Comprehensive electro‐thermal battery‐model for Li‐ion batteries in microgrid applications

Abstract

AbstractBattery energy storage systems (BESSs) are frequently used to buffer the difference between intermittent renewable generations and energy demand in microgrids. The operation of BESS is affected by dynamics of charging/discharging current, internal temperature build up, extreme reaches of state of charge level, and so forth. This article presents a comprehensive electro‐thermal model for Li‐ion batteries that can be used to investigate dynamic and static performances of a microgrid under real time operating conditions. The battery‐model has the ability to self‐update its parameters with the variation of core‐temperature, and also to accommodate inherent hysteresis present on parameters between charging and discharging events. The developed model is presented as a block in MATLAB/Simulink for easier use by others. In parallel with that, the details of the development of a complete simulation platform of a microgrid is also described, which includes battery charging and discharging converter systems, bidirectional grid‐end AC/DC converter system, wind energy input, solar PV energy input, load and closed loop control associated with converter systems. The battery model is simulated within the microgrid platform with a chosen energy management criteria. The results of the simulation are also presented and discussed.