Transient Analysis in Dynamic Reconfigurable Battery System

With the fast-paced deployment of battery energy storage systems (BESSs), efficiency and safety issues of BESS, caused by the notorious “bucket effect”, have become prominent. Therefore, dynamic reconfigurable battery system (DRB) provides a promising approach to overcome the “bucket effect” by integrating batteries with power electronics switches in a systematic fashion and dynamically changing battery cell topology based on battery status. However, since the battery energy flow is digitized within milliseconds, there is no theoretical study of the transient behavior of DRB. In this paper, we will fill this gap by establishing a hybrid system model with considerations of the dynamic behaviors of battery cell and power electronics switch, and then to study the transient response of the hybrid system at different working frequencies under constant discharging current profile. Both analytical study and simulation analysis are carried out, which providing design insights for such hybrid system design.