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Maximum Circulating Current Power Control for Phase-to-phase SOC Balance Applied to Three-phase Chain-link Energy Storage Converter
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Chunlai YANG1, Xiaolei YUAN1, Weijie HAO2, Zhe YIN1, Jianfeng LI1, Zhizhong KAN2
Journal of Power Supply | 2025, 23(2) : 75 - 85
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Journal of Power Supply | 2025, 23(2): 75-85
• Modeling and Control •
Maximum Circulating Current Power Control for Phase-to-phase SOC Balance Applied to Three-phase Chain-link Energy Storage Converter
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Chunlai YANG1, Xiaolei YUAN1, Weijie HAO2, Zhe YIN1, Jianfeng LI1, Zhizhong KAN2
Affiliations
  • 1 Electric Power Research Institute, State Grid Hebei Electric Power Co., Ltd., Shijiazhuang 050021, China
  • 2 Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China
Published: 2025-03-30 doi: 10.13234/j.issn.2095-2805.2025.2.75
Outline
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Three-phase chain-link energy storage converters (TPCLESCs) are promising in enhancing the controllability of renewable energy in power grid, such as wind and solar power. Aimed at the problem of state-of-charge (SOC) imbalance of energy storage battery among phases of a TPCLESC, a phase-to-phase SOC balance method based on phase-to-phase circulating current power closed-loop control is proposed. Through the zero-sequence voltage injection into phases a, b and c, the active circulating current among phases is generated to realize the SOC balance in the three-phase energy storage battery groups. A mathematical model of the maximum phase-to-phase circulating current power of the chain-link energy storage converter and SOC deviation is established. On this basis, the phase-to-phase SOC balance in battery groups is realized at the maximum circulating current power through the phase-to-phase circulating current active power closed-loop control. As a result, the phase-to-phase SOC reaches its balance at the maximum speed, and the process of phase-to-phase SOC balance is accelerated. Finally, the correctness and feasibility of the proposed method were verified by a MATLAB simulation model and an experimental platform.

Zero-sequence voltage injection  /  state-of-charge (SOC) balance  /  grid-connected system  /  phase-to-phase circulating current power
Chunlai YANG, Xiaolei YUAN, Weijie HAO, Zhe YIN, Jianfeng LI, Zhizhong KAN. Maximum Circulating Current Power Control for Phase-to-phase SOC Balance Applied to Three-phase Chain-link Energy Storage Converter[J]. Journal of Power Supply, 2025 , 23 (2) : 75 -85 . DOI: 10.13234/j.issn.2095-2805.2025.2.75
Funding
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  • State Grid Hebei Electric Power Co., Ltd. Science and Technology Project(kj2021-047)
Appendix
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Year 2025 volume 23 Issue 2
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.2.75
  • Receive Date：2022-02-18
  • Online Date：2025-07-01
  • Published：2025-03-30
Article Data
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History
  • Received：2022-02-18
  • Revised：2022-07-09
  • Accepted：2022-07-15
Funding
State Grid Hebei Electric Power Co., Ltd. Science and Technology Project(kj2021-047)
Affiliations
    1 Electric Power Research Institute, State Grid Hebei Electric Power Co., Ltd., Shijiazhuang 050021, China
    2 Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China
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