直流微电网分布式储能系统精确电流分配策略

doi:10.11930/j.issn.1004-9649.202201057

中国电力 ›› 2022, Vol. 55 ›› Issue (8): 96-103,112.DOI: 10.11930/j.issn.1004-9649.202201057

• 新型电力系统储能关键技术应用 • 上一篇下一篇

直流微电网分布式储能系统精确电流分配策略

王波¹, 张占营¹, 张霄¹, 席晟哲¹, 邓锦², 米阳²

1. 国网河南省电力公司安阳供电公司，河南安阳 455000;
2. 上海电力大学电气工程学院，上海 200090

收稿日期:2022-01-17 修回日期:2022-05-26 发布日期:2022-08-18
作者简介:王波（1968—），男，硕士，高级工程师，从事电网规划、管理工作，E-mail：603688006@qq.com;邓锦（1998—），男，通信作者，硕士研究生，从事微电网控制技术研究，E-mail：jindengee@163.com
基金资助:
国家自然科学基金资助项目（基于多储能调节的多源直流微电网鲁棒协调控制及稳定性研究，61873159）；上海市自然科学基金资助项目（22ZR1425500）。

Accurate Current Sharing Strategy for Distributed Energy Storage System in DC Microgrids

WANG Bo¹, ZHANG Zhanying¹, ZHANG Xiao¹, XI Shengzhe¹, DENG Jin², MI Yang²

1. Anyang Power Supply Company, State Grid Henan Electric Power Company, Anyang 455000, China;
2. College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China

Received:2022-01-17 Revised:2022-05-26 Published:2022-08-18
Supported by:
This work is supported by National Natural Science Foundation of China (Robust and Coordinated Control and Stability Study of Multi-source DC Microgrid Based on Multiple Energy Storage Regulation, No.61873159), Shanghai Municipal Natural Science Foundation (No.22ZR1425500).

摘要/Abstract

摘要： 在孤岛直流微电网中，需要采用储能系统（energy storage system，ESS）来维持发电和负载消耗之间的功率平衡。为了避免分布式储能单元（distributed energy storage units，DESU）的过度充放电，针对不同容量的分布式储能单元设计了基于自适应虚拟阻抗的荷电状态（state of charge, SOC）均衡策略。同时，提出了精确电流分配方法来消除不匹配线路电阻对SOC均衡的影响。通过所提方法，具有较高SOC的DESU在放电期间可向直流微电网提供更多的功率，反之亦然。此外，根据系统特征方程分析了所提方案的稳定性。最后，通过基于实时数字仿真系统（real time digital simulation，RTDS）的算例结果验证了所提控制策略的有效性。

关键词: 直流微电网, 储能系统, 荷电状态, 精确电流分配, 虚拟阻抗

Abstract: In islanded direct current (DC) microgrids, the power balance between power generation and load consumption must be maintained by the energy storage system (ESS). To avoid the over-charging or over-discharging of distributed energy storage units (DESUs), this study designs the state of charge (SOC) balancing strategy based on adaptive virtual resistance for DESUs with different capacities. Meanwhile, it proposes an accurate current sharing method to eliminate the impact of mismatched line resistance on SOC balancing. With the proposed strategy, the DESUs with high SOC can supply more power to DC microgrids than the DESUs with low SOC in the discharging period and vice versa. Additionally, the stability of the proposed scheme is analyzed according to the characteristic equation of the system. Finally, the results of calculation examples based on real-time digital simulation (RTDS) verify that the proposed control strategy is effective.

Key words: DC microgrid, energy storage system, state of charge, accurate current sharing, virtual resistance

王波, 张占营, 张霄, 席晟哲, 邓锦, 米阳. 直流微电网分布式储能系统精确电流分配策略[J]. 中国电力, 2022, 55(8): 96-103,112.

WANG Bo, ZHANG Zhanying, ZHANG Xiao, XI Shengzhe, DENG Jin, MI Yang. Accurate Current Sharing Strategy for Distributed Energy Storage System in DC Microgrids[J]. Electric Power, 2022, 55(8): 96-103,112.

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直流微电网分布式储能系统精确电流分配策略

Accurate Current Sharing Strategy for Distributed Energy Storage System in DC Microgrids

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直流微电网分布式储能系统精确电流分配策略

Accurate Current Sharing Strategy for Distributed Energy Storage System in DC Microgrids

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