Effects and correction of transition cycles on fatigue assessment of wind turbine

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 241-246.

ZHAO Yan1,2, YANG Zhe1, WANG Xinwu2,3, LI Xiaolu3, CHEN Feng4

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Abstract

With the increasing of the installed capacity and dimension of the wind turbine, its operating environment is more complex and the fatigue problem is prominent. So it is necessary to accurately predict the actual fatigue damage suffered by the wind turbine structure. Through long-term monitoring of tower bottom strain of 1.5MW wind turbine, the accuracy of different methods in dealing with residue series after rainflow counting is studied. First, the influence of transition cycles on fatigue damage was studied using different window lengths. The shorter the selected window length is, the greater the fatigue damage error is. When the window length was 10min, the error reached 20.7%. Then, residue concatenation methodology was used to process residue series. At this time, the damage values obtained by selecting different window lengths were the same as those obtained by taking all data in the monitoring period as continuous series, which proved the accuracy of this method in processing residue series. The results provide a solution for the online prediction of fatigue damage of wind turbine structures, and can obtain the fatigue damage in real time more accurately.

Key words

wind turbine / fatigue damage / rainflow counting method / residue series / transition cycles / residue concatenation methodology

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ZHAO Yan1,2, YANG Zhe1, WANG Xinwu2,3, LI Xiaolu3, CHEN Feng4. Effects and correction of transition cycles on fatigue assessment of wind turbine[J]. Journal of Vibration and Shock, 2024, 43(3): 241-246

References

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