Energy control strategy of distributed energy storage system considering different capacities in isolated DC microgrid

被引：0
|
作者：
Lin J. [1 ,2 ]
Wang Z. [1 ,2 ]
Zhang Y. [3 ]
机构：
[1] Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai
[2] Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai
[3] Fonrich(Shanghai) New Energy Technology Co., Ltd., Shanghai
来源：
Wang, Zhixin (wangzxin@sjtu.edu.cn) | 1600年 / Electric Power Automation Equipment Press卷 / 40期
基金：
国家重点研发计划;
关键词：
Accurate current distribution; Distributed energy storage system; Dynamic consensus algorithm; Energy control; Hierarchical control; Isolated DC microgrid; State of charge equalization;
D O I：
10.16081/j.epae.202009025
中图分类号：
学科分类号：
摘要：
In order to simultaneously meet the requirements of accurate current distribution and SOC(State Of Charge) equalization of DESS(Distributed Energy Storage System) with different capacity energy storage units in isolated DC microgrid,prevent DESS from over-discharging or over-charging,and improve system's operation security and stability,an energy control strategy of DESS considering different capacities is proposed. The control strategy adopts a hierarchical structure. In the communication layer,the adjacent nodes communicate through low bandwidth communication lines and dynamic consistency algorithm is adopted to obtain the average information. In the droop control layer,a virtual voltage drop equalizer is used to add current distribution accuracy compensation to dynamically eliminate the influence of line impedance on current distribution accuracy,and a SOC equalizer is used to adjust the droop coefficient to improve the SOC equalization accuracy. In the direct control layer,the bidirectional DC/DC converters in DESS are directly controlled according to the given values from upper layer. The stability of the control strategy is verified by frequency domain analysis. The simulation model of DESS is built in MATLAB/Simulink and its opera-tion processes under different working conditions are analyzed. Simulative results show that,compared with the existing methods,the proposed control strategy can realize accurate current distribution and SOC equa-lization of DESS with different capacities,can adapt to the change of line impedance,and has plug-and-play performance. © 2020, Electric Power Automation Equipment Press. All right reserved.
引用
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页码：139 / 146
页数：7
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