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Control technology for grid-forming energy storage under unbalanced working conditions of weak current networks
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Xianmiao HUANG1, Yichi SHAO1, Yu GONG1, Di LIU1, Xuesen ZHU1, Jialin LUO2
Thermal Power Generation | 2024, 53(8) : 59 - 67
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Thermal Power Generation | 2024, 53(8): 59-67
• Operation control technology of grid-forming energy storage technology •
Control technology for grid-forming energy storage under unbalanced working conditions of weak current networks
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Xianmiao HUANG1, Yichi SHAO1, Yu GONG1, Di LIU1, Xuesen ZHU1, Jialin LUO2
Affiliations
  • 1.Electric Power Science Research Institute, State Grid Jibei Electric Power Co., Ltd., Beijing 100045, China
  • 2.College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Published: 2024-08-25 doi: 10.19666/j.rlfd.202403055
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The impedance inside weak current network is large, and when unbalanced loads are connected, it is unable to maintain the stability of its own voltage, resulting in three-phase voltage imbalance and output power fluctuations. Virtual synchronous generator (VSG) technology, as a grid-forming control, can provide support for voltage of the weak current network. However, under the connection of unbalanced loads, the VSG technology cannot maintain output voltage balance. To solve this problem, an improved VSG sequence decoupling control strategy is proposed. Firstly, the principle of three-phase imbalance and power fluctuation in VSG output voltage caused by unbalanced load connection is investigated. Secondly, a dual synchronous coordinate system decoupling (DDSRF) is adopted to separate the positive and negative sequence voltages of the power grid, and a positive and negative sequence control strategy is employed to control the negative sequence voltage component in dq rotating coordinate system. Finally, a VSG simulation model is built and the simulation results indicate that the proposed improved VSG sequential decoupling control strategy can suppress the unbalanced voltage output of the VSGs.

grid-forming control  /  energy storage  /  VSG  /  unbalanced control
Xianmiao HUANG, Yichi SHAO, Yu GONG, Di LIU, Xuesen ZHU, Jialin LUO. Control technology for grid-forming energy storage under unbalanced working conditions of weak current networks[J]. Thermal Power Generation, 2024 , 53 (8) : 59 -67 . DOI: 10.19666/j.rlfd.202403055
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  • Science and Technology Project of State Grid Jibei Electric Power Co., Ltd.(52018K23000G)
Appendix
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Year 2024 volume 53 Issue 8
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144
68
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Article Info
doi: 10.19666/j.rlfd.202403055
  • Receive Date：2024-03-30
  • Online Date：2026-01-07
  • Published：2024-08-25
Article Data
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History
  • Received：2024-03-30
Funding
Science and Technology Project of State Grid Jibei Electric Power Co., Ltd.(52018K23000G)
Affiliations
    1.Electric Power Science Research Institute, State Grid Jibei Electric Power Co., Ltd., Beijing 100045, China
    2.College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
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