NDLI: GaN-based split phase transformer-less PV inverter with auxiliary ZVT circuit

Content Provider	IET Digital Library
Author	Xia, Yinglai Roy, Jinia Ayyanar, Raja
Abstract	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.
Starting Page	525
Ending Page	534
Page Count	10
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 3, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0498
Journal	IET Power Electronics
Publisher Date	2019-07-26
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Apparent Power 1.0 KVA Auxiliary Inductor Auxiliary ZVT Circuit Boost Stage Bridge Circuit California Energy Commission Efficiency Capacitance CGDL Inverter Common Ground Configuration Common-ground Dynamic Dc-link Inverter Complementary Device Converter Loss Converter Power Density Coupled Inductor Coupled Inductor Integrated Magnetics DC-AC Power Converter DC-DC Power Converter Dc-link Capacitance Dc-link Voltage Dc-to-ac Power Conversion Dc–dc Stage Decoupling Capacitance Double Line Frequency Power Frequency 50.0 KHz Frequency 75.0 KHz Gallium Compound Gallium Nitride Device GaN GaN Device GaN-based 1 KVA Hardware Prototype GaN-based Split Phase Transformer-less PV Inverter Half Bridge Split Phase Inverter Stage HB Inverter Stage II-VI And III-V SemiConductor III-V SemiConductor Invertors Leakage Current Negligible Leakage-current Power Electronics Power Supply Power Transformer Soft Switching Circuit Split Phase Inductors Split Phase Topology Supervisory Circuit Switching Circuit Switching Converter Switching Node Current Transformer And Reactors Transistor Wide Band Gap SemiConductor Zero Voltage Switching Zero Voltage Transition
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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