On-line early warning method of wind turbine generating unit on fluctuation working condition

Abstract

The invention discloses an on-line early warning method of a wind turbine generating unit on a fluctuation working condition, and belongs to the technical field of precognition judgment of early-stage potential hidden danger of safe operation of rotating machinery. The on-line early warning method of the wind turbine generating unit on the fluctuation working condition comprises the steps that (1) a reasonable vibration monitoring scheme is made according to the wind turbine generating unit, and frequency components contained by vibration monitoring points are analyzed; (2) vibration time-domain signals collected at equal intervals are converted into corresponding angular-domain signals collected at equal intervals, and the number of sampling points of equal-angle sampling is determined, namely the vibration data volume, needed to be collected in each circle, of a rotor is determined; (3) a linear interpolation algorithm is used for converting unstable time-domain vibration signals into angular-domain vibration signals with the characteristic of stability, and the complete-period characteristic of the vibration signals is ensured. The on-line early warning method of the wind turbine generating unit on the fluctuation working condition constructs dimensionless amplitude-domain parameters which are sensitive to early faults and can accurately reflect faults of the wind turbine generating unit according to the variable-working-condition characteristic, achieves accurate extraction of early fault characteristics of a transmission chain of the wind turbine generating unit, and achieves graded early warning in the gradual-change fault mode and precognition early warning in the mutability fault mode.

Description

technical field [0001] The invention belongs to the technical field of predicting and judging potential hidden dangers in the early stage of safe operation of rotating machinery, and in particular relates to an online early warning method for wind turbines under fluctuating working conditions. Background technique [0002] Due to its low pollution, low energy consumption and sustainable development, wind power technology has become an indispensable mainstream energy in the world's energy wave. With the development of wind turbines in the direction of large single-unit capacity, the structure and functions of wind power equipment are becoming more and more complex. Wind power companies have higher and higher requirements for the normal, safe and stable operation of equipment. Wind power companies must continuously improve the operation and maintenance level of the units. To ensure the efficient and safe operation of wind turbines. [0003] Due to the high purchase cost of wi...

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