Method and system used for monitoring vibration states of impellers of wind generating sets

Abstract

The invention provides a method and system used for monitoring the vibration states of impellers of wind generating sets. The method includes the steps that the vibration acceleration of a predetermined measuring point on a vane of each wind generating set in at least one direction is detected according to a preset detection period, data of operating parameters of at least one of the wind generating sets are synchronously acquired, and the acquired data of the operating parameters of the set and the detected vibration acceleration data are recorded; data sets of recorded operating parameter data and recorded vibration acceleration data exceeding the preset amount are selected; according to the operating parameters of the wind generating sets, vibration acceleration data detected when the wind generating sets are in abnormal working conditions are removed from the data sets; operating mode analysis is carried out on the vibration acceleration data detected at the measuring points of the vanes, at least one of the inherent frequency, the damping ratio and the vibration mode of each vane in the operating state is extracted, and whether the impellers of the wind generating sets break down or not are determined according to the extracted inherent frequency, damping ratio and vibration mode.

Description

technical field [0001] The invention relates to a state monitoring technology of an impeller of a wind generating set, in particular to a method and a system for monitoring the vibration state of an impeller of a wind generating set. Background technique [0002] The impeller of the wind turbine mainly includes blades and hubs; the blades are the components for the wind generator to absorb wind energy, and the hubs are the components for installing the blades and the fan pitch mechanism. [0003] From the dynamics and load analysis of the whole machine, the impeller (including blades) bears more than 90% of the load of the whole machine, and the force is complex and the environmental conditions are harsh, especially the blade is the most complicated component. The blades rotate continuously, the load is alternating and random, and various exciting forces are transmitted through the blades. Therefore, the impeller is the most prone to major failures of the wind turbine, such...

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Problems solved by technology

The advantage of these methods is that the target is clear and direct. When a certain mechanical index exceeds the design value, the blade may fail, but the disadvantages are more prominent: on the one hand, the optical fiber sensor and the corresponding data acquisition equipment are expensive; on the other hand, the deformation of the strain gauge The signal is easily disturbed, and at the same time it is not very sensitive to the excitation force. For the nonlinear material of the blade, if you want to get the mechanical information, you need to carry out the experimental calibration

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