This paper proposes an adaptive virtual power rating method for state of charge (SoC) balancing among distributed battery units (BUs) in a DC microgrid. The virtual power rating is flexibly determined according to the SoC to obtain the droop gain of BU, and the balanced SoC is achieved by means of the modified droop controller. Because an accurate power sharing among BUs is satisfied by using only virtual power rating, SoC balancing performance is consistently ensured regardless of the line resistance difference. Moreover, the voltage restoration to keep the grid voltage at a desired value is easily realized without PI controller, and the proposed control strategy is implemented based on the distributed control method with simple low-bandwidth communication. The system stability is investigated, and the performance of the control method is demonstrated through both simulations and experiments.

中文翻译：

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直流微电网中基于自适应虚拟额定功率的分布式电池组电荷平衡状态

本文提出了一种自适应虚拟额定功率方法，用于直流微电网中分布式电池单元 (BU) 之间的荷电状态 (SoC) 平衡。根据SoC灵活确定虚拟额定功率以获得BU的下垂增益，通过改进的下垂控制器实现SoC的平衡。由于仅使用虚拟额定功率即可满足 BU 之间的准确功率分配，因此无论线路电阻差异如何，都能始终确保 SoC 平衡性能。此外，无需PI控制器即可轻松实现电压恢复以将电网电压保持在所需值，并且所提出的控制策略基于具有简单低带宽通信的分布式控制方法来实现。系统稳定性考察，