State-of-charge Balancing Research of Distributed Energy Storage Units With Unmatched Line Impedance

被引：0
|
作者：
Mi Y. [1 ]
Cai H. [1 ]
Song G. [1 ]
Yu S. [1 ]
Li Z. [1 ]
Fu Y. [1 ]
机构：
[1] College of Power Engineering, Shanghai University of Electric Power, Yangpu District, Shanghai
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 15期
基金：
中国国家自然科学基金;
关键词：
Current load sharing; DC microgrid; Distributed energy storage unit; Droop control; State of charge;
D O I：
10.13334/j.0258-8013.pcsee.180733
中图分类号：
学科分类号：
摘要：
In order to guarantee the voltage stability and power balance in the island DC microgrid, which is caused by the distributed energy output power or load fluctuation, it is necessary to take advantage of charge and discharge for distributed energy storage units (DESUs). Due to the difference of line impedance among DESUs, the state-of-charge of the DESUs may be unbalanced under the conventional droop control, which may lead to overcharging or over-discharging of DESUs and even shorten service life of battery. Therefore, an improved droop control strategy with unmatched line resistance was proposed. By introducing the information of current and state-of-charge to the conventional droop control, the synchronization signal was sent to trigger the sampling holder by the central controller, and automatically adjust the reference voltage of droop characteristic curve according to the sampling period. Therefore, the influence of line impedance on current load distribution can be removed, and the current can be reasonably distributed among DESUs to avoid overcharge and overdischarge. Finally, the effectiveness and correctness of the proposed control strategy is verified through the RTDS experiment. © 2019 Chin. Soc. for Elec. Eng.
引用
收藏
页码：4441 / 4450
页数：9
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