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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Peter Stumpf Rafael. K. Jardan Istvan Nagy Zoltan Varga Economics Department of Automation and Applied Informatics Budapest Budapest University of Technology Hungary MTA-BME Control Engineering Research Group Budapest

Wind Energy Conversion Systems (WECS) are penetrating into Microgrids as they fit well to the concept of Distributed Generation. The variable speed Doubly Fed Induction Generators (DFIG) are most frequently used. Changing the speed (DFIG) according to the aerodynamic law, maximum wind power can be harvested. The paper investigates the way of speed change by rotor voltage in steady-state and in transient. Steady state characteristics and simulation results for dynamic behavior are included.

关键词： Rotors Stators Generators Microgrids Wind turbines Wind energy Wind power generation

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Improving dynamics of vector controlled IM drive by resampling SVM under low frequency ratio

Improving dynamics of vector controlled IM drive by resampli...

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International Conference on Electrical Machines, ICEM

作者： Péter Stumpf Rafael K. Járdán István Nagy István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics MTA-BME Control Engineering Research Group Budapest Hungary

ISBN: (纸本)9781479943883

Field Oriented Control (FOC) technique is one of the most frequently applied algorithm to control the torque and the speed of a three-phase electric drive. The paper focuses on high speed or high-pole count motor FOC drives when both the sampling over reference frequency ratio F and the carrier over reference frequency m f is low. The paper presents that the stability range of a speed sensor-less FOC motor drive can be extended by recalculating the reference signal of the Space Vector Modulation algorithm at the negative peak of the carrier signal as well by approximating the rotor flux angle change over one half carrier period. The result was verified by computer simulations and laboratory measurements.

关键词： Support vector machines Resistors Torque Stators Current measurement Pulse width modulation Rotors

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Novel approach of microgrid control

Novel approach of microgrid control

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International Conference on Renewable Energy Research and Applications (ICRERA)

作者： Péter Stumpf István Nagy István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics MTA-BME Control Engineering Research Group Budapest Hungary

A novel microgrid control is proposed in the paper. Independent control of active and reactive power for each unit connected to the common microgrid bus is realized in addition to the power sharing in the designed ratio among the units. The concepts of voltage droop and frequency droop applied widely are incorporated here as well. The price paid for the independent control is the reference frame transformation needed in the novel control.

关键词： Microgrids Voltage control Vectors Reactive power Power conversion Renewable energy sources

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Comparison of two sampling techniques of SVM applied in sensorless Field Oriented Controlled IM drive

Comparison of two sampling techniques of SVM applied in sens...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Péter Stumpf Rafael K. Járdán István Nagy István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary MTA-BME Control Engineering Research Group Budapest Hungary

ISBN: (纸本)9781479924004

Field Oriented Control (FOC) technique is one of the mostly applied algorithm to control the speed and the flux of a three-phase electric drive. The paper focuses on high speed or high-pole count motor FOC drives when both the sampling over reference frequency ratio F and the carrier over reference frequency m f is low. The paper presents that the stability range of a speed sensor-less FOC motor drive can be extended by recalculating the reference signal of the Space Vector Modulation (SVM) algorithm at the negative peak of the carrier signal as well by approximating the rotor flux angle change over one half carrier period. The result was verified by computer simulations and laboratory measurements.

关键词： Torque Support vector machines Current measurement Resistors Stators Pulse width modulation Torque measurement

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Comparative study of ultrahigh-speed induction generators with self-excitation

Comparative study of ultrahigh-speed induction generators wi...

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Mediterranean Conference on Control and automation (MED)

作者： R. K. Jardan Z. Varga I. Nagy Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary MTA-BME Control Engineering Research Group Budapest Hungary

ISBN: (纸本)9781479959020

In the paper a comparative analysis is carried out on seven different self-excitation methods that have been developed in the past decades taking into account the technical and economical features of the methods compared. A novel solution based on resonant circuit application is described in more detail, and the theoretical considerations have been confirmed by computer simulations and laboratory test results.

关键词： Reactive power Inductors Topology Stators Capacitance Switches

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Comparison of analytical and numerical models for anomalous diffusion in the Bloch-Torrey equation

Comparison of analytical and numerical models for anomalous ...

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International Conference on Fractional Differentiation and Its Applications (ICFDA)

作者： Richard L. Magin Viktor Kovacs Andrzej Hanyga Department of Bioengineering University of Illinois at Chicago Chicago IL USA Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Warszawa Poland

In this paper we use a numerical simulation to analyze the time evolution of the net spin magnetization in diffusion weighted MRI. We compare the integer and fractional cases by simulating the Bloch-Torrey equation for several different types of gradient pulses. This generalization of the diffusion process is based on the Continuous Time Random Walk (CTRW) model, where the order of the fractional time derivative a, and the order of the fractional space derivative β, encode the distributions of waiting time and jump length increments that underly anomalous dynamics in heterogeneous materials. We examine the time evolution of the net magnetization for a constant gradient field, for a pair of bipolar gradient pulses, for the Stejskal-Tanner pulse sequence, and for a set of oscillating gradients. We compare the numerical results with analytical expressions in particular cases, and present the overall system response for selected values of α and β. One novel observation is a slow recovery of magnetization in the case of non-integer fractional time derivatives, which seems to reflect the persistence (or memory) of the earlier states of magnetization that is encoded in the definition of the Caputo time-domain fractional derivative.

关键词： Magnetization Mathematical model Equations Magnetic resonance imaging Attenuation Numerical models Electronic mail

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The solution area and fitness-based algorithms of the content-driven template-based layout system

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WSEAS Transactions on Computers 2013年第5期12卷 218-232页

作者： Albert, István Charaf, Hassan Lengyel, László Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary

People use their mobile devices every day to access a wide variety digital content. The diversity of mobile platforms and that of mobile device capabilities requires providing automatic layout solutions for online content. For the purposes of this paper, our solutions focus on online magazines and newspapers. The Content-Driven Template-Based Layout System (CTLS) is a template-based online magazine layout approach. This approach facilitates in defining hierarchical layouts from basic layout elements and splitter components. The goal is to effectively calculate the resulting adaptation method for a particular layout element at any level of the layout hierarchy. This paper introduces both the solution area-based algorithm and the fitness-based algorithm of the CTLS approach. These algorithms apply inequalities rather than equations. Inequalities, represented by solution areas (polygons), provide the flexibility within the approach.

关键词： Digital devices

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FPGA-based real-time Hardware-In-the-Loop simulator of a mini solar power station

FPGA-based real-time Hardware-In-the-Loop simulator of a min...

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IEEE International Energy Conference and Exhibition (EnergyCon)

作者： T. Debreceni T. Kökényesi Z. Sötő I. Varjasi Siemens Zrt Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary Budapesti Muszaki es Gazdasagtudomanyi Egyetem Budapest HU

Nowadays as the technology is developing, the more complex the power electronics and its controls become, the more proper hardware tool is required for HIL (Hardware-In-the-Loop) simulation. The general aim of the presented work is developing a fast, reliable and scalable HIL simulation framework for the rapid prototyping of complex power electronic systems. There are at least three strong reasons for using HIL simulation during the development: i) reduction of development time, ii) safety and quality requirements, and iii) prevent costly and dangerous failures [1]. The subject of the paper is the development of such a real-time HIL simulator using an FPGA. The system to be modeled is a mini solar power station with energy storage, which means that it is a solar panels-fed battery charger power stage with the battery itself.

关键词： Integrated circuit modeling Field programmable gate arrays Batteries Mathematical model Digital signal processing Indexes Software packages

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Sensitivity analysis of the weighted generalized mean aggregation operator and its application to fuzzy signatures

Sensitivity analysis of the weighted generalized mean aggreg...

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2014 IEEE International Conference on Fuzzy Systems, FUZZ-IEEE 2014

作者： Harmati, István A. Bukovics, Ádám Kóczy, László T. Department of Mathematics and Computational Sciences Széchenyi István University Gyor Hungary Department of Structural and Geotech-nical Engineering Széchenyi István University Gyor Hungary Department of Automation Széchenyi István University Gyor Hungary Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9781479920723

In this paper we give bounds on the changing of the weighted generalized mean in terms of vector norms of the changing of the variables. Applying this result we characterize the sensitivity of fuzzy signatures which equipped with weighted generalized mean operators in their nodes. Finally, a practical example from civil engineering is also examined. © 2014 IEEE.

关键词： Sensitivity analysis

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Modeling integrated sustainable waste management systems using fuzzy cognitive maps and systems of systems concepts

Modeling integrated sustainable waste management systems usi...

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作者： Buruzs, A. Hatwágner, M.F. Kóczy, L.T. Department of Environmental Engineering Széchenyi István University Gyor Hungary Department of Informatics Széchenyi István University Gyor Hungary Department of Telecommunications and Media Informatics Budapest University of Technology Hungary Economics Hungary and Department of Automation Széchenyi István University Gyor Hungary

Movement towards more sustainable waste management practice has been identified as a priority in the whole of the EU. The EU Waste Management Strategy's requirements emphasizes waste prevention;recycling and reuse;and improving final disposal and monitoring. Integrated waste management systems can be defined as the selection and application of suitable and available techniques, technologies and management programs to achieve waste management objectives and goals. As a result of the complexity and uncertainty occurring in sustainable waste management systems, the fuzzy cognitive map method is used with the combination of the bacterial evolutionary algorithm to support the planning and decision making process of integrated systems. Since the fuzzy cognitive map method is formed for a selected system by determining the concepts and their relationships, it is possible to quantitatively simulate the system considering its parameters. Several techniques were used in order to produce the input data of the simulation process. The goal of this paper is to present the process of data production. © Civil-Comp Press, 2014.

关键词： Fuzzy Cognitive Maps

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