Dynamic distribution method of current load for distributed energy storage system in DC microgrid

被引：0

作者：

Mi Y. ^{[1
]}

Cai H. ^{[1
]}

Yuan M. ^{[2
]}

Chen X. ^{[1
]}

Fu Y. ^{[1
]}

Wang C. ^{[3
]}

机构：

[1] College of Electric Power Engineering, Shanghai University of Electric Power, Shanghai

[2] School of Mechatronic Engineering and Automation, Shanghai University, Shanghai

[3] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 10期

基金：

中国国家自然科学基金;

关键词：

DC microgrid; Distributed energy storage system; Droop control; Small-signal stability analysis; State-of-charge; Virtual impedance;

D O I：

10.16081/j.epae.201909007

中图分类号：

学科分类号：

摘要：

A hierarchical control strategy of distributed energy storage system is proposed for the independent DC microgrid, which considers the mismatched line impedance and energy storage capacity. The vir-tual impedance is adjusted dynamically by the load balance control to eliminate the influence of mismatched line impedance on the current load distribution accuracy. Then, through the SOC(State-Of-Charge) balance control, the current load is adjusted dynamically according to the capacity and SOC of each energy storage unit, so that the SOC error decreases by e-exponential curve, and finally the SOC balance of energy storage unit in the charging and discharging process is realized. The proposed method is solved by the dynamic consistency algorithm to realize information sharing among distributed energy storage units, which improves the reliability and flexibility of the system. The influence of key parameters on the system stability is discussed through small-signal stability analysis. Three kinds of experimental schemes are designed based on RTDS and experimental results verify that the proposed method can reasonably allocate current load according to energy storage capacity and improve the scalability and versatility of the system. © 2019, Electric Power Automation Equipment Press. All right reserved.

引用

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页码：17 / 23

页数：6

共 14 条

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