Integration of Multiple Energy Storage Sections in Solar PV based HMGs using Multi-Input DAB

For the hybrid microgrid (HMG) fed from solar photovoltaic (PV) system, single battery storage section could prove economical than using individual batteries. This in turn requires high power high efficiency dc-dc converters. This paper proposes an isolated multi-input dual active bridge (MIDAB) based dc-dc converter topology for integrating the multiple batteries section. It provides a high end power transfer along with the capability to distribute the power among different battery storage sections as per the MIDAB modulation indices. The converter has been tested for the configured hybrid DC/AC solar microgrid system capable of operating in both grid-connected and isolated modes. The power management strategy has been modified for efficient power transfer in different operating modes. A simulation model of the proposed MIDAB based solar PV microgrid system has been built on MATLAB to verify the proposed control strategy under various solar radiation level and load conditions.