A non-isolated single stage three-port converter for hybrid microgrid applications

Abstract

AC and DC sub-grids in a hybrid microgrid are connected through interlinking AC-DC bi-directional converter. The storage was connected to either of the AC or DC sub-grids. Because of storage system integration, it requires a more number of power conversions and device count. So, power quality and overall efficiency of the hybrid microgrid system is decrease. On this intend, this paper proposes a new non isolated single stage three port converter (NISSTPC) for microgrid applications. NISSTPC has three bi-directional ports, which are connected to AC and DC sub grids, storage system. Single stage power conversion is possible either side using NISSTPC. Because of this single stage power conversion of NISSTPC the power quality and conversion efficiency of hybrid microgrid system is increase. The validation of proposed NISSTPC using MATLAB/Simulink and results are compared with conventional hybrid microgrids in aspects of power quality, frequency deviation and utilization of storage. From the results, it can be observed that the overall performance of the hybrid microgrid increases with the use of proposed NISSTPC converter