A standalone solar photovoltaic power generation system with automated bidirectional battery charging discharging control

This paper suggests a design for a standalone photovoltaic (PV) system for house applications with a storage unit and an isolated full bridge bidirectional dc-dc converter scheme for controlled battery charging and discharging purpose. The maximum amount of power is extracted from the solar array in each and every step by controlling the duty ratio of the power MOSFET of the boost converter connected to it. In this paper, the pv panel, boost converter assembly, and a five level flying capacitor single phase inverter along with resistive load is interfaced to the battery bank by the proposed bidirectional converter scheme. Simulation results verify that the direction of power flow from the high voltage dc bus to the battery is regulated automatically depending upon the fluctuation of the high dc bus voltage from the desired value. The amount of total harmonic distortion in the inverter output and overall switching losses of the entire system is also calculated.