Project title:Power Quality Improvement in a PV Based EV Charging Station Interfaced with Three Phase Grid.

Electrical engineering

This paper addresses enhancing power quality in a solar photovoltaic (PV) array-driven Electric Vehicle (EV) charging station. This station can function independently, utilizing PV array-generated power to charge EV batteries, while also interfacing with the utility grid to supply excess power. Additionally, it offers reactive power compensation to enhance grid power quality. The charging station serves several purposes: (i) compensating harmonic currents, (ii) controlling EV battery charging/discharging, (iii) simultaneous EV battery charging and harmonic current compensation, and (iv) simultaneous discharging and harmonic current compensation. The control system ensures the charging station operates effectively even under unbalanced grid voltages, reducing total harmonic distortion in grid currents to below 5% as per IEEE-519 standards. It is designed to primarily function in grid-connected mode. However, if synchronism with the grid is lost, it seamlessly transitions to standalone mode, with the PV array charging the EV battery. Additionally, a synchronization control mechanism is developed to reconnect the system to the grid when it becomes available.

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