Abstract
An electric vehicle (EV) charging station (CS) powered by solar energy and supported with a battery energy storage (BES) and three-phase building supply is presented in this work for residential and commercial building applications. Considering different classes of EVs parked in residential or commercial buildings, presented charger facilitates AC-charging (single/three-phase) functionality for onboard EV charger and incorporates a DC charging feature to enable fast charging of EVs. In the given configuration, the solar photovoltaic (PV) array, BES, and grid combinedly realize a more reliable building supply for the EVs and critical building loads, which not only reduces the burden on the grid but also has the capability to fulfill the active/reactive power demand of grid operators. Further, the impact of nonlinear characteristics of building loads and AC chargers on the three-phase supply is excellently eliminated by a generalized integrator based control approach with improved DC-offset elimination capability. It is noteworthy that presented CS realizes a balanced and undistorted three-phase supply currents under both normal and abnormal conditions such as supply voltage sag/swell/ distortions and unbalanced conditions. During polluted/abnormal grid conditions, the second-order sequence filter-based frequency locked loop (SOSF-FLL) generates sinusoidal templates of supply voltage by extracting its positive sequence component. Finally, the design, operation, and control of the CS are verified through software simulation in the MATLAB/Simulink, and corresponding results are discussed for the performance justification.
Published Version
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