Real-time algorithm for self-reflective model predictive control. (May 2018)

• Record Type: Journal Article
• Authors: Feng, Xuhui; Houska, Boris
• Is Part Of: Journal of process control. Volume 65(2018)
• Page Start: 68
• Page End: 77
• Publication Date: 2018-05
• Subjects: Optimal control -- Optimal experiment design -- Model predictive control; Process control -- Periodicals; Fabrication -- Contrôle -- Périodiques; Process control; Periodicals; Electronic journals; 660.281
• DOI: 10.1016/j.jprocont.2017.10.003
• Languages: English
• ISSNs: 0959-1524

Abstract

Highlights: Development of a novel real-time algorithm for MPC with learning terms. Implementation of MPC and learning with run-times in the millisecond range. Application to control of uncertain chemical processes with measurement errors. Abstract: This paper is about a real-time model predictive control (MPC) algorithm for a particular class of model based controllers, whose objective consists of a nominal tracking objective and an additional learning objective. Here, the construction of the learning term is based on an economic optimal experiment design criterion. It is added to the MPC objective in order to excite the system on purpose thereby improving the accuracy of the state and parameter estimates in the presence of incomplete or noise affected measurements. The focus of this paper is on so-called self-reflective model predictive control schemes, which have the property that the additional learning term can be interpreted as the expected loss of optimality of the controller in the presence of random measurement errors. The main contribution is a formulation-tailored algorithm, which exploits the particular structure of self-reflective MPC problems in order to speed-up the online computation. It is shown that the proposed algorithm can solve the self-reflective optimization problems with reasonable additional computational effort and in real-time.