Design of Photovoltaic System using Battery Energy Storage System along with Grid as Uninterruptable Supply System

Abstract

There is a need of alternative energy sources to meet the present day demands due to the depletion of fossil fuel resources. The alternative source used is solar energy, which is a clean inexhaustible and environment friendly potential resource. There are periodic variations in the output of standalone solar photovoltaic system or wind energy system so they cannot provide continuous supply of energy. Thus there are variations in the output of solar PV. Therefore to meet the load demands grid- interactive Photovoltaic using battery energy storage systems are now being implemented. This paper presents practical implementation of Photovoltaic (PV) system using battery and grid, the grid is used as uninterruptable power supply to load. The objective of the system is to balance the power flow from utility and PV to battery and from PV, battery to load. Such that PV is utilized effectively and continuous power is given to load. The PV and battery comes in role for various cases depending on the load. This objective can be achieved by appropriate programming in microcontroller 16F877A. This system is consists of solar panel, Lead acid battery, buck converter ,voltage divider, current sensor and PIC microcontroller 16F877A as control unit.