H6 Transformerless Full-Bridge PV Grid-Tied Inverters

Zhang, Li; Sun, Kai; Xing, Yan; Xing, Mu

doi:10.1109/tpel.2013.2260178

Cited by 324 publications

(128 citation statements)

References 22 publications

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“…Modulation techniques comprising double frequency PWM along with unipolar PWM are applied in H6 topology. Inductive current passing four active switches cause large conductive losses which are a disadvantage in this topology [39,56,62]. Using H6 topology replacing low efficient IGBTs with MOSFET was suggested [63].…”

Section: Refu Invertermentioning

confidence: 99%

“…(0 → + → 0 → − → 0), (b) because of no exchange of reactive power between CPV and L1(2) during zero voltage and in one leg lower frequency switching and boost only when necessary, its efficiency is higher up to 98%; (c) the EMI filtering requirement and the leakage current peaks is lower as has no switching frequency component and only grid frequency component is present [62].…”

Section: Advantagesmentioning

confidence: 99%

“…(0 → + → 0 → − → 0) ; (b) because there is no exchange of reactive power between CPV and L1(2) during zero voltage and losses is reduced as one switch is conducting during active state, its efficiency is higher, up to 98%; (c) the EMI filtering requirement and the leakage current peaks is lower as is constant and is equal to VPV/4 has no switching frequency Figure 19. Schematic diagram of the Conergy NPC inverter [44,62].…”

Section: Advantagesmentioning

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: Refu Invertermentioning

confidence: 99%

Section: Advantagesmentioning

confidence: 99%

Section: Advantagesmentioning

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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“…Many modified topologies based on the bridge-type inverter are proposed to eliminate leakage current by adding devices, which will increase losses. The efficiency results, as compared with other non-isolated grid-connected inverters (H5, HERIC, and H6 [23]), are summarized in Fig. 16.…”

Section: Simulation and Experimental Verificationmentioning

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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“…HERIC topology reaches a η EU = 98.27 % while the the lowest THD corresponds to H6 and no leakage current is obtained in case of NPC topologies. The behaviour of H5, HERIC and H6 topologies is analysed and compared in terms of power losses in [5],…”

Section: Introductionmentioning

confidence: 99%

Robustness evaluation of transformerless PV inverter topologies

Jedtberg

Pigazo

Liserre

2014

2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-Transformerless PV inverter topologies allow the PV inverter size and weight to be reduced while reaching a higher efficiency. The drawbacks of these topologies are that DC current components at the grid side must be cancelled by means of the employed controller and the number of power devices required to avoid currents through the parasitic capacitor of the PV generator increases.These topologies have been analysed in the literature but physical variations of power devices due to the manufacturing process have not been taken into account. This manuscript analyses the effect of such physical variations on the performance of three commonly employed transformerless topologies: H5, HERIC and Half-Bridge NPC. The impact of the parameter variations is compared regarding the efficiencies at different power levels, the European Efficiency and the DC current components. The results indicate that physical variations lead to different behaviors regarding the robustness of the analysed topologies. By means of statistical analyses these differences are obtained and exposed.

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H6 Transformerless Full-Bridge PV Grid-Tied Inverters

Cited by 324 publications

References 22 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

Robustness evaluation of transformerless PV inverter topologies

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