A New High-Efficiency Single-Phase Transformerless PV Inverter Topology

Kerekes, Tamás; Teodorescu, Remus; Rodríguez, Pedro; Vázquez, G.; Aldabas, E.

doi:10.1109/tie.2009.2024092

Cited by 678 publications

(273 citation statements)

References 10 publications

(7 reference statements)

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“…NPC was first introduced by Takahashi et al in 1981 [66]. In comparison to the two-level FB inverter, NPC has lower switching stress as well as dV/dt.…”

Section: Npc Based Inverter Structuresmentioning

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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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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“…NPC was first introduced by Takahashi et al in 1981 [66]. In comparison to the two-level FB inverter, NPC has lower switching stress as well as dV/dt.…”

Section: Npc Based Inverter Structuresmentioning

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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“…As we know, the typical H-bridge inverter with bipolar modulation or unipolar modulation is not suitable for the transformerless PV system application due to its low efficiency or high ground current [10], and the extensive evaluation results have been reported in [2,3]. Therefore, it is not duplicated here.…”

Section: Performance Evaluationmentioning

confidence: 99%

New inverter topology for ground current suppression in transformerless photovoltaic system application

Guo

Wang

et al. 2014

J. Mod. Power Syst. Clean Energy

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An interesting inverter topology is proposed in this paper. It is similar to the typical three-phase full bridge inverter from the topology point of view, but smartly designed for the ground current reduction in single-phase photovoltaic (PV) inverter applications. Theoretical analysis is conducted to clarify the operation mechanism of the proposed topology. Performance evaluation is carried out to verify the effectiveness of the proposed topology for the ground current suppression.

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“…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]. In H5 topology, an active switch is introduced to the DC bus to decouple the PV module [10].…”

Section: Introductionmentioning

confidence: 99%

“…AC bypass topologies realize new freewheeling paths by adding a bidirectional switch between the midpoints of two legs. In accordance with the aforementioned principle, a highly efficient and reliable inverter concept (HERIC) topology [15], an H-bridge zero voltage rectifier (HB-ZVR) topology [13], a full-bridge inverter topology with a constant common-mode voltage (FB-CCV) [14], and a HERIC-based clamping topology [2] are proposed. The clamping methods are similar to the DC topologies.…”

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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A New High-Efficiency Single-Phase Transformerless PV Inverter Topology

Cited by 678 publications

References 10 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

New inverter topology for ground current suppression in transformerless photovoltaic system application

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

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