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A new high-efficiency single-phase transformerless PV inverter topology

A new high-efficiency single-phase transformerless PV inverter topology,10.1109/TIE.2009.2024092,IEEE Transactions on Industrial Electronics,Tamás Ker

A new high-efficiency single-phase transformerless PV inverter topology   (Citations: 14)
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There is a strong trend in the photovoltaic (PV) inverter technology to use transformerless topologies in order to acquire higher efficiencies combining with very low ground leakage current. In this paper a new topology, based on the H- Bridge with a new AC bypass circuit consisting in a diode rectifier and a switch with clamping to the DC midpoint is proposed. The topology is simulated and experimentally validated and a comparison with other existing topologies is performed. High conversion efficiency and low leakage current is demonstrated.
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    • ...An isolation ac line-frequency transformer can be employed, but suffers the big converter volume per se. A high-frequency isolation transformer, however, poses a challenge of topology design. Ref [18-20] propose multi-switches on...

    Dong Donget al. Passive filter topology study of single-phase ac-dc converters for DC ...

    • ...However, the conversion stages decrease the efficiency and make the system more complex [4], [5]...

    Fabricio Bradaschiaet al. Modulation for Three-Phase Transformerless Z-Source Inverter to Reduce...

    • ...Another solution for generating the zero voltage state can be done using a bidirectional switch made of one IGBT and one diode-bridge [109]...

    F. Blaabjerget al. Power electronics - key technology for renewable energy systems

    • ...T he worldwide-installed Photovoltaic (PV) power capacity exhibits a nearly exponential increase and the majority of PV systems are used to supply the generated energy into the electric grid [1, 2]. A general block diagram of a grid-connected PV system is illustrated in Fig. 1, using a DC/AC inverter in order to interface the energy produced by the PV array into the electric grid...
    • ...Metrics such as the power conversion efficiency and the “European efficiency” are used to evaluate the performance of the designed PV inverter [2, 3]...
    • ...C ompared to the grid-connected PV inverters that have galvanic isolation (either on the DC, or the AC side), the transformerless PV inverters have the advantages of lower cost, higher efficiency, smaller size and lighter weight [2]...
    • ...The H-bridge, single-phase with DC decoupling, Refu Solar, H5, HERIC, NPC, Conergy, H-bridge zero vector rectifier, three-phase full-bridge and full-bridge with split capacitor topologies are widely applied in order to built the power section of transformerless PV inverters since they obtain the highest efficiency [2-5]...
    • ...The leakage ground current problem is significant in the case of the full-bridge inverter (both singleand three-phase) [2, 16]...
    • ... by up to 5% at light load and high DC input voltage [17], due to the domination of the control unit and switching power losses in that area), the DC input voltage amplitude (typically it is reduced by 0.3%-1% per 150 V, depending on the input power level) and the type and operational characteristics (conducting and switching) of the components (semiconductors, magnetic elements and capacitors), which are used to build the PV inverter [2, ...

    Eftichios Koutrouliset al. Design optimization of grid-connected PV inverters

    • ...inverter has drawn many attentions for the single-phase transformerless PV inverter because of its higher efficiency, smaller size, and leakage current reduction [1-5]...
    • ...It can avoid high frequency voltage variation at the DC bus terminal; Therefore, the leakage current through the parasitic capacitance of the PV panels can be reduced [1], [2]...

    Yaow-Ming Chenet al. H5™ inverter with constant-frequency asynchronous sigma-delta modulati...

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