A GaN based doubly grounded, reduced capacitance transformer-less split phase photovoltaic inverter with active power decoupling

Xia, Yunfeng; Roy, Jinia

doi:10.1109/apec.2017.7931121

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…The two voltage levels for the asymmetric HB inverter stages are

v_{in}

and

v_{low}

(

v_{low} = v_{link} - v_{in}

). The basic topology reported with preliminary results in [15] is a modification of the split phase dc–ac converter proposed in [10] where the decoupling capacitor is removed from the lower HB link

v_{low}

to the main dc‐link

v_{link}

. It enables a significant saving in the decoupling capacitor cost and volume, and reduction of the input capacitor RMS current across the PV string as well as the RMS and peak current through the inductor

L_{normalb}

[11].…”

Section: Circuit Configuration and Operationmentioning

confidence: 99%

“…Additionally, to improve the reliability of single phase PV inverters, the power decoupling capacitors need to be decreased by implementing active power decoupling techniques [7][8][9], such that widely used electrolytic capacitors can be replaced by the longer lifetime film capacitors. The topologies proposed in [10][11][12][13][14] are attractive solutions for high power density and reliable single phase transformer-less PV application as they address both the aforementioned challenges simultaneously through active power decoupling and common ground implementation [15].…”

Section: Introductionmentioning

confidence: 99%

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GaN‐based split phase transformer‐less PV inverter with auxiliary ZVT circuit

Xia

Roy

2020

IET power electron.

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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.

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“…The two voltage levels for the asymmetric HB inverter stages are

v_{in}

and

v_{low}

(

v_{low} = v_{link} - v_{in}

v_{low}

to the main dc‐link

v_{link}

L_{normalb}

[11].…”

Section: Circuit Configuration and Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

GaN‐based split phase transformer‐less PV inverter with auxiliary ZVT circuit

Xia

Roy

2020

IET power electron.

Self Cite

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show abstract

“…Also propose a topology ready to remove dispersion current in a very common method, sitting an excellent challenge in PV inverters while not transformers. A new circuit arrangement associated with control theme for a 1-ɸ inverter has been discussed [6][7][8]. A brand-new methodology for decoupling real power employing a 6-switch 1-ɸ inverter methodology has been proposed.…”

Section: Literature Surveymentioning

confidence: 99%

Active Power Decoupling Topology for Single Phase Bridge Inverter based on Buck-Boost Convertor

Hans,

Godashe,

Prakash

et al. 2019

IJEAT

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Increasing demand of power has led to exploration of non-conventional sources of energy. Solar energy has been the most exploited source of energy in this regard. Effectiveness of power utilization depends on the power conversion from AC to DC. Further improvement in utilization of DC power depends on the DC-DC conversion steps involved. The planned methodology offers a study of power decoupling method while no further power semiconductor are used for a DC to 1-ɸ AC device. 1-ɸ voltage source bridge inverters have primarily two drawbacks, that's reduction in DC voltage usage and disparity in power among the incoming and outgoing sides. These difficulties have been looked upon and a topology has been implemented that uses just a film capacitance beforehand buck-boost convertor that is linked to the voltage-source bridge inverter. Reenactment and preliminary outcome confirmed the credibility of the planned power decoupling technique on the 2-stage 1-ɸ bridge inverter by buck-boost convertor.

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“…As a recent achievement, the proposed topology in [2,3] can successfully minimize the decoupling capacitance requirement by a variable DC-link with a large voltage swing. In this topology only one 45𝜇F DC-link capacitance is used.…”

Section: Introductionmentioning

confidence: 99%

Flying‐inductor‐cell based inverters for single‐phase transformerless PV applications

Aalami

Zarif

Alishahi

et al. 2022

IET Power Electronics

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The application of the general flying‐inductor (FI) cell in two novel transformerless photo‐voltaic (PV) inverters are proposed and investigated. The simultaneous step up and down ability is possible with both topologies, while a high conversion efficiency and a high‐quality AC current are achieved. The leakage current problem, which is a main concern with the transformerless PV inverters, is also considered. One of the proposed topologies presents a higher efficiency, while the other one provides the high quality of injected current with the lowest number active switches. The current control, especially at transition modes of operation is highly improved by utilizing a fast response dead‐beat control scheme. The working principles of the proposed converters are explained in details and 0.88‐kW experimental prototypes are implemented to confirm the theoretical achievements. Finally, a comparison with other existing topologies has been investigated for better clarification of the advantages and disadvantages of the proposed inverters.

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A GaN based doubly grounded, reduced capacitance transformer-less split phase photovoltaic inverter with active power decoupling

Cited by 14 publications

References 31 publications

GaN‐based split phase transformer‐less PV inverter with auxiliary ZVT circuit

GaN‐based split phase transformer‐less PV inverter with auxiliary ZVT circuit

Active Power Decoupling Topology for Single Phase Bridge Inverter based on Buck-Boost Convertor

Flying‐inductor‐cell based inverters for single‐phase transformerless PV applications

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