Grid Interface Solar Energy Powered Fast Charging Station with Seamless Power Transfer Scheme

This paper presents renewable energy source (RES) based microgrid with battery energy storage (BES) for fast DC electric vehicle charging station and local AC loads. This microgrid functions both with and without the utility grid while feeding uninterrupted power to loads. The main aim of this work is to present robust control strategies for voltage source inverter (VSI) to operate in dual mode. Due to RES penetration and presence of nonlinear loads at the point of interconnection (POI), there are always power quality concerns, inappropriate voltage control, and improper power flow problems. In grid-interface mode (GIM), the adaptable enhanced second order generalized integrator based frequency locked loop (E-SOGI-FLL) control method is employed to address the aforementioned issues with an adjustable approach for enhancing the performance of the system. Moreover, in the case of islanded mode (IM), converter control is carried out utilizing artificial neural network (ANN) based control to generate precise reference currents under dynamics. The proper application of BES for utilizing power management strategy is also demonstrated under source and load perturbations. The presented topology is simulated in MATLAB Simulink platform under various perturbations to obtain the effective response of the system in both GIM and IM modes of operation.