Control strategy for modular Dual Active Bridge input series output parallel

This paper is focused on a power converter system based on Dual Active Bridge modules input-series and output-parallel connected (ISOP). Converter modularization is a promising technique from a practical point of view, providing higher input voltage, lower cost and better performance. On the other hand, Dual Active Bridge converter is an interesting topology in bidirectional applications. However, the ISOP connection of DAB converters implies some important control issues, since the connection of independent modules does not ensure a proper distribution of the power, voltages and currents. In this paper a dynamic study of the DAB converter with ISOP connection is done and a control strategy is proposed to warranty a stable operation and an adequate input voltage distribution.