Abstract:

This study examines the implementation of an external battery charger for the electrical vehicle that is connected to the grid and can also serve as a power generator (vehicle-to-grid) and a battery charger (grid-to-vehicle). The charger's topology includes a bidirectional converter composed of a grid-facing AC-DC cascaded H-bridge present on the front end and a DC-DC converter on the back end that controls power flowing between the battery of the vehicle and the power system. For safety measures, galvanic isolation is implemented on the user’s side. The designed control algorithm regulates EV and battery currents using an active power instruction for grid-to-vehicle and vehicle-to-grid operation, in combination with reactive power instructions from the power system as necessary. The article offers an adaptive notch filter-based (ANF) control to calculate the system phase and sync the produced reference current, bypassing the requirement for a phase-locked loop (PLL) and by doing so minimizing controller design complexity while boosting steady-state and transient efficacy. The Simulink model of an external battery charger for the electric vehicle of 12.6 kVA was created in MATLAB software and the quality of the control algorithm is assessed during the operations of electric vehicle charger, such as vehicle-to-grid, grid-to-vehicle, and reactive power compensation mode.

Description:

G2V, V2G, ANF, reactive power, Bi-directional electrical vehicle charger