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Four-Port Bidirectional Dual Active Bridge Converter for EVs Fast Charging

This paper presents the modeling of the isolated multiport bidirectional dual active bridge DC-DC Converter to be used in fast charging applications. The proposed topology uses four different full-bridge sections: the first full-bridge is able to manage the PV source, the second full-bridge is connected to a stationary storage system and can operate as either a source or a load, the remaining two full-bridges are able to manage the charging of the battery units up to two vehicles. All ports are connected through a high-frequency multi-winding transformer which allows to create a magnetic node. The analytical model of the four-port bidirectional dual active bridge DC-DC (4P-DAB) Converter is addressed in order to investigate the system behavior and to obtain the control law to manage the power flows between the ports. Switching model of a 100 kVA 4P-DAB Converter has been created in MATLAB/Simulink to validate the analytical model. The modes of operation of the proposed topology is then validated through the Hardware-In-the-Loop (HIL) test bench.