Modular Dual Active Bridge Converter for EV Extreme-Fast Charger in MV Networks

This paper presents a new electric vehicle (EV) integration topology for medium voltage (MV) networks, addressing the challenge of prolonged charging times. The solution leverages the innovative integration of dual active bridge (DAB) converters arranged in an input-series output-parallel (ISOP) configuration. The power distribution infrastructure includes a modular DAB design in an ISOP configuration to increase power scalability. One of the benefits of ISOP configuration is that it highlights a significant reduction in the number of DAB converters required compared to traditional topologies. This streamlined approach not only simplifies the system architecture but also enhances efficiency and decreases the overall cost, making it a compelling option for MV network connection. It further explains the new control approach for ISOP configuration of DAB in support of efficient input voltage sharing (IVS) and output current sharing (OCS) control for controlling EV charging current. The MATLAB-based simulation validates the topology, demonstrating successful control of the 600V input voltage for each DAB connected to the 2.4 kV MVDC link. This system uses inexpensive and readily available SiC 750V MOSFETs, thus improving the practicality of the system. These results reinforce the viability of the topology and control approach, establishing their relevance for extreme-fast EV charging and industrial deployment.