A bidirectional DC/DC converter for renewable energy source-fed EV charging stations with enhanced DC link voltage and ripple frequency management
I. William Christopher, A. Dominic Savio, C. Balaji, V. Ramakrishnan, Petr Moldřík, Radomír Goňo, Petr Bernat, R Narayanamoorthi
Abstract
• The proposed bidirectional DC/DC converter facilitates efficient bidirectional power flow between electric vehicles (EVs) and renewable energy sources (RES) fed charging stations, thereby optimizing power utilization and reducing grid power pollution. • The converter features two identical Zero Voltage Transition (ZVT) cells integrated with a traditional three-level topology, reducing DC link voltage stress and doubling the inductor current ripple frequency relative to the converter's switching frequency. This design supports both buck and boost operating modes. • The performance of the proposed converter is validated through comprehensive MATLAB/Simulink simulations and experimental setups, demonstrating its effectiveness and reliability in real-world applications for EV charging stations. The amount of electricity that the grid must supply has increased as the number of electric vehicles (EVs) has increased. The best way to minimize power pollution between the automobile and the grid is to use an EV charging station to establish a bidirectional connection with an energy storage unit (ESU). This paper proposes a bidirectional DC/DC converter for battery available at the renewable energy sources (RES) fed charging station. This bidirectional DC-DC converter has important advantages such as dc link voltage stress reduction and the ripple frequency of inductor current is two times of the converter's switching frequency. The proposed converter consists of two identical Zero Voltage Transition (ZVT) cells and each cell includes a capacitor, two resonant inductors and a supplementary switch which is combined with the traditional three level topology that enables both buck and boost operating modes. The simulation-based analysis has been done using MATLAB/Simulink. The simulation results have been verified with the help of experimental setup is presented for the converter module for validating the charging station.