FREQUENCY RESPONSE STRATEGY FOR DOUBLY-FED WIND FARM CONSIDERING MIAN SHAFT FATIGUE LOAD

Liu Xin; Wang Hanbo; Liu Yingming; Wang Liming; Sun Lingyu

doi:10.19912/j.0254-0096.tynxb.2024-1399

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 418-427. DOI: 10.19912/j.0254-0096.tynxb.2024-1399

FREQUENCY RESPONSE STRATEGY FOR DOUBLY-FED WIND FARM CONSIDERING MIAN SHAFT FATIGUE LOAD

Liu Xin¹, Wang Hanbo², Liu Yingming³, Wang Liming³, Sun Lingyu¹

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Abstract

To reduce the accumulated fatigue load on the main shaft during frequency response for each doubly-fed wind turbine （DFWT） within a wind farm operating under a virtual synchronous generator （VSG） control strategy, a damping coefficient allocation strategy considering main shaft fatigue load is proposed. First, a load-frequency control model quantifying the dynamic relationship between power variation and frequency variation is established. Second, a discretized model relating the VSG control strategy’s damping coefficient to shaft torque and grid frequency during energy transfer is derived. Based on this model, unit operating status, and grid frequency, an objective function and its constraints are formulated to minimize shaft fatigue load across the wind farm. Finally, the fmincon algorithm within the VSG station controller is employed to solve for the equivalent damping coefficients of each unit online. These equivalent damping coefficients are then converted into damping coefficients allocated to each unit. Simulation results validate the superiority of the proposed allocation strategy.

Key words

wind farm / wind turbines / allocation strategy / frequency response / fatigue load / damping coefficient

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Liu Xin, Wang Hanbo, Liu Yingming, Wang Liming, Sun Lingyu. FREQUENCY RESPONSE STRATEGY FOR DOUBLY-FED WIND FARM CONSIDERING MIAN SHAFT FATIGUE LOAD[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 418-427 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1399

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