Distributed Secondary Control for Microgrids with Heterogeneous Battery Energy Storage Systems Under Switching Communication Topology

This paper is concerned with the distributed secondary control problem of multiple battery energy storage systems (BESSs) in an islanded microgrid, where the dynamics of each battery is heterogeneous. It is assumed that each battery can communicate with its neighbors via communication networks whose communication topologies are switching over time. A distributed finite-time secondary control scheme is proposed to ensure frequency regulation, active power sharing and energy level balancing of BESSs in a finite time, while operational constraints can be satisfied at any control transient time. Finally, validity and effectiveness of the proposed control scheme are demonstrated by case studies on a modified IEEE 57-bus testing system.