High Step-Up Transformerless Inverter for AC Module Applications With Active Power Decoupling

Roy, Jinia; Xia, Yinglai; Ayyanar, Rajapandian

doi:10.1109/tie.2018.2860538

High Step-Up Transformerless Inverter for AC Module Applications With Active Power Decoupling

Journal Article · Fri Aug 03 00:00:00 EDT 2018 · IEEE Translations on Industrial Electronics

DOI:https://doi.org/10.1109/tie.2018.2860538· OSTI ID:2446684

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National Renewable Energy Laboratory (NREL), Golden, CO (United States); PowerAmerica/NC State
Texas Instruments, Dallas, TX (United States)
Arizona State University, Tempe, AZ (United States)

This paper explores a power conversion system for single phase transfomer-less AC module application. A nonisolated high gain dc-dc stage is coupled with a doubly grounded dynamic dc-link inverter to implement the microinverter topology. The front-end boost stage steps up the single module voltage to a higher dc voltage, typically to 200 V or 400 V as required for the following inverter stage. It is a hybrid of an interleaved boost and switched capacitor concept capable of achieving high gain while simultaneously maintaining reduced voltage and current stress and thus lower switching and conduction loss for most of the switches. By directly connecting the grid neutral to the PV negative, the doubly grounded voltage swing inverter has the advantage of zero capacitive-coupled common-mode ground currents, critical for transformer-less PV inverters. The two dc-links of the inverter stage share the double line frequency power decoupling with a combination of higher value of mean voltage and relatively large 120 Hz ripple component - the dynamic dc-link approach. Through an optimization algorithm, the decoupling capacitance is minimized enabling an all-film capacitor implementation while satisfying the converter’s operating constraints over a wide range of power factor. Furthermore, the simulation as well as experimental results from a GaN based hardware prototype validate the converter’s performance.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0006521

OSTI ID:: 2446684

Alternate ID(s):: OSTI ID: 1613353

Journal Information:: IEEE Translations on Industrial Electronics, Journal Name: IEEE Translations on Industrial Electronics Journal Issue: 5 Vol. 66; ISSN 0278-0046

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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High Step-Up Transformerless Inverter for AC Module Applications With Active Power Decoupling

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