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    Wyświetlanie 1-2 z 2
    Tytuł:
    Theoretical analysis of the efficiency of a V2G wireless charger for electric vehicles
    Autorzy:
    Triviño, Alicia
    Gonzalez-Gonzalez, Jose M.
    Aguado, Jose A.
    Powiązania:
    https://bibliotekanauki.pl/articles/136256.pdf
    Data publikacji:
    2019
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    V2G
    wireless discharge
    losses
    efficiency
    electric vehicle
    inductively-coupled power system
    ICPT
    bidirectional
    wireless charging
    Opis:
    V2G (Vehicle-to-grid) technology will report important benefits for the operation and safety of the grid. In order to facilitate the expansion of the V2G technology in a future, it is recommended to offer the drivers with easy to use methods to charge and discharge their EV batteries. In this sense, wireless chargers are expected to play a relevant role in the future electrical networks as it reduces the users intervention. The development of this kind of system is still open to improve them in terms of their operation, their compliance and their control. An important issue for the evaluation of these systems is the efficiency, which measures the power losses occurring in the system. This paper addresses a deep study about the losses in a bidirectional wireless charger. Then, it provides with a mathematical model to characterize them. This model is validated by means of experimental results conducted in a 3.7-kW prototype.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2019, 3, 1; 9-14
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System identification and tuning of wireless power transfer systems with multiple magnetically coupled resonators
    Autorzy:
    Winges, J.
    Rylander, T.
    Petersson, C.
    Ekman, C.
    Johansson, L.-Å.
    McKelvey, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/136270.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    wireless power transfer
    magnetically coupled resonators
    system identification
    tuning
    Bayesian estimation
    impedance matching
    charging electric vehicles
    Opis:
    We present a procedure for system identification and tuning of a wireless power transfer (WPT) system with four magnetically coupled resonators, where each resonator consists of a coil and a capacitor bank. The system-identification procedure involves three main steps: 1) individual measurement of the capacitor banks in the system; 2) measurement of the frequency-dependent two-port impedance matrix of the magnetically coupled resonators; and 3) determining the inductance of all coils and their corresponding coupling coefficients using a Bayesian approach. The Bayesian approach involves solving an optimization problem where we minimize the mismatch between the measured and simulated impedance matrix together with a penalization term that incorporates information from a direct measurement procedure of the inductance and losses of the coils. This identification procedure yields an accurate system model which we use to tune the four capacitance values to recover high system-performance and account for, e.g., manufacturing tolerances and coil displacement. For a prototype WPT system, we achieve 3.3 kW power transfer with 91% system efficiency over an air-gap distance of approximately 20 cm.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 86-92
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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