Wind power structure working mode parameter identification method considering strong harmonic interference

Abstract

The invention provides a wind power structure working mode parameter identification method considering strong harmonic interference. The method is characterized by assuming that harmonic excitation of a fan in a specific time period has a constant time invariant property in a frequency domain; making clear harmonic components included in the vibration information; adding one or more constant harmonic information matrixes corresponding to interference harmonics to a fixed position in an original structure system characteristic matrix in SSI; and reconstructing and promoting to establish an HM-SSI for modal identification, thereby ensuring that a characteristic value matrix diagonal after system decomposition comprises known harmonic information, indirectly enabling a structure inherent modal composition to be distinguished from the interference harmonic component on the matrix diagonal information and realizing precise identification of wind power structure working mode parameters. The method not only solves the problem of wind power structure working mode parameter identification under strong harmonic interference, but also provides necessary method support and technical support for real-time online monitoring and operational safety assessment of the fan and has good engineering applicability and application value.

Description

technical field [0001] The invention belongs to the technical field of wind power engineering, and relates to a wind power structure working modal parameter identification method considering strong harmonic interference, which is a method for accurately identifying structural working modal parameters by eliminating the influence of impeller strong harmonic excitation under the running state of the fan methods and ideas. Background technique [0002] Faced with many problems such as the continuous shortage of international energy supply and environmental pollution caused by bio-fossil energy, countries around the world have stepped up efforts to develop clean and renewable energy. Due to its large reserves, renewable, clean and non-polluting characteristics, wind energy has become a field with great development potential in new energy sources, and has attracted more and more attention from all over the world. Structural working modal parameters can be used to characterize th...

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Problems solved by technology

At the same time, since the working modal frequency of wind power structures is usually close to the harmonic components of the conversion frequency, the modal information generated by the structure under the excitation of continuous environmental loads will be submerged in the harmonic signals, which greatly affects the accuracy of working modal identification

At present, to deal with the harmonic interference problem in the identification of structural working modes in the operating state, the methods in the prior art mainly filter out the harmonic components in the signal, and improve the traditional However, the above methods have certain deficiencies and defects in engineering applications.

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