Tripti Kunj, Anand Mohan, and Kirti Pal
Electric vehicle charging station, diesel generator, solar PV array, controller, energy management
This article presents a system comprising a solar photovoltaic (PV) array, a battery energy storage (BES), a diesel generator (DG) set, and a grid-based electric vehicle (EV) charging station (CS) for continuous charging in islanded, grid-connected, and DG set connected modes. The CS is primarily designed to utilise the solar PV array and BES for charging the EV battery. However, if the storage battery is depleted or the solar PV array generation is unavailable, the CS intelligently switches to drawing power from either the grid or the DG set. Notably, the power from the DG set is carefully managed to maintain an operating level of 80%–85% loading, ensuring maximum fuel efficiency across all loading conditions. Additionally, in collaboration with the storage battery, the CS regulates the generator voltage and frequency without the need for a mechanical speed governor. It also ensures that power drawn from the grid or DG set maintains a unity power factor even under nonlinear loading conditions. Moreover, the point of common coupling voltage is synchronised with the grid/generator voltage to enable uninterrupted charging.
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