Journal Volume 9 Issue 1

IEC Flickermeter used in Power System Monitoring

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Marcin Szlosek, Zbigniew Hanzelka, Andrzej Bień, Marek Hartman, Marek Rogoż

Part 1. Comparative Tests.

The test has been carried out for the flickermeters being designed according to the requirements and provisions of IEC 61000-4-15 standard. Objective of the test is the assessment of flickermeters suitability for measuring voltage fluctuations of various waveforms, occurring in power supply systems...

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Last Updated on Saturday, 06 September 2014 09:12

IEC Flickermeter used in the Power System Monitoring

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Marek Rogoż, Andrzej Bień, Zbigniew Hanzelka, Marcin Szlosek, Marek Hartman

Part 2: Investigation of the fickermeter model sensivity

Flickermeters users have noticed that despite of positive test results (acc. to standard [2]) the instruments' readings can still disagree significantly. One of the crucial problems in the flickermeter design is permissible tolerance of the components used. It is difficult to predict cumulative effects of the components parameters dispersion...

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Last Updated on Saturday, 06 September 2014 09:14

Analysis of Modified Diode Bridge Rectifier with Improved Power Factor

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Grzegorz Radomski

The subject of this paper is theoretical and simulation investigation of modified diode rectifier with improved power factor assembled according to proposition presented in [1]. The modified diode rectifier with additional power electronic valves used for modeling of multilevel voltage at the input of the diode rectifier is analysed...

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Last Updated on Saturday, 06 September 2014 09:15

Experimental Investigations of Modified Diode Rectifier with Improved Power Factor

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Grzegorz Radomski

The importance of electrical power quality arises from the economical reasons. The electrical power quality is expressed by the set of coefficients like the total harmonic distortion, the total power factor, the power displacement factor. The normalised valuesof these factors are very demanding...

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Last Updated on Saturday, 06 September 2014 09:16

Methods of Determination of the Voltage Fluctuations and Light Flicker at Simultaneous Operation of Three-phase Arc Furnaces

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Zbigniew Olczykowski

In this paper different method of determination of range of voltage fluctuations and light flicker at parallel work of three-phase arc devices have been presented. The method using quasi-static power-voltage characteristics of the arc device has been thoroughly discussed. This method also takes into account...

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Last Updated on Saturday, 06 September 2014 09:17

A Novel Reccurent Approach to the Output Voltage Filtering of the Inverter

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Jan Iwaszkiewicz

The paper presents a novel proposal permitting to improve output voltage waveforms of the convertor. The main idea is based on the assumption that the total convertor output space vector is selected as a composition of space vectors generated by three two-level inverters. The total convertor is built...

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Last Updated on Saturday, 06 September 2014 09:18

Problems of Development Planning of Electric Power Networsk of Different Voltages with regard of Dispersed Generation and Commercialisation of Polish Power Industry

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Jerzy Niebrzydowski, Lucjan Twardy

The paper considers new problems that have arisen in the process of transmission and distribution networks development planning in circumstances of power generation commercialisation and distributed generation. The topic situation and ways to tackle the new problems in development planning in both...

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Last Updated on Saturday, 06 September 2014 09:19

Surface Effects Impact on Conductor Impedance

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Pavel Novák, Pavol Babarik, Jozef Janoščik

This article presents possibilities of practical application of numerical elementary conductors method for investigation of surface effects. Their influence on elements of conductor impedance result from of intensive electromagnetic fields action in the conductor surroundings. The method particuralry applies to...

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Last Updated on Saturday, 06 September 2014 09:23

Characterizing Digital Energy Use

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Marek Samotyj, Tom Key, Bill Howe

The impact of digital technologies on modern society is profound and growing, with broad influence on economic growth, energy efficiency and productivity. There is a clear economic and national security imperative for the U.S. and other nations to understand the role that new digital technologies play in modern society...

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Last Updated on Saturday, 06 September 2014 09:25

New Method of Short-circuit Current Limiting

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Pawel Hempowicz

A new method of short-circuit current limiting in AC  power systems and an inductive short-circuit current limiter realizing the method has been presented in the paper. The inductive short-circuit current limiter operation depends on the fact that at the instant of a short-circuit beginning the limiter switches automatically...

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Last Updated on Saturday, 06 September 2014 09:25

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