Pitch control method and device for wind power generating set

Abstract

The invention provides a variable pitch control method and equipment for a wind turbine generator set. The variable pitch control method comprises the following steps of determining whether a vane ispositioned in an angle range capable of effectively measuring a clearance at present or not; when the vane is positioned in an angle range capable of effectively measuring the clearance, measuring theclearance of the vane positioned in the angle range capable of effectively measuring the clearance at present, and determining whether the measured clearance is smaller than a clearance threshold value or not; when the measured clearance is smaller than the clearance threshold value, in a process that a next adjacent vane is changed into the angle range capable of effectively measuring the clearance from a current position, gradually increasing an additional pitch angle given value of a next adjacent vane to a preset additional pitch angle given value, and obtaining the pitch angle given value of the next adjacent vane; and on the basis of the pitch angle given value of the next adjacent vane, controlling the next adjacent vane to carry out pitch variation. The variable pitch control method can be realized by a low cost, the clearance is increased, a tower-sweeping risk of the vane of the wind turbine generator set under an extreme wind situation can be lowered, and in addition, the electricity generating capacity of the wind turbine generator set is not affected.

Description

technical field [0001] The invention relates to the field of wind power generation control. More specifically, it relates to a pitch control method and device for a wind power generating set. Background technique [0002] The blade is an important part of the wind turbine, which accounts for a large proportion of the cost of the wind turbine, and the weight of the blade is positively related to the cost. Therefore, the lightweight design of the blade is one of the important ways to control the cost of the current wind turbine. However, since the stiffness of the blade will decrease after the blade is lightweight, the amount of deformation will increase, which will increase the risk of blade sweeping. distance from the cylinder surface. At present, the main solution to solve the headroom is to implement independent pitch control on the three blades based on the load of the blade root, so as to improve the headroom. The current clearance solution mainly has the following sh...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pitch control method and equipment for a wind power generating set, so as to solve the technical problems of the existing headroom lifting scheme with high cost or affecting power generation

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