Proposal and Loss Analysis of High-Frequency 3-Phase SiC Integrated Power Converter for Renewable Energy-Battery-Grid Applications

This paper discusses an interlink converter for microgrid application. A high-frequency isolated transformer integrated power converter is proposed for the interlink converter, where the interlink converter is connected between a 3-phase AC grid, BES (battery energy storage) and a DC microgrid. The integrated power converter can remove the DC/DC conversion of BES and therefore cost-down and small size can be achieved. Switching pattern methodology for the proposed circuit is discussed. A 12kW SiC prototype is developed and the experimental results show the validity of the proposed circuit. A simulation analysis was conducted to show the loss breakdown of the proposed circuit.