Three-Phase AC/DC Converter fed Two Parallel Interleaved DC-DC Converters for Fast Charging Applications with Improved Power Quality

In this paper, a novel grid-interactive, off-board, three-phase EV charger and its control strategy are presented with the potential to achieve desired power factor. In the proposed configuration, the dual-stage (AC-DC and DC-DC) integrated charger is composed of a three-phase AC/DC converter and the two-phase parallel interleaved DC-DC converter sharing the same dc-link. The AC-DC converter interface between input mains and the dc-link. The parallel interleaved DC-DC converter is connected between the dc-link and the EV battery.The entire system is designed for a 3-ϕ, 10 kW rating with a broad range DC output voltage of 200–400V for EV batteries and 400V rms phase–to–phase, 50 Hz input supply. The designed converter is capability to provide enhanced low input and output current ripple with low input total current harmonics (THD), robust regulation of DC-link voltage, desired power factor and less ripple output voltage. The outcomes of the EV charger are anticipated by the MATLAB/ SIMULINK results which verify theoretical analysis. The near UPF of the system is improved by the suggested charger's compliance with the IEC 61000-3-2 standard, which also increases system reliability and efficiency. Based on the results, the system appears to be a viable fast charging solution for EVs, as it reaches 97.8% efficiency with 0.9997 PF and 2.54% THD at the source.