Analysis of Input-Series Output-Series Connected Modular Dual Active Bridge Converter for Medium Voltage DC Microgrids

This paper analyzes the input-series output-series (ISOS) connection of dual active bridges (DAB) modules for medium voltage DC microgrids using both centralized and distributed modulators. As a result of this analysis, the voltage distribution between the modules, the soft-switching conditions, and the transferred power as a function of the main design converter parameters are obtained. Finally, experimental results for operation during steady state are presented to validate the analysis.