An Optimal Power Management System Based on Load Demand and Resources Availability for PV Fed DC-Microgrid with Power-Sharing among Multiple Nanogrids

The abundant solar energy we receive needs to be efficiently utilized for the green environment and benefit of mankind. This paper proposes a simple and optimal power management system (PMS) for DC-microgrid (DCMG). The system uses a power switching circuit which interfaces the PV-array, DC-load, and the energy storage system (ESS) in each nanogrid (NG) of the DCMG. The overall DCMG consists of a cluster of four NGs linked through a common DC-bus with a single ESS. The proposed method not only offers a PMS at each NG, it also incorporates the power-sharing capability among the NGs. The PMS makes effective use of the power by considering the load demands for the power and the resources availability to the load at each NG, thus forming the merit. The proposed method offers simplicity in the structure and control of the system.