Analysis of Dual Active Bridge Converter for Solid State Transformer Application using Single-Phase Shift Control Technique

Solid State Transformer (SST) is a popular device in the present scenario. Power electronics-based SST has many advantages over the conventional transformer likewise; high switching frequency, less weight, low losses. It is a multi-stage transformer composed of different stages of converters likewise; rectifier, inverter and dual active bridge (DAB) for the desired output. It has been evident that stand-alone SST is not able to provide a stable output without any control technique. For SST, the DAB DC-DC converter plays an important role; it provides constant power with a better range at higher efficiency and minimizes the number of passive components. The proposed converter consists of eight semiconductor switches that are isolated through a transformer of high-frequency. In this paper, DAB dc-dc converter has been simulated and analyzed in MATLAB Simulink environment as an application of SST. Here, a single-phase shifting technique (SPS) has been used to minimize the large Dc link capacitor for obtaining a stable output voltage.