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Optimal control over unreliable networks with uncertain loss rates

Optimal control over unreliable networks with uncertain loss...

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作者： Kögel, Markus J. Blind, Rainer Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany Laboratory for Systems Theory and Automatic Control Institute for Automation Engineering Otto-von-Guericke University Magdeburg Magdeburg Germany Design and Optimization in Chemical and Biochemical Process Engineering International Max Planck Research School for Analysis Magdeburg Germany

ISBN: (纸本)9781424474264

In this work, we consider an optimal control problem for Networked control systems (NCS), where the loop is closed via an unreliable network. In order to inform the controller about the fates of the control packets, the actuator sends acknowledgements to the controller. In this work, different types of acknowledgements are considered. Since all packets are send over a network, we consequently assume, that all packets can get lost, i.e. the measurement packets, the control packets as well as the acknowledgement packets. The loss of these packets is modeled by independent and identically distributed (iid) Bernoulli processes. Finally, we assume that the parameters of these loss processes are not known exactly. Using this setup, we derive bounds for the uncertainty in the loss rates. Moreover, we present an algorithm to design a sub-optimal controller which can tolerate a given amount of network uncertainties. © 2010 AACC.

关键词： Networked control systems

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THD reduction with grid synchronized inverter’s power injection of renewable sources

THD reduction with grid synchronized inverter’s power injec...

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International Symposium on Power Electronics, Electrical Drives, automation and Motion, SPEEDAM

作者： Péter Görbe Attila Magyar Katalin M. Hangos Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary Process Control Research Group Computer and Automation Research Institute Budapest Hungary

A control method for small domestic power plants using renewable energy is described in this paper. This method is not only capable of optimizing the working point of the plant but also implements active power factor correction and lowers the extant harmonic distortion in the line. The novel element in the proposed complex controller structure is the upper harmonic controller that minimizes the amplitudes of the 3rd, 5th 7th, 9th, and the 11th upper harmonic component in the output voltage. The proposed controller has been investigated by simulation in Matlab environment, and as a result, substantial improvement of the output voltage and current waveform could be achieved. Robustness of the method against nonlinear loads has also been tested.

关键词： Power factor correction Costs Power generation Voltage control Harmonic distortion Robustness Nonlinear distortion Solar power generation Power supplies Inverters

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Dynamic modeling and model analysis of a large industrial synchronous generator

Dynamic modeling and model analysis of a large industrial sy...

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International Conference on Applied Electronics, AE

作者： Attila Fodor Attila Magyar Katalin M. Hangos Department of Electrical Engineering and Information Systems University of Pannonia Veszprem Hungary Process Control Research Group Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

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.

关键词： Mathematical model Equations Synchronous generators Torque Windings Rotors

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Hybrid Intelligent control for a Closed-Circuit Grinding process

Hybrid Intelligent Control for a Closed-Circuit Grinding Pro...

引用

2010 49th IEEE Conference on Decision and control

作者： Da-yong Zhao Tian-you Chai Jun Fu Hong Wang Key Laboratory of Integrated Automation of Process Industry (Northeastern University) Ministry of Education and Research Center of Automation Northeastern University Shenyang China Control Systems Centre the University of Manchester Manchester M60 1QD UK

ISBN: (纸本)9781424477456

In this paper, a hybrid intelligent control method for a closed-circuit grinding process (CCGP) is developed to stabilize the grinding process in mineral processing and replace the manual operation. This method integrates a cascade averaging controller (CAC), an abnormal sump level controller using rule based reasoning (RBR), a switching controller for the slurry pump speed and a feeding concentration controller of the hydroclone into one efficient control module. The hybrid intelligent control system has been built and implemented in a concentration plant in China. The industrial applications show the validity and effectiveness of the proposed method.

关键词： control module Intelligent control controllers slurry pumps intelligent control system level controller switching controller

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Application of GA based neuro - fuzzy automatic generation for teleoperation systems

Application of GA based neuro - fuzzy automatic generation f...

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International Conference on Digital Content, Multimedia Technology and its Applications (IDC)

作者： Sara Manifar Mahdi Aliyari Shoorhedeli Department of Mechatronics Engineering Islamic Azad University Science and Research Tehran Iran Department of Mechatronics Engineering and Advanced Process Automation and Control (APAC) Research Group K.N. Toosi University of Technology Tehran Iran

This paper discusses the design of a controller for teleoperation systems which operate in contact with unknown environments. For this purpose, the controller in the slave part is designed to use a classical controller and a neuro-fuzzy controller. To have a haptic teleoperation, the force feedback from the contact point to the master side is needed. In this study virtual force is fed back to the master instead of the measured contact force and the feedback force is the position error i.e. the difference between the position of master and slave robots. Primary, classical controller was designed for this object, the gains of this controller is obtained by standard genetic algorithm (GA), in offline and optimization method at nominal operating point. In master-slave robot with classical controller, when, robot works in soft or hard environment and the operating point was changed, the obtained controller are not suitable. For this reason, online neuro - fuzzy gain scheduling controller are designed for this system to tune the controller's parameters. The NF trained in offline mode based on GA and in online application tuned the controller based on monitoring of operating point of system. This method makes the system robust to uncertainties such as modeling errors, parameter mismatches and disturbances. The simulation results show the ability of proposed method in compare of other controllers such as Kalman filter.

关键词： Force Equations Monitoring Iron Mathematical model

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Identifiability study of a pressurizer in a pressurized water nuclear power plant 10

Identifiability study of a pressurizer in a pressurized wate...

引用

2009 10th European control Conference, ECC 2009

作者： Szederkenyi, Gabor Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary

ISBN: (纸本)9783952417393

In this paper, the identifiability of a pressurizer model is investigated. The modeled physical system is located in the primary circuit of a pressurized water nuclear power plant. A simple first principle model for the pressurizer is used for the calculations and it is shown that both the appropriately transformed and the original physical model parameters are structurally identifiable. © 2009 EUCA.

关键词： Nuclear power plants

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Modeling and identification of a Nuclear reactor with temperature dependent reactivity 10

Modeling and identification of a Nuclear reactor with temper...

引用

2009 10th European control Conference, ECC 2009

作者： Fazekas, Csaba Gabor, Attila Hangos, Katalin M. Process Control Research Group Computer and Automation Research Institute Budapest Hungary

ISBN: (纸本)9783952417393

A simple dynamic model of a nuclear reactor with temperature dependent reactivity and six groups of neutron emitting nuclei is developed in this paper based on first engineering principles. The proposed model contains the possible minimal number of differential equations and it is capable of describing important dynamic phenomena such as load change transients between day and night periods. Because the model is nonlinear in its parameters, an optimization-based parameter estimation procedure has been applied by using the Nelder-Mead algorithm and measured data from the Paks Nuclear Power Plant. The estimated parameter values fall into physically meaningful ranges and the response of the constructed reactor model shows a good fit to the measurement data. © 2009 EUCA.

关键词： Differential equations

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Robust control design of multiple resonant controllers for sinusoidal tracking and harmonic rejection in uninterruptible power supplies

Robust control design of multiple resonant controllers for s...

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IEEE International Symposium on Industrial Electronics

作者： Bonan, Guilherme Mano, Otávio Pereira, Luis Fernando Alves Coutinho, Daniel Ferreira Department of Research and Development CP Eletrônica S.A. Rua da Várzea 379 91040-600 Porto Alegre-RS Brazil Department of Electrical Engineering Universidade Federal do Rio Grande do Sul - UFRGS Av. Osvaldo Aranha 103 90035-190 Porto Alegre-RS Brazil Group of Automation and Control Systems Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS Av. Ipiranga 6681 90619-900 Porto Alegre-RS Brazil

ISBN: (纸本)9781424463916

This paper presents a robust control strategy for tracking sinusoidal reference signals with zero steady state error and harmonic compensation in Uninterruptible Power Supplies - UPS. Multiple resonant controllers are derived for DC-AC inverters when supplying energy to (uncertain) nonlinear loads to obtain a nice tradeoff between transient response and disturbance rejection regardless possible load variations. The controller parameters are determined by means of a convex optimization problem subject to a set of linear matrix inequalities (LMIs). Real time experiments demonstrate the potentials of the proposed approach for controlling UPS systems. © 2010 IEEE.

关键词： controllers

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Tension Soft Sensor of Continuous Annealing Lines Using Cascade Frequency Domain Observer with Combined PCA and Neural Networks Error Compensation

Tension Soft Sensor of Continuous Annealing Lines Using Casc...

引用

2010 49th IEEE Conference on Decision and control

作者： Qiang Liu Tianyou Chai Hong Wang S. Joe Qin Key Laboratory of Integrated Automation of Process Industry (Northeastern University) Ministry of Education and Research Center of Automation Northeastern University Shenyang China Control Systems Centre the University of Manchester Manchester M60 1QD the United Kingdom Mork Family Department of Chemical Engineering and Materials Science the Ming Hsieh Department of Electrical Engineering University of Southern California Los Angeles CA 90089-1211 USA

ISBN: (纸本)9781424477456

In continuous annealing processes, strip tension is an important factor which indicates whether the annealing line works steadily. The strip tension detection in the continuous annealing process, therefore, is essential for the reliable and stable operation of the units, and will help to improve the quality of strip products. However, in real annealing processes, only a limited number of strip tensions can be measured. Since installing tension sensors everywhere will be unrealistic and expensive, in this paper a cascade reduced-order observer method with principal component analysis (PCA) and neural networks (NN) compensation is proposed to estimate the unknown tensions between each two neighboring rolls so as to monitor the tension profile for the whole line. When the main observer model is established, the influences of strip inertia and roll eccentricity on tensions are taken into account for better estimation. Moreover, when the error compensation is designed, PCA scores are used as the inputs to the NN. The application results show the effectiveness of the proposed method, with the estimated tensions used for the analysis of the strip-breaks fault.

关键词： Error compensation Continuous annealing annealing tension strip tension stability operations Neural network cascades

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Dynamical modeling and identification of a GnRH neuron

Dynamical modeling and identification of a GnRH neuron

引用

作者： Csercsik, Dávid Szederkényi, Gábor Hangos, Katalin M. Farkas, Imre Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary Department of Endocrine Neurobiology Institute of Experimental Medicine HAS Budapest Hungary

ISBN: (纸本)9783902661494

GnRH neurons, as key elements of the reproductive neuroendocrine system, have important central regulating role in the dynamics of the hormonal cycle. A Hodgkin-Huxley type neural model is proposed in this paper, that takes into account up-to-date biological literature data related to ion channels. The proposed neuron model is highly nonlinear in parameters and the evaluation of the objective function is computationally flexpensive, therefore the asynchronous parallel pattern search (APPS) procedure has been used for identification. The model with high number of estimated parameters provides a qualitatively good fit of both voltage clamp and current clamp traces. © 2009 IFAC.

关键词： Neurons

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