I. Introduction
DC microgrids have received increasing attention due to the high depth of penetration of renewable energy sources with DC output type such as photovoltaics (PV) and fuel cells, DC loads, and energy storage systems. Moreover, the significant advantages of DC microgrids compared to their AC counterparts in terms of higher efficiency, reliability, and simpler control mechanisms have enhanced their applicability in many critical applications such as aircraft, trains, electric vehicles, naval ships, and telecommunication systems [1]– [3].