Closed-loop model re-identification of processes under MPC with zone control |
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| Affiliation: | 1. Department of Chemical Engineering, Polytechnic School of the University of São Paulo, Brazil;2. Electrical Engineering Nucleus, Federal University of Sergipe, Brazil;3. PETROBRAS, Brazilian Oil Company, Brazil;1. Department of Electrical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran;2. Institute of Automation, University of Rostock, 18119 Rostock, Germany;1. College of Information Engineering, Yangzhou University, 196 Huayang Road, Yangzhou, Jiangsu, 225127, China;2. School of Computer Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, China;3. Department of Computer Science & Engineering, Washington University in Saint Louis, St. Louis, MO 63130, USA;4. School of Engineering, The University of New Mexico, Albuquerque, NM 87131, USA |
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| Abstract: | This work deals with a procedure for model re-identification of a process in closed loop with an already existing commercial MPC. The controller considered here has a two-layer structure where the upper layer performs a target calculation based on a simplified steady-state optimization of the process. Here, it is proposed a methodology where a test signal is introduced in a tuning parameter of the target calculation layer. When the outputs are controlled by zones instead of at fixed set points, the approach allows the continuous operation of the process without an excessive disruption of the operating objectives as process constraints and product specifications remain satisfied during the identification test. The application of the method is illustrated through the simulation of two processes of the oil refining industry. |
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