Wind turbine generator pitch angle encoder fault tolerance method based on signal reconstruction

Abstract

The invention provides a wind turbine generator encoder fault tolerance method based on signal reconstruction. The wind turbine generator encoder fault tolerance method comprises the following steps of acquiring data information of a wind turbine generator within a preset time, preprocessing the data information, and identifying a transfer function and a neural network model of a servo mechanism according to the preprocessed data information; and designing a state observer according to the transfer function, setting a gain vector, configuring poles of the state observer in a preset range, verifying the reconstruction performance of the state observer and the accuracy of the neural network model when an encoder is normal, setting a threshold value of a residual error between an encoder measurement value and a state observer reconstruction value, and if the residual error exceeds the threshold value, respectively substituting the encoder measurement value and the state observer reconstruction value into the neural network model at the corresponding wind speed for verification so as to perform corresponding operation on the encoder. According to the method, a neural network model verification link is utilized, and the aim that the pitch angle can still be reconstructed through an algorithm after hardware equipment of the pitch angle encoder of the wind turbine generator breaks down is effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of wind turbine control, in particular to a fault-tolerant method for pitch angle encoders of wind turbines based on signal reconstruction. Background technique [0002] As a non-polluting renewable energy, wind energy has huge economic, social, environmental protection value and development prospect, and its utilization has been highly valued by countries all over the world. Pitch variable technology refers to the use of control technology and power system to change the pitch angle of the blades on the rotor system according to the wind speed and generator speed to achieve the purpose of controlling the output power of the generator. By controlling the pitch angle, the variable-pitch wind turbine can stabilize the output power, reduce the torque oscillation, and reduce the vibration of the nacelle, which not only optimizes the output power, but also effectively reduces the noise, stabilizes the output power...

AI Technical Summary

Problems solved by technology

However, wind turbines operate in a harsh environment, which can easily lead to encoder failure. Although a backup encoder is usually redundantly configured in a wind turbine, it may still occur that the main encoder and the backup encoder are at the same time due to the harsh environment. Failure situation

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