| 引用本文: | 林嘉伟,王志新,张永.独立直流微电网中考虑不同容量的分布式储能系统能量控制策略[J].电力自动化设备,2020,40(10): |
| LIN Jiawei,WANG Zhixin,ZHANG Yong.Energy control strategy of distributed energy storage system considering different capacities in isolated DC microgrid[J].Electric Power Automation Equipment,2020,40(10): |
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| 摘要: |
| 为了同时满足独立直流微电网中含有不同容量储能单元的分布式储能系统(DESS)的电流精确分配及荷电状态(SOC)均衡的要求，防止DESS过放或过充，提高系统运行安全性与稳定性，提出了一种考虑不同容量的DESS能量控制策略。控制策略采用分层结构：在通信层中，相邻节点通过低带宽通信线进行通信，采用动态一致性算法获得平均值信息；在下垂控制层中，采用虚拟压降均衡器添加电流分配精度补偿量，动态消除线路阻抗对电流分配精度的影响，通过SOC均衡器调整下垂系数，提高SOC均衡精度；在直接控制层中，根据上层给定值直接控制DESS中的双向DC/DC变换器。通过频域分析验证了所提控制策略的稳定性。在MATLAB/Simulink中搭建DESS仿真模型，分析在不同工况下的运行过程。仿真结果表明，与现有方法相比，所提控制策略同时实现了不同容量DESS的电流精确分配及SOC均衡，能够适应线路阻抗变化的情况，且具备即插即用性能。 |
| 关键词: 独立直流微电网 分布式储能系统 能量控制 荷电状态均衡 电流精确分配 动态一致性算法 分层控制 |
| DOI：10.16081/j.epae.202009025 |
| 分类号:TM732 |
| 基金项目:国家重点研发计划资助项目(2018YFB1503000,2018YFB1503001)；上海市科委技术标准专项(18DZ2205700)；上海市闵行区重大产业技术攻关项目(2019MH-ZD26) |
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| Energy control strategy of distributed energy storage system considering different capacities in isolated DC microgrid |
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LIN Jiawei1,2, WANG Zhixin1,2, ZHANG Yong3
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1.Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;3.Fonrich(Shanghai) New Energy Technology Co.,Ltd.,Shanghai 201114, China
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| Abstract: |
| 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 operation 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 equalization of DESS with different capacities, can adapt to the change of line impedance, and has plug-and-play performance. |
| Key words: isolated DC microgrid distributed energy storage system energy control state of charge equalization accurate current distribution dynamic consensus algorithm hierarchical control |
