Synchronization Control Based on Variable Fractional Delay Filter for Solar-PV-Battery System

For solar-photovoltaic (PV)-battery system, a synchronization control based on variable fractional delay filter is analysed here along-with the presence of a battery for ensuring reliable power to critical loads. In compliance with the IEEE-519 standard, the grid currents are obtained without harmonics thereby guaranteeing satisfactory performance along-with reduction in losses of the distribution network. Moreover, during the grid outage or islanded mode of operation, a voltage controller is utilized for power transfer between the PV array, battery and loads. The performance is validated though the simulation results and the system behaviour is observed for weak grid conditions along with grid outage conditions.