A Coordinated Frequency Regulation Strategy Integrating Power Generation, Energy Storage, and DC Transmission for Offshore Wind Power MMC-HVDC Transmission Systems

Yangqing Dan, Chenxuan Wang, Keheng Lou, Jinhua Huang, Guoteng Wang, Zheng Xu and Ying Huang ()
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Yangqing Dan: Center of Power Grid Planning, Economic Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310008, China
Chenxuan Wang: Center of Power Grid Planning, Economic Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310008, China
Keheng Lou: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Jinhua Huang: Center of Power Grid Planning, Economic Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310008, China
Guoteng Wang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Zheng Xu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Ying Huang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2025, vol. 18, issue 3, 1-13

Abstract: With the increasing proportion of renewable energy in power grids, the inertia level and frequency regulation capability of modern power systems have declined. In response, this paper proposes a coordinated frequency regulation strategy integrating power generation, energy storage, and DC transmission for offshore wind power MMC-HVDC transmission systems, aimed at improving the frequency stability of onshore power grids. First, considering the inability of the receiving-end MMC-HVDC converter station under constant DC voltage control to directly respond to AC system frequency variations, a frequency regulation method is developed based on constant DC voltage control. The approach employs DC voltage as a transmission signal to coordinate the responses of wind turbines and energy storage systems. Subsequently, based on the energy storage configuration of the onshore renewable energy aggregation station, a secondary frequency regulation strategy is proposed. This strategy integrates offshore wind power, MMC-HVDC transmission system, and energy storage systems, balancing AC frequency regulation and the recovery of the state of charge (SOC) of the energy storage system. Finally, the proposed method is tested on a modified IEEE 39-bus system, the results demonstrate that the minimum frequency value can be in-creased by 37.5%, the system frequency can be restored to the initial state after secondary FM, and the results demonstrate its effectiveness.

Keywords: offshore wind power; MMC-HVDC transmission system; frequency stability; Frequency modulation strategy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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