Single-Phase Transformer-less Photovoltaic Inverter Featuring Low Common-Mode Voltage Noise Generation Enabled by an AC-decoupling and DC-link Mid-point Clamping Technique

This paper studies a single-phase transformerless photovoltaic (PV) inverter featuring AC-decoupling and midpoint DC-link clamping technique which enables a low common-mode voltage noise generation. This circuit is well-suited for PV residential applications. The characteristics of this circuit topology, the principles of operation, and the main dimensioning equations are described in this paper. Finally, simulation and experimental results are used to verify the characteristics of the studied converter.