Power management of a grid connected PV/battery

Abstract

This paper presents the modelling and analysis of a grid connected photovoltaic and battery hybrid system to achieve the desired power sharing amongst the PV array, battery and grid for constant load supply with full utilization of photovoltaic generation and maintaining a constant DC link voltage. This hybrid system mainly consists of a PV array coupled through a unidirectional boost converter to a DC link. This DC link is further connected to the AC grid through an inverter and a coupling transformer. A storage device in the form of battery is connected to the DC link through a bidirectional converter for charging and discharging. The composite system is available for safe operation in on-grid as well as off-grid mode satisfying voltage and power balance constraints. Four different modes of operation have been demonstrated to verify and validate the desired power management amongst the various sources. MATLAB/SIMULINK software is used for simulating the composite model.