layers is discussed. Then possible solutions to on-line set-point optimization, depending of disturbance dynamics, are presented: dynamic set-point optimization including involved structures based on temporal decomposition, and steady-state set-point optimization for cases with disturbance dynamics both much slower and comparable with the process dynamics. For the last case, important in industrial practice, different structures of interaction and even integration of MPC and steady-state optimization are discussed. The topics are illustrated by briefly presented examples, selected from given references.