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Technical Lecture

Power Factor Correction: CCM, DCM, CRM/BCM Control, Bridgeless

T01.2 - A 10 kV SiC MOSFET based Three-Phase Single-Stage Isolated MVAC/LVDC Converter for Solid State Transformer Applications

Tuesday, March 18, 2025
8:50 AM – 9:10 AM ET
Location: Level Three, A315
The use of higher blocking voltage devices such as the 10 kV SiC MOSFETs have a lot of potential in reducing the system size and complexity while preserving efficiency. In this digest, a single-stage, isolated AC/DC converter using 10 kV SiC MOSFETs, connected to a 4.16 kV grid, aimed at solid state transformer (SST) applications, is introduced. The topology combines the power factor correction (PFC) stage and the DC/DC stage which enables the conversion using only a single 10 kV half-bridge module. Further, the inductors operate in discontinuous conduction mode which results in a simple open loop control for the switches. The converter uses a single medium voltage transformer which streamlines the system complexity. An experimental hardware is built and tested up to 5 kV DC link voltage and a maximum power of 20 kW. A peak efficiency of 98.4% is observed for the laboratory prototype.