A 13.8 kV, 100 kVA Multi-functional MMC-Based Asynchronous Microgrid Power Conditioning System with 10 kV SiC MOSFETs

Medium voltage (MV) asynchronous microgrids have numerous unique benefits over regular synchronous MV ac microgrids. This paper focuses on a MV transformer less asynchronous microgrids power conditioning system (PCS) using 10 kV SiC MOSFETs. The benefits of a 10 kV SiC MOSFET based PCS include simplified topology, higher control bandwidth, and hence more advanced control functions, although it is still challenging to apply 10 kV SiC MOSFETs with their associated much faster switching speed in MV systems. A modular design approach is adopted in the design and implementation of the PCS as well as its controller. The sophisticated grid functions of the asynchronous microgrid PCS are supported by a hierarchical modular control system. A 100 kVA back-to-back transformer less PCS for a 13.8 kV MV grid is developed and tested at rated voltage and power.