BLADE LOAD TESTING AND IDENTIFICATION OF IN-SERVICE WIND TURBINES UNDER STEADY STATE CONDITIONS

Zhou Bo; Zhang Lixin; Bao Hongbing; Yu Zhiqiang

doi:10.19912/j.0254-0096.tynxb.2024-0243

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 597-606. DOI: 10.19912/j.0254-0096.tynxb.2024-0243

BLADE LOAD TESTING AND IDENTIFICATION OF IN-SERVICE WIND TURBINES UNDER STEADY STATE CONDITIONS

Zhou Bo^1,2, Zhang Lixin², Bao Hongbing³, Yu Zhiqiang³

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Abstract

The problem of blade load testing and identification are discussed for onshore wind turbines operating under steady state conditions. Firstly, the load test scheme is designed based on the equivalent fatigue load theory and strain load measurement technology. According to the load measurement requirements, data acquisition, sensor layout and calibration are carried out to build the blade monitoring system. Secondly, the strain gauges are used in the blade monitoring system to obtain the test load under steady state conditions. In the blade monitoring system, the wind characteristic information from wind tower and radar is collected synchronously. At the same time, the wind turbine control state information is obtained by the SCADA system. The simulation load is obtained according to the wind speed capture matrix. Since the test load data duration is different from that of the design load, the design load, test load and simulation load are converted to equivalent fatigue load at 1Hz for comparison. The results show that the ratio of test load and design load of the same section is in the range of 104.0%-130.2%, which meets the safety margin of blade load design. The test load and simulation load of the same section are quite different, indicating that the dynamic change of load monitoring under steady state condition is strongly related to turbulence intensity. Therefore, it is necessary to monitor wind shear and turbulence parameters to reflect the actual load, which can prevent overload operation effectively.

Key words

wind turbine blades / load testing / strain measurement / steady state condition / equivalent fatigue load

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Zhou Bo, Zhang Lixin, Bao Hongbing, Yu Zhiqiang. BLADE LOAD TESTING AND IDENTIFICATION OF IN-SERVICE WIND TURBINES UNDER STEADY STATE CONDITIONS[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 597-606 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0243

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