On the tuning of predictive controllers: Impact of disturbances, constraints, and feedback structure

• Published in: AIChE journal Vol. 60; no. 10; pp. 3473 - 3489
• Main Authors: Omell, Benjamin P., Chmielewski, Donald J.
• Format: Journal Article
• Language: English
• Published: New York Blackwell Publishing Ltd 01.10.2014; American Institute of Chemical Engineers
• Subjects: Construction; Control systems; Control theory; Controllers; Disturbances; Feedback; linear matrix inequalities; Matrix; model predictive control; Optimization; process control; process economics; Tradeoffs; Tuning
• ISSN: 0001-1541; 1547-5905
• DOI: 10.1002/aic.14529

The impact of problem formulation modifications on predictive controller tuning is investigated. First, the proposed tuning method is shown to adapt to disturbance characteristic changes and thus, takes full economic advantage of the scenario. The second topic concerns point‐wise‐in‐time constraints and the impact of constraint infeasibility. Specifically, we shift the tuning question from selection of nonintuitive weighting matrix parameters to that of a few key parameters and results in a rather intuitive trade‐off between expected profit and expected constraint violations. Finally, we show that simple modifications will allow for the consideration of various feedback structures, including computational delay and partial state information. The overall conclusions of the work are that the results of the automated algorithm will help build an intuitive understating of the dynamics of the process and ultimately result in a higher level trade‐off between profit and constraint observance. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3473–3489, 2014