分布式电池储能系统在概率输入延时下的荷电状态安全均衡控制

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

中文关键词  电池储能系统  荷电状态均衡  直流微电网  概率输入延时

英文关键词  battery energy storage systems  state-of-charge balance  DC microgrids  probabilistic input time-delays

中文摘要

      本文研究了直流微电网中电池储能系统(BESSs)在概率输入延时下的分布式荷电状态(SOC)安全均衡控制问题. 由于控制器与BESS单体系统之间的信号主要通过无线网络传输, 且传输距离较远, 输入时间延时是影响SOC均衡控制的一大因素. 为此, 论文通过引入一个概率已知的服从伯努利分布的随机变量来表征概率输入时滞现象, 提出了一种改进的分布式均衡策略来实现概率输入延时下的SOC均衡控制. 借助李雅普诺夫稳定性理论, 建立了均衡误差系统在一定约束条件下实现BESSs的SOC均衡的充分条件. 最后, 通过一系列的数值仿真实验验证了该均衡方案的有效性.

英文摘要

      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.