Research on the dual-terminal ring topology-based dc microgrid system

A dual-terminal ring topology dc microgrid is studied and discussed in this study, the topology includes photovoltaic power generation, supercapacitor system, energy storage system, vehicle-to-grid charger and dc loads, this typical dc microgrid is fully filled with all essential elements. The key equipment is summarised with relative topology and corresponding control strategies. Four operational modes are outlined in grid-connected and stand-alone mode. A relative simulation is undertaken by Matlab/Simulink software packet and three key scenarios are analysed on both steady state and dynamic state, the research results show that the dual-terminal ring topology-based dc grid has advantages on reliability and flexibility.