High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method

Ji, Baojian; Wang, Jianhua; Zhao, Jianfeng

doi:10.1109/tie.2012.2225391

Cited by 248 publications

(93 citation statements)

References 26 publications

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“…The leakage current is completely eliminated through some topologies by fixing the CMV to half of the DC-link using clamping method. Figure 2 presents a categorization of transformerless inverter topologies [10,[25][26][27][28][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

“…Half Bridge Based Full Bridge Based Active NPC Topology [31] Conergy NPC Topology [34] Flying Capacitor Topology [33] Diode Clamped Topology [32] OH5 topology [35] Passive Clamped H6 Topology [36] HBZVR Topology [37] HBZVR-D Topology [38] HERIC Clamped Topology [39] DC Side Decoupling AC Side Decoupling H5 Topology [40] H6 Topology [26,41] Improved H6 Topology [27,42] HERIC Topology [25] H6-I Topology [26] H6-II Topology [27] H6-III Topology [28] H6-IV Topology [10] Figure 2. Transformerless inverter topologies: A classification overview.…”

Section: Classification Of Transformerless Inverter Topologiesmentioning

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: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

Section: Classification Of Transformerless Inverter Topologiesmentioning

confidence: 99%

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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“…In accordance with the mechanism for unbalancing input voltage generation [19], [20], the capacitor voltage feed forward scheme is introduced (Fig. 8).As shown in equation (9), the unbalanced voltage is related with the grid current and, to a certain extent, has a proportional relationship with the sum of the two capacitances. As indicated by the input capacitor voltage deviation, the current loop not only regulates the inductor current but also solves the voltage unbalancing problem (Fig.…”

Section: Control Strategymentioning

confidence: 99%

A Dual Buck Three-Level PV Grid-Connected Inverter

Ji¹,

Hong²,

Wang³

et al. 2015

Journal of Power Electronics

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The use of a PV grid-connected inverter with non-isolated topology and without a transformer is good for improving conversion efficiency; however, this inverter has become increasingly complicated for eliminating leakage current. To simplify the complicated architecture of traditional three-level dual buck inverters, a new dual Buck three-level PV grid-connected inverter topology is proposed. In the proposed topology, the voltage on the grounding stray capacitor is clamped by large input capacitors and is equal to half of the bus voltage; thus, leakage current can be eliminated. Unlike in the traditional topology, the current in the proposed topology passes through few elements and does not flow through the body diodes of MOSFET switches, resulting in increased efficiency. Additionally, a multi-loop control method that includes voltage-balancing control is proposed and analyzed. Both simulation and experimental results are demonstrated to verify the proposed structure and control method.

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“…One of the major characteristics favoring PV over other renewable resources is the possibility to be employed in low power plants, easily integrated in the environment and directly connected to the low voltage distribution line. Many types of single-phase PV inverters were developed, both in industry and in academia [1]- [5]. Transformerless inverters are those that can achieve the highest efficiency levels, but their use in grid-connected systems is not straightforward.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of a Three-Level ANPC Photovoltaic Grid-Connected Inverter With 650-V SiC Devices and Optimized PWM

Barater

Concari

Buticchi

et al. 2016

IEEE Trans. on Ind. Applicat.

128

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(2016) Performance evaluation of a 3-level ANPC photovoltaic grid-connected inverter with 650V SiC devices and optimized PWM. IEEE Transactions on Industry Applications, 52 (2). pp. 2475 -2485 . ISSN 1939 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/33387/1/Performance%20Evaluation%20of%20a%203-Level %20ANPC%20Photovoltaic%20Grid-Connected%20Inverter%20with%20650V%20SiC %20Devices%20and%20Optimized%20PWM.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract-Photovoltaic (PV) energy conversion has been on the spotlight of scientific research on renewable energy for several years. In recent years the bulk of the research on PV has focused on transformerless grid-connected inverters, more efficient than traditional line transformer-based ones, but more critical from a power quality point of view, especially in terms of ground leakage current. Neutral point clamped (NPC) inverters have recently gained interest due to their intrinsically low ground leakage current and high efficiency, especially for MOSFET-based topologies. This paper presents an active NPC (ANPC) topology equipped with 650 V SiC MOSFETs, with a new modulation strategy that allows to reap the benefits of the wide-bandgap devices. An efficiency improvement is obtained due to the parallel operation of two devices during the freewheeling intervals. Simulations and experimental results confirm the effectiveness of the proposed converter.

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High-Efficiency Single-Phase Transformerless PV H6 Inverter With Hybrid Modulation Method

Cited by 248 publications

References 26 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

A Dual Buck Three-Level PV Grid-Connected Inverter

Performance Evaluation of a Three-Level ANPC Photovoltaic Grid-Connected Inverter With 650-V SiC Devices and Optimized PWM

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