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    Tytuł:
    Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters
    Autorzy:
    Wu, W.
    Huang, M.
    Blaabjerg, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/140537.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LCL filter
    LLCL-filter
    efficiency power loss
    modulation
    single-phase grid-tied inverter
    Opis:
    An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 1; 63-79
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current ripple reduction for finite control set model predictive control strategy of grid-tied inverter with reference current compensation
    Autorzy:
    Jin, Nan
    Fan, Wuchuang
    Fang, Jie
    Wu, Jie
    Shen, Yongpeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2202542.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cost function
    current ripple reduction
    finite control set model predictive control
    FCS-MPC
    grid-tied inverter
    reference current compensation
    RCC
    Opis:
    In the finite control set model predictive control (FCS-MPC) strategy of the grid-tied inverter, the current ripple (CR) affects the selection of optimal voltage vectors, which leads to the increase of output current ripples. In order to solve this problem, this paper proposes a CR reduction method based on reference current compensation (RCC) for the FCS-MPC strategy of grid-tied inverters. Firstly, the influence of the CR on optimal voltage vector selection is analyzed. The conventional CR prediction method is improved, which uses inverter output voltage and grid voltage to calculate current ripples based on the space state equation. It makes up for the shortcomings that the conventional CR prediction method cannot predict in some switching states. The improved CR method is more suitable for the FCS-MPC strategy. In addition, the differences between the two cost functions are compared through visual analysis. It is found that the sensitivity of the square cost function to small errors is better than that of the absolute value function. Finally, the predicted CR is used to compensate the reference current. The compensated reference current is substituted into the square cost function to reduce the CR. The experimental results show that the proposed method reduces the CR by 47.3%. The total harmonic distortion (THD) of output current is reduced from 3.86% to 2.96%.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 5--22
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review and comparison of methods for limiting leakage currents in single-phase transformerless PV inverter topologies
    Autorzy:
    Kołodziejski, Wojciech
    Jasielski, Jacek
    Kuta, Stanisław W.
    Szerszeń, Grzegorz
    Machowski, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/29521110.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Tarnowska
    Tematy:
    Differential Mode (DM) voltage
    Common Mode (CM) voltage
    grid-tied inverter
    leakage current
    parasitic capacity
    photovoltaic (PV) systems
    transformerless inverter
    napięcie trybu różnicowego (DM).
    napięcie trybu wspólnego (CM).
    falownik podłączony do sieci
    prąd upływowy
    pojemność pasożytnicza
    systemy fotowoltaiczne (PV).
    falownik beztransformatorowy
    Opis:
    Transformerless inverters are widely used in different photovoltaic nonisolated ac module applications, mainly in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency over a wide load range, and low cost. Various transformerless inverter topologies have been proposed to meet the safety requirement of low ground leakage currents, such as specified in the VDE-4105 standard and low-output ac-current distortion. Topology modifications of transformerless full bridge inverters are designed to balance and maintain a constant common mode output voltage, thereby eliminating or reducing leakage currents. This article reviews and compares the different methods for limiting leakage currents in known topologies of the full-bridge transformerless inverters, such as: H4, H5, H6, HERIC, and their improvements. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. To compare the properties of different medium to high power inverters, PV inverter topologies were implemented using IGBTs and tested with the same components, same simulation parameters in PSPICE to evaluate their performance in terms of energy efficiency and leakage current characteristics. The detailed power stage operating principles, extended PWM modulator, and integrated universal gate driver with galvanic isolation in the transmission path of control signal for all IGBTs of the inverter, as well isolated and floating bias power supply for gate drivers are described.
    Źródło:
    Science, Technology and Innovation; 2022, 16, 3-4; 1-19
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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