Medium Voltage Single-stage Single Active Bridge based Solid State Transformer

A novel soft-switching medium voltage single active bridge based solid state transformer (SABSST) has been presented in this paper. AC/AC conversion has been achieved using only two controllable high frequency medium voltage power electronic switches. The converter has been modeled and a closed loop control system has been designed to regulate the output voltage by varying switching frequency. Simulation results validate the effectiveness of the designed control system. A medium voltage protoype SABSST has been developed with an input voltage of 3600V and an output voltage of 98V. Salient features of the SABSST are demonstrated in this paper.