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State of charge balancing for distributed batteries in DC microgrids without communication networks
Journal of Power Electronics ( IF 1.4 ) Pub Date : 2020-12-07 , DOI: 10.1007/s43236-020-00188-3
Khanh Duc Hoang , Hong-Hee Lee

State of charge (SoC) balancing and accurate power sharing have been achieved among distributed batteries in a DC microgrid without a communication network by injecting an AC signal. The frequency of the generated signal is proportional to the SoC of a predefined master battery and it is used for the other batteries as a common variable to estimate the SoC and output power of the master battery. Based on modified droop control, the distributed batteries realize a balanced SoC and accurate power sharing regardless of the differences in the line resistance. A communication system is not required. Thus, the system cost is notably reduced. Moreover, to guarantee system reliability, a new master battery selection method is provided to replace the master battery under fault conditions. The effectiveness of the proposed strategy was verified by simulations and experimental results.

中文翻译:

无通信网络直流微电网中分布式电池的电荷平衡状态

通过注入交流信号,在没有通信网络的直流微电网中的分布式电池之间实现了荷电状态 (SoC) 平衡和准确的功率共享。所产生信号的频率与预定义的主电池的SoC成正比,并用于其他电池作为共同变量来估计主电池的SoC和输出功率。基于改进的下垂控制,分布式电池实现了平衡的 SoC 和准确的功率分配,而不管线路电阻的差异。不需要通信系统。因此,系统成本显着降低。此外,为了保证系统的可靠性,提供了一种新的主​​电池选择方法,用于在故障情况下更换主电池。
更新日期:2020-12-07
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