Optimization of energy storage based on floating charge lithium iron phosphate battery

Abstract

Lithium iron phosphate batteries are often used as power supplies, power batteries and energy storage batteries for electronic equipment, and their charge and discharge cycle characteristics have been studied extensively. However, when it is used as a new battery power source in a substation, the battery pack must be hung on the charger in a fully charged state for a long time and run for float charging. In this operating mode, the choice of the float billing voltage of the lithium iron phosphate battery, the size of the float charging existing, and features of unexpected discharge and battery life under lasting float charging still need to be studied. For that reason, a simulation model of the lithium battery power storage space system was developed, and the control criteria were adapted to make the particular curve constant with the examination information. Based on the real control logic of the energy storage inverter, a simulation model of the power storage inverter is built. With simulation screening and comparison with the actual outside characteristics of the inverter, the control parameters of the simulation model are continuously optimized to make them regular with the outside attributes of the actual inverter. The actual battery access point substation operating mode data is collected and sorted out, an appropriate equivalence on the battery system is performed, and an equivalence model in MATLAB/SIMULINK and PSCAD/EMTDC is built, which forms a complete simulation model together with the battery system model[1].