DC microgrid management using power electronics converters

Grid-interfacing converter systems with enhanced voltage quality are proposed for dc microgrid applications in this paper. By adapting the conventional series-parallel structure, a group of grid-interfacing system topologies and their control for the purpose of interfacing local generation/dc microgrid to the grid, or interconnecting dc microgrids. First step includes the integration of required number and type of converters, which connects the common DC bus with distributed energy resources (DERs), utility grid and end user loads. Two types of DERs, such as solar energy storage and doubly fed induction generator (DFIG) based wind power generator, along side the utility grid are connected to the distribution bus. The simulation has been carried out for studying the stability of various system parameters with load variation at the consumer end. This study shows that the results from the simulation model widely correspond to the expected values. An experimental test bed is created to examine the validity of the dc mocrogrid system.