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Comprehensive optimization of brushless excitation of synchronous machine

Comprehensive optimization of brushless excitation of synchr...

引用

Annual Conference of Industrial Electronics Society

作者： K. Veszpremi Department of Electric Power Engineering Group of Electrical Machines and Drives Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Brushless excitation of wound rotor machines has an attractive property: the slip-rings can be omitted. Different methods are developed; this paper investigates the rotating transformer method, where the excitation machine is a wound rotor induction machine supplied by an excitation converter. The excitation circuit of the synchronous machine is connected to the three-phase rotor of the excitation machine through a diode bridge rectifier. One optimization is the proper selection of the power circuit for the excitation converter. The PWM AC chopper is proposed, providing almost sinusoidal supply for the excitation machine. In this case the operation of the system is essentially determined by the commutation of the rotating diode bridge. It has different working regions, which should be considered. A model is developed to investigate the characteristics of the steady-state operation. Optimization related to the utilization of the excitation machine is introduced and generalized, providing a complex design method for the components and the control of the system. The overall efficiency of the excitation system is also investigated and found to be slip-dependent.

关键词： Synchronous machines Wounds Diodes Bridge circuits Pulse width modulation Induction machines Rectifiers Choppers Commutation Power system modeling

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Small vector PWM strategies of three-level inverters

Small vector PWM strategies of three-level inverters

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： S. Halasz I. Varjasi Electric Power Engineering Department Budapest University of Technology and Economics Budapest Hungary Automation and Applied Informatics Department Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The PWM strategies that insure the lowest current and torque pulsations of three-level inverters are investigated for the voltage control region I in which only the small voltage vectors are used It is shown that these PWMs can he realized by two different methods. For both methods the carrier-based realizations are presented. The theoretical derivations of voltage spectra of these methods are derived and shown. The results were checked by a computer simulation; within this scope the voltage distribution between the two inverter input condensers was investigated too.

关键词： Pulse width modulation inverters Pulse width modulation Voltage control Power engineering and energy Automation Informatics Power generation economics Computer simulation Application software Torque

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Corner detection in digital images using fuzzy reasoning

Corner detection in digital images using fuzzy reasoning

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International Conference on Computational Cybernetics (ICCC)

作者： A. Rovid A.R. Varkonyi-Koczy M. da Grap Ruano Integrated Intelligent Systems-Japanese Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Measurement and Information Systems Integrated Intelligent Systems-Japanese Hungarian Laboratory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary University of Algarve Portugal

Corner detection plays an important role in computer vision as well as in 3D reconstruction of a scene. With the help of the corners we can determine the most characteristic points of an object and so reconstruct them. Corners are useful in case of pattern recognition, as well. In this paper a new corner detection scheme is introduced which is based on fuzzy reasoning and applies a special local structure matrix

关键词： Digital images Fuzzy reasoning Image reconstruction Layout Computer vision Detectors Intelligent systems Intelligent vehicles Laboratories Pattern recognition

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A novel approach to model TCP traffic

A novel approach to model TCP traffic

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Anh-Tuan Trinh S. Molnar High Speed Networks Laboratory Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper, a state-based modelling of TCP traffic is presented. During a connection, TCP stays in one of the following states: slow start, congestion avoidance, loss recovery (fast recovery and/or fast retransmit) and time out. We consider the states of a TCP connection as the phases of a stochastic process. We propose the use of the discrete-time batch Markovian arrival process (D-BMAP) to model the traffic generated by a TCP connection. The main contributions of the paper are the following. Firstly, we provide a simple unified model for some well-known versions of TCP based on the D-BMAP process. Secondly, we introduce a new concept, namely the TCP characterization matrix for a TCP connection that characterizes the transition probabilities between the states of TCP. This matrix is crucial in our state-based analysis. Thirdly, we present a technique to detect the states of TCP. We have developed our technique into a tool called TCP-ASD that automates state detection of a TCP connection. Our tool can automatically detect the beginning and the end of the states of TCP and thus the sojourn time distributions as well as other statistics that we use in our analysis. We also discuss the tradeoffs between simplicity and accuracy in the state-based approach. Finally, we use simulation and numerical analysis to validate our proposed model.

关键词： Traffic control Telecommunication traffic Informatics Stochastic processes Statistical distributions Probability Solid modeling High-speed networks Laboratories Electronic mail

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Peer-to-peer content sharing in wireless networks

Peer-to-peer content sharing in wireless networks

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： K. Marossy G. Csucs B. Bakos L. Farkas J.K. Nurminen Budapest University슠of슠Technology슠and슠Economics Hungary Nokia Research Center Budapest Hungary Nokia Research Center Helsinki Finland

A very efficient peer-to-peer application layer architecture is analyzed as a potential candidate for wireless peer-to-peer applications. Its performance in terms of generated traffic and load balance are simulated for different network sizes. A number of candidate cluster topologies are proposed. Based on the simulation results, the optimal cluster topology and cluster size are identified. We conclude that cluster sizes that are the square root of the number of nodes generate uniform traffic. The cluster topology should be star, ring or a compromise between the two, 'planned N'. We show that, for these topologies, the traffic increases less than linearly with the number of nodes in the network, making it highly scalable. Our conclusions are valid for uniform query and update distributions. In addition to the approach from earlier work (Csucs, G. et al., 2002), maintenance aspects are also dealt with; we briefly describe the basic link management procedures that make such networks feasible, but we do not cover their performance analysis. Neither do we treat query topologies.

关键词： Peer to peer computing Intelligent networks Wireless networks Telecommunication traffic Ground penetrating radar Network topology Traffic control Wireless application protocol Bandwidth Smart phones

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The influence of inverter control algorithm and DC link voltage on the inverter switching loss

The influence of inverter control algorithm and DC link volt...

引用

IEEE International Conference on Industrial technology (ICIT)

作者： A. Kovari I. Kadar S. Halasz Faculty of Electrical Engineering and Informatics Department of Electric Power Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The losses of an inverter-fed induction motor drive at a given load are depending on the material and construction of the machine, the converter topology and the characteristics of semiconductor power switches, the drive control system, the inverter control (modulation) algorithm and DC link voltage. Significant component of overall drive losses are the switching losses (which are proportional to the switching frequency) of voltage source inverters. Based on simulation results the switching losses of different inverter control methods were compared in steady state at various rotor speeds and two different DC link voltages. The hysteresis and the predictive current control, furthermore the carrier based space vector and two-phase PWMs were examined and simulated. It is shown that the carrier based PWM control produces lower switching losses than other investigated control, but for higher speed the predictive control has the smallest switching losses.

关键词： Voltage control Switching loss Pulse width modulation inverters Control systems Pulse width modulation Induction motor drives Building materials Semiconductor materials Modular construction Switching converters

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Stalled information based routing in multidomain multilayer networks

Stalled information based routing in multidomain multilayer ...

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NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： J. Szigeti J. Tapolcai T. Cinkler T. Henk G. Sallai High-Speed Networks Laboratory Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In multilayer (e.g. GMPLS/ASTN) networks the routing becomes very complex since it is performed over multiple network layers simultaneously. Furthermore, to achieve a certain level of QoS not only topology but also link-state information has to be spread. To obtain a path from a source to a desired destination in short time, source routing is preferred that relays upon link-state information that was flooded in advance. The often the flooding is performed the more up-to-date the state information is. Unfortunately, in case of larger networks this results in a heavy signaling load (overhead). To make such a routing scheme scalable either the flooding has to be rarefied or the network has to be split hierarchically into domains and appropriate intra-domain and inter-domain routing schemes have to be applied. In This work we propose a network model that performs topology aggregation to reduce the amount of information flooded as well as a routing scheme for these multilayer multidomain networks that works over that "simplified" network. Then we investigate the impact of stalled information (rare flooding) and impact of routing retrials onto the blocking ratio. The proposed framework is a viable solution for the control plane of future scalable transport networks like GMPLS/ASTN.

关键词： Routing Intelligent networks Nonhomogeneous media Telecommunication network topology Floods Proposals Optical fiber networks Optical sensors Telecommunication traffic High-speed networks

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On the approximation properties of TP model forms

On the approximation properties of TP model forms

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： D. Tikk P. Baranyi R.J. Patton Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Engineering University of Hull Hull UK

The tensor product (TP) based models have been applied widely in approximation theory and approximation techniques. Recently, a controller design framework working on dynamic systems has also been established based on TP model transformation combined with linear matrix inequalities (LMI) within parallel distributed compensation (PDC) framework. The effectiveness of the control design framework strongly depends on the approximation property of the TP model used. Therefore, the primary aim of this paper is to investigate the approximation capabilities of dynamic TP model. It is shown that the set of functions that can be approximated arbitrarily well by TP forms with bounded number of components lies no-where dense in the set of continuous functions. This drawback necessitates the application of trade-off techniques between accuracy and complexity of TP form. Such requirements are very difficult to consider in the analytical framework, but TP model transformation offers an easy way to deal with them.

关键词： Tensile stress Aerodynamics Control design Control system synthesis Approximation methods Spline Array signal processing Informatics Telecommunication control Linear matrix inequalities

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State correction after re-routing with reduced state resource reservation protocols

State correction after re-routing with reduced state resourc...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： A. Csaszar A. Takacs R. Szabo T. Henk Ericsson Research Hungary Traffic Laboratory Budapest Hungary HSNLab Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Recently, a new working group - Next Steps In Signalling (NSIS) - was established within the IETF to develop a general signalling protocol primarily to support QoS resource reservation. Two main operation modes have been clarified: stateful and reduced state. The first mode relies on per flow-state information in all interior nodes while the other uses aggregated states. Stateful operation is based on the resource reservation protocol (RSVP), while reduced state operation will be similar to the resource management in a Diffserv (RMD) framework. With the use of aggregated states instead of per-flow granularity, one looses fine control over resources but derives a scalable and more efficient protocol. However, some problems need new handling mechanisms. In this paper, we discuss the problem of re-routing from the aspect of reduced state resource reservation. We show how quickly and easily RSVP handles such situations but reduced state solutions like RMD require new mechanisms for a quick reaction. We propose and analyse several solutions.

关键词： Resource management Diffserv networks Bandwidth Routing protocols Telecommunication traffic Informatics Internet Transport protocols Streaming media Spine

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Efficient algorithms for physically-disjoint routing in survivable GMPLS/ASTN networks

Efficient algorithms for physically-disjoint routing in surv...

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NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： P. Laborczi T. Cinkler Arsenal Research GmbH Vienna Austria High Speed Networks Laboratory Department of Telecommunication and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

With the advent of intelligent multilayer networks, like GMPLS, connections can be protected against failures effectively; however, to capitalize the advantages, novel sophisticated routing methods are needed. This paper addresses the task of finding path-pairs in a Survivable multilayer network in order to ensure high availability for each connection. Known methods (like running a shortest path algorithm twice) either do not guarantee physical disjointness (SRLG constraints) or may not find solution even if it exists. Besides the integer linear program based approach that yields a solution with minimal total cost, we propose a heuristic method to solve the problem, and extend it to (1) minimize the number of spans used by both working and protection paths, (2) to find the weighted working path while ensuring the existence of a protection path, and (3) to find more than one backup paths for high priority traffic. It is shown with numerous simulations that our proposed method finds solution for significantly (up to 35%) more node pairs than traditional methods, while the running time is only slightly increased. Furthermore, it yields connection availabilities close to the optimum.

关键词： Routing Intelligent networks Wavelength division multiplexing Multiprotocol label switching Protection Electronic mail Nonhomogeneous media Costs Optical devices Telecommunication traffic

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