Temat: power quality - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Power Quality Enhancement Using DSTATCOM in Industry Plants
Autorzy:: Bayu, Atinkut
Tematy:: power quality
power quality problem
DSTATCOM
Matlab/Simulink; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1193908.pdf Link otwiera się w nowym oknie
Opis:: This paper is focused on increasing the power quality of Unique Macaroni factory, located in Bahir Dar Town. Necessary data have been collected from the factory and the collected data are analysed. Based on the analysis of data, it is found that the factory working power factor is low and hovering around 0.7125. Voltage variations are up to 9.09%, average voltage unbalance is 2.2% and total harmonic distortion (THD) of load currents and voltage are 24.17% and 10.16%, respectively. Harmonic components have existed in the power distribution system of the factory. Based on the analysis of power quality problem in the factory, distribution static compensator (DSTATCOM) and its control system have been designed to boost power quality of the factory and the results are obtained by generating simulations using Matlab software. It is observed from outputs of the Matlab simulations that DSTATCOM can improve the power quality of the factory. Generally, the shape of the waveform of load voltage and current is improved and THD level of load voltage is minimised to 1.55% and load current THD level is 7.09%. The reactive power needed by the loads (442 kVAr) is almost provided by the DSTATCOM, so reactive power from source supply is very small such as 22 kVAr so that the power factor of the source tends to unity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Control circuit for series active power filters based on programmable logic devices
Autorzy:: Supronowicz, H.
Olszewski, A.
Gawiński, H.
Tematy:: power electronics
active power filter
power quality; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262739.pdf Link otwiera się w nowym oknie
Opis:: This paper describes a control circuit for the active power filters working with three-phase AC power line. It describes logic circuitries as well as laboratory test results. The control circuit was realized with programmable logic devices, fast analog-to-digital and digital-to-analog converters. Proposed system working with open-loop control, it allows significantly simplifying its logic structure. Programmable logic devices do simultaneously a few independent tasks, so a control algorithm can be performing fast, improving considerably compensation dynamic. This paper includes results of laboratory tests of the active power filter consisted of proposed control circuit and a voltage-source converter.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An Assessment of Power Quality and Electricity Consumer’s Rights in Restructured Electricity Market in Turkey
Autorzy:: Gul, O.
Tematy:: consumer rights
power interruption
power quality
Turkey; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262663.pdf Link otwiera się w nowym oknie
Opis:: Recently, electricity consumers have shown increasing concern for power quality. Indeed, power quality standards have become higher than before for certain customers due to sensitivity of automation devices. In addition, power quality is affected by the deregulation of power markets in Turkey. In this study, the consumers are provided with the basic knowledge of power quality and the cost of the poor power quality while on the other hand, the existent regulations are evaluated in terms of consumers’ rights so that poor power quality costs and loss are identified and amended. There are so many regulations in relation to the rights of electrical power consumers in legislation that regulates the relations between distribution companies and the consumers, whereas, in this study, only the issue of power quality is dealt with.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Active power filters – optimization of sizing and placement
Autorzy:: Maciążek, M.
Grabowski, D.
Pasko, M.
Tematy:: power quality
active power filter
harmonics
optimization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200825.pdf Link otwiera się w nowym oknie
Opis:: The significant problem of compensator placement and sizing in electrical networks has been analyzed in the paper. The compensation is usually realized by means of passive or active power filters. The former solution is widely used mainly because of the economical reasons, but the latter one becomes more and more popular as the number of nonlinear loads increases. Regardless of the compensator type the most important goal consists in voltage and current distortion drop below levels imposed by standards. Nevertheless, the desired effects should be achieved with the minimum cost. So far a few objective functions have been proposed for this optimization problem. It is claimed that minimization of the compensator currents leads also to the minimum costs. This paper shows that such simplified approach could lead to suboptimal solutions and in fact a function g(·) reflecting the relation between the compensator size and its price must be incorporated into objective functions. Moreover, in this case it is very easy to compare solutions obtained using compensators offered by different suppliers - it is enough to change the function g(·). Theoretical considerations have been illustrated by an example of active power filter allocation and sizing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Sampled Method of Active Power Filter Control. Part II
Autorzy:: Szromba, A.
Tematy:: shunt active power filter
power factor
power quality; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262604.pdf Link otwiera się w nowym oknie
Opis:: The aim of the paper is to demonstrate how to use sampled method of control of a shunt active power filter to maintain invariable power of a supplying voltage source, even though the supplied load varies randomly. The definition by S. Fryze of load current components is used as a basis for the construction of a family of shunt active power filters. The distinctive property of these filters is maintaining non-deformed source current in every one individually considered period T. The main features of the family of filters are described in the first part of the paper, which is devoted to DC circuit. In the second part, the results are implemented to a single- and a three-phase circuit. Additionally, some new features, which may be applied only for AC circuit, are discussed in the second part. All the presented waveforms are obtained using computer simulation tools.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Sampled method of active power filter control. Part 1
Autorzy:: Szromba, A.
Tematy:: shunt active power filter
power factor
power quality; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262771.pdf Link otwiera się w nowym oknie
Opis:: The aim of the paper is to demonstrate how to use sampled method of control of a shunt active power filter to maintain invariable power of a supplying voltage source, even though the supplied load varies randomly. The definition by S. Fryze of load current components is used as a basis for the construction of a family of shunt active power filters. The under discussion family of filters is designed to work synchronically with a time period T. The period T may be regulated in some range. The distinctive property of these filters is maintaining non-deformed source current in every one individually considered period T. Main features of the family of filters are described in the first part of the paper, which is devoted to DC circuit. Then in the second part, the results, which are obtained in DC circuit, are implemented to a single- and then to a three-phase circuit. Additionally, some new features, which may be applied only for AC circuit, are discussed in the second part. All the presented waveforms are obtained using computer simulation tools.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Review of voltage fluctuation measures in power quality analyzers
Autorzy:: Wiczyński, G.
Tematy:: electrical energy
voltage
power quality; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/97690.pdf Link otwiera się w nowym oknie
Opis:: Similarly to a number of other quantities, those describing voltage variation make it possible to provide a complete assessment of the quality of electrical energy. Voltage variation may be described by measures used to assess the obnoxiousness of voltage fluctuations or measures that help indicate the source of fluctuations. The paper provides a comparison of the three most popular measures: the U_max maximum and U_min minimum rms voltage values, the P_st short-term flicker indicator, and voltage fluctuation indicators. The part that specifies the particular measures (including an additional description of the ∆V₁₀ indicator) also contains their short descriptions. The main part of the dissertation describes the dependence of the voltage fluctuation measures on the frequency of the f_m amplitude and frequency modulating signal. Observations drawn allow to specify the diagnostic capabilities of particular measures. Due to the complexity of voltage fluctuation measures’ studies the paper deals with only a certain aspect of it and should be concerned as a step to understanding the idea of voltage fluctuation measures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Measurements of Voltage Harmonics in 400 kV Transmission Network
Pomiary wyższych harmonicznych napięcia w sieci 400 kV
Autorzy:: Pawełek, R.
Wasiak, I.
Jurek, M.
Tematy:: voltage harmonics
power quality
power quality measurements
wyższe harmoniczne
jakość energii elektrycznej
pomiary jakości energii elektrycznej; Pokaż więcej
Wydawca:: ENERGA
Powiązania:: https://bibliotekanauki.pl/articles/397094.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with the analysis of voltage harmonics measurements performed in the 400 kV transmission network. The voltage was measured by means of three transducers: resistive voltage divider, inductive measuring transformer and capacitive voltage measuring transformer. Instrument errors were estimated for measuring transformers with reference to the harmonic values obtained from the voltage divider.
W artykule przedstawiono analizę wyników pomiarów wyższych harmonicznych napięcia, wykonanych w sieci przesyłowej 400 kV. Sygnały pomiarowe napięć uzyskano z trzech przetworników pomiarowych: rezystancyjnego dzielnika napięcia, napięciowego przekładnika indukcyjnego oraz napięciowego przekładnika pojemnościowego. Wyniki pomiarów z dzielnika rezystancyjnego przyjęto jako referencyjne, odnosząc do nich wyniki pomiarów uzyskane przy wykorzystaniu przekładników. Dokonano oszacowania błędów pomiarowych wyższych harmonicznych napięcia powodowanych przez przekładniki.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Measurement and Analysis of Harmonics and Interharmonics in Output Waveforms of Frequency Inverter. Part II
Autorzy:: Bartman, J.
Tematy:: interharmonics
inverter
power quality analyzer
measurements; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114230.pdf Link otwiera się w nowym oknie
Opis:: The paper discusses the measurement and analysis of the voltage and output power distortions of frequency inverter that supplies an induction motor. It covers basic information regarding frequency inverters and norms with definitions and descriptions of terms related to the measurement of harmonics and interharmonics. Moreover, it describes the problems that can occur while analyzing the signal when the inter-harmonics are present during the measurement. Exemplary results of measurements done with power quality analyzer in the laboratory have been presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Distributed System for Power Quality Improvement
Autorzy:: Klempka, R.
Tematy:: distributed system
power quality
genetic algorithms; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Powiązania:: https://bibliotekanauki.pl/articles/262783.pdf Link otwiera się w nowym oknie
Opis:: On the basis of the current trends for solving complex technical problems, a new concept of power quality improvement is proposed. It consists in creating a distributed system for supply conditions improvement in a given islanding power system, in e.g. geographical terms (with determined points of delivery), or as an internal installation system of an industrial consumer.
Dostawca treści:: Biblioteka Nauki

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