Time filter

Source Type

Hangos K.M.,Computer and Automation Research Institute HAS | Hangos K.M.,University of Pannonia | Szederkenyi G.,Computer and Automation Research Institute HAS | Szederkenyi G.,Pázmány Péter Catholic University
Journal of Process Control | Year: 2014

Based on the structure of process models a hierarchically structured state-space model has been proposed for process networks with controlled mass convection and constant physico-chemical properties. Using the theory of cascade-connected nonlinear systems and the properties of Metzler and Hurwitz matrices it is shown that process systems with controlled mass convection and without sources or with stabilizing linear source terms are globally asymptotically stable. The hierarchically structured model gives rise to a distributed controller structure that is in agreement with the traditional hierarchical process control system structure where local controllers are used for mass inventory control and coordinating controllers are used for optimizing the system dynamics. The proposed distributed controller is illustrated on a simple non-isotherm jacketed chemical reactor. © 2014 Elsevier Ltd.


Fodor A.,University of Pannonia | Magyar A.,University of Pannonia | Hangos K.M.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
Chemical Engineering Transactions | Year: 2012

A multiple-input multiple-output (MIMO) LQ servo controller was proposed for an industrial size synchronous generator that keeps the active power at the desired level and performs reactive power reference tracking using the reactive power demand from the central dispatch center. The controller design was based on the locally linearized version of a previous dynamical model of the synchronous electrical generator (Anderson and Fouad, 1977, Fodor et al., 2012) the parameters of which have been identified using measured data from Paks Nuclear Power Plant, Hungary. Copyright © 2012, AIDIC Servizi S.r.l.


Werner-Stark A.,University of Pannonia | Gerzson M.,University of Pannonia | Hangos K.M.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
Proceedings of the IASTED International Conference on Modelling, Identification and Control | Year: 2011

A novel structure identification procedure for discrete event systems described by Petri nets are proposed in this paper for model-based diagnostic purposes that utilize the notions and tools of process mining. The identification of the structurally different discrete event system models describing a system in its normal and/or faulty modes was used for model-based isolation of the considered faulty modes. From the available process mining techniques that allow for the automatic construction of process models in Petri net form based on event logs, the genetic algorithm-based structure identification procedure has been found to be most capable of identifying the characteristic structural elements of the faulty models. The proposed procedures are illustrated on a simple example of an operated parking gate automaton with two faulty modes.


Magyar A.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2013

The aim of this work is to present an entropy-like Lyapunov function based dynamic feedback design technique for quasi-polynomial and Lotka-Volterra systems. It is shown, that the dynamic feedback design problem is equivalent to the feasibility of a bilinear matrix inequality. The problem is also formulated as a control Lyapunov function based feedback design when the Lyapunov function parameters are given, the solution of this problem can be obtained by solving a linear matrix inequality. The developed method is illustrated on a simple numerical example. © IFAC.


Fodor A.,University of Pannonia | Magyar A.,University of Pannonia | Hangos K.M.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
2010 International Conference on Applied Electronics, AE 2010 | Year: 2010

A simple dynamic model of an industrial size synchronous generator operating in a nuclear power plant is developed in this paper based on first engineering principles. The constructed state-space model consists of a nonlinear state equation and a bi-linear output equation. It has been shown that the model is locally asymptotically stable with parameters obtained from the literature for a similar generator. The effect of load disturbances on the partially controlled generator has been analyzed by simulation using a traditional PI controller. It has been found that the controlled system is stable and can follow the set-point changes in the effective power well. The disturbance rejection of the controller is also satisfactory.


Fodor A.,University of Pannonia | Magyar A.,University of Pannonia | Hangos K.M.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
Electric Power Components and Systems | Year: 2014

A multiple-input-multiple-output linear-quadratic servo controller is proposed for a synchronous generator operating in a nuclear power plant that keeps the active power at the desired level and performs reactive power reference tracking using the reactive power demand from a central dispatch center. The controller design was based on the locally linearized version of a previous non-linear dynamical model of the synchronous electrical generator [1, 2], the parameters of which have been identified using measured data from Paks Nuclear Power Plant (Hungary). The method can easily be applied to any industrial power plant generator connected to the electrical grid after estimating its parameters. The proposed observer-based multiple-input-multiple-output state feedback controller is a linear-quadratic servo controller with very good reference tracking and disturbance rejection properties, which were confirmed by simulation experiments. © 2014 Copyright © Taylor & Francis Group, LLC.


Fodor A.,University of Pannonia | Magyar A.,University of Pannonia | Hangos K.M.,University of Pannonia | Hangos K.M.,Computer and Automation Research Institute HAS
Energy | Year: 2012

Nuclear Power Plant (Hungary) is developed in this paper based on first engineering principles that is able to describe the time-varying active and reactive power output of the generator. These generators are required to take part in the reactive power support of the power grid following the demand of a central dispatch center, and also contribute to the frequency control of the grid. The developed model has been verified under the usual controlled operating conditions when the frequency and the active power are controlled. Static and dynamic sensitivity analysis has been applied to determine the model parameters to be estimated. The model parameters have been estimated applying the asynchronous parallel pattern search method using real measured data from the nuclear power plant. The confidence regions in the parameter space have been analyzed by investigating the geometry of the estimation error function. The developed model can serve as a basis for controlling the optimal energy production of the generator using both the active and reactive power components. © 2012 Elsevier Ltd.


Bokor J.,Computer and Automation Research Institute HAS | Keviczky L.,Computer and Automation Research Institute HAS | Banyasz C.,Computer and Automation Research Institute HAS
European Control Conference, ECC 1999 - Conference Proceedings | Year: 2015

This paper investigates the joint, possible iterative identification and control problem with emphasis on the use of a generic scheme proposed by Keviczky and Bányász. The relationship to the identification of the free parameter in the dual Youla parametrization is shown and the iterative design using l2 and H criteria are outlined. © 1999 EUCA.


Hangos K.M.,Computer and Automation Research Institute HAS | Szederkenyi G.,Computer and Automation Research Institute HAS
European Control Conference, ECC 1999 - Conference Proceedings | Year: 2015

The effect of the type and quality of process models applied for fault detection and isolation is investigated in this paper. It is shown that the level of details and the modelled processes within the applied grey box model determine the detectability of the faults as well as the sensitivity and detection delay of a particular fault detection method. The concepts and results are illustrated on the example of fault detection of heat exchange surface deterioration and leaking in a countercurrent heat exchanger. © 1999 EUCA.

Loading Computer and Automation Research Institute HAS collaborators
Loading Computer and Automation Research Institute HAS collaborators