Distributed state-of-charge secure balance control for battery energy storage systems under probabilistic input time-delays

This paper investigates the distributed state-of-charge (SOC) security balancing control problem of battery energy storage systems (BESSs) in DC microgrids subjected to probabilistic input time-delay. Since the signals between the controller and the BESS unit are mainly transmitted through the wireless network, and the transmission distance is relatively long, the input time-delay is a major factor affecting the SOC balancing control. Therefore, a Bernoulli distribution random variable with known probability is introduced to characterize the phenomenon of the probabilistic input time-delay, and an improved distributed equalization strategy is proposed to achieve the SOC equalization control under probabilistic input time-delay. With the help of the Lyapunov stability theory, sufficient conditions for the consensus error system to realize the SOC equalization of the BESSs under certain constraints are established. Finally, a series of numerical simulation experiments verify the effectiveness of the equalization scheme. © 2024 South China University of Technology. All rights reserved.