Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "AC" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-10 z 10
    Tytuł:
    Predictive and look-up table control methods of a three-level AC-DC converter under distorted grid voltage
    Autorzy:
    Falkowski, P.
    Kulikowski, K.
    Grodzki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/201956.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    three-level AC/DC converter
    direct power control
    finite contol set model predictive control
    lookup table method
    AC/DC
    trzypoziomowy konwerter AC/DC
    Opis:
    Power electronic three-level AC-DC converters connecting a utility grid with DC supplies are widely used in renewable energy sources. For such distributed systems, the quality of energy is very important. Hence, control algorithms of an AC-DC converter have to provide not only a sinusoidal shape of grid current, but also stable operation during transient states in the grid, e.g. voltage dips or voltage unbalance. This paper deals with the problem of robustness of AC-DC control methods under disturbed grid voltage. Three modern predictive control algorithms are presented and investigated under grid voltage distortions. Experimental results from a laboratory test setup illustrating properties of the described methods are shown.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 609-618
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generacja i propagacja zaburzeń elektromagnetycznych w nieizolowanych przetwornicach AC/DC małej mocy
    Generation and propagation of electromagnetic disturbances in non-insulated AC/DC low power converters
    Autorzy:
    Sabat, W.
    Kuryło, K.
    Klepacki, D.
    Kamuda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/269135.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    nieizolowana przetwornica
    AC/DC
    kompatybilność elektromagnetyczna
    zaburzenia przewodzone
    nonisolated AC/DC power converter
    electromagnetic compatibility
    conducted disturbances
    Opis:
    W opracowaniu zostały zaprezentowane wyniki prac doświadczalnych jakie zostały przeprowadzone dla modelowej nieizolowanej przetwornicy AC/DC małej mocy. W ramach prac doświadczalnych zbadano jakie czynnik mają wpływ na poziom i charakter generowanych zaburzeń przewodzonych. Na przykładzie modelowej przetwornicy pokazano jak generowane są zaburzenia, jak są propagowane w jej układzie oraz jak stopień i charakter jej obciążenia wpływa na poziom generowanych zaburzeń. Docelowo układ zasilacza ze sterownikiem VIPer16L został wykorzystany w układzie regulatora obrotów silnika w aplikacji AGD.
    The paper presents the results of the experimental work that was carried out for the model non-insulated AC / DC low power converters. They are used to supply the components of the electrical installation, controls, automation systems in building (sensors of lights, smoke, etc.), remote control systems, time programmers, consumer appliances and lighting components etc. The manufacturers offer now the integrated drivers for the construction of non-isolated converters with power up to several watts. As part of the experimental work the factors which have an influence on the level and nature of conducted disturbances propagation were examined. The example of a model converter shows how the disturbances are generated and propagated in circuit of non-isolated power supply and how the degree and nature of its load affects the level of generated conducted disturbances. It shows how the load condition of the power supply influenced on the level of generated conducted disturbances. Finally, the VIPer16L power supply application has been used in the application of the engine speed regulator for household appliances.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 56; 89-97
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System efficiency for AC vs. DC distribution paradigms: a comparative evaluation
    Autorzy:
    Gelani, Hasan Erteza
    Khan, Sidra
    Dastgeer, Faizan
    Idrees, Zeba
    Afzal, Muhammad Waqas
    Nasir, Mashood
    Powiązania:
    https://bibliotekanauki.pl/articles/2173534.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC vs DC
    DC distribution
    efficiency analysis
    residential loads
    AC/DC
    dystrybucja prądu stałego
    analiza wydajności
    obciążenie mieszkalne
    Opis:
    The birth of electricity witnessed “the battle of currents” between AC and DC as a medium of power transfer. AC won the battle in the first place because of its ability to transform voltage levels. However, with the development of power electronic converters (PECs), DC is striking back. Most of the electronic loads in our conventional AC-based homes are DC by nature. Moreover, the modern concept of energy-efficient variable speed drive (VSD) based loads, i.e. DC-inverter based air-conditioners and refrigerators, require a DC link for their operation. The driving component of all such loads is the PEC. The operational efficiency of PECs depends on the loading which varies throughout the day. This paper presents a mathematical model based on a bottom-up approach to the comparative efficiency analysis of AC and DC distribution systems considering daily load variation. Two topologies are presented where AC and DC distribution systems are compared in terms of efficiency. The first topology (T1) defines a separate/independent converter for each load, whereas in the second topology (T2) loads of a particular class are lumped and driven by a single converter. The results present DC distribution better than AC distribution with an efficiency advantage of 2.28% and 1.57% for T1 and T2, respectively.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e139956, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Cartesian Frame Transformation-Based Control of a Three-Phase Power Converter During Unbalanced Voltage Dip – Part II: Simulation And Experiment
    Autorzy:
    Iwański, Grzegorz
    Maciejewski, Paweł
    Łuszczyk, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1193687.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    AC/DC
    power conversion
    current control
    current limitation
    Opis:
    The paper presents a control method for the three-phase power converter operating under unbalanced grid voltage conditions. The method uses a new transformation to the non-Cartesian frame, which makes the controlled current vector components balanced in this frame even if originally the three-phase current is referenced as unbalanced. Furthermore, Park’s transformation makes the controlled variables constant, which allows to apply proportional–integral terms as current controllers independent of the required control target. Several control targets known from literature have been analyzed with regard to the required new transformation parameters, and the transformation parameters for all targets have been found. Simulation results are shown to prove the theoretical analysis, and the experimental test results are presented as practical validation of the proposed use of the non-Cartesian frame in control.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 63-77
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Cartesian Frame Transformation-Based Control of a Three-Phase Power Converter During Unbalanced Voltage Dip – Part I: Transformation Principles
    Autorzy:
    Iwański, Grzegorz
    Maciejewski, Paweł
    Łuszczyk, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1193698.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    AC/DC
    power conversion
    current control
    Clarke's transformation
    Opis:
    One of the currently investigated problems in power electronics-based electrical energy conversion is proper operation of electronic converters during grid voltage imbalance and harmonics. In classic control methods, it introduces oscillations of variables, resulting in the necessity to improve control systems with signals filtration and usually by application of resonant terms as part of current controllers. The paper presents a new approach to grid-connected inverter control based on transformation to a non-Cartesian frame, the parameters of which are correlated with grid voltage asymmetry. The proposed method results in resignation from resonant terms used as controllers and their replacement with proportional–integral terms for which anti-wind-up structures are significantly simpler than for oscillatory terms. The paper presents new transformation principles, features and some simulation results showing the waveforms of signals transformed to the new non-Cartesian frame.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 47-61
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DC link condition monitoring method for two-level AC/DC/AC converters
    Autorzy:
    Lipnicki, P.
    Lewandowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193395.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    DC link
    condition monitoring
    AC/DC
    power electronics
    converter
    Opis:
    Power electronics is one of the most important elements of today’s industry. Many of converters applications are being considered as critical for plant production process. Offering enhanced functionality in modern AC drives is a way to gain a competitive advantage in power converters market. One of the values to the customers comes from low cost condition monitoring of critical equipment and from optimized maintenance costs. DC bus is one of the elements of power converters. Although the designers pay a lot of attention when designing DC-link circuit, breakdowns and failures of the DC circuit components can still happen. Unfortunately this means that the whole converter must be shut down in emergency mode to be repaired. Nowadays, monitoring of the bus capacitor is becoming one of the desired features from customer side, as well as from the converter manufacturer. Proposed approach presents a method which assures the online evaluation of the equivalent series resistance (ESR) of a DC-link capacitor. The ESR increase trend is an important indicator of accelerated aging process or incoming failure of the capacitor. The important feature of the proposed condition monitoring method is that it does not require any additional sensors. For estimation purposes already installed sensors and other internal converter’s signals are used. Particularly the method employs the DC-link voltage measurement with the DC-link current reconstruction.
    Źródło:
    Power Electronics and Drives; 2017, 2, 37/1; 43-56
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analyses of residential building efficiency for AC and DC distribution networks
    Autorzy:
    Ahmad, Faraz
    Dastgeer, Faizan
    Gelani, Hasan E.
    Khan, Sidra
    Nasir, Mashood
    Powiązania:
    https://bibliotekanauki.pl/articles/2128137.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC distribution system
    efficiency analysis
    AC vs DC
    residential buildings
    solar PV
    system dystrybucji prądu stałego
    analiza wydajności
    prąd zmienny
    prąd stały
    AC/DC
    budynki mieszkalne
    fotowoltaika
    Opis:
    The escalating prevalence of rooftop solar PVs and DC powered home appliances are the driving forces for the research in the field of DC distribution at residential level. The current research work presents comparative analyses of AC and DC distribution systems considering various scenarios for the specific purpose of efficiency/energy savings. A modern Bakersfield CA, USA home is considered for the analyses. The loads are classified according to the power demand. Rooftop solar PVs are also included in each residential building. Mathematical equations are devised for the efficiency analysis of residential buildings powered with AC as well as DC. The results reveal strong dependence of the efficiency values on the utilization/types of loads, efficiencies of the power electronic converters (PECs), solar capacity and seasonal conditions, as a function of the time of day. It is concluded that AC system presents better efficiency values as compared to the DC counterpart except during the time periods when solar power is available and when the penetration of variable speed drive (VSD) based loads is high.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136732, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analyses of residential building efficiency for AC and DC distribution networks
    Autorzy:
    Ahmad, Faraz
    Dastgeer, Faizan
    Gelani, Hasan E.
    Khan, Sidra
    Nasir, Mashood
    Powiązania:
    https://bibliotekanauki.pl/articles/2173601.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC distribution system
    efficiency analysis
    AC vs DC
    residential buildings
    solar PV
    system dystrybucji prądu stałego
    analiza wydajności
    prąd zmienny
    prąd stały
    AC/DC
    budynki mieszkalne
    fotowoltaika
    Opis:
    The escalating prevalence of rooftop solar PVs and DC powered home appliances are the driving forces for the research in the field of DC distribution at residential level. The current research work presents comparative analyses of AC and DC distribution systems considering various scenarios for the specific purpose of efficiency/energy savings. A modern Bakersfield CA, USA home is considered for the analyses. The loads are classified according to the power demand. Rooftop solar PVs are also included in each residential building. Mathematical equations are devised for the efficiency analysis of residential buildings powered with AC as well as DC. The results reveal strong dependence of the efficiency values on the utilization/types of loads, efficiencies of the power electronic converters (PECs), solar capacity and seasonal conditions, as a function of the time of day. It is concluded that AC system presents better efficiency values as compared to the DC counterpart except during the time periods when solar power is available and when the penetration of variable speed drive (VSD) based loads is high.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136732
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial drive systems. Current state and development trends
    Autorzy:
    Orłowska-Kowalska, T.
    Dybkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193153.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vector control
    fault tolerant control
    scalar control
    controlled electrical drive
    AC/DC
    rectifiers
    Opis:
    The article presents the current state and development trends of electrical drives, with particular emphasis on modern control structures and safety systems of various types of electrical machines. Special attention was paid to the needs of industrial drive systems and a possibility of practical implementation of complex control algorithms. Development perspectives of electrical drives are discussed from the perspective of new trends in control, power electronics and electrical machines, with consideration for systems robust to faults of drive system elements.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/1; 5-25
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Overview of Carrier-based Modulation Methods for Z-Source Inverter
    Autorzy:
    Roomi, Muhammad M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193846.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    AC/DC
    power conversion
    impedance source inverter
    modulation methods
    shoot through
    phase opposition disposition
    reference disposition
    Opis:
    Single-stage energy converters, in particular, the Z-Source Inverter (ZSI) or impedance source inverter, has gained significant attention in the recent years. ZSI ensures flexible energy conversions (dc–dc, dc–ac, ac–ac and ac–dc) because of its unique ability to boost the output voltage in typical renewable energy systems. The impedance network integrated between the energy source and the load contributes to the unique functionality of the ZSI. As substantial research has been conducted on the ZSI, this article provides a review on the operation of ZSI. The article initially examines the various topologies commonly adopted for the application of the ZSI. Subsequently, details of the various modulation methods that are commonly used to obtain the voltage boosting using ZSI are documented. Additionally, the phenomenon of neutral point formation, which is an important impediment to the adoption of multilevel ZSIs and the limitation of the modulation methods, is explained.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 15-31
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies