Bidirectional Isolated Electric Vehicle Charger Utilizing Three-Phase Matrix Converter

This research details the planning and construction of a three-phase bidirectional EV charger using a matrix converter and a single-stage AC-DC architecture with isolation of high-frequency transformers. The primary winding of the transformer receives highfrequency, single-phase AC after the matrix converter changes the grid’s AC supply line frequency. In order to convert high-frequency AC to DC and permit bidirectional power flow, the secondary of the transformer makes use of a pulse-width modulated rectifier. From a three-phase power source, a high-frequency single-phase AC waveform can be generated using a bipolar space vector modulation approach. This design allows for minimum harmonic distortion in the grid current and unity power factor operation during charging and discharging. A 72 V battery with a 50 Ah capacity and a switching frequency of 10 kHz can be used in the proposed system, which operates on a three-phase grid voltage of $415 \mathrm{~V}, 50 \mathrm{~Hz}$. In both the grid-to-vehicle (G 2 V) and vehicle-to-grid (V 2 G) modes, the grid-side total harmonic distortion is maintained below $4 \%$. The system can handle dynamic current reference with fluctuations between 30 A and 50 A. In addition to allowing for efficient bidirectional power transfer, these features can improve the charger’s power density, reliability, and safety.