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8th International Symposium on Advanced control of Chemical Processes, ADCHEM 2012

作者： De Prada, C. Gutierrez, G. Sarabia, D. Gómez, E. Méndez, C.A. Sola, J.M. González, R. Dpt. of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid Real de Burgos 47011 Spain INTEC UNL- CONICET Güemes 3450-3000 Santa Fe Argentina Repsol - YPF Edificio Muñatones c/ San Martín 5 48550 Muskiz Vizcaya Spain

ISBN: (纸本)9783902823052

This paper describes an approach to optimal management of hydrogen networks in refineries, focusing on the problems of reconfiguration that appears when, due to plant failures, the production of the hydrogen generating units suddenly decreases. The problem is formulated in terms of optimization as a MINLP one. Also, guidelines to the implementation of the optimum are presented with the aim of providing a practical solution to the inherent uncertainly and changing dynamics associated to the process. © 2012 IFAC.

关键词： Optimization

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Implementing optimal hydrogen networks management

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IFAC Proceedings Volumes 2012年第15期45卷 114-119页

作者： C. de Prada G. Gutierrez D. Sarabia E. Gómez C.A. Méndez J.M. Sola R. González Dpt. of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos 47011 Spain INTEC (UNL- CONICET) Güemes 3450-3000 Santa Fe Argentina (Repsol – YPF) Edificio Muñatones c/ San Martín 5 48550 Muskiz Vizcaya Spain

关键词： Hydrogen distribution networks RTO MINLP optimization process control data reconciliation

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Two applications of sliding mode control in energy generation and power electronics

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Lecture Notes in control and Information Sciences 2011年 412卷 439-463页

作者： Biel, D. Dòria-Cerezo, A. Fossas, E. Muñoz-Aguilar, R.S. Ramos-Lara, R. Dpt. of Electronics Spain IOC and Dpt. of Electrical Engineering Spain IOC and Dpt. of Automatic Control Spain

ISBN: (纸本)9783642221637

Introduction: Power electronics is concerned with electromechanical systems that carry power. In a wide sense, power electronics includes the analysis, synthesis and implementation of electrical motors and generators, as well as power converters. Several controllers designed in the framework of Sliding Mode can be found in specialized literature;in particular it is worth to quote the book of V.I. Utkin, J. Guldner and J. Shi [8] where several motors, generators and power converters were studied in the SMC domain. The authors took benefit of these systems to explain the advantages of SM as a robust control methodology and to show most of its applications in dynamical systems: as estimators, observers, This chapter is also devoted to electrical generators and power converters stressing implementation issues. We want to emphasize implementation procedures based on theory in front of the trial and error, a tuning method widely used even at universities. On the other way around, we are also interested in theoretical problems appeared when implementing algorithms. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Power converters

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LMIs-based coordinate descent method for solving BMIs in control design

LMIs-based coordinate descent method for solving BMIs in con...

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作者： Simon, E. R-Ayerbe, P. Stoica, C. Dumur, D. Wertz, V. Université Catholique de Louvain ICTEAM Institute Mathematical Engineering Dpt. 4 avenue Georges Lemaître 1348 Louvain-la-Neuve Belgium Automatic Control Department 3 rue Joliot Curie 91192 Gif-sur-Yvette cedex France

ISBN: (纸本)9783902661937

This work investigates the topic of solving Bilinear Matrix Inequalities (BMIs) problems in the optimal control design field, using successive resolutions of properly defined Linear Matrix Inequalities (LMIs). This technique can be described as an 'LMI-based coordinate descent method'. Indeed the original (BMI) problem is solved independently for each coordinate at each step using a LMI optimization, while the other coordinate is fixed. No method based on this idea has been formally proved to converge to the global optimum of the BMI problem, or a local optimum in general. This will be discussed using relevant results both from the mathematical programming and control design points of view. This discussion supports the algorithm proposed here which, thanks to a particular change of variables, leads to sequences of improving solutions. Also emphasized is a second improvement important to avoid in practice early convergence to suboptimal solutions instead of local optima. The control framework used is that of optimal output feedback design for linear time invariant (LTI) systems. An example using a random plant is drawn to illustrate the typical effectiveness of the algorithm. © 2011 IFAC.

关键词： Linear matrix inequalities

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LMIs-based coordinate descent method for solving BMIs in control design

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IFAC Proceedings Volumes 2011年第1期44卷 10180-10186页

作者： E. Simon P. R-Ayerbe C. Stoica D. Dumur V. Wertz Université Catholique de Louvain ICTEAM Institute Mathematical Engineering Dpt. 4 avenue Georges Lemaitre 1348 Louvain-la-Neuve Belgium SUPELEC Systems Sciences (E3S) Automatic Control Department 3 rue Joliot Curie 91192 Gif-sur-Yvette cedex France

Abstract This work investigates the topic of solving Bilinear Matrix Inequalities (BMIs) problems in the optimal control design field, using successive resolutions of properly defined Linear Matrix Inequalities (LMIs). This technique can be described as an ‘LMI-based coordinate descent method'. Indeed the original (BMI) problem is solved independently for each coordinate at each step using a LMI optimization, while the other coordinate is fixed. No method based on this idea has been formally proved to converge to the global optimum of the BMI problem, or a local optimum in general. This will be discussed using relevant results both from the mathematical programming and control design points of view. This discussion supports the algorithm proposed here which, thanks to a particular change of variables, leads to sequences of improving solutions. Also emphasized is a second improvement important to avoid in practice early convergence to suboptimal solutions instead of local optima. The control framework used is that of optimal output feedback design for linear time invariant (LTI) systems. An example using a random plant is drawn to illustrate the typical effectiveness of the algorithm.

关键词： Optimal control design BMIs LMIs Output-feedback LTI system

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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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Simplified modelling and validation of an industrial diesel hydrodesulfurization plant

Simplified modelling and validation of an industrial diesel ...

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9th International Symposium on Dynamics and control of Process systems, DYCOPS 2010

作者： Gómez, E. Sarabia, D. Cristea, S. Gutiérrez, G. Méndez, C.A. Sola, J.M. Unzueta, E. González, R. De Prada, C. Dpt. of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos 47011 Spain Güemes 3450-3000 Santa Fe Argentina Edificio Muñatones c/ San Martín 5 48550 Muskiz Vizcaya Spain

ISBN: (纸本)9783902661692

A dynamic reduced model of an industrial diesel hydrodesulfurization plant has been developed and validated against plant data. Its purpose is the prediction of the rate of hydrogen consumption, as well as some other critical variables, as a function of the hydrocarbon feed, so as to be integrated in a decision support system aimed at the operation optimization in real time of the refinery hydrogen network. A model which combines first physical-chemical principles with black box elements is proposed. Model structure and calibration procedure are described, and validation results are presented. © 2009 IFAC.

关键词： Optimization

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Simplified Modelling and Validation of an Industrial Diesel Hydrodesulfurization Plant

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IFAC Proceedings Volumes 2010年第5期43卷 218-223页

作者： E. Gómez D. Sarabia S. Cristea G. Gutiérrez C.A. Méndez J.M. Sola E. Unzueta R. Gonzàlez C. de Prada Dpt. of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos 47011 Spain INTEC (UNL- CONICET) Güemes 3450-3000 Santa Fe Argentina Petronor (Repsol – YPF) Edificio Muñatones c/San Martin 5 48550 Muskiz Vizcaya Spain

关键词： hydrodesulfurization grey-box modelling parameter estimation decision support system process optimization simulation

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Hybrid Predictive control of Supermarket Refrigeration systems: an Optimal Time Switching Strategy

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IFAC Proceedings Volumes 2008年第2期41卷 10916-10922页

作者： D. Sarabia C. de Prada Dpt. Systems Engineering and Automatic Control University of Valladolid c/Real de Burgos s/n 47011 Valladolid Spain (

This paper presents a NMPC of a supermarket refrigeration system. This is a hybrid process involving switched nonlinear dynamics and discrete events, on/off manipulated variables (valves and compressors), continuous controlled variables (goods temperatures) and finally, several operation constraints. The hybrid controller is based on a parameterization of the on/off control signals in terms of time of occurrence of events instead of using directly binary values, in this way, we can re-formulate the optimization problem as a NLP problem. Results of the hybrid controller operation are given.

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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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