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Pulse method measurements for determination of line fault location

Archives of Electrical Engineering 2006年第217-218期55卷 301-312页

作者： Tarczyński, WiesLaw Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change of wave impedance causing a change in reflection coefficient for pulses moving along the line. An exemplary analysis is performed for a homogenous lossless line at its starting and terminal points. The results of analysis are analytical expressions describing quantitative interactions of pulses. The expressions are verified both by computer simulation and by measurements of the real line. There has been performed the analysis of influence of the resistances with which the terminal points of the line are loaded onto the amplitude value of the pulses registered at the starting point of the line. The new method and the new system of measurements of pulses have been proposed that minimize the interaction of pulses at the starting point of the line, disadvantageous for the process of fault location by using pulse method.

关键词： Electric fault currents

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Determination of regulation characteristics of switched reluctance motors for quasi-optimal operation

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Archives of Electrical Engineering 2006年第217-218期55卷 313-324页

作者： Tomczewski, Krzysztof Wach, Piotr Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, because the regulation characteristics depend on three variables: phase voltage, switch-on and switch-off angles. For this reason in a steady state the same operation point (Tl, ω) of the mechanical characteristic is attainable for quite different values of those control parameters. So there is a field for quasi-optimal operation and the choice of the coresponding control parameters is the main subject of this work. The paper presents also the method to determine these quasi-optimal control characteristics from simple tests or from computations based on presented simple mathematical model.

关键词： Reluctance motors

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Constrained Ant Colony Optimization for data clustering

Constrained Ant Colony Optimization for data clustering

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8th Pacific Rim International Conference on Artificial Intelligence, PRICAI 2004: Trends in Artificial Intelligence

作者： Chu, Shu-Chuan Roddick, John F. Su, Che-Jen Pan, Jeng-Shyang School of Informatics and Engineering Flinders University of South Australia GPO Box 2100 Adelaide SA 5001 Australia Department of Electronic Engineering Kaohsiung University of Applied Sciences Kaohsiung Taiwan National Kaohsiung Marine University Kaohsiung Taiwan Department of Automatic Test and Control Harbine Institute of Technology Harbine China

ISBN: (纸本)3540228179

Processes that simulate natural phenomena have successfully been applied to a number of problems for which no simple mathematical solution is known or is practicable. Such meta-heuristic algorithms include genetic algorithms, particle swarm optimization and ant colony systems and have received increasing attention in recent years. This paper extends ant colony systems and discusses a novel data clustering process using Constrained Ant Colony Optimization (CACO). The CACO algorithm extends the Ant Colony Optimization algorithm by accommodating a quadratic distance metric, the Sum of K Nearest Neighbor Distances (SKNND) metric, constrained addition of pheromone and a shrinking range strategy to improve data clustering. We show that the CACO algorithm can resolve the problems of clusters with arbitrary shapes, clusters with outliers and bridges between clusters. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Optimization

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Hadamard transform based equal-average equal-variance equal-norm nearest neighbor codeword search algorithm

Hadamard transform based equal-average equal-variance equal-...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Shu-Chuan Chu J.F. Roddick Zhe-Ming Lu Jeng-Shyang Pan School of Informatics and Engineering Flinders University Adelaide Australia Department of Automatic Test and Control Harbin Institute of Technology Harbin China Department of Electronic Engineering University of Kaohsiung Kaohsiung Taiwan

The paper presents a novel, efficient, nearest-neighbor codeword search algorithm based on three elimination criteria in the Hadamard transform (HT) domain. Before the search process, all codewords in the codebook are Hadamard-transformed and sorted in the ascending order of their first elements. During the search process, we first perform the HT on the input vector and calculate its variance and norm, and secondly exploit three efficient elimination criteria to find the nearest codeword to the input vector using the up-down search mechanism near the initial best-match codeword. Experimental results demonstrate that the performance of the proposed algorithm is much better than that of most existing nearest neighbor codeword search algorithms, especially in the case of high dimension

关键词： Error correction Error correction codes Nearest neighbor searches Image coding Equations Wavelet transforms Code standards Electronic equipment testing automatic testing automatic control

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A fuzzy adaptive request distribution algorithm for cluster-based Web systems

A fuzzy adaptive request distribution algorithm for cluster-...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： L. Borzemski K. Zatwarnicki Institute of Control and Systems Engineering Wroclaw University of Technology Wroclaw Poland Department of Electrical Engineering and Automatic Control Technical University of Opole Opole Poland

This paper presents a novel algorithm for distribution of user requests sent to a Web-server cluster driven by a Web switch. Our algorithm called FARD (fuzzy adaptive request distribution) is a client-and-server-aware, dynamic and adaptive dispatching policy. It assigns each incoming request to the server with the least expected response time, estimated for that individual request. To estimate the expected response times FARD uses the fuzzy estimation mechanism. With respect to the requirement of modifiability of the model, FARD uses a neural network provided with innate abilities for learning and adaptation. We implemented a prototype FARD-based Web switch that was used in experiments carried out to compare its performance to well known representative request distribution algorithms. The measurements show that FARD benefits can be significant, especially for heterogeneous Web clusters.

关键词： Fuzzy systems Clustering algorithms Switches Delay Dispatching Internet Web server Network servers automatic control Neural networks

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Parallel Ant Colony systems 14th

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14th International Symposium on Methodologies for Intelligent Systems, ISMIS 2003

作者： Chu, Shu-Chuan Roddick, John F. Pan, Jeng-Shyang Su, Che-Jen School of Informatics and Engineering Flinders University of South Australia GPO Box 2100 AdelaideSA5001 Australia Department of Electronic Engineering Kaohsiung University of Applied Sciences Kaohsiung Taiwan Department of Automatic Test and Control Harbine Institute of Technology Harbine China

ISBN: (纸本)3540202560

In this paper a Parallel Ant Colony System (PACS) is developed. Three communication methods for updating the pheromone level between groups in PACS are proposed and work on the traveling salesman problem using our system is presented. Experimental results based on three well-known traveling salesman data sets demonstrate the proposed PACS is superior to the existing Ant Colony System (ACS) and Ant System (AS) with similar or better running times. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Traveling salesman problem

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Characterisation of high-speed multiconductor interconnections

Characterisation of high-speed multiconductor interconnectio...

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作者： Znamirowski, L. Palusinski, O.A. Silesian University of Technology Department of Automatic Control Electronics and Informatics Gliwice Poland University of Arizona Department of Electrical and Computer Engineering Tucson AZ United States

The paper presents a method for the determination of the capacitance matrix needed in modelling and simulation of signal transmission in multiple coupled interconnecting lines. The method utilises capacitance measurements and thus one of its useful application areas is in the validation of numerous previously published algorithms based on various approximations to field equations, originally developed for the computation of capacitance matrices. The technique described is based on the active separation of the capacitance network, achieved through the use of a unity-gain amplifier. Thanks to the circuit configurations introduced with a unity-gain amplifier it is possible to make direct capacitance measurements in the multiconductor interconnecting structures. Measurement procedures are described and analysis of errors in measured quantities caused by the imperfections of measuring equipment is discussed. A sample of results obtained in measuring manufactured test structures is included for illustration of the method and measuring procedures.

关键词： Interconnection networks

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control zeros and nonminimum phase LTI MIMO systems

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IFAC Proceedings Volumes 1999年第2期32卷 1967-1974页

作者： Krzysztof Latawiec Stanisław Bańka Jerzy Tokarzewski Department of Electrical Engineering and Automatic Control Technical University of Opole Opole Poland Institute of Control Engineering Technical University of Szczecin Szczecin Poland Institute of Mechanical Vehicles Military University of Technology Warszawa Poland fax:(+48-22)6854802

The paper presents a new, general, inverse-model/output-zeroing approach to zeros of LTI discrete-time multivariable, possibly nonsquare systems. It is shown on simple examples that the existing definitions of multivariable zeros fail to detect certain important zeros which contribute to zeroing the system output. As a result, a concept of 'control zeros' is introduced, followed by a general redefinition of minimum/nonminimum phase systems, both new contributions being based on the notion of (generalized) inverse systems. Output-zeroing/inversemodel/minimum-variance control-related justifications of the new approach are presented.

关键词： Multivariable systems multivariable control zero sets nonminimum phase systems inverse system

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A multivariable laboratory process with an adjustable zero

A multivariable laboratory process with an adjustable zero

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1998 American control Conference, ACC 1998

作者： Johansson, Karl Henrik Nunes, José Luís Rocha Department of Automatic Control Lund Institute of Technology Box 118 S-221 00 Lund Sweden Department of Informatics University of Coimbra Coimbra Portugal

ISBN: (纸本)0780345304

A novel multivariable laboratory process that consists of four interconnected water tanks is presented. The linearized dynamics of the system have a multivariable zero that is possible to move along the real axis by changing a valve. The zero can be placed in both the left and the right half-plane. In this way the quadruple-tank process is ideal for illustrating many concepts in multivariable control, particularly performance limitations due to multivariable right half-plane zeros. Accurate models are derived from both physical and experimental data and multi-loop control is illustrated. © 1998 AACC.

关键词： Water tanks

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A multivariable laboratory process with an adjustable zero

A multivariable laboratory process with an adjustable zero

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American control Conference (ACC)

作者： K.H. Johansson J.L.R. Nunes Department of Automatic Control Lund Institute of Technology Coimbra Portugal Department of Informatics University of Coimbra Portugal

关键词： Laboratories Valves Industrial control automatic control Voltage Mathematical model informatics Mechanical systems Helicopters Magnetic levitation

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