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

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5 Author(s)
Kerekes, T. ; Inst. of Energy Technol., Aalborg Univ., Aalborg, Denmark ; Teodorescu, R. ; Rodriguez, P. ; Vazquez, G.
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There is a strong trend in the photovoltaic 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 of 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 are demonstrated.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 1 )