SiC-based Isolated Three-port DC-DC Converter Implementation for MV Microgrid Applications

Integrating microgrids or distributed energy sources into a utility grid requires a meticulous control design. The energy management between the source and the load should be rapidly and carefully controlled. Solid State Transformer (SST) and Power Conditioning System (PCS) are emerging technologies with the development of medium voltage (MV) Silicon Carbide (SiC) power semiconductor devices, which offer high-frequency isolation between MV grids, distributed energy storage, Electric Vehicle (EV) charging, etc. Besides, power flow and power factor can be easily controlled. This paper presents three-port Triple Active Bridge (TAB) applications for micro-grid integration. The system consists of three power conversion stages: AC to DC, DC to DC, and DC to AC. The front-end converters control the DC voltage, and the power flow is dispatched by controlling the TAB. Verification of the system at 24.5 kV DC is tested with the NovaCor, Real-Time Digital Simulator (RTDS).