Design and demonstration of a 3.6kV–120V/10KVA solid state transformer for smart grid application

Solid state transformer (SST) has been regarded as one of the most emerging technologies for traction system and smart grid application. This paper presents the system design and performance demonstration of a high voltage SST lab prototype, which works as the active grid interface in the smart grid architecture. Specifically, the designs of the key components of the system, including both power stage and controller platform, are presented. In addition, the integration issues of SST with DC microgrid are highlighted. Lastly, tests under different scenarios are conducted to verify the following advanced features of the presented SST technology: (1) VAR compensation; (2) Voltage regulation; (3) Source voltage sag operation; (4) Microgrid integration.