Solid-State Transformer Modeling for Analyzing its Application in Distribution Grids

Inhalt:
This work describes the modeling of a solid-state transformer (SST) in DIgSilent Power Factory. As various models and tools are used for SST or converter design in general, this work provides the basis for studying SST applications in realistic grid environments. The model is based on the dynamic average technique and is compatible with three-phase, four-wire technology on low-voltage side. It describes the controlled bidirectional power flow for symmetric and asymmetric load situations, as well as for faults in the external grid. SST functionality and the performance of its control have been analyzed and compared with standard low frequency transformers (LFT).