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Wyszukujesz frazę "power factor" wg kryterium: Temat


Tytuł:
Układ sterowania przekształtnikiem AC-DC z funkcją korekcji współczynnika mocy PFC
A control system for AC-DC converter with the function of a power factor correction PFC
Autorzy:
Mrozek, M.
Powiązania:
https://bibliotekanauki.pl/articles/257187.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
współczynnik mocy
przekształtnik AC-DC
korekcja współczynnika mocy
PFC
Power Factor Correction
power factor
AC-DC converter
power factor correction
Opis:
Jedną z miar odpowiedniego wykorzystania energii w zasilaczach impulsowych jest współczynnik mocy (PF). Wpływ na wartość tego współczynnika ma przesunięcie fazowe między napięciem a prądem, a także zawartość składowych harmonicznych prądu pobieranego z sieci. W celu korekcji współczynnika mocy stosuje się odpowiednie układy bierne lub aktywne. W artykule opisano mikroprocesorowy układ sterowania przetwornicą AC-DC z funkcją aktywnej korekcji współczynnika mocy PFC (ang. Power Factor Correction). Opisano strukturę przekształtnika AC-DC bazującego na topologii przekształtnika DC-DC step-up (Boost) przy założeniu ciągłego prądu dławika modulacji PWM o częstotliwości 20 kHz.
One of the measures of the appropriate use of energy in a pulsed power supply is the power factor (PF), which corresponds to losses in the transmission of electricity. The phase shift has an influence on the power factor between voltage and current as well as the content of power system harmonics taken from power mains. To correct the power factor, one should use a suitable passive or active circuit. The microprocessor control system of an AC-DC converter with an active power factor correction function is presented in the article. The general structure of a controller and an algorithm of controlling PFC in topology step-up (Boost) with a continuous conduction mode and modulation PWM and frequency 20 kHz is described.
Źródło:
Problemy Eksploatacji; 2012, 3; 145-154
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Case of Hidden Instantaneous Powers
Autorzy:
Balci, M. E.
Emanuel, A. E.
Powiązania:
https://bibliotekanauki.pl/articles/262606.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
harmonics
power definitions
power factor
Opis:
This brief communication addresses the case of a dc nonlinear load supplied with a perfectly constant instantaneous power. A careful analysis shows that this condition does not provide optimum transfer of electric energy .
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 3-5
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power quality enhancement of three-phase front-end rectifier of UPS system using current injection technique
Autorzy:
Dhomane, G. A.
Suryawanshi, H.
Powiązania:
https://bibliotekanauki.pl/articles/262756.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
high frequency current injection
high power factor
soft transition
power factor correction circuit
Opis:
Power Quality, in terms of power factor and harmonics, is greatly hampered by a three-phase rectifier used as a front-end ac-to-dc converter in many systems including a UPS. This paper presents the high power factor operation of the converter with reduced total harmonic distortion up to 4%. The power quality up gradation is due to high-frequency current injection, at the input of the front-end rectifier. A small filter is required at the output for filtering the high-frequency content. Sinusoidal PWM technique is used for controlling the output voltage. DSP is used for generating the desired gate pulses. The converter has high efficiency, low EMI emissions, high power packing density and suitable for UPS system. A Simulation and experimentation is carried out on a 3 kW converter and experimental results are in good agreement with simulation results.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 35-39
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sampled Method of Active Power Filter Control. Part II
Autorzy:
Szromba, A.
Powiązania:
https://bibliotekanauki.pl/articles/262604.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
shunt active power filter
power factor
power quality
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.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 29-39
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sampled method of active power filter control. Part 1
Autorzy:
Szromba, A.
Powiązania:
https://bibliotekanauki.pl/articles/262771.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
shunt active power filter
power factor
power quality
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.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 91-98
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of characteristics of modern electric light sources at the example of led lamp
Autorzy:
Khimka, S.
Powiązania:
https://bibliotekanauki.pl/articles/410938.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
LED lamps
lighting
light output
power factor
Opis:
In this article we consider the questions of studying the characteristics of modern light sources on the example of LED lamps (LED). The problem of energy savings gained weighty significance in recent years, particularly in the light. In many developed countries as a way to reduce power consumption the replacement of incandescent lamps to LED is considered. LED are advanced energy efficient lamps, but much of the lamps that are coming on the inner market of Ukraine do not correspond to the declared lighting and electrical parameters. That is why we investigated LED lamps of such brands as «AUKES», «OK», «Iskra», «Lemanso» if they are in accordance with lighting and electrical parameters. The results of the study indicate that among the investigated parties of lamps value for active power of all the producing capacity does not meet the stated on the package. On the basis of experiments we also determined the dependence of illuminance E, Lx of voltage U, V. On the basis of this study we can say that most of LED lamps when changing the voltage in the range of 180 -240 V LED illumination is proportional to approximately 1% ( ± 0,2%) with a change in voltage at 1%. As we have seen from the research the alleged power LED lamps does not match the experimental data, in some cases more than 30% - LED (AUKES). A major drawback of LED, that enter the market in Ukraine is a low power factor, which varies between 0,51-0,63 further reduces technical and economic parameters of power supply and increases electric gates.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 3; 71-75
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of power quality of the mains on operation characteristics of an uncontrolled and controlled induction motor
Autorzy:
Orsag, P.
Kocman, S.
Svoboda, P.
Powiązania:
https://bibliotekanauki.pl/articles/1813603.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
power quality
power factor
efficiency
drive
induction motor
Opis:
The paper deals with the influence of power quality indices: the voltage distortion, the voltage unbalance and the voltage dip in the mains on operation characteristics of an induction motor directly fed from both the source and the frequency converter, and their comparing. There are mainly investigated energy characteristics as motor efficiency and motor power factor depending on the motor load in the paper. It is also shown that permitted power quality levels of both the voltage distortion and unbalance, especially in the case of the controlled drive, does not influence the induction motor operation characteristics a lot.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 350-356
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the voltage unbalance and voltage variations on operation characteristics of an electrical drive with an induction motor
Autorzy:
Orság, P.
Kocman, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813860.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
distortion
efficiency
induction motor
power factor
unbalance
Opis:
Induction motors are the most widespread types of electrical motors in electrical drives. Their main advantages include high reliability, simple construction and corresponding nearly maintenance-free, and the possibility to feed them from the common AC power network. To control their speed, frequency converters are widely used in structures of adjustable speed drives. This paper deals with the influence of voltage unbalance and voltage variations in the supply network on operation characteristics of a tested adjustable speed drive with an induction motor and a frequency converter. Supply voltage parameters were adjusted using a programmable power source Pacific 3120AMX. Monitored drive parameters were computed from measured signals and depicted in graphs. Calculated parameter dependencies have confirmed an increase in the input current drive distortion and changes in its harmonic spectrum caused by an unbalance of the supply voltage, and only moderate influence of voltage variations on efficiency of drive components and total drive efficiency.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2013, 69, 33; 308--320
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power factor correction algorithm in AC-DC converter
Algorytm korekcji współczynnika mocy PFC w przekształtniku AC-DC
Autorzy:
Mrozek, M.
Powiązania:
https://bibliotekanauki.pl/articles/257199.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
power factor
power factor correction (PFC)
AC-DC converter
współczynnik mocy
korekcja współczynnika mocy PFC
przekształtnik AC-DC
Opis:
Power factor is a measure of the energy efficiency of the unit and corresponding losses in the transmission of electricity. Its value depends on the phase shift between voltage and current and the harmonic content of the supply current. In order to correct power factor circuits, the relevant passive or active circuits are used. This paper describes the algorithm for active power factor correction PFC control circuit AC-DC converter in the configuration step-up (boost) with continuous conduction current with the PWM modulation 20 kHz frequency. The results of studies of the dynamics of the converter are presented.
Współczynnik mocy PF (ang. Power Factor) jest miarą wykorzystania energii przez urządzenie i odpowiada stratom w przesyłaniu energii elek-trycznej. Jego wartość zależy od przesunięcia fazowego między napięciem a prądem oraz zawartości składowych harmonicznych prądu pobieranego z sieci. W celu korekcji współczynnika mocy stosuje się odpowiednie układy bierne lub aktywne. W artykule opisano algorytm aktywnej korekcji współczynnika mocy PFC (ang. Power Factor Correction) w układzie sterowania przekształtnikiem AC-DC w konfiguracji step-up (Boost) z przewodzeniem ciągłym prądu z modulacją PWM o częstotliwości 20 kHz. Przedstawiono wyniki badań dyna-miki przekształtnika.
Źródło:
Problemy Eksploatacji; 2013, 2; 129-139
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Definition of Apparent Power
Autorzy:
Canturk, S.
Balci, M. E.
Hocaoglu, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/262701.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
apparent power
power factor
uunbalanced and non-sinusoidal conditions
Opis:
In this paper, the widely recognised apparent power definitions, which are Arithmetic, Vector, IEEE standard, DIN standard apparent power definitions and the apparent power definition of Mayordomo and Usaola, are rigorously reviewed, and their abilities on the measurement of the system’s power transfer efficiency are analysed by using a specially derived apparent power, which is calculated in terms of the total line losses of the system with and without the reactive power compensation. In the analyses, two major compensation strategies, namely the minimum line loss (MLL) and sinusoidal and balanced current (SBC) compensation strategies, are considered to determine the total line loss of the system with the compensation. Therefore, in a representative nonsinusoidal and unbalanced test system, the results are simulated by taking into account unbalance among the resistances of neutral and phase lines. The simulated results show that under nonsinusoidal and unbalanced conditions, the unbalance among the resistances of neutral and phase lines highly affects the system’s power transfer efficiency. Additionally, Mayordomo and Usaola’s apparent power definition can be used for proper measurement of the power transfer efficiency in the nonsinusoidal and unbalanced systems. On the other hand, the accuracies of the rest of the reviewed definitions considerably depends on unbalance among the resistances of neutral and phase lines. It should also be mentioned that the accuracies of the apparent power definitions are considerably not affected by the type of compensation strategy.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2015, 18, 2; 1-9
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Harmonic compensation using the sliding DFT algorithm for three-phase active power filter
Autorzy:
Sozański, K. P.
Powiązania:
https://bibliotekanauki.pl/articles/262743.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
active filters
harmonics
DSP
power quality
power factor correction
Opis:
This paper describes the sliding discrete Fourier transform (DFT) algorithm as an alternative for typical DFT used for spectrum analysis and synthesis. As an example a control circuit for a three-phase 75 kVA parallel active power filter (APF) is used. Such filters have been built and tested. Some illustrative, experimental results are also presented in the paper. The control algorithms of the proposed APF are implemented in the fixed-point digital signal processor TMS320C50. The presented control APF algorithm is a good alternative to classical APF control algorithms, because it allows easy selection of control parameters in mains currents: imbalance, reactive power or harmonics contents. In the proposed circuit transient performance of APF is improved using non-causal predictive current compensation.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 15-20
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ènergoèffektivnost èkspluatacii tehničeskih sistem
Autorzy:
Švarcburg, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/360128.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
technical systems
exploitation
energy efficiency
power factor
compensation
Opis:
The paper shows that the low energy efficiency exploitation of technical systems to a large extent determines their negative impact on the environment and humans. On the basis of the energy balance equation shows that the decrease in efficiency due to the loss of energy during its conversion and the transmission and power factor with reduced electrical devices technical systems. Reduced power factor due to the fact that the technical system operation the power consumption of the drive motor on the shaft of these systems much less than its nominal value. Loss of energy and reducing power factor leads to contamination of the environment and reduction of human security in the operation of technical systems. The most effective way to improve the energy efficiency of operation is to improve the power factor by compensating the phase shift, which reduces the current consumption due to compensation of the reactive component of it. Experimental research in machine tool technology systems have shown that the application of the method of compensation of phase shift can significantly improve the energy efficiency of the operation of these systems. This significantly reduces the amount of power consumption, the value of its reactive component and the input current and greatly increasing the power factor of technical systems in their operation.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 132-137
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of source voltage harmonics on power factor compensation in ac chopper circuits
Autorzy:
Balci, M. E.
Hocaoglu, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/262639.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
harmonics
ac chopper circuits
power factor
reactive power compensation
nonsinusoidal conditions
Opis:
In recent years, the detailed modelling of power electronic devices and their behaviours on various system conditions are a great concern of the power industries and customers. One of the widely proliferated such devices is the triac controlled ac choppers. Although these types of devices have important application areas, their poor power factor is the main obstacle for the large scale implementation in power systems. This paper presents an analysis on the behaviour of a single phase load composed with triac controlled ac chopper during the reactive power compensation with a basic capacitor in nonsinusoidal voltage case. The results of these analysis show that the distortion of voltage improves power factor, which is contradicting with previous findings, for the high conduction angles of triac controlled ac chopper. In addition, it is observed that the performance of power factor improvement with a basic capacitor is noticeably affected by the phase angles of voltage harmonics, which is an extensively ignored issue in the literature.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 53-60
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analysis of generation and compensation of reactive power in photovoltaic power plants
Analiza teoretyczna powstawania i kompensacji mocy biernej w elektrowniach fotowoltaicznych
Autorzy:
Koníček, M.
Cintula, B.
Powiązania:
https://bibliotekanauki.pl/articles/407948.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
photovoltaic power plants
compensation
reactive power
power factor
elektrownie fotowoltaiczne
kompensacja
moc bierna
współczynnik mocy
Opis:
The paper is focused on the theoretical analysis of potential options of reactive power origin and its compensation in photovoltaic power plants. In the first part of paper parts of photovoltaic power plants, which can be a source of inductive or capacitive reactive power are described. The second part describes a compensation of reactive power and reasons of requirement of reactive power compensation. Further we describe the basic types of the presently most frequently used reactive power compensation equipment in photovoltaic power.
Artykuł poświęcony jest teoretycznej analizie potencjalnych możliwości powstawania mocy biernej w elektrowniach fotowoltaicznych i jej rekompensacji. W pierwszej części opisano elementy składowe elektrowni fotowoltaicznych, które mogą być źródłem indukcyjnej lub pojemnościowej mocy biernej. W drugiej części opisano kompensację mocy biernej i ze przyczyny wymogu kompensacji mocy biernej. Następnie analizowane są podstawowe typy najczęściej obecnie stosowanych urządzeń do kompensacji mocy biernej w elektrowniach fotowoltaicznych.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2016, 2; 38-41
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie parametrów hydrogeologicznych i geotermicznych oraz automatyzacja obliczeń zasobów geotermalnych w skali regionalnej na przykładzie konstrukcji współczynnika mocy
Modelling of hydrogeological and geothermal parameters and automation of geothermal resources calculation on a regional scale, example of the power factor construction
Autorzy:
Hajto, M.
Powiązania:
https://bibliotekanauki.pl/articles/2075118.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
zasoby geotermalne
współczynnik mocy
parametry hydrogeotermalne
geothermal resources
power factor
hydrogeothermal parameters
Opis:
This paper presents proposals for application of methodology of evaluation of geothermal resources on a regional scale, focusing on economic efficency of heat recovery through the analysis of the power factor distribution. The concept of the power factor design by Gosk (1982) is discussed according to the present conditions of socio-economic development in our country, including the prices of alternative fuel (coal), the current cost of drilling, etc. In the paper a solution for automation of geothermal resources calculation, based on complex operations on the three-dimensional spatial models (grids) using the specialized software for interpretation of geological data’s of Landmark Graphics Corporation – ZMap Plus package is presented. Attention is drawn to the possibility of using specialized programming macro language ZCL (Zycor Command Language) to perform complex, often repetitive, mathematical procedures, what significantly speeds up the calculation procedures and may reduce the computational errors.
Źródło:
Przegląd Geologiczny; 2014, 62, 12; 852--855
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł

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