SISO versus MIMO model based predictive control structures: a fed-batch crystallizer case study

Abstract

This work is focused on a comparative study of four structures of linear model predictive control (LMPC) for a fed batch crystallization process. Two single input single output (SISO) and two multiple input multiple output (MIMO) control schemes are analysed with respect to the final process quality achieved. The linear models required in the controller structures are extracted applying two identification alternatives termed as classical (one test) and double test identification. The SISO cases seem to guarantee more satisfactory end point quality of the process. However, only the LMPC of the supersaturation manipulating the steam flowrate makes feasible all conflicting control objectives.