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Design and Implementation of an Improved and Reliable Pressurizer controller at the Paks NPP

IFAC Proceedings Volumes 2009年第8期42卷 1162-1167页

作者： Tamás Bartha Csaba Fazekas István Varga Systems and Control Laboratory Computer and Automation Research Institute HAS Kende u. 13-17 H-1111 Budapest Hungary

This paper presents the design and implementation of a pressure controller for the pressurizer of the primary circuit in the Paks Nuclear Power Plant (NPP) in Hungary. The controlled process is part of a highly safety-critical environment, therefore strict reliability requirements are imposed on both the hardware and the software of the controller. The implemented controller provides robust performance and it has a redundant and distributed architecture in order to meet these demands. The control system includes measurement and control PLCs, a continuous power controller and a special supervisor module. The pressure controller has been implemented and is in use in all the four units of the Paks NPP.

关键词： control system design safety-critical nuclear reactors pressure control inverse dynamics control

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Networked control approaches for a nuclear power plant pressurizer subsystem ?

Networked control approaches for a nuclear power plant press...

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1st IFAC Workshop on Estimation and control of Networked systems, NecSys'09

作者： Szederkényi, G. Péni, T. Gáspár, P. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences PO. Box 63 H-1518 Budapest Hungary

ISBN: (纸本)9783902661524

This paper extends former results about the networked reference tracking control of a pressurizer in a pressurized water nuclear power plant. An L2-gain based method is used in a deterministic framework to compute the maximum allowable transmit intervals (MATIs) for the actually implemented dynamic inversion based controller that still guarantee the required performance. Furthermore, a stochastic linear quadratic regulator with a state estimator is also designed that can take packet losses into consideration. It is shown through the comparison that both methods are applicable for networked control but the LQ controller combined with a Kalman filter has better output variance properties. © 2009 IFAC.

关键词： Nuclear power plants

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Iterative design of uncertainty models and robust controllers based on experiment data 10

Iterative design of uncertainty models and robust controller...

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2009 10th European control Conference, ECC 2009

作者： Rodonyi, Gabor Systems and Control Laboratory Computer and Automation Research Institute of Hungarian Academy of Sciences P.O. Box 63 BudapestH-1518 Hungary

ISBN: (纸本)9783952417393

An iterative uncertainty modelling and μ-synthesis method is presented for LTI systems. In many robust control problems with complex dynamical systems, there is no a priori information for designing a nonconservative and viable representation of the uncertainty. The goal of this paper is to provide a practical numerical method for improving the robust performance of the controlled system by designing an appropriate uncertainty model and a controller. In the proposed iterative algorithm the controller is designed by mu-synthesis and the frequency-dependent norm-bounds of the uncertainties are tuned to minimize the structured singular value with model validation constraints. Since the uncertainty model depends on the quality of the input-output measurements, therefore closed-loop experiments are involved in the iteration in order to improve the set of validation constraints. The efficiency of the method is justified by the simulation example of a vehicle steering problem. © 2009 EUCA.

关键词： controllers

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Applying hyperbolic wavelet constructions in the identification of signals and systems

Applying hyperbolic wavelet constructions in the identificat...

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15th IFAC Symposium on System Identification, SYSID 2009

作者： Soumelidis, Alexandros Bokor, József Schipp, Ferenc Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary Department of Numerical Analysis Eötvös Loránd University Budapest Hungary

ISBN: (纸本)9783902661470

This paper is devoted to the construction of wavelet-type transforms with the purpose to represent functions belonging to the Hardy-space H2. The concept of the affine wavelet-transform defined in the space L2 is extended to the Hardy space H2 on the basis of the Blaschke group. A discrete hyperbolic wavelet scheme is also constructed that results in computable forms. The wavelet construction obtained possesses good localization properties with respect to functions in H2, hence forms an adequate tool for signal and system identification purposes. © 2009 IFAC.

关键词： Signal analysis

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The design of a Fault-Tolerant vehicle control system

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International Journal of Vehicle Autonomous systems 2009年第1-2期7卷 36-55页

作者： Gáspár, Péter Szabó, Zoltán Bokor, József Computer and Automation Research Institute Systems and Control Laboratory Hungarian Academy of Sciences Hungary

To improve the performance properties of heavy vehicles, i.e., to reduce the risk of rollovers, to improve passenger comfort and road holding, a reconfigurable fault-tolerant control design of the active suspensions and the active brake is performed. However, when a fault (loss in effectiveness) occurs at one of the suspension actuators a reconfiguration is needed in order to maintain the same performance level. The detection of the fault is based on a Fault Detection and Identification (FDI) filter, which is based on an observer design. The proposed reconfiguration scheme is based on an ℋ∞ Linear Parameter Varying (LPV) method that uses the fault information as one of the scheduling variables. The LPV based control design and the operation of the control mechanism are demonstrated in a vehicle manoeuvre. © 2009 Inderscience Enterprises Ltd.

关键词： Fault detection

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Distributed state and unknown input estimation for freeway traffic flow models 10

Distributed state and unknown input estimation for freeway t...

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2009 10th European control Conference, ECC 2009

作者： Luspay, T. Kulcsar, B. Tettamanti, T. Varga, I. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute HAS Kende u. 13.-17 BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands Department of Control and Transport Automation Budapest University of Technology and Economics Bertalan L. u. 2 BudapestH-1111 Hungary

ISBN: (纸本)9783952417393

The paper presents a joint state and unmeasured input estimation technique for a special class of nonlinear second order macroscopic traffic model. The freeway traffic system is transformed into a quasi and affine approximate Lin- ear Parameter Varying (LPV) form. Observer design technique is formulated using off-line optimization problem subjected to Linear Matrix Inequality (LMI) conditions, considering uncertain scheduling parameters. Furthermore, locally designed state estimators are interconnected to cover multiple freeway sections. The elaborated method is validated using real traffic measurements. © 2009 EUCA.

关键词： Linear matrix inequalities

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Discrete time minimax tracking control with disturbance estimation 10

Discrete time minimax tracking control with disturbance esti...

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2009 10th European control Conference, ECC 2009

作者： Bauer, Peter Kulcsar, Balazs Bokor, Jozsef Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands

ISBN: (纸本)9783952417393

The paper proposes an alternative way to solve robust reference tracking problem. Instead of rejecting the effect of the disturbance directly, an intermediate step is built into the state estimation problem. The advantage of the methodology is to elaborate a modified optimal state estimation problem taking the unbiased estimate of the disturbance into account. Henceforward, the solution of the discrete time, optimal LQ minimax tracking problem is modified and subjected to attenuate the disturbance residual. The paper addresses the nominal case for constant reference and disturbance signal showing the asymptotical stability and the tracking performance of the discrete time, optimal min-max control. Suboptimal solution is given for time varying reference and disturbance signal. A linearized hovering quadrotor example demonstrates the importance of the suggested technique. © 2009 EUCA.

关键词： State estimation

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Estimating the state of distributed dynamical systems based on limited measurements by means of cooperative filtering with application to ad-hoc vehicle networks

Estimating the state of distributed dynamical systems based ...

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7th IFAC International Symposium on Fault Detection, Supervision and Safety of Technical systems, SAFEPROCESS'09

作者： Edelmayer, A. Miranda, M. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary Faculty of Engineering University of Los Andes Merida Venezuela

ISBN: (纸本)9783902661463

In this paper a decentralized approach to state estimation of distributed dynamical systems over unreliable communication network subject to uncertain and limited measurements is addressed. Specifically, a distributed filtering concept for enhancing the estimation accuracy of vehicles state from uncertain position data in ad-hoc vehicle networks is presented. The filter relies on a variety of position measurements obtained from the on-board vehicle positioning system, from other nearby cooperating vehicles, as well as from the immediate roadside environment via communication. Direct distance measurements between vehicles as well as between vehicles and the static elements of the roadside infrastructure can be used, if available, as highly accurate reference measurements. The paper demonstrates how successfully the idea of cooperative filtering in addressing the demands of both sensor fault tolerance and enhanced estimation accuracy in distributed systems over ad-hoc communication networks can be used. © 2009 IFAC.

关键词： State estimation

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Iterative design of uncertainty models and robust controllers based on experiment data

Iterative design of uncertainty models and robust controller...

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European control Conference (ECC)

作者： Gábor Rödönyi Systems and Control Laboratory Computer and Automation Research Institute of Hungarian Academy of Sciences Budapest Hungary

关键词： Decision support systems Europe Uncertainty Data models Robustness Optical wavelength conversion MODFETs

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Robust LPV controller synthesis with uncertainty modeling

Robust LPV controller synthesis with uncertainty modeling

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Mediterranean Conference on control and automation (MED)

作者： G. Rodonyi P. Gaspar J. Bokor Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper presents an iterative uncertainty modeling and robust controller synthesis method for linear parameter-varying (LPV) systems in linear fractional transformation (LFT) form. The goal of the method is to improve robust performance by exploiting modeling freedom in the structured uncertainty descriptions while ensuring model consistency with respect to measurement data. The proposed iterative algorithm consists of three steps: robust LPV controller synthesis, tuning of the uncertainty model and performing closed-loop experiments for new validation data.

关键词： Robust control Uncertainty control system synthesis Automatic control Iterative algorithms Robustness automation Robust stability control design Nonlinear systems

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