This paper presents an accurate power sharing method to balance the state of charge (SoC) among the distributed battery energy units (BEUs) in a dc microgrid. The virtual power rating concept of the proposed control method is introduced, and accurate power sharing is achieved according to the SoC levels and the virtual power ratings, regardless of the line resistance difference. With the accurate power sharing based on SoC, BEUs with higher SoC accurately supply more power to the system than the lower SoC BEUs during the discharging period, and BEUs with lower SoC accurately supply less power to the system than the higher SoC BEUs during the charging period. Moreover, with the voltage restoring method, the dc grid voltage is maintained within the desired voltage level, and with the proposed control method, the system stability is verified. The proposed control scheme is implemented in a distributed manner that relies on low bandwidth communication. The effectiveness of the proposed control method is proved by simulation and experiments.

中文翻译：

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分布式直流微电网中平衡电池充电状态的精确功率共享


本文提出了一种精确的功率共享方法来平衡直流微电网中分布式电池能量单元（BEU）之间的充电状态（SoC）。该控制方法引入了虚拟额定功率概念，并且根据SoC级别和虚拟额定功率实现了精确的功率共享，而不管线路电阻差异如何。通过基于 SoC 的精确功率共享，在放电期间，具有较高 SoC 的 BEU 可以准确地为系统提供比较低 SoC BEU 更多的功率，而具有较低 SoC 的 BEU 在充电期间可以准确地为系统提供比较高 SoC BEU 更少的功率时期。此外，通过电压恢复方法，直流电网电压保持在期望的电压水平内，并且通过所提出的控制方法，验证了系统的稳定性。所提出的控制方案以依赖于低带宽通信的分布式方式实现。通过仿真和实验证明了所提出控制方法的有效性。