Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression

Li, Wuhua; Gu, Yunjie; Cui, Wenfeng; He, Xiangning; Xia, Changliang

doi:10.1109/tie.2015.2399278

Cited by 548 publications

(222 citation statements)

References 67 publications

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“…For PV application, extensively unipolar PWM modulation scheme is utilized in which CMV (Vdc/2) with high frequency is connected to the PV panels. The presence of non-negligible leakage current is considered a drawback in this technique due to the parasitic capacitance of PV panel [46]. To eliminate leakage current, the bipolar PWM modulation scheme is used [47,48].…”

Section: H-bridge Based Inverter Structuresmentioning

confidence: 99%

“…The proposed design shows the dominance of H5 topology based on enhanced SiC, correlating silicon (Si)-based counterparts and non-optimized with respect to energy production. This converter is based on the succeeding features [46,54,55].…”

Section: H5 Inverter (Sma)mentioning

confidence: 99%

“…The efficiency of H5 and REFU is to some extent higher in comparison to FB-DCBP and HERIC. H5 and REFU has only one switch that operate on high switching frequency while two switches are operated with high frequency in case of FB-DCBP and HERIC converters [43,46,56].…”

Section: Fb-derived Inverter Topologies: An Overviewmentioning

confidence: 99%

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A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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Abstract:The research significance of various scientific aspects of photovoltaic (PV) systems has increased over the past decade. Grid-tied inverters the vital elements for the effective interface of Renewable Energy Resources (RER) and utility in the distributed generation system. Currently, Single-Phase Transformerless Grid-Connected Photovoltaic (SPTG-CPV) inverters (1-10 kW) are undergoing further developments, with new designs, and interest of the solar market. In comparison to the transformer (TR) Galvanic Isolation (GI)-based inverters, its advantageous features are lower cost, lighter weight, smaller volume, higher efficiency, and less complexity. In this paper, a review of SPTG-CPV inverters has been carried out. The basic operational principles of all SPTG-CPV inverters are presented in details for positive, negative, and zero cycles. A comprehensive analysis of each topology has been deliberated. A comparative assessment is also performed based on weaknesses, strengths, component ratings, efficiency, total harmonic distortion (THD), semiconductor device losses, and leakage current of various SPTG-CPV inverters schemes. Typical PV inverter structures and control schemes for grid connected three-phase system and single-phase systems are also discussed, described, and reviewed. Comparison of various industrial grids-connected PV inverters is also performed. Loss analysis is also performed for various topologies at 1 kW. Selection of appropriate topologies for their particular application is thoroughly presented. Then, discussion and forthcoming progress are emphasized. Lastly, the conclusions are presented. More than 100 research publications on the topic of SPTG-CPV inverter topologies, configurations, and control schematics along with the recent developments are thoroughly reviewed and classified for quick reference.

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Section: H-bridge Based Inverter Structuresmentioning

confidence: 99%

Section: H5 Inverter (Sma)mentioning

confidence: 99%

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A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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“…But they are limited to three-level inverters [4]- [8]. On the other hand, the multilevel inverters can decrease the voltage stress of dv/dt on switches and increase the output waveform quality [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

Guo

Jia

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Leakage current reduction is one of the important issues for the transformelress PV systems. In this paper, the transformerless single-phase cascaded H-bridge PV inverter is investigated. The common mode model for the cascaded H4 inverter is analyzed. And the reason why the conventional cascade H4 inverter fails to reduce the leakage current is clarified. In order to solve the problem, a new cascaded H5 inverter is proposed to solve the leakage current issue. Finally, the experimental results are presented to verify the effectiveness of the proposed topology with the leakage current reduction for the singlephase transformerless PV systems.

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“…To suppress the leakage current, new freewheeling paths are constructed to separate the PV array from the grid [2], [9]- [19]. According to the position of freewheeling switches, the topologies can be divided into the DC bypass ones [9]- [12] and the AC bypass ones [2], [13]- [19].…”

Section: Introductionmentioning

confidence: 99%

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

Deng¹,

Sun²,

Yang³

et al. 2016

Journal of Power Electronics

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The full-bridge inverter, widely used for single-phase photovoltaic grid-connected applications, presents a leakage current issue. Therefore, an AC bypass branch is introduced to overcome this challenge. Nevertheless, existing modulation strategies entail drawbacks that should be addressed. One is the zero-crossing distortion (ZCD) of the AC current caused by neglecting the AC filter inductor voltage. Another is that the system cannot deliver reactive power because the AC bypass branch switches at the power frequency. To address these problems, this work proposes an optimized hybrid modulation strategy. To reduce ZCD, the phase angle of the inverter output voltage reference is shifted, thereby compensating for the neglected leading angle. To generate the reactive power, the interval of the negative power output is calculated using the power factor. In addition, the freewheeling switch is kept on when power is flowing into the grid and commutates at a high frequency when power is fed back to the DC side. In this manner, the dead-time insertion in the high-frequency switching area is minimized. Finally, the performances of the proposed modulation strategy and traditional strategies are compared on a universal prototype inverter. Experimental results validate the theoretical analysis.

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Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression

Cited by 548 publications

References 67 publications

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

Optimized Hybrid Modulation Strategy for AC Bypass Transformerless Single-Phase Photovoltaic Inverters

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