Optimal modeling and analysis of microgrid lithium iron phosphate battery energy storage system under different power supply states

Lithium iron phosphate battery (LIPB) is the key equipment of battery energy storage system (BESS), which plays a major role in promoting the economic and stable operation of microgrid. Based on the advancement of LIPB technology, two power supply operation strategies for BESS are proposed. One is the normal power supply, and the other is emergency power supply. Under the two operation strategies, the multi-objective optimization model with economic benefits, environmental benefits and power supply stability as the objective function is established for the first time, and the Newton Weighted Sum Frisch method (NWSFA) solution model is adopted. In the operation process, rain flow counting method is used for service life research of BESS, which improves the accuracy of energy storage annual cost calculation. A park in northern China is taken as a case study to demonstrate the application of this model. The simulation results show that the annual economic operating cost of BESS decreases by 19.12%, the energy supply reliability increases by 0.15%, and the optimal power price adjustment ratio of the system is 15%.