GaN-Based Split Phase Transformer-Less PV Inverter with Auxiliary ZVT Circuit

Xia, Yinglai; Roy, Jinia; Ayyanar, Raja

doi:10.1049/iet-pel.2019.0498

GaN-Based Split Phase Transformer-Less PV Inverter with Auxiliary ZVT Circuit

Journal Article · Thu Nov 21 04:00:00 EST 2019 · IET Power Electronics

DOI:https://doi.org/10.1049/iet-pel.2019.0498· OSTI ID:1659970

Xia, Yinglai; Roy, Jinia; Ayyanar, Raja

This paper explores performance enhancement of the common ground dynamic dc-link (CGDL) inverter for single phase photovoltaic (PV) applications by a combination of gallium nitride (GaN) devices, split phase topology, coupled inductors, and zero voltage transition (ZVT) scheme. The CGDL inverter has the inherent advantage of minimised dc-link capacitance and negligible leakage current due to the common ground configuration, but its reported efficiency was usually lower because of the higher dc-link voltage used for the reduction of decoupling capacitance to a great extent. To solve the efficiency problem, in this study, a soft switching circuit is proposed for the first stage, while a coupled inductor integrated magnetics is incorporated in the second stage to reduce inductor loss, volume, and cost. Both of these topological improvements combined with the use of GaN devices facilitate in achieving high efficiency without compromising converter power density. Extensive experimental results are provided from a GaN based 1 kVA hardware prototype to demonstrate the superior performance of the CGDL inverter attaining a peak efficiency of 98.7% and a California Energy Commission efficiency of 98.5% at 75/50 kHz switching frequency.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

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

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1659970

Report Number(s):: NREL/JA-5D00-77196; MainId:26142; UUID:5823b8d6-d3cc-485a-a561-4fe065bb1daf; MainAdminID:13706

Journal Information:: IET Power Electronics, Journal Name: IET Power Electronics Journal Issue: 3 Vol. 13

Country of Publication:: United States

Language:: English

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