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Hybrid DC Energy-consuming Device for Offshore Wind Power DC Transmission System and Its Modulation Strategy
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Feng LI1, Sui PENG1, Yanfeng WANG1, Hao YU1, Zijun REN2, Xiaohui QU  Member, CPSS2
Journal of Power Supply | 2025, 23(6) : 218 - 226
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Journal of Power Supply | 2025, 23(6): 218-226
• Renewable Energy System •
Hybrid DC Energy-consuming Device for Offshore Wind Power DC Transmission System and Its Modulation Strategy
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Feng LI1, Sui PENG1, Yanfeng WANG1, Hao YU1, Zijun REN2, Xiaohui QU  Member, CPSS2
Affiliations
  • 1.Grid Planning and Research Center, Guangdong Power Grid Corporation, Guangzhou 510180, China
  • 2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
Published: 2025-10-30 doi: 10.13234/j.issn.2095-2805.2025.6.218
Outline
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In a flexible DC transmission system for offshore wind power generation, surplus power will be generated in the system when the land end is greatly unloaded or the AC system fails, resulting in a rapid increase in the DC transmission voltage. A DC energy-consuming device can quickly dissipate the surplus power, which is a key technical solution to ensuring smooth fault ride-through and reliable operation of the system. However, the modulation voltage of the energy-consuming valve will become negative when the surplus power is large. To solve this problem, a hybrid DC energy-consuming device based on half-bridge and full-bridge sub-modules and its modulation strategy are proposed in this paper. By using the negative-voltage output capability of the full-bridge sub-module, the matching range of the surplus power can be expanded, and the recovery speed of DC voltage can be speeded up. The effectiveness of the proposed energy-consuming device and its modulation strategy is verified through theoretical analysis. Besides, a simulation model of the offshore wind power flexible DC transmission system was built on a PSCAD/EMTDC electromagnetic transient simulation platform, and the feasibility of the proposed DC energy-consuming device and corresponding modulation strategy was verified under conditions of different values of surplus power.

Offshore wind power  /  flexible DC transmission system  /  surplus power  /  DC energy-consuming device  /  modulation strategy
李峰, 彭穗, 王彦峰, 余浩, 任子俊, 曲小慧中国电源学会会员. 海上风电直流送出用混合型直流耗能装置及调制策略. 电源学报, 2025 , 23 (6) : 218 -226 . DOI: 10.13234/j.issn.2095-2805.2025.6.218
Feng LI, Sui PENG, Yanfeng WANG, Hao YU, Zijun REN, Xiaohui QU. Hybrid DC Energy-consuming Device for Offshore Wind Power DC Transmission System and Its Modulation Strategy[J]. Journal of Power Supply, 2025 , 23 (6) : 218 -226 . DOI: 10.13234/j.issn.2095-2805.2025.6.218
Funding
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  • Technology Project of China Southern Power Grid Co., Ltd.(037700KK52220013)
  • National Natural Science Foundation of China(52077038)
Appendix
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Year 2025 volume 23 Issue 6
65
4
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Article Info
doi: 10.13234/j.issn.2095-2805.2025.6.218
  • Receive Date：2023-04-03
  • Online Date：2026-10-26
  • Published：2025-10-30
Article Data
Affiliations
History
  • Received：2023-04-03
  • Revised：2023-05-24
  • Accepted：2023-07-11
Funding
Technology Project of China Southern Power Grid Co., Ltd.(037700KK52220013)
National Natural Science Foundation of China(52077038)
Affiliations
    1.Grid Planning and Research Center, Guangdong Power Grid Corporation, Guangzhou 510180, China
    2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
References
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https://castjournals.cast.org.cn/joweb/dyxb/EN/10.13234/j.issn.2095-2805.2025.6.218
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