Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies

Tamas Kerekes, Marco Liserre, Remus Teodorescu, C. Klumpner, M. Sumner

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Resumé

This paper analyzes and compares three transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50 kHz, is adopted to study the leakage current paths. The model is validated by both simulation and experimental results. These will be used to compare the selected topologies, and to explain the influence of system unbalance and the neutral conductor inductance on the leakage current. It will be demonstrated that the later has a crucial influence. Finally, a comparison of the selected topologies is carried out, based on the adopted modulation, connection of the neutral and its inductance, effects of unbalance conditions, component ratings, output voltage levels, and filter size.


Udgivelsesdato: September
OriginalsprogEngelsk
TidsskriftIEEE Transactions on Power Electronics
Vol/bind24
Udgave nummer9
Sider (fra-til)2202-2211
ISSN0885-8993
DOI
StatusUdgivet - 2009

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Topology
Leakage currents
Inductance
Modulation
Electric potential

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    title = "Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies",
    abstract = "This paper analyzes and compares three transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50 kHz, is adopted to study the leakage current paths. The model is validated by both simulation and experimental results. These will be used to compare the selected topologies, and to explain the influence of system unbalance and the neutral conductor inductance on the leakage current. It will be demonstrated that the later has a crucial influence. Finally, a comparison of the selected topologies is carried out, based on the adopted modulation, connection of the neutral and its inductance, effects of unbalance conditions, component ratings, output voltage levels, and filter size.",
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    Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies. / Kerekes, Tamas; Liserre, Marco; Teodorescu, Remus; Klumpner, C.; Sumner, M.

    I: IEEE Transactions on Power Electronics, Bind 24, Nr. 9, 2009, s. 2202-2211.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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    T1 - Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies

    AU - Kerekes, Tamas

    AU - Liserre, Marco

    AU - Teodorescu, Remus

    AU - Klumpner, C.

    AU - Sumner, M.

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    AB - This paper analyzes and compares three transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50 kHz, is adopted to study the leakage current paths. The model is validated by both simulation and experimental results. These will be used to compare the selected topologies, and to explain the influence of system unbalance and the neutral conductor inductance on the leakage current. It will be demonstrated that the later has a crucial influence. Finally, a comparison of the selected topologies is carried out, based on the adopted modulation, connection of the neutral and its inductance, effects of unbalance conditions, component ratings, output voltage levels, and filter size.

    KW - Inverters

    KW - Leakage currents

    KW - Pulsewidth-modulated (PWM) inverters

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