Method and device for identifying pitch angle deviation of blade and method and device for controlling wind generating set

Abstract

The invention provides a method and device for identifying a pitch angle deviation of a blade and a method and device for controlling a wind generating set. The method for identifying the pitch angledeviation of the blade comprises the following steps of: acquiring operation data of a wind generating set; based on the obtained operation data, determining an energy amplitude of a vibration signalof the wind generating set under the one-time rotation frequency of an impeller and the energy amplitude of the vibration signal of the wind generating set under the three-time rotation frequency of the impeller; and based on the determined energy amplitudes under the one-time rotation frequency and the three-time rotation frequency of the impeller, determining an absolute deviation angle of a current pitch angle of the blade by using a pre-established specific mathematical model, wherein the absolute deviation angle of the current pitch angle of the blade is the deviation between the currentpitch angle of the blade and the optimal pitch angle.

Description

technical field [0001] The present invention generally relates to the technical field of wind power generation, and more specifically relates to a method and device for identifying blade pitch angle deviation and controlling a wind power generating set. Background technique [0002] Usually in the design simulation stage of wind turbines, the control parameters of wind turbines are designed according to the mathematical model of the whole machine (involving blades, towers, pitch, and flow conversion systems, etc.), including the most important parameters of wind turbines. Optimal pitch angle parameters. When the wind turbine is running, if the output power of the wind turbine is less than the rated power, the pitch angle of the blades is fixed at the optimal pitch angle so that the blades can obtain the maximum energy from the wind. [0003] However, during on-site installation, due to installation errors or errors, there may be a deviation between the actual pitch angle of...

AI Technical Summary

Problems solved by technology

[0006] An exemplary embodiment of the present invention is to provide a method and device for identifying the blade pitch angle deviation and controlling the wind power generating set, so as to solve the problem in the prior art that the actual pitch angle of the blade and the optimal pitch angle cannot be automatically and conveniently identified. The problem of deviation between distance and angle

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