Notice of Violation of IEEE Publication Principles: Single-Phase Common-Ground-Type Transformerless PV Grid-Connected Inverters

Liao, Zhiling; Cao, Chenchen; Qiu, Diancheng; Xu, Changbo

doi:10.1109/access.2019.2910577

Cited by 15 publications

(13 citation statements)

References 20 publications

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“…In addition to the system evalution presented in brevious section, the system performance is evaluated when considering boost converter losses and HERIC inverter losses and consequently the system efficiency is evaluated in this section. The efficiency of the system 'η' is defined as: (10) The main significant losses are the conduction and switching losses in HERIC inverter, boost converter switch and diode. The switch and diode conduction losses can be calculated using the following equations:…”

Section: Efficiency Of the Proposed Systemmentioning

confidence: 99%

“…Therefore, the changes of the common mode voltage must be minimized to reduce the leakage current. Transformerless inverters are the best solution to overcome the problem of leakage current as listed in the literature [5][6][7][8][9][10][11][12][13][14][15]. Transformerless inverters have recently become more popular owing to its small system volume, low weight and low cost.…”

Section: Introductionmentioning

confidence: 99%

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A high performance grid connected PV system based on HERIC transformerless inverter

Hendawi

2020

IJEECS

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<p>This paper presents an effective single phase grid connected photovoltaic PV system based on High Efficiency and Reliable Inverter Concept HERIC transformerless inverter. dc-dc boost converter controlled by incremental conductance IC maximum power point tracker MPPT is employed to achieve the maximum extraction power of the PV panels. Proportional integral PI controller controls the output voltage of the boost converter to meet the utility grid requirements. LCL filter is utilized to keep the inverter voltage very close to sinusoidal shape. Employing the HERIC transformerless inverter reduces significantly the ground leakage current beyond safe limits. Semiconductors losses are studied to investigate the efficiency of the proposed system at different insolation levels. Simulation results verify the high performance of the proposed system when considering leakage current and system efficiency.</p>

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Section: Efficiency Of the Proposed Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A high performance grid connected PV system based on HERIC transformerless inverter

Hendawi

2020

IJEECS

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“…The more level, the more complex in the control circuit, the more difficult it is for scientific applications to perform. Also presented in [38] is a common mode grounding topology similar to the efficient DC bus. However, it requires a two-stage transfer of energy, which increases the loss.…”

Section: Fig7 Modified Z-source Inverter Topologymentioning

confidence: 99%

“…Few common mode grounding topologies in single phase transformer-less inverters are shown in figure (13). (c) Fig.13.Single-phase common mode transformer less inverter (a) Topology in [36] (b) Topology in [37] (c) Topology in [38] In perspective of the constraints in the above topologies [36], [37] & [38], a novel flying capacitor topology is proposed in [39] with charging and discharge schemes. This topology obtained a new transformer-less inverter family for PV grid integration, where the utility grid's neutral point is immediately attached to the solar PV array's negative terminal.…”

Section: Fig7 Modified Z-source Inverter Topologymentioning

confidence: 99%

Technological Developments in Direct Grid Connected Power Converters for Solar PV Power Plants

Kumar¹,

Ganesh²

2019

IJEAT

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Most of the countries in the world are concentrating on renewable energy generation, due to day-day increase in population increasing the energy demand, also to make their environment sustainable. With the many of features, use of megawatts rating solar photovoltaic (PV) power plants are becoming more popular for upgrading the existing power generation throughout the world. Moreover, among the existing renewable energy generations, solar power is the primary choice to meet the rapidly increasing demands; since solar PV plant installing time is relatively quick, say about in 3- 4 months, compared to conventional (thermal, hydro & diesel) plants which may require about 3-4 years. The low voltage (270‒700V) power converters require a filter and a step-up transformer for interconnecting the local grids with solar PV power plants. The advances in power converters without transformers and filters have recently become more attractive for solar PV power plants connected directly to grid. The study of this article describes the essential requirement and the technological developments in the design of power electronics converters, together with their modulation schemes to integrate solar power directly with standard power grid. This article, review ongoing research activities and the probable directions for the future research in developing inverters for cost-efficient grid connected solar PV plants

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“…Another CGT topology presented in [24], yields in zero leakage current. It consists of five switches, one flying capacitor and a single inductor with no voltage boosting ability.…”

Section: Introductionmentioning

confidence: 99%

Multilevel common‐ground inverter with voltage boosting for PV applications

Kumari

Verma

Sandeep

et al. 2020

IET Power Electronics

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Nowadays, transformer-less Photovoltaic-based grid-connected inverters are more popular in renewable energy application due to their reduced size, cost, and high efficiency. However, the absence of galvanic isolation leads to the flow of leakage current in such system hindering personal safety, and deteriorating power quality. Therefore, this paper presents a five-level transformer-less inverter topology for PV applications with less component count and reduced complexity. The proposed inverter topology completely eliminates the common mode leakage current. Besides, the proposed topology has an inherent capability to boost the voltage without using any magnetic component or boosting circuit, and is based on the principle of switched/auxiliary capacitor. The proposed topology do not have any limitation of modulation index since the auxiliary capacitors are naturally balanced, hence less complex or no dedicated control scheme is required for balancing/regulating the auxiliary capacitor voltages. In order to verify the performance of the proposed inverter topology, a laboratory prototype is developed which confirms the operation, and feasibility of the proposed inverter. Results depicting the output voltage, load current, and voltage across the auxiliary capacitor are presented for various operating conditions. Further, simulation results depicting the leakage current in the proposed, H5, and H6 topologies are included. Finally, a quantitative comparison study is done, highlighting the benefits of the proposed inverter topology regarding boosted voltage, elimination of leakage current, and reduced component count. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Notice of Violation of IEEE Publication Principles: Single-Phase Common-Ground-Type Transformerless PV Grid-Connected Inverters

Cited by 15 publications

References 20 publications

A high performance grid connected PV system based on HERIC transformerless inverter

A high performance grid connected PV system based on HERIC transformerless inverter

Technological Developments in Direct Grid Connected Power Converters for Solar PV Power Plants

Multilevel common‐ground inverter with voltage boosting for PV applications

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