The lithium iron phosphate battery is a lithium ion battery using lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material.The rated voltage of the monomer is 3.2V, and the charge cut-off voltage is 3.6V~3.65V.1. Stabilize the power grid: Suppress the short-term impact of the microgrid, so that the microgrid can run stably in the grid-connected/isolated grid mode;Provide short-term stable power supply. 2. Support isolated grid operation: When the microgrid is turned into the isolated grid mode, the microgrid energy storage system can quickly switch to the voltage source working mode to provide the reference voltage for the microgrid bus.Lithium iron phosphate battery has a series of unique advantages such as high working voltage, high energy density, long cycle life, green environmental protection, etc., and supports stepless expansion, and can store large-scale electric energy after forming an energy storage system. The lithium iron phosphate battery energy storage system consists of a lithium iron phosphate battery pack, a battery management system (Battery Management System, BMS), a converter device (rectifier, inverter), a central monitoring system, a transformer, etc.