Wind turbine generator blade clearance control method based on load detection

Abstract

The invention provides a wind turbine generator blade clearance control method based on load detection, and relates to the field of wind turbine generator regulation and control. The wind turbine generator blade clearance control method comprises the steps that detection points of key parts of a wind turbine generator structure are selected, and load detection is carried out on the key parts; the load of the detected key parts is converted into the load in the pitching direction of a cabin under a static hub coordinate system according to the acquired yawing azimuth angles of a wind wheel and the cabin; a cabin pitching load negative threshold value is obtained through wind turbine generator simulation software according to design specifications, and a variable pitch protection angle is determined; and loads of the key parts such as a blade root, a main shaft, a tower top and a tower bottom of a wind turbine generator are used for identifying a negative pitching load borne by the wind wheel, and the purpose of increasing blade clearance is achieved along with the specific operating condition characteristics of negative wind shearing in combination with a targeted pitch angle control method.

Description

technical field [0001] The present disclosure relates to the field of regulation and control of wind turbines, and in particular to a method for controlling blade clearance of wind turbines based on load detection. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the development of the wind power industry, in order to increase the annual power generation and economic benefits of wind turbines, wind turbines are developing in the direction of longer blades and higher towers. At the same time, in order to meet the grid parity of wind power, new requirements are put forward on the unit kilowatt cost of wind turbines. The cost of blades accounts for about 30% of the cost of the whole machine. In the design process of high-power long-blade wind turbines, how to effectively control the design weight of blades is a key An important factor ...

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Problems solved by technology

[0005] The inventor found that the control method of the wind turbine control system for the blade clearance is to increase the pitch angle of the blades, but because it cannot accurately identify the negative unbalanced load on the wind rotor and the occurrence of negative wind shear operating conditions, it requires The method of increasing blade pitch angle is adopted for all working conditions to achieve the purpose of increasing blade clearance

Increasing the pitch angle under all working conditions will inevitably lead to a decrease in the power generation performance of the wind turbine, which will have an adverse impact on the level of power generation revenue of the wind turbine. For the wind rotor to bear negative unbalanced loads, and with the specific operation of negative wind shear Due to the characteristics of working conditions, there is currently no targeted blade clearance control method that can avoid the loss of power generation caused by existing control methods

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