Prespecified-Time Observer-Based Distributed Control of Battery Energy Storage Systems

Abstract

The distributed control of battery energy storage systems (BESSs) plays an important role in the practical operation of microgrid. This brief studies the state-of-charge (SoC) balancing and the total charging/discharging power tracking issues for BESSs with multiple distributed heterogeneous battery units under the premise that only partial battery units can access the desired power. First, two distributed prespecified-time observers are proposed to estimate average battery units state and average desired power respectively. Second, a novel distributed BESSs control strategy based on prespecified-time observers is proposed, which realizes SoC balancing and power tracking of BESSs assuming only partial battery units can access the desired power. Two distinctive advantages of this brief are (i) both the average desired power and the average battery state can be accurately estimated within the prespecified time, which can be determined in advance and independent of initial states or control parameters, and (ii) the communication costs are reduced effectively and single-point failures can be avoided. Finally, two simulation examples are given to verify the effectiveness and superiority of the proposed control strategy.