POWER QUALITY IMPROVEMENTAND DISTRIBUTED CONTROL IN HYBRID AC/DC USING MICRO GRIDS

Abstract

Combining the DC microgrid and the dominated AC system forms the scenario hybrid AC/DC microgrid, which would be, in concept, the presence of both DC and AC microgrids with sources, storages, loads and appropriate interlinking converters (ICs) tied between them. Hybrid AC/DC microgrid has been becoming a popular concept to provide an effective solution for unlimited large-scale integration of various DGs and distributed storages (DSs) because of its higher efficiency and better compatibility. This paper proposes a distributed control strategy that considers several source characteristics to achieve reliable and efficient operation of a hybrid ac/dc micro grid.The hierarchical control scheme for standalone DC microgrids, the fully decentralized control for hybrid AC/DC microgrids, the distributed control for hybrid AC/DC/DS microgrids and power quality improvement for hybrid AC/DC microgrid have been verified. The proposed hybrid ac/dc microgrid is composed of converters and distributed generation units that include renewable energy sources (RESs) and energy storage systems (ESSs). The proposed control strategy is verified in various scenarios experimentally and by simulation.