Performance analysis of LiFePO4 battery energy storage for utility-scale PV system

To help integrate the utility-scale PV system into the power grid, the battery energy storage has been introduced as one promising scheme. With the rapid development of battery technology, the lithium iron phosphate (LiFePO₄) battery has attracted attention in the renewable integration applications due to its high power and energy density. The main objective of this work is to analyze the performance of LiFePO₄ battery when it is applied to help the integration of utility-scale PV plant system. Three factors are considered as the performance criteria of the battery, including LiFePO₄ battery lifetime with cost, the dispatchable-generation duration in one year, and the annual generation of the PV and battery system. Specifically, a developed LiFePO₄ physical battery model is incorporated into a utility network model with PV plant systems. The analysis results can improve the understanding of the LiFePO₄ battery performance in the application with utility-scale PV systems and provide a design reference for PV plant owners and battery manufacturers.