Wind driven generator variable-pitch transmission gear fault diagnosis method based on current signals

Abstract

The invention relates to a wind driven generator variable-pitch transmission gear fault diagnosis method based on current signals. The method comprises the following steps: acquiring variable-pitch gear transmission system driving shaft motor stator current signals; preprocessing the motor stator current signals to enable the motor stator current signals to meet the requirements of a monitoring system; acquiring a low-frequency part where the fundamental frequency of the motor stator current signals is located; acquiring the continuous instantaneous frequency of the low-frequency part where the fundamental frequency of the current signals is located; acquiring the instantaneous angle of a driven gear according to the continuous instantaneous frequency conversion, and carrying out equal-angle cyclic rooting to obtain equal-angle sampling solutions; summing the equal-angle sampling solutions to obtain a current signal in an angular domain, and eliminating the influence generated by speedfluctuation; performing data processing on the current signal in the angular domain by using a data analysis method to obtain a spectrogram; and judging that a fault of the transmission gear exists when a fault side frequency peak value is detected between two frequency multiplication component peak values of the spectrogram.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a method for fault diagnosis of pitch transmission gears of wind power generators based on current signals. Background technique [0002] In recent years, the issue of global warming has been paid more and more attention. Clean energy is the core issue for coping with global climate change and realizing sustainable energy supply. Wind power generators have achieved rapid development for decades, especially in recent years when the focus of wind power construction has shifted from land to sea. The grid-connected scale of wind power has become larger and larger, and the single-unit capacity and blade size of wind turbines have also increased day by day. After decades of rapid development of wind turbines, the life cycle of wind turbines is generally 20 to 30 years. Some units in existing wind farms have entered the middle and late stages of operation and maintenance. In ad...

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Problems solved by technology

[0007] The existing technical solutions have the following technical defects: additional sensors for the monitoring system are required, which not only increases the cost but also has the risk of failure of the sensors themselves; the integration of the monitoring system and the control system has not been realized, which restricts the development of smart wind power. field construction; there is a lack of theoretical explanation and experimental research for fault diagnosis under the actual working conditions of variable speed and variable load

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