Vibration fault diagnosis method for doubly-fed wind turbine

Abstract

The invention discloses a vibration fault diagnosis method for a doubly-fed wind turbine. The method comprises the steps: extracting the fault characteristics of the bearing by performing spectrum andenvelope spectrum analysis on the vibration data, and determining whether the vibration fault is caused by a mechanical fault if the vibration fault of a tested double-fed wind turbine occurs; determining whether a three-phase unbalance occurs by extracting a voltage and current signal during the operation of the turbine stator, and determining whether the vibration fault is caused by an electrical fault; performing dielectric loss factor and capacitance measurement on the stator windings to determine whether the three-phase unbalance is caused by an insulation degradation if the electrical fault occurs; and stopping the turbine and performing a shock waveform test to determine the fault phase of the insulation degradation of the tested turbine stator if the insulation degradation occurs.The method comprehensively diagnose the vibration fault by combining the vibration signal with the electrical signal, so that the defects and deficiencies of the single monitoring signal are overcome, the accuracy of the diagnosis result is improved, the diagnosis of the phase of the insulation fault of the stator can be realized, and the difficulty of the repairing and maintaining the wind turbine can be reduced.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of wind power, and in particular relates to a vibration fault diagnosis method of a doubly-fed wind power generator. Background technique [0002] The development of wind power generation is extremely rapid, which makes the operation safety of wind farms more and more concerned. As a key component in wind turbines that directly converts energy, wind turbines have a direct impact on the reliability, stability and service life of the units. overall performance. According to the latest European data, currently operating wind turbines have at least one failure per year, and the annual failure rate of offshore wind turbines has reached 0.5, especially for wind turbines above 2MW. In China, the failure rate of wind turbines is much higher than the world average. [0003] According to the operation data, the vibration failure of the wind turbine is one of the main reasons for the damage and outage of the...

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Problems solved by technology

[0005] Based on the problems existing in the above-mentioned prior art, the object of the present invention is to provide a vibration fault diagnosis method of a doubly-fed wind power generator, which combines the vibration signal with the electrical signal, overcomes the defects and insufficiencies of a single monitoring signal, and improves the diagnostic accuracy. The accuracy of the results can realize the diagnosis of the stator insulation fault phase, which can reduce the difficulty of wind turbine maintenance and maintenance.

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