A wind turbine impeller unbalance detection method based on stator current envelope spectrum

Abstract

The invention discloses a wind turbine impeller imbalance detection method based on the stator current envelope spectrum, comprising the following steps: collecting stator current signals, processing the collected generator stator current signals, constructing sample databases, constructing neural network models, Detect the database, deliver sample data, identify and judge, and output results. The present invention uses the convolutional neural network model and the Hilbert demodulation method to extract the stator current envelope spectrum data and learn the fault characteristics during the operation of the wind turbine, and can adaptively capture the fault characteristics from the signal, avoiding the Uncertainty interference caused by environmental noise, fluctuations, and human judgment errors has high recognition accuracy. At the same time, data acquisition does not require the installation of additional sensors, which reduces test costs. Data acquisition is less affected by the environment and has a high accuracy rate. It can effectively avoid the troubles caused by natural environmental factors to model judgment, and is suitable for complex operating conditions of wind turbines.

Description

technical field [0001] The invention relates to the field of wind turbines, in particular to a method for detecting the unbalance of a wind turbine impeller based on a stator current envelope spectrum. Background technique [0002] Wind turbines have been operating in the field for a long time, and the outdoor operating environment is usually relatively harsh. Therefore, this environment has caused a high failure rate of wind turbines, and the reasons for the failures are various. For example, the blades will cause the mass imbalance of the impeller due to wind and sand, icing and uneven mass distribution. In addition, the blades will also have cracks due to fatigue stress during long-term operation, resulting in the problem of aerodynamic imbalance of the impeller. [0003] In recent years, my country's wind power industry has developed rapidly, and the grid-connected capacity of wind turbines has continued to increase. In particular, the planning of offshore wind turbines ...

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