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    Wyświetlanie 1-9 z 9
    Tytuł:
    Analog-based duobinary-4-PAM for electrical bandwidth limited optical fiber links
    Autorzy:
    Suhr, L.F.
    Madsen, P.
    Monroy, I. T.
    Olmos, J. J. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/173933.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    optical communications
    advanced modulation formats
    multilevel modulation
    Opis:
    This paper presents a demonstration of a seven level duobinary-4-PAM signal operating at 10.16 Gbit/s. The polybinary generation is achieved by a simple electrical Bessel filter of 5th order, with a frequency cut-off of 1.8 GHz. We assess the impact of the filter placement, either at the transmitter or the receiver, and find the impact is minimal in terms of bit error rate performance in transmissions of up to 40 km of single mode fiber.
    Źródło:
    Optica Applicata; 2016, 46, 1; 71-78
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cascaded multilevel converters in recent research and applications
    Autorzy:
    Malinowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199898.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multilevel converters
    cascaded converters
    modular multilevel converter
    modulation
    solid state transformer
    photovoltaic systems
    konwerter
    przetwornica
    modulacja
    transformator
    systemy fotowoltaiczne
    Opis:
    Multilevel converters have been intensively investigated and developed since 1960s and have found successful industrial applications. The aim of this paper is to present state of the art as well as recent research and applications of cascaded multilevel converters, which are a very interesting solution for power distribution systems and renewable energy sources. Cascaded multilevel converters can easily operate at medium and high voltage based on the series connection of power modules (cells), which use standard low-voltage component configurations. Series connections of modules (cells) allow for high quality output voltages and input currents, reduction of passive components and availability of component redundancy. Due to these features the cascaded multilevel converters have been recognized as attractive solutions for high-voltage direct-current (HVDC) transmission, solid state transformers (SST) and photovoltaic (PV) systems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 567-578
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized space vector control for current source inverters and rectifiers
    Autorzy:
    Anitha Roseline, J.
    Senthil Kumaran, M.
    Rajini, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/140525.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    current source rectifiers (CSR)
    current source inverters (CSI)
    current source multilevel inverter (CSMLI)
    space vector pulse width modulation (SVPWM)
    Opis:
    Current source inverters (CSI) is one of the widely used converter topology in medium voltage drive applications due to its simplicity, motor friendly waveforms and reliable short circuit protection. The current source inverters are usually fed by controlled current source rectifiers (CSR) with a large inductor to provide a constant supply current. A generalized control applicable for both CSI and CSR and their extension namely current source multilevel inverters (CSMLI) are dealt in this paper. As space vector pulse width modulation (SVPWM) features the advantages of flexible control, faster dynamic response, better DC utilization and easy digital implementation it is considered for this work. This paper generalizes SVPWM that could be applied for CSI, CSR and CSMLI. The intense computation involved in framing a generalized space vector control are discussed in detail. The algorithm includes determination of band, region, subregions and vectors. The algorithm is validated by simulation using MATLAB /SIMULINK for CSR 5, 7, 13 level CSMLI and for CSR fed CSI.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 2; 235-248
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grid-Tied Neutral Point Clamped based Centralised Photovoltaic Inverter with Improved DC Link Voltage Balancing and Harmonic Minimisation Control
    Autorzy:
    Bhowmick, Supratik
    Mukherjee, Debranjan
    Maiti, Suman
    Chakraborty, Chandan
    Powiązania:
    https://bibliotekanauki.pl/articles/1955983.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photovoltaic multilevel inverter
    neutral point voltage balancing
    space vector pulse width modulation
    current harmonic minimisation
    Opis:
    This paper proposes an improved space vector pulse width modulation (SVPWM) based DC link voltage balancing control of a three-phase three-level neutral point clamped (NPC) centralised inverter supplying the generated power from photo voltaic (PV) array to a three-phase utility grid. Two possible schemes have been developed based on the power conversion stage between PV array and the utility grid namely, two-stage (three-level boost converter three-phase three-level NPC inverter) and single-stage (three-phase three-level NPC inverter alone). The comparison between these two schemes has been thoroughly discussed in terms of the control strategies employed, power loss analysis and efficiency. The performance of the centralised inverter under different modes of operation has been investigated by developing the required control strategies for smooth operation. Using the proposed control strategy, the centralised inverter can be operated as a static synchronous compensator (STATCOM) during night time, if needed. The power loss incurred in the power-electronic converters has been analysed for constant and also for variable ambient temperature. The effectiveness of the centralised inverter as an active filter (AF) has also been verified when a three-phase non-linear load is considered in the system.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 185-203
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integer factor based SVPWM approach for multilevel inverters with continuous and discontinuous switching sequences
    Autorzy:
    Suresh, Kumar Anisetty
    Sri, Gowri Kolli
    Nagaraja, Rao Sulake
    Manjunatha, Budagavi Matam
    Sesi, Kiran Ponnapati
    Niteesh, Kumar K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955193.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    integer factor approach
    inverters
    multilevel inverters
    optimum switching sequence
    space vector modulation
    SVPWM
    metoda współczynnika całkowego
    inwertery
    inwertery wielopoziomowe
    optymalna sekwencja przełączania
    modulacja wektora przestrzeni
    Opis:
    The most extensively employed strategy to control the AC output of power electronic inverters is the pulse width modulation (PWM) strategy. Since three decades modulation hypothesis continues to draw considerable attention and interest of researchers with the aim to reduce harmonic distortion and increased output magnitude for a given switching frequency. Among different PWM techniques space vector modulation (SVM) is very popular. However, as the number of output levels of the multilevel inverter (MLI) increases, the implementation of SVM becomes more difficult, because as the number of levels increases the total number of switches in the inverter increases which will increase the total number of switching states, which will result in increased computational complexity and increased storage requirements of switching states and switching pulse durations. The present work aims at reducing the complexity of implementing the space vector pulse width modulation (SVPWM) technique in multilevel inverters by using a generalized integer factor approach (IFA). The performance of the IFA is tested on a three-level inverter-fed induction motor for conventional PWM (CPWM) which is a continuous SVPWM method employing a 0127 sequence and discontinuous PWM (DPWM) methods viz, DPWMMIN using 012 sequences and DPWMMAX using a 721 sequence.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 859-872
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and simulation of novel stepped DC coupled quasi Z-Multilevel Inverter for single phase systems
    Autorzy:
    Meenakshi, T.
    Suthanthira Vanitha, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/140968.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multilevel inverter
    shoot through
    quasi Z-Source
    modulation index
    Opis:
    This paper presents the modeling and simulation of a novel topology of quasi Z-Multilevel Inverter with stepped DC input. The proposed inverter incorporates a simple switching technique with reduced component count and is aimed at producing boosted multilevel output AC voltage. The inverter consists of two stages and the buck /boost operation is obtained by varying the shoot through period of the pulses obtained by maximum constant boost control with third harmonic injection. With all the advantages of the quasi Z-network, the proposed inverter eliminates the fly back diodes and capacitors present in a conventional Z-Multilevel Inverter. Further the stress on the devices is less which leads to reduction in component value and hence the cost. The novel stepped DC coupled Single Phase quasi Z-Multilevel Inverter is modeled and simulated in the MATLAB – SIMULINK environment and its performance is analyzed for varying input and switching conditions. The voltage and current waveforms across each stage of the inverter is analyzed and the results are presented for different levels of input.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 3; 437-448
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified Topology and Modulation Technique for Z-Source Neutral-Point Clamped Inverter
    Autorzy:
    Akbari, Ehsan
    Zishan, Farhad
    Powiązania:
    https://bibliotekanauki.pl/articles/2175930.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    modulation
    optimization
    multilevel inverter
    MZS-NPC
    Opis:
    The impedance network makes it possible to increase and decrease the voltage, which is not available in normal inverters (voltage and current sources).This paper presents a modified topology and modulation technique for a three-phase Modified Z-Source Neutral-Point Clamped (MZS-NPC) inverter. A modulation scheme for the proposed topology is designed based on maximum gain control method to achieve the maximum voltage gain by simple implementation and balancing the neutral point voltage of the dc link. In order to supply the desired voltage to the critical load in an islanded micro-grid, a closed-loop ac voltage controller is realized in fuel cell or photovoltaic applications based on the proposed inverter. The ability to reinforce and validity of topology operations and modulation techniques has been demonstrated by simulation. It should be noted that the simulations are implemented in MATLAB / Simulink software.
    Źródło:
    Power Electronics and Drives; 2022, 7, 42; 210--226
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-source three-phase switched-capacitor-based MLI
    Autorzy:
    Jena, Kasinath
    Gupta, Krishna Kumar
    Bhatnagar, Pallavee
    Jain, Sanjay K.
    Stala, Robert
    Waradzyn, Zbigniew
    Piróg, Stanisław
    Penczek, Adam
    Mondzik, Andrzej
    Skała, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/2175942.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multilevel inverter
    switched capacitor
    multicarrier pulse width modulation
    cost function
    ANPC inverter
    Opis:
    This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation.
    Źródło:
    Power Electronics and Drives; 2022, 7, 42; 197--209
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes
    Autorzy:
    Tomasov, V.
    Usoltsev, A.
    Zolov, P.
    Gribanov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200303.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multilevel inverter
    space vector modulation
    modulation algorithm
    current ripple
    precision AC drive
    inwerter
    modulacja
    napęd AC
    Opis:
    The effect of space vector modulation algorithm on magnitude of current vector ripples was considered on the mathematical model of a three-level three-phase voltage inverter with symmetric active inductive load. Limitations on the use of such inverters as a power supply for precision drive of optical telescopes were specified.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 629-637
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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