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Hierarchical Optimal Operation of Continuous-Batch Processes

IFAC-PapersOnLine 2015年第23期48卷 294-301页

作者： De Prada, C. Cristea, S.P. Mazaeda, R. Dpt. of Systems Engineering and Automatic Control University of Valladolid Valladolid47011 Spain

This paper presents a methodology for the optimal operation of mixed continuous-batch processes based on a hierarchical decomposition of the problem: local dynamic optimizers perform the economic optimization of the batch units or continuous plants, while the upper layer deals with the scheduling of the batch units and the coordination of the flows and properties of sub-processes using a novel simplified model built with predictions from the lower level. The approach is illustrated with a case study from the sugar industry corresponding to the joint operation of the evaporation and crystallization sections operated to maximize production with minimum energy consumption. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Sugar industry Batch data processing Energy utilization Hierarchical systems Optimization Scheduling algorithms Continuous batch Continuous plant Economic optimization Hierarchical control Hierarchical decompositions Minimum energy consumption NMPC Optimal operation

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Integrated closed loop control and process design 8th

Integrated closed loop control and process design

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8th IFAC Symposium on Dynamics and control of Process systems, 2007

作者： Gutiérrez, Gloria Vega, Pastora De Prada, César Dpt. Systems Engineering and Automatic Control University of Valladolid Spain Dpt. Computing and Automatic Control University of Salamanca Spain

The joint design of processes and control is an integration technique that incorporates control requirements in the process design stage. This paper presents an integrated design methodology and illustrate it with an alternative design for a real plant of activated sludge processing. The process design obtained is not only optimum from the economic point of view, but exhibits certain previously fixed dynamic characteristics. The point of operation and the size of the processing units are obtained through mathematical programming, together with the parameters of the controller. © Copyright 2007 IFAC.

关键词： Process design

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Communications in distributed control environment with dynamic configuration 15th

Communications in distributed control environment with dynam...

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15th World Congress of the International Federation of automatic control, 2002

作者： Alves, Raúl García, Miguel A. Dpt. of Systems Engineering and Automatic Control University of Valladolid Spain

ISBN: (纸本)9783902661746

Distributed control systems (DCS) are based on assignments of control loops and supervision points to different units. In a first approach, these assignments are made statically and following given distribution criteria. This paper presents a proposal of communications system over a DCS which allows the interchanging of assignments between the control units. The objective is to provide a frame for dynamical load balancing in the system with reactivity against meaningful variables in the system such as changes in the process, traffic demands or computing load in every processor. Copyright © 2002 IFAC.

关键词： Distributed parameter control systems

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Modifier-Adaptation approach to deal with structural and parametric uncertainty

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IFAC-PapersOnLine 2016年第7期49卷 851-856页

作者： Rodríguez-Blanco, T. Sarabia, D. De Prada, C. Dpt of Systems Engineering and Automatic Control University of Valladolid Doctor Mergelina s/n Valladolid47011 Spain Dpt of Electromechanical Engineering University of Burgos Avda. Cantabria s/n Burgos09006 Spain

Real-Time Optimization (RTO) is not always able to achieve optimal process operation due to the presence of significant uncertainty about the plant models that are used to make decisions and also due to the differences between control architecture layers which operate on different time-scales and use different kind of models. To overcome these issues the economic optimization problem is modified following the Modifier Adaptation methodology to bring the process to the real optimum despite the presence of uncertainty by using plant measurements. To deal with parametric and structural plant-model mismatch, a new approach is presented that combines the estimation of process gradients from transient and steady-state information. It speeds up the convergence of Modifier Adaptation methodology to the process optimum. The approach is illustrated through the simulated example of a depropanizer distillation column. © 2016

关键词： Distillation columns Uncertainty analysis control architecture Economic optimization Estimation of process modifier adaptation Parametric uncertainties Plant model mismatches Real time optimization uncertainty

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Selection of time-after-injection in bone scanning using compartmental observers

Selection of time-after-injection in bone scanning using com...

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作者： Tadeo, Fernando Rami, Mustapha Ait Dpt. of Systems Engineering and Automatic Control University of Valladolid 47005 Valladolid Spain

ISBN: (纸本)9789881701299

An approach to assist the determination of the best time-after-injection for taking an scintigram in bone scanning is proposed. More precisely, a technique is discussed to estimate the evolution of the portions, in different compartments of the body, of the injected dose using a model of the radionuclide distribution dynamics, the available measurements and information on variations of the parameters. At each time, the possible range of variation of these unmeasured states is evaluated, and from this the expected evolution of the contrast of the image is obtained. This makes it possible to predict the best time for taking the image. To show the applicability, a practical example is provided.

关键词： Scanning

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Hybrid control of a four tanks system 7th

Hybrid control of a four tanks system

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7th International Symposium on Advanced control of Chemical Processes, ADCHEM 2003

作者： de Prada, C. Cristea, S. Megias, D. Serrano, J. Dpt. Systems Engineering and Automatic Control University of Valladolid Faculty ofSciences c/ Real de Burgos s/n Valladolid47011 Spain Dpt. Systems Engineering and Automatic Control ETSE Universitat Autónoma de Barcelona Bellaterra Barcelona08193 Spain

Many processes, even being of a continuous nature, involve in its operation signals or rules different from the classical continuous variables represented by real variables and modelled by DAE. In practice they include on/off valves or other binary actuators, are subjected to logical operational rules, or are mixed with sequential operations. As a result, classical control does not fit very well with the overall operation of the plant. In this paper we consider the problem of hybrid control from a predictive control perspective, showing in a practical non trivial example with changing process structure, how the problem can be stated and solved. Copyright © IFAC 2003

关键词： Real variables

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Optimal start-up of an evaporation station 8th

Optimal start-up of an evaporation station

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8th IFAC Symposium on Dynamics and control of Process systems, 2007

作者： De Prada, Cesar Cristea, Smaranda Rosano, Juan José Dpt. of Systems Engineering and Automatic Control University of Valladolid c/ Real de Burgos s/n Valladolid47011 Spain

This paper describes the main results obtained so far in the problem of the optimal startup of an industrial evaporation station involving continuous as well as discrete real time decisions. © Copyright 2007 IFAC.

关键词： Hybrid systems

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INTEGRATED CLOSED LOOP control AND PROCESS DESIGN

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IFAC Proceedings Volumes 2007年第5期40卷 243-248页

作者： Gloria Gutiérrez Pastora Vega César de Prada Dpt. Systems Engineering and Automatic Control University of Valladolid Spain Dpt. Computing and Automatic Control University of Salamanca Spain

关键词： integrated process and control design process optimization process synthesis process modelling

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Plant-wide hierarchical optimal control of a crystallization process

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IFAC-PapersOnLine 2015年第8期48卷 1210-1215页

作者： Rogelio Mazaeda Smaranda P. Cristea Cesar de Prada Dpt.of Systems Engineering and Automatic Control University of Valladolid Spain

This paper deals with the dynamic real time optimization of a benchmark model that represents a genuine problem found at the crystallization section of sugar factories. A most relevant characteristic of the control problem is given by its hybrid nature, mixing continuous control and the scheduling of the crystallizer batch units. The plant-wide optimal control task is approached in a non-centralized hierarchical way with two-layers. The lower layer consists of a set of MPCs, one for each crystallizer, and is in charge of taking the local decisions that minimize an index related with the economic behavior of each unit. The higher level coordinator layer drives the state of the whole plant near the overall economic optimum, while respecting the constraints imposed by the existence of shared resources.

关键词： Predictive control process control hierarchical control integrated scheduling and continuous plant control hybrid optimal control

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COMMUNICATIONS IN DISTRIBUTED control ENVIRONMENT WITH DYNAMIC CONFIGURATION

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IFAC Proceedings Volumes 2002年第1期35卷 201-206页

作者： Raúl Alves Miguel A. García Dpt. of Systems Engineering and Automatic Control University of Valladolid Spain

关键词： Distributed control dynamic configuration protocols load balancing

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