Smart Battery Management System for Integrated PV, Microinverter and Energy Storage

This paper presents a Smart Battery Management System (SBMS) for integrated PV, Microinverter with Lithiumion battery pack. The battery in the integrated module is mainly dedicated to store the excess power generated from the PV panel. The battery also operates as a backup power source to compensate for the power mismatch between the source and the load. Therefore, the incorporated management system in the integrated module is necessary for balancing, protecting, and optimizing the lifetime of the battery. The proposed SBMS aims to optimize the battery capacity of each PV panel, provides thermal management strategy, and Master Controller Unit (MCU). MCU is the main controller which includes control algorithm for the 3-port microinverter and estimates the state-of-functions such as state-of-charge (SOC) and state-of-health (SOH) to make the integrated system more secure, reliable, and cost effective. In the paper, the optimum battery size has been simulated, the algorithm for MCU is described with battery model, and the battery modelling and state-of-functions have been theoretically and experimentally verified.