用于电力系统经济性分析的锂离子电池精确建模

This paper presents a realistic yet linear model of battery energy storage to be used for various power system studies. The presented methodology for determining model parameters is based on experimental data obtained on lithium-ion cells of four different technologies. The model itself takes into account two important, but often neglected battery characteristics: (i) variable energy charging/discharging efficiency, and (ii) nonlinear energy charging curve. The proposed model is compared with three simplified models, taking into account only one or zero of the above two mentioned battery characteristics. To prove the applicability and advantages in practice, all four models are used to obtain the optimal day-ahead market schedules of a battery storage and the feasibility of the obtained schedules is experimentally validated using a dedicated testbed. On top of the proposed model, this paper contributes to the community by providing battery parameters for the four most common lithium-ion technologies: LCO, LFP, LTO and NMC.