Preliminary Design of Solid State Transformer Application for Power Distribution System in Indonesia

Power converters are widely used in power systems such as inverters for solar power generation or rectifiers in electric vehicle battery chargers. In addition, AC-AC converters are also used in wind power plants to stabilize the power output. Solid state transformer (SST) is a power transformer consisting of a high frequency transformer, power converter and control circuit, which is designed to provide a high level of control flexibility. In the future, this control flexibility can be developed so that SST has the ability to solve the above problems. This study project the potential application of SST for power distribution system at PT. PLN (Persero) and designed the SST topology based on the expected functions according to the available literature. The SST topology is selected based on the capability to perform the expected functions and the switching components are selected based on their commercially available ratings. Based on these considerations, a three-stage SST configuration with h-bridge module and dual active bridge was chosen using the highest voltage rating available of IGBT. The output of this study is potential application of SST at power distribution system along with its preliminary design.