Power control of a multiport bidirectional DC-DC module for V2G

In the next decade, the rapid development of Electric Vehicles (EVs) and their charging facilities will become an inevitable trend. In order to integrate EVs into the grid efficiently and make full use of the “mobile energy storage” attribute of them, high efficient infrastructures and intelligent control of the interface between EVs and the grid are very important issues. Based on this, a multiport bidirectional DC-DC module (MPBDM) with the advantages of bidirectional power flow, compact control, less passive components and easy extension is proposed in this paper. The topology, operation principle and control strategy of proposed MPBDM are presented in detail with a five-port MPBDM model built in Matlab/Simulink. The simulation results verify that some of the EVs integrated in a MPBDM can be charged while others discharged at the same time so that the individual EV is able to flexibly respond to the power dispatch from system operator through proposed bidirectional power control strategies.

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