Virtual damping control method for tower of large wind turbine unit

Abstract

A virtual damping control method for a tower of a large wind turbine unit comprises the following steps that 1, a vibration acceleration magnitude in the left-right direction of the top of the tower is measured; 2, the measured vibration acceleration magnitude in the left-right direction of the top of the tower is integrated to obtain vibration speed values in the left-right direction of the top of the tower; 3, band-pass filtering and band-stop filtering are carried out on the vibration speed values in the left-right direction of the top of the tower; 4, after filtering, a pitch angle expected value on a fixed coordinate axis is output through a controller; 5, the azimuth angle of a wind wheel is measured, and transmitted to an input module of a wind turbine generator main controller; 6, Park inverse transformation is carried out on the expected pitch angle on the fixed coordinate axis to obtain pitch angle compensation values of all peddles; and 7, the expected pitch angle of a wind turbine generator is compensated according to the pitch angle compensation values, obtained through Park inverse transformation, of all the peddles, the peddles are controlled to act through a variable pitch control system, and virtual damping control over the tower is achieved. The requirement for variable pitches is lowered, abrasion of a variable pitch bearing and a speed reducer is small, and the control effect is good.

Description

technical field [0001] The invention relates to wind power generation control technology, in particular to a virtual damping control method for a tower of a large-scale wind turbine. Background technique [0002] At present, the unit capacity of wind turbines and the diameter of wind rotors are getting larger and larger, and the corresponding tower heights are also getting higher and higher. Some wind turbines have adopted towers with a height of more than 120m. In order to reduce the cost of the tower and at the same time consider avoiding the resonance of the unit, large-scale wind turbines usually adopt a flexible tower, that is, within the entire operating speed range of the wind turbine, the first-order modal frequency of the tower satisfies 1 times the rotation frequency (1P) and 3 According to the requirements of the GL2010 standard, the tower frequency f t Requirement to meet: 1.05P≤f t ≤2.95P. As the height of the tower increases, the tower becomes more and more ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing wind turbine tower virtual damping control method, which have higher requirements on pitch, greater wear of pitch bearings and reducers, and poor control effects, the present invention provides a method that reduces the requirements on pitch, variable Virtual damping control method for large-scale wind turbine tower with less wear of propeller bearing and reducer and good control effect

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