Iterative Learning Control Integrated with Model Predictive Control for Real-Time Disturbance Rejection of Batch Processes

• Published in: JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 50; no. 6; pp. 415 - 421
• Main Authors: Oh, Se-Kyu, Lee, Jong Min
• Format: Journal Article
• Language: English
• Published: Tokyo The Society of Chemical Engineers, Japan 2017; Taylor & Francis Group; Society of Chemical Engineers, Japan
• Subjects: Batch processes; Batch processing; Controllers; Convergence; Disturbance; Disturbance Rejection; Feedback; Feedback control; Iterative Learning Control; Iterative methods; Learning; Mathematical analysis; Mathematical models; Model Predictive Control; Non-zero Convergence; Objective function; Predictive control; Real time; Rejection
• ISSN: 0021-9592; 1881-1299; 1881-1299
• DOI: 10.1252/jcej.16we333

In the present paper, iterative learning control (ILC) is integrated with a model predictive control (MPC) technique to reject real-time disturbances. The proposed scheme is called iterative learning model predictive control (ILMPC). ILC is an effective control technique for batch processes, but it is not a real-time feedback controller. Thus, it should be combined with MPC for real-time disturbance rejection. The existing ILMPC techniques make the error converge to zero. However, if the error converges to zero, an impractical input trajectory may be calculated. We use a generalized objective function to independently tune weighting factors of manipulated variable change with respect to both the time index and batch horizons. If the generalized objective function is used, output error converges to non-zero values. We provide convergence analysis for both cases of zero convergence and non-zero convergence.(en)