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Transformerless Inverter for Single-Phase Photovoltaic Systems

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4 Author(s)
Gonzalez, Roberto ; Dpto. Ingenier a Electrica y Electronica, Univ. Publica de Navarra, Pamplona ; Lopez, J. ; Sanchis, P. ; Marroyo, L.

When no transformer is used in a grid-connected photovoltaic (PV) system, a galvanic connection between the grid and the PV array exists. In these conditions, dangerous leakage currents (common-mode currents) can appear through the stray capacitance between the PV array and the ground. In order to avoid these leakage currents, different inverter topologies that generate no varying common-mode voltages, such as the half-bridge and the bipolar pulsewidth modulation (PWM) full-bridge topologies, have been proposed. The need of a high-input voltage represents an important drawback of the half-bridge. The bipolar PWM full bridge requires a lower input voltage but exhibits a low efficiency. This letter proposes a new high-efficiency topology that generates no varying common-mode voltage and requires the same low-input voltage as the bipolar PWM full bridge. The proposed topology has been verified in a 5-kW prototype with satisfactory results

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Power Electronics, IEEE Transactions on  (Volume:22 ,  Issue: 2 )