Grid-Connected Three Phase Hybrid AC to DC Microgrid Controlling System using Bidirectional Converter

Abstract: Micro  grids are  emerging  as  one  of  the  promising solutions to  integrate  various  types  of  distributed  renewable energy sources with the utility grid. Though the existing grids are AC grids, today’s electrical loads comprising of power electronic based equipment and distributed renewable energy  generation make DC micro grids  more  attractive.  However, an individual AC micro grid and DC micro  grid requires multiple conversions of power at the user end for DC loads and AC loads respectively, resulting in less efficient system. Thus, hybrid AC/DC micro grid seems to be the best solution to avoid substantial energy losses in multiple   conversions. However,  there   are   several   technical challenges  in the implementation  of  hybrid  AC/DC  micro  grid, which  need  to  be addressed. This paper presents  an  overview  of hybrid AC/DC micro grid and discusses the important key issues and challenges to be overcome for its practical implementation.

Keywords: Micro  grids, AC, DC