Grid Stability Enhancement by a High Voltage SiC MOSFET-Based Asynchronous Microgrid Power Conditioning System

Abstract

Asynchronous microgrid (ASMG) is a microgrid concept where the ac microgrid is connected to a utility grid through a power conditioning system (PCS). The development of high voltage (HV, >3.3 kV) silicon carbide (SiC) MOSFET technology promotes the implementation of ASMG PCS converters. However, the system-level benefits from SiC MOSFETs have not been well studied for this application. This paper discusses ASMG system stability enhancement resulting from HV SiC MOSFET-based PCS converters. HV SiC MOSFET-based PCS converters can achieve high control frequency, which can benefit the potential harmonic instability caused by the digital control delay. A detailed theoretical analysis is provided, and experimental results for the stability enhancement capability are demonstrated on a converter-based hardware testbed (HTB).