Abstract:
This article presents a solar photovoltaic (PV) array-powered grid-connected domestic electric vehicle (EV) charger that serves EVs, household loads, and the grid. The charger uses a PV array to charge and power household loads autonomously.
The grid-connected mode is used when the PV array is absent or insufficient. The charger’s synchronization and seamless mode switching control allow it to instantly connect/disconnect from the grid without disrupting EV charging or residential supply. The charger also supports vehicle-to-grid active/reactive power and vehicle-to-home power transfer for islanded loads.
The charger is additionally managed as an active power filter to achieve unity power factor and 5% grid current total harmonic distortion. Additionally, a sliding mode control is used to regulate the dc-link voltage for energy management.
A second-order generalized integrator frequency-locked loop with dc offset rejection generates the sinusoidal reference grid current for successful operation under distorted voltage. Laboratory testing validates the charger for a single-phase 230-V, 50-Hz grid.
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