MPC for tracking zone regions

被引:73
|
作者
Ferramosca, A. [1 ]
Limon, D. [1 ]
Gonzalez, A. H. [2 ,3 ]
Odloak, D. [3 ]
Camacho, E. F. [1 ]
机构
[1] Univ Seville, Dept Ingn Sistemas & Automat, Escuela Super Ingenieros, Seville 41092, Spain
[2] UNL, CONICET, Inst Technol Dev Chem Ind, RA-3000 Santa Fe, Argentina
[3] Univ Sao Paulo, Dept Chem Engn, BR-61548 Sao Paulo, Brazil
关键词
Model predictive control; Tracking; Optimality; Zone control; MODEL-PREDICTIVE CONTROL; OPTIMIZATION; CONSTRAINTS;
D O I
10.1016/j.jprocont.2010.02.005
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
This paper deals with the problem of tracking target sets using a model predictive control (MPC) law. Some MPC applications require a control strategy in which some system outputs are controlled within specified ranges or zones (zone control), while some other variables - possibly including input variables - are steered to fixed target or set-point. In real applications, this problem is often overcome by including and excluding an appropriate penalization for the output errors in the control cost function. In this way, throughout the continuous operation of the process, the control system keeps switching from one controller to another, and even if a stabilizing control law is developed for each of the control configurations, switching among stable controllers not necessarily produces a stable closed loop system. From a theoretical point of view, the control objective of this kind of problem can be seen as a target set (in the output space) instead of a target point, since inside the zones there are no preferences between one point or another. In this work, a stable MPC formulation for constrained linear systems, with several practical properties is developed for this scenario. The concept of distance from a point to a set is exploited to propose an additional cost term, which ensures both, recursive feasibility and local optimality. The performance of the proposed strategy is illustrated by simulation of an ill-conditioned distillation column. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:506 / 516
页数:11
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