IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia 2018)

311 / 2017-12-08 12:13:41

Single Phase integrated Ćuk Transformer-less SiC Inverter for Grid Connected PV Systems

photovoltaic grid-connected inverter，,common mode current,transformer-less inverter

Plenary track > Applications in renewable energy and storage, transportation, industrial drives, and grid power

This paper proposes a new single-phase transformer-less inverter, using the principle of Ćuk converter for grid-connected Photovoltaic(PV) systems. The new inverter has a common ground between the grid and the PV source, which helps to eliminate the leakage current for the grid-connected PV application. Unlike common ground type charge pump based transformer-less inverter, this topology eliminates inrush current and hence reduces the current stress on the components. Further, application of wide bandgap devices, such as SiC MOSFETs allow higher switching frequency to be achieved, and thus reduction of the passive components. A novel switching strategy, proposed here allows current in both directions, positive and negative (to the load/grid or from the load/grid, for reactive loads), making the converter suitable for grid connection (unity power factor), as well as standalone operation with a reactive load.