Power Management Control Strategy for PV-Battery Standalone System

For a standalone PV system, there is a requirement of a battery energy storage system(BESS). This paper represents an efficient power management strategy for fulfilling the load power requirements at all times. A boost converter (boostmppt) is used to derive maximum power from the PV panel along with a buck converter(buckcharging) connected in parallel for battery charging. The discharge operation of the battery is controlled by another boost converter(boostdischarging). Depending on the load power requirement and the PV power generated, the discharge/charge of the battery occurs. The control scheme used in this paper enables cross-coupling of boostmppt and buckcharging for the regulation of output voltage by controlling the buckcharging. A complete control over the charging and discharging current is ensured by the double loop control scheme used. This paper represents a simpler approach to make the standalone system more reliable and efficient. The proposed strategy and control scheme operation has been verified by MATLAB® simulations.