A Multilevel Solid-State Transformer-Based Grid-Connected Solar Photovoltaic Systems

The high-frequency solid-state transformer (SST) is considered as an emerging technology for integrating the solar photovoltaic (PV) with the grid. In this work, a grid-connected solar PV system is first designed by including a solar PV module, multilevel dual active bridge (DAB) based on the SST, three-level neutral point clamp (NPC) inverter, filter, and associated controllers. The newly designed system is implemented in Matlab/SimPowerSystem environment and a prototype is also developed to further validate the design which is implemented using dSPACE MicroLabBox. Both simulation and experimental results confirm the effectiveness of the proposed solar PV system with the enhanced dynamic and steady-state performance.