A Tuning Procedure for ARX-based MPC

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Abstract

We present an optimization based tuning procedure with certain robustness properties for an offset free Model Predictive Controller (MPC). The MPC is designed for univariate processes that can be represented by an ARX model. The advantage of ARX model representations is that standard system identification techniques using convex optimization can be used for identification of such models from input-output data. The stochastic model of the ARX model identified from input-output data is modified with an ARMA model designed as part of the MPC-design procedure to ensure offset-free control. The ARMAX model description resulting from the extension can be realized as a state space model in innovation form. The MPC is designed and implemented based on this state space model in innovation form. Expressions for the closed-loop dynamics of the unconstrained system is used to derive the sensitivity function of this system. The closed-loop expressions are also used to numerically evaluate absolute integral performance measures. Due to the closed-loop expressions, these evaluations can be done relative quickly. Consequently, the tuning may be performed by numerical minimization of the integrated absolute error subject to the a constraint on the maximum of the sensitivity function. The latter constraint provides a robustness measure that is essential for the procedure.
Original languageEnglish
Title of host publication2013 IEEE Multi-conference on Systems and Control
PublisherIEEE
Publication date2013
Pages188-193
ISBN (Print)978-1-4799-1557-6
DOIs
Publication statusPublished - 2013
EventIEEE Multi-Conference on Systems and Control (MSC 2013) - Hyderabad, India
Duration: 28 Aug 201330 Aug 2013
http://msc2013.org/

Conference

ConferenceIEEE Multi-Conference on Systems and Control (MSC 2013)
CountryIndia
CityHyderabad
Period28/08/201330/08/2013
Internet address

Bibliographical note

2013 IEEE Conference on Computer Aided Control System Design (CACSD). Part of 2013 IEEE Multi-Conference on Systems and Control.

Cite this

Olesen, D., Huusom, J. K., & Jørgensen, J. B. (2013). A Tuning Procedure for ARX-based MPC. In 2013 IEEE Multi-conference on Systems and Control (pp. 188-193). IEEE. https://doi.org/10.1109/CACSD.2013.6663481