Concept of Energy Management System for the Fast EV Charger with Battery Storage

This article presents a concept of the control algorithm for an advanced fast charging system for electric vehicles with battery energy storage. Such a system consists of an AC/DC grid converter, isolated DC/DC converters for slow and fast vehicle charging, and a non-isolated DC/DC converter ensuring bi-directional energy flow between the storage and other converters of the system. All the components are connected via a bidirectional DC bus. They have to be controlled by the main unit due to the complex structure of the system. Several possible operating modes and control signals are analyzed, ensuring the safe and correct operation of the system, and the following converters are proposed. In addition to the analysis, simulation results are presented in the study to confirm the proper system operation.