A kind of wind power generator load reduction method

Abstract

A wind turbine load reduction method, when the first speed factor exceeds a threshold and the second speed factor is greater than 0, then add positive additional pitch speed for the wind generator, and add positive additional pitch speed to the wind generator After pitching speed, when the second speed factor becomes less than 0, add negative additional pitching speed for wind turbine. The invention suppresses the overspeed of the generator under the extreme wind speed, accelerates the feathering speed of the unit, and retracts the propellers in time after the feathering speed is accelerated, so as to avoid large loads.

Description

technical field [0001] The invention relates to a load reduction method for a wind power generator. Background technique [0002] With the continuous advancement of wind turbine technology, the length of blades is also increasing. In the design stage of wind turbines, it is found that large loads often occur under the conditions of sharply increased wind speed and sharply changed wind direction, which is mainly reflected in the hub coordinate system. m YN direction. Wind turbines have several different coordinate systems, the hub coordinate system, the blade root coordinate system, and the tower coordinate system. Taking the hub center as the zero point, the stationary hub coordinate system is as follows: figure 1 As shown, M stands for torque, F stands for force, N stands for norotaing, non-rotating, that is, static direction. For steady-state calculations, the wind is considered to be blowing from the north, and the origin is at the center of the hub (the intersection ...

AI Technical Summary

Problems solved by technology

However, after feathering, the sharp change of wind direction may lead to a larger windward area of ​​the wind turbine, causing the wind turbine to bear a larger load. At this time, the hub M YN The directional load is likely to exceed the design load, resulting in an accident

In order to meet the load requirements, it is necessary to increase the model of the hub or replace other parts with better quality, resulting in an increase in production costs. In the current era of wind turbine parity, this is obviously very unfavorable for wind turbine manufacturers.

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