Dynamic control method and system for the blade clearance of the wind turbine generator

Abstract

The invention discloses a dynamic control method and a system for blade clearance of a wind turbine generator. Dynamic control during normal operation of the wind turbine generator is carried out, and the dynamic control method is characterized in that operation characteristics of the wind turbine generator are adjusted in real time according to blade root loads and operation variables of the wind turbine generator, so that thrust loads borne by blades are reduced, and dynamic control over the blade clearance is achieved. According to the dynamic control method and the system for the blade clearance of the wind turbine generator, when the wind turbine generator operates normally, the operation characteristics of the wind turbine generator are adjusted in real time according to the blade root loads and the operation variables of the wind turbine generator, so that the thrust loads borne by the blades are reduced, dynamic control over the blade clearance is achieved, the blade thrust loads are reduced on the basis that stable operation of the wind turbine generator is guaranteed, the blade clearance is prevented from being reduced, and therefore, normal operation of the wind turbine generator is kept, unnecessary design cost and shutdown electric quantity loss are reduced, the accuracy of control is guaranteed, and misoperation is reduced.

Description

technical field [0001] The invention relates to a method and system for dynamic control of blade clearance of a wind turbine, and belongs to the technical field of blade clearance control of a wind turbine. Background technique [0002] Blade clearance actually refers to the minimum clearance between the blade tip and the surface of the tower (Blade Tip to Tower Clearance). The GL certification specification requires that the minimum clearance should not be less than 30% of the undeformed state of the blade during the operation of the unit. In the operating condition of the whole machine, the minimum value of blade clearance usually appears near the rated value, but when the pitch angle has not been adjusted, the thrust force on the blade is the largest, and the bending deformation of the blade along the axial direction of the unit is the largest. There is also a large displacement of the nacelle and a forward nod, which in turn minimizes the distance between the tip of the ...

AI Technical Summary

Problems solved by technology

Once the high-speed rotating blade tip collides with the wind turbine tower, the wind turbine will face the risk of machine destruction and tower collapse, causing huge property losses and even endangering life safety.

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