Privacy-Preserving Distributed Control for a Networked Battery Energy Storage System

TL;DR

This paper introduces a privacy-preserving distributed control algorithm for networked battery energy storage systems, ensuring state-of-charge balancing and power delivery without compromising agent privacy.

Contribution

It proposes a novel control framework using privacy-preserving estimators for distributed SoC balancing in BESS networks, enhancing privacy and coordination.

Findings

Achieves asymptotic SoC balancing and power delivery.

Ensures privacy against external eavesdroppers.

Validated through simulation results.

Abstract

The increasing deployment of distributed Battery Energy Storage Systems (BESSs) in modern power grids necessitates effective coordination strategies to ensure state-of-charge (SoC) balancing and accurate power delivery. While distributed control frameworks offer scalability and resilience, they also raise significant privacy concerns due to the need for inter-agent information exchange. This paper presents a novel privacy-preserving distributed control algorithm for SoC balancing in a networked BESS. The proposed framework includes distributed power allocation law that is designed based on two privacy-preserving distributed estimators, one for the average unit state and the other for the average desired power. The average unit state estimator is designed via the state decomposition method without disclosing sensitive internal states. The proposed power allocation law based on these estimators ensures asymptotic SoC balancing and global power delivery while safeguarding agent privacy from external eavesdroppers. The effectiveness and privacy-preserving properties of the proposed control strategy are demonstrated through simulation results.