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COMMUNICATIONS IN DISTRIBUTED control ENVIRONMENT WITH DYNAMIC CONFIGURATION

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

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.

关键词： Distributed control dynamic configuration protocols load balancing

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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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A mixed continuous-batch process: Implementation of hybrid predictive controllers

A mixed continuous-batch process: Implementation of hybrid p...

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作者： Sarabia, D. De Prada, C. Cristea, S. Dpt. Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos s/n 47011 Valladolid Spain

ISBN: (纸本)9783902661074

This paper deals with a mixed continuous-batch process, a pilot plant of our Lab, where both continuous decisions and scheduling take place. The interest of this contribution comes not only from the fact that it is a challenging control problem, but because problems with a similar structure are present in many industrial process. The paper describes the process, the instrumentation (classical analogical/discrete devices, Field Bus devices) and the global architecture of the pilot plant control (Distributed control System DCS, Supervisory control and Data Acquisition SCADA, OPC communication, etc.). From a control point of view, it presents a brief description of control problem formulation in the framework of non-linear model predictive control, and a generic methodology to design this kind of predictive controllers. Finally it is presented the results of some real experiments. Copyright © 2006 IFAC.

关键词： Model predictive control

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Modelling and simulation of batch processes: A case study 15th

Modelling and simulation of batch processes: A case study

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

作者： Garcia, A. Acebes, L.F. De Prada, C. Centre of Sugar Technology University of Valladolid Spain Dpt. System Engineering and Automatic Control University of Valladolid Spain

ISBN: (纸本)9783902661746

Modelling and simulation are inseparable procedures that include the complex activities associated with the construction of models representing real processes, and experimentation with the models to obtain data on the behaviour of the system being modelled. This paper shows how an objected-oriented modelling language can be used to build the dynamic simulation model of an industrial production process that contains both continuous and bath units. The selected case of study is an essential part of a sugar factory: the sugarhouse. Copyright © 2002 IFAC.

关键词： Modeling languages

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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

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 47011 Valladolid Spain

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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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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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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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

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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NEURAL PREDICTIVE control TOOLBOX FOR CACSD IN MATLAB ENVIRONMENT

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IFAC Proceedings Volumes 2002年第1期35卷 61-66页

作者： Jesús M. Zamarreño Dpt. System Engineering and Automatic Control. University of Valladolid

This paper describes a neural predictive control toolbox developed in Matlab/Simulink environment. The application permits all phases of the system design: simulation of the plant by means of any Simulink model, loading of input/output data, definition of the neural network architecture, training, and, finally, application of the predictive control strategy based on the neural network model.

关键词： Computer-aided control systems design Predictive control Model-based control Neural control Neural networks

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Enhancing Emergency Response: The Leg-Pulling Robot for Efficient Evacuations 15

Enhancing Emergency Response: The Leg-Pulling Robot for Effi...

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15th International Conference Elektro, ELEKTRO 2024

作者： Kafkova, Julia Gazovic, Pavol Simak, Vojtech Kuchar, Pavol Pirnik, Rastislav Di Girolamo, Silvia University of Zilina FEIT Dpt. of Control and Information Systems Zilina Slovakia University of Palermo Department of Engineering Palermo Italy

ISBN: (纸本)9798350372359

This paper presents a comprehensive exploration into the critical aspect of effector design within the context of mobile platforms utilised during emergency scenarios. In times of crisis, ranging from natural disasters to man-made incidents, the efficiency and versatility of mobile platforms equipped with specialised effectors play a pivotal role in ensuring effective response and mitigation. The proposed robotic system consists of a universal platform, a robotic arm, and a custom effector with controls. Our experimental verification of the system shows promising results and the feasibility of the proposed system. © 2024 IEEE.

关键词： Robotic arms

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