Optimization Techniques for DC Bus Voltage Balancing in a PV Grid System Based EVs Charging Station

Abstract

This work presents a smart algorithm to optimize energy in electric vehicles charging station while treating various constraints, i.e., the instability of renewable energy sources and the potential limited power provided by the grid. The PV array is recognized as one of the efficient energy sources to feed the charging station system; it is directly tied into a voltage DC bus, and thus the lithium–ion battery is implemented in this platform to complete the power flow of each potential charging scenario. In this research, a management algorithm is set to take into account the fluctuant power state of both, the DC and the AC bus. Besides, the algorithm handles also the state of charge of the storage battery of the charging station via two kinds of control, i.e., MPPT algorithm and PI control.