Coordinated Frequency Regulation between DFIG-VSWTs and BESS Hybrid Systems

Baolong Nguyen Phung, Yuan-Kang Wu () and Manh-Hai Pham
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Baolong Nguyen Phung: Department of Electrical Engineering, National Chung-Cheng University, Chiayi 621301, Taiwan
Yuan-Kang Wu: Department of Electrical Engineering, National Chung-Cheng University, Chiayi 621301, Taiwan
Manh-Hai Pham: Department of Energy Technology, Electric Power University, Hanoi 11917, Vietnam

Energies, 2024, vol. 17, issue 13, 1-27

Abstract: As the utilization of wind power systems continues to increase, reducing overall system inertia, there is a consequential negative impact on the power system’s ability to regulate frequency. Consequently, this study focuses on examining the fast-frequency regulation in high penetration of wind power, especially doubly fed induction generators—the most commonly installed wind turbine type, and an energy storage system installed in the wind farm. This study proposes a coordinated control of wind turbine generators and battery energy storage systems that provides fast-frequency regulation to the system while simultaneously ensuring the safety of the battery. Firstly, the fast-frequency regulation capability of the wind turbine will be studied. Secondly, primary frequency control of the battery energy storage system considering adaptive droop control based on state of charge is proposed to prevent both over-charging and over-discharging of the battery. Finally, this study proposed a coordinated fast-frequency regulation approach for the hybrid wind-storage system, which is evaluated under various wind speed scenarios. This approach involves a detailed analysis of the operational characteristics of the wind turbine generators to ensure optimal performance. The proposed method is validated through simulation using a MATLAB model of the wind-storage system, and comparative results with alternative control methods confirm the effectiveness of the proposed approach in raising the frequency nadir and avoiding the secondary frequency dip.

Keywords: DFIG-VSWTs; wind turbine control; frequency regulation; battery energy storage systems; state-of-charge droop control; secondary frequency dip (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: 2024
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