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Methodology of calculating electric energy losses in distribution networks for the needs of assessment of operation effectiveness of distribution companies

Methodology of calculating electric energy losses in distrib...

引用

International Conference on Electrical Power Quality and Utilisation (EPQU)

作者： Barbara Kaszowska Andrzej Wloczyk Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland

Calculation of the energy losses is a very important problem for the distribution networks exploitation. The paper presents the linear model of the LV distribution network for the energy losses calculation. The comparison of calculation results for different ways of agregation of energy losses magnitudes are presented in the paper.

关键词： Energy loss Dielectric losses Batteries automatic control computer science Energy measurement Fluid flow measurement Loss measurement Tin Information resources

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Empirical analysis of the effect of parasitics and of reverse recovery as an amplitude error on distortion in a class D audio amplifier

Empirical analysis of the effect of parasitics and of revers...

引用

AFRICON Conference

作者： F. Koeslag H. du T. Mouton H.J. Beukes Faculty of Industrial and Mechanical Eng. Electronics Laboratory University of Oulu FINLAND Faculty of Electrical IT and Computer Eng. Islamic Azad University Qazvin Iran Department of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

An analysis of the effect of parasitics and reverse recovery on harmonic distortion in a class D audio amplifier is performed in this paper. The error sources under investigation are modelled empirically as an amplitude error, after which an existing strategy based on Newton's numerical method is implemented to simulate its effect within the audible band. The results are compared to existing timing errors to determine its degree of dominance.

关键词： Inductors Performance analysis Harmonic distortion MOSFET circuits Power semiconductor switches Frequency Voltage control Harmonic analysis Timing Total harmonic distortion

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Droop based control of parallel-connected single-phase inverters in D-Q rotating frame

Droop based control of parallel-connected single-phase inver...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： Saeed Golestan Mahmood Joorabian Hasan Rastegar Arman Roshan Josep M. Guerrero Faculty of Electrical Engineering Amirkabir University of Technology슠 Tehran Iran Shahid Chamran University Ahvaz Iran Center of Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Automatic Control Systems Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424435067

In this paper, control of parallel single-phase inverters in direct-quadrature(DQ) rotating frame based on droop method is proposed. For each inverter, a secondary orthogonal imaginary circuit is created to provide the second phase required for the transformation; thus a DQ model of the inverter is obtained. The DQ transformation provides a time-invariant model of the inverter which makes the control design similar to that of dc-dc converters. The recognition of this analogy is important in that all of advanced dc-dc converters control techniques that have been previously developed can be applied to the control parallel inverters. The controller then is designed in DQ frame. Theoretically, infinite loop gain can be achieved in DQ rotating frame resulting in the elimination of the steady state error at the fundamental frequency of the inverter. The output impedance of the inverters is also considered, to ensure the decoupling between active and reactive power control using droop method. Simulation results are provided to prove the concept.

关键词： Inverters Communication system control Circuits DC-DC power converters Uninterruptible power systems Power system reliability control systems control design Frequency Reactive power control

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D-partition technique and mathematica applied to stabilize non-minimum phase dead time processes

D-partition technique and mathematica applied to stabilize n...

引用

27th IASTED International Conference on Modelling, Identification, and control

作者： Calistru, Catalin Nicolae Gheorghe Asachi Technical University of Iasi Faculty of Automatic Control and Computer Engineering Mangeron 53A 700050 Iasi Romania

ISBN: (纸本)9780889867116

This paper considers the problem of stabilizing of unstable dead time processes using D-partition technique. This technique is suitable to find the maximum stability domain in the 3D domain of a PID controller parameters, k R, kI, kD. In this paper analytical expressions are derived in order to describe both stability domain boundaries but moreover to investigate the effect of time delay on the stabilizability of the process. Illustrative examples are detailed by simulation over Mathematica software.

关键词： Three term control systems

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Static electrification properties of hexane and cyclohexane mixtures

Static electrification properties of hexane and cyclohexane ...

引用

2008 IEEE International Conference on Dielectric Liquids, ICDL 2008

作者： Zdanowski, M. Opole University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Electrical Power Engineering Prószkowska 76 B2 45-748 Opole Poland

ISBN: (纸本)1424415853

The paper presents research results on ECT (Electrostatic Charge Tendency) of cyclohexane and hexane mixtures, that is dielectric liquids of a simple chemical structure and high purity (Pro analysi). The research tests are carried out in a spinning disk system, where the factors affecting the value of the electrification current registered are a varying composition of the mixture and the rotational speed of the disk. In the next stage physicochemical parameters are measured in order to determine the relationship between the properties of the mixtures under study and the electrification current generated. The research results show that the ECT of the mixture depends, to a large extent, on the proper selection of particular components.

关键词： Mixtures

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Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

引用

20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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The influence of the Cole-Cole model coefficients on the parameters of the recovery voltage phenomena of paper-oil insulation

The influence of the Cole-Cole model coefficients on the par...

引用

2008 IEEE International Conference on Dielectric Liquids, ICDL 2008

作者： Wolny, S. Zdanowski, M. Opole University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Department of Electrical Power Engineering Prószkowska 76 B2 45-748 Opole Poland

ISBN: (纸本)1424415853

The paper presents the application of the Cole-Cole model for determining the runs of the return voltage of the paper-oil insulation sample through a computer simulation. Different insulation conditions were simulated through an adequate selection of parameters α and τ of the Cole-Cole model. For calculation purposes, a series - parallel substitute scheme, obtained through approximation of a discrete characteristic operator impedance Za of the model applied, was used. The diagnostics of the simulated insulation condition was based on the analysis of a few selected parameters of the return voltage, obtained from time characteristics.

关键词： Insulation

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Time/logic variables used for digital hazard search

Time/logic variables used for digital hazard search

引用

Canadian Conference on Electrical and computer engineering (CCECE)

作者： Nicolae Galupa Faculty of Automatic Control and Computer Engineering TU Iasi Romania

The present work considers the problem of hazard in combinatorial logic structures. The start point is the classic time constants method. In order to improve it we shall consider the different transition times that characterize the ldquo0rdquouarrldquo1rdquo and ldquo1rdquodarrldquo0rdquo transitions for a logic gate. That will refine the methodpsilas precision. Furthermore in order to reduce the amount of calculus requested we shall define and use two time dependent logic variables (TDLV). The simplicity and precision of the improved method will be presented by aid of a real life example.

关键词： Hazards Propagation delay automatic logic units Logic gates Combinational circuits automatic control control engineering computing Calculus Signal analysis Delay effects

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The new numerical integration routine applied in sensorless drives

The new numerical integration routine applied in sensorless ...

引用

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

作者： Arkadiusz Gardecki Krystyna Macek-Kaminska Faculty of Electrical Engineering Automatic Control and Computer Science University of Technology Opole Poland

The paper presents a new numerical integration routine BGKODE_DSP. This routine is based on BGKODE routine, which forms a practical application of the Kroghpsilas algorithm. BGKODE_DSP routine realizes the predictor-corrector method and has been simplified to ensure its applicability in real time systems. The results of the comparison between the selected common numerical integration methods and the new routine is presented. The scope of this research also involves the range of accuracy of the solution resulting from the shorter computation time. Experiments have been carried out on experimental drive system with induction motor with the use of DTC method.

关键词： Differential equations Observers Artificial neural networks Accuracy Real time systems Mathematical model Torque

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Modeling and simulation of electromechanical systems by the use of the programming tools included in modern graphical packages

Modeling and simulation of electromechanical systems by the ...

引用

International Conference on Electrical Machines, ICEM

作者： Krystyna Macek-Kaminska Marcin Kaminski Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland

The aim of this paper is an attempt of the simulation of the electromechanical systems with the use of the programming tools included in the modern graphical packages or graphical extensions to the programming languages. The advantage of such approach lies in possibility of the simultaneous high quality visualization of the currently obtained results. The possibilities of new graphical packages enable making calculations on the Web platform - it is new and very interesting idea. The proposed solutions can be used both to the educational and presentation tasks.

关键词： Electromechanical systems Packaging Object oriented modeling Mathematical model Computational modeling Programming profession computer languages Operating systems Microcomputers computer graphics

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