Analysis of Performances of Single-Phase PV Transformer-Less Inverters for Compliance with the New Standards CEI 0-21and IEEE 1547-2018

The new Italian standard CEI 0-21 allows the choice about single-phase or three-phase connection to the Distribution System Operator (DSO). This applies to Photovoltaic Systems (PVSs) with power up 10 kW. Singlephase connection to the grid is adopted for power below 6kW. Differently, both single-phase connection and three-phase connection are possible in the range [6-10] kW. Single-phase transformer-less DC/AC converters can exhibit some issues about the compliance with safety requirements. As the transformer-less inverters market is becoming more competitive, the aim of this paper is to benchmark some singlephase transformer-less DC/AC converters providing a fair comparison. The performances are evaluated considering leakage current, reactive power handling capability, power quality, filter and power converter rating.