For the wind power generation system, the blade of the wind turbine is directly related to the safety and reliability of the whole system. Monitoring its health based on stress analysis is something that needs to be addressed. Due to high sensitivity, anti‐electromagnetic interference, and small size and lightweight, fiber Bragg grating (FBG) sensors become the ideal choice for wind turbine blade strain monitoring (WTBSM). For the harsh operating environment of wind turbine blades and the demand for high precision in stress testing, the quasi‐distributed fiber grating stress sensing system based on angle sensors was designed. In this paper, the problem is solved by introducing the angle of fan rotation. The real‐time angle data of the blade collected by the angle sensor is used to determine whether the change of the central wavelength of the FBG is caused by temperature. To verify the effectiveness of the algorithm, the sensor was installed and operated in the wind turbine No. 104 in Qiyue Mountain III, Lichuan City, Hubei Province, China. Compared to the strain data without angle sensor correction, the signal data from the angle‐based stress sensor has less than half the original noise. The research has provided a method for evaluating the stress of wind turbine blades, which will be expected to be applied in wind turbine systems, and also lays the foundation for later research on blade damage.
Chen et al. (Thu,) studied this question.