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Periodic Power Fluctuation Smoothing Control Using Blade Inertia and DC-Link Capacitor in Variable-Speed Wind Turbine

Author

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  • Jin-Ho Do

    (Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea)

  • Ye-Chan Kim

    (Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea)

  • Seung-Ho Song

    (Department of Electrical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea)

Abstract

Due to the structural aspects of the wind turbine, such as wind shear and tower shadow effects, the output power of the wind turbine has periodic fluctuations, known as 3P fluctuations. These fluctuations can reduce overall power generation and deteriorate power quality. In this context, this paper proposes a power smoothing control method that utilizes rotor inertia and a DC-link capacitor as small-scale energy storage devices. First, the typical energy storage capacities of the rotor’s rotational kinetic energy and the DC-link capacitor’s electrostatic energy are analyzed to assess their smoothing potential. Secondly, a control method is presented to apply the rotor and the DC-link capacitor as small-scale energy storage, with the smoothing frequency range allocated according to their respective storage capacities. Finally, the proposed method is compared with the conventional maximum power point tracking (MPPT) method and the 3P-notch filter method. The effectiveness of the proposed algorithm is verified through MATLAB/Simulink simulations, demonstrating its capability to mitigate periodic power fluctuations. The results showed that the proposed control method is applicable, reliable, and effective in mitigating periodic power fluctuations.

Suggested Citation

  • Jin-Ho Do & Ye-Chan Kim & Seung-Ho Song, 2025. "Periodic Power Fluctuation Smoothing Control Using Blade Inertia and DC-Link Capacitor in Variable-Speed Wind Turbine," Energies, MDPI, vol. 18(14), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:14:p:3763-:d:1702884
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    References listed on IDEAS

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    1. Fernández-Guillamón, Ana & Gómez-Lázaro, Emilio & Muljadi, Eduard & Molina-García, Ángel, 2019. "Power systems with high renewable energy sources: A review of inertia and frequency control strategies over time," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
    2. Guisheng Yang & Lijuan Chen & Pengyang Cai & Wei Gao & Chao Ai, 2024. "Adaptive Disturbance Rejection and Power Smoothing Control for Offshore Hydraulic Wind Turbines Based on Pitch and Motor Tilt Angles," Energies, MDPI, vol. 17(24), pages 1-18, December.
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