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Plant-wide hierarchical optimal control of a crystallization process

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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Gross error management in data reconciliation

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IFAC-PapersOnLine 2015年第8期48卷 623-628页

作者： M.J. Fuente G. Gutierrez E. Gomez D. Sarabia C. de Prada Dpt. of Systems Engineering and Automatic Control EII University of Valladolid c/ Real de Burgos 47011 Spain Dpt of Electromechanical Eng. University of Burgos Avda. Cantabria s/n 09006 Burgos

This paper reviews the problems associated to the presence of gross errors in data reconciliation problems as well as the main approaches to avoid their undesirable effects: detection and removal of the faulty measurements and minimization of their effect on the reconciled results by using robust estimators that modify the cost function. In the first case, Principal Component Analysis is used to detect the gross errors while, in the second, the Fair function is used. A combined approach is also presented that improves the PCA results. The methods are evaluated in a realistic large-scale problem with plant data corresponding to the hydrogen network of a petrol refinery.

关键词： Data reconciliation Gross error detection PCA robust estimators hydrogen networks

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Modifier-Adaptation methodology for RTO applied to Distillation Columns

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IFAC-PapersOnLine 2015年第8期48卷 223-228页

作者： T. Rodriguez-Blanco D. Sarabia D. Navia C. De Prada Dpt of Systems Engineering and Automatic Control University of Valladolid Doctor Mergelina s/n 47011 Valladolid Spain Dpt of Electromechanical Engineering University of Burgos Avda. Cantabria s/n 09006 Burgos Dpt. Ingenieria Quimica y Ambiental Universidad Tecnica Federico Santa Maria Santiago Chile

Optimal process operation is not always guaranteed due to the presence of significant uncertainty about the plant models that are used to make decisions, for example in Real time optimization, and also due to the differences between control architecture layers which operate on different time-scales and use different kind of models. Modifier adaptation is a methodology that achieves optimality despite the presence of uncertainty by using plant measurements. This paper presents the Nested modifier-adaptation methodology applied to the operation of distillation columns and the results obtained are compared with the previous modifier adaptation methodology using dual control optimization.

关键词： Real Time Optimization modifier-adaptation uncertainty distillation columns optimization problems

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Mixed modifier-adaptation for RTO in a continuous bioreactor 19

Mixed modifier-adaptation for RTO in a continuous bioreactor

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Navia, Daniel Gutiérrez, Gloria De Prada, César Dpt. Ingeniería Química y Ambiental Universidad Técnica Federico Santa María Santiago Chile Dpt. Systems Engineering and Automatic Control University of Valladolid c/Real de Burgos s/n Valladolid47011 Spain

ISBN: (纸本)9783902823625

This paper deals with the problem of optimizing the performance of a process using Real Time Optimization (RTO) considering the unavoidable errors in the process models. It implements a new architecture within the modifier-adaptation methodology, presenting a nested optimization problem with two layers. With this methodology, it is possible to find a point that satisfies the KKT conditions of a process using an inaccurate model in the optimization, without the need to estimate directly the experimental gradients of the process. The suggested methodology has been tested in a continuous bioreactor example that present a washout closer to the real optimum of the simulated process. The results show that the proposed methodology is able to find the optimum of the process smoothly, avoiding unstable operating points. © IFAC.

关键词： Bioreactors

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Mixed Modifier-Adaptation for RTO in a Continuous Bioreactor

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IFAC Proceedings Volumes 2014年第3期47卷 7635-7640页

作者： Daniel Navia Gloria Gutiérrez César de Prada Dpt. Ingeniería Química y Ambiental Universidad Técnica Federico Santa María Santiago Chile Dpt. Systems Engineering and Automatic Control University of Valladolidc/ Real de Burgos s/n 47011

关键词： Real time optimization Nested modifier-adaptation Modifier adaptation uncertainty

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Coordination of distributed model predictive controllers using price-driven coordination and sensitivity analysis

Coordination of distributed model predictive controllers usi...

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10th IFAC Symposium on Dynamics and control of Process systems, DYCOPS 2013

作者： Marti, Ruben Sarabia, Daniel Navia, Daniel De Prada, Cesar Dpt. Systems Engineering and Automatic Control University of Valladolid c/ Real de Burgos s/n 47011 Valladolid Spain Dpt. Chemical and Environmental Engineering Federico Santa Maria Technical University Santiago Chile

ISBN: (纸本)9783902823595

In this paper, a coordination control algorithm based on hierarchical scheme is presented to coordinate several non-linear model predictive controllers (NMPC) working in parallel, with an upper layer, where a price-driven coordination technique is used to drive the controllers in such a way that some global constraints are satisfied. To coordinate the lower layers, it is used a price-adjustment algorithm based on Newton's method, in which a reformulation of Fiacco's work is used in order to obtain the sensitivity analysis for a nonlinear system no matter the set of active constraints. The efficiency of the scheme is evaluated using a simulation of a four-tank benchmark. © IFAC.

关键词： Sensitivity analysis

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Nested modifier-adaptation for RTO in the Otto Williams Reactor

Nested modifier-adaptation for RTO in the Otto Williams Reac...

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10th IFAC Symposium on Dynamics and control of Process systems, DYCOPS 2013

ISBN: (纸本)9783902823595

This paper deals with the problem of uncertainty management in real time optimization (RTO). It proposes a new architecture in the modifier-adaptation methodology, reformulating the algorithm as a nested optimization problem with two layers. Using this approach, it is possible to find a point that satisfies the KKT conditions of a process using an inaccurate model, but unlike the original modifier method, with no need to estimate the experimental gradients of the process. The proposed method has been tested in the Otto Williams Reactor considering structural mismatches and perfect and noisy measurements. The results are compared with the previous modifier adaptation methodology using dual control optimization showing that the method finds a KKT point of the process with the advantage that no experimental gradient information is required and with less sensitivity to process noise. © IFAC.

关键词： Optimization

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Coordination of distributed model predictive controllers using price-driven coordination and sensitivity analysis

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IFAC Proceedings Volumes 2013年第32期46卷 215-220页

作者： Marti Ruben Sarabia Daniel Navia Daniel De Prada Cesar Dpt. Systems Engineering and Automatic Control University of Valladolid c/ Real de Burgos s/n 47011 Valladolid Spain Dpt. Chemical and Environmental Engineering Federico Santa Maria Technical University Santiago Chile

关键词： Dual composition control Predictive control Price-driven Coordination Sensitivity analysis

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Nested Modifier-Adaptation for RTO in the Otto Williams Reactor

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IFAC Proceedings Volumes 2013年第32期46卷 123-128页

关键词： Process optimization Real Time Optimization modifier-adaptation direct search uncertainty

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Productiveness and Real Time Prices in energy management for HVAC systems

Productiveness and Real Time Prices in energy management for...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Jose Aguero Francisco Rodriguez Maria del Mar Castilla Mario Pereira University of Almeria Agrifood Campus of International Excellence (ceiA3) Automatic Control Electronics and Robotics Research Group University of Seville. Dpt. of Automation and System Engineering

ISBN: (纸本)9781479902255

As people usually perform their daily activities inside buildings, it is very important to achieve a trade-off between users' comfort and energy costs derived from it. This paper presents two novel concepts within the framework of energy-consumption management: productiveness and utility. Therefore, the main objective of this work is to provide an optimal forecast of the power consumption for an office room, as a function of Real-Time Prices (RTP) and Day-Ahead Pricing (DAP). The use of real time energy prices allows a more efficient management of thermal loads networks. In this work, a comfort control system for an office building is developed based on a new interpretation of the concepts of productiveness and utility, and a prediction of energy prices for the following day. In order to test the performance of the proposed control approach, simulation results obtained in a characteristic room of the CDdI-CIESOL-ARFRISOL building are included and discussed in detail. The preliminary results show an energy consumption saving approximately around 12%.

关键词： High Voltage Alternating Current systems Energy management office occupancy energy consumption Energy costs office buildings Power consumption Prices Buildings Daily Activities COMFORT

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