A Tunable Power Sharing Control Scheme for the Output-Series DAB DC–DC System With Independent or Common Input Terminals

To connect the low voltage energy storage source equipment and the medium voltage dc (MVdc) bus, the output-series dual-active-bridge (OS-DAB) dc-dc converter system with independent or common input terminals becomes a promising option. For the OS-DAB dc-dc converter system, this letter proposes a simple tunable power sharing control (TPSC) strategy to maintain the voltage of MVdc bus, manage power sharing ratio for each energy storage system. The proposed strategy allows energy storage equipment hot swap as well as converter system black start. Experimental results verify the analysis in this letter and the excellent performance of proposed TPSC strategy.