SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences
In an islanded DC microgrid, there is a problem of slow state of charge (SOC) equalization between distributed energy storage units (DESUs) with different capacities. To address this issue, a fast SOC equalization strategy for DESUs, which accounts for capacity differences, is proposed. First, the S...
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Editorial Office of Journal of Shanghai Jiao Tong University
2025-03-01
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| Series: | Shanghai Jiaotong Daxue xuebao |
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| Online Access: | https://xuebao.sjtu.edu.cn/article/2025/1006-2467/1006-2467-59-3-376.shtml |
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| author | WEI Maohua, YANG Ling, WENG Liangtao, YANG Jipei, CHEN Yongqiao |
| author_facet | WEI Maohua, YANG Ling, WENG Liangtao, YANG Jipei, CHEN Yongqiao |
| author_sort | WEI Maohua, YANG Ling, WENG Liangtao, YANG Jipei, CHEN Yongqiao |
| collection | DOAJ |
| description | In an islanded DC microgrid, there is a problem of slow state of charge (SOC) equalization between distributed energy storage units (DESUs) with different capacities. To address this issue, a fast SOC equalization strategy for DESUs, which accounts for capacity differences, is proposed. First, the SOC equalizer constructs a relationship between the droop coefficient and SOC using a power function. By selecting appropriate equalization adjustment coefficients, the droop coefficient can be adaptively controlled, thereby accelerating SOC equalization. Then, the virtual droop equalizer is introduced to mitigate the impact of line impedance on current distribution accuracy by simply adjusting the PI controller, which improves the precision of current distribution. Additionly, the selection range of control parameters for this strategy is determined by using a system stability analysis. Finally, a DC microgrid hardware-in-the-loop experimental platform is developed. The experimental results, compared with those from existing literature under various operating conditions, demonstrate that the proposed control strategy improves the speed of SOC equalization and realizes the rapid recovery of bus voltage. |
| format | Article |
| id | doaj-art-e0cb08f7efe34a07a8ef6f436d8891be |
| institution | DOAJ |
| issn | 1006-2467 |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Editorial Office of Journal of Shanghai Jiao Tong University |
| record_format | Article |
| series | Shanghai Jiaotong Daxue xuebao |
| spelling | doaj-art-e0cb08f7efe34a07a8ef6f436d8891be2025-08-20T03:03:46ZzhoEditorial Office of Journal of Shanghai Jiao Tong UniversityShanghai Jiaotong Daxue xuebao1006-24672025-03-0159337638710.16183/j.cnki.jsjtu.2023.271SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity DifferencesWEI Maohua, YANG Ling, WENG Liangtao, YANG Jipei, CHEN Yongqiao0School of Automation, Guangdong University of Technology, Guangzhou 510006, ChinaIn an islanded DC microgrid, there is a problem of slow state of charge (SOC) equalization between distributed energy storage units (DESUs) with different capacities. To address this issue, a fast SOC equalization strategy for DESUs, which accounts for capacity differences, is proposed. First, the SOC equalizer constructs a relationship between the droop coefficient and SOC using a power function. By selecting appropriate equalization adjustment coefficients, the droop coefficient can be adaptively controlled, thereby accelerating SOC equalization. Then, the virtual droop equalizer is introduced to mitigate the impact of line impedance on current distribution accuracy by simply adjusting the PI controller, which improves the precision of current distribution. Additionly, the selection range of control parameters for this strategy is determined by using a system stability analysis. Finally, a DC microgrid hardware-in-the-loop experimental platform is developed. The experimental results, compared with those from existing literature under various operating conditions, demonstrate that the proposed control strategy improves the speed of SOC equalization and realizes the rapid recovery of bus voltage.https://xuebao.sjtu.edu.cn/article/2025/1006-2467/1006-2467-59-3-376.shtmldirect current (dc) microgriddistributed energy storage systemstate of charge (soc)voltage equalizationvoltage compensation |
| spellingShingle | WEI Maohua, YANG Ling, WENG Liangtao, YANG Jipei, CHEN Yongqiao SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences Shanghai Jiaotong Daxue xuebao direct current (dc) microgrid distributed energy storage system state of charge (soc) voltage equalization voltage compensation |
| title | SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences |
| title_full | SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences |
| title_fullStr | SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences |
| title_full_unstemmed | SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences |
| title_short | SOC Balancing Strategy for Distributed Energy Storage Units in Isolated DC Microgrids Considering Capacity Differences |
| title_sort | soc balancing strategy for distributed energy storage units in isolated dc microgrids considering capacity differences |
| topic | direct current (dc) microgrid distributed energy storage system state of charge (soc) voltage equalization voltage compensation |
| url | https://xuebao.sjtu.edu.cn/article/2025/1006-2467/1006-2467-59-3-376.shtml |
| work_keys_str_mv | AT weimaohuayanglingwengliangtaoyangjipeichenyongqiao socbalancingstrategyfordistributedenergystorageunitsinisolateddcmicrogridsconsideringcapacitydifferences |