Hybrid Microgrid Based on Solid State Transformer

Abstract

Microgrids are the main structures of a new model for electric power systems. These structures allow the participation of distributed generation, electric vehicles, and energy storage in the utility grid. Among the microgrid topologies, the hybrid AC / DC stands out. In this paper, the implementation of a solid state transformer (SST) using the dual active bridge (DAB) structure is used to build up a hybrid microgrid integrating photovoltaic generation, energy storage systems, AC and DC loads. The operation of the hybrid microgrid is analyzed for different scenarios of load and generation. Results show that the proposed SST structure is able to deal with microgrid bidirectional power flow, ensuring DC-links voltage regulation and high quality energy on the point of common coupling despite unbalanced currents on microgrid loads.