Variable-speed variable-pitch wind turbine generator unit gust control method

Abstract

The invention provides a variable-speed variable-pitch wind turbine generator unit gust control method. The method comprises the following steps of (A) detecting whether the rotation speed omega of a wind turbine generator unit is greater than a rated rotation speed omega <rate> of the wind turbine generator unit or not; (B) calculating whether the acceleration speed delta omega / delta t of the wind turbine generator unit is greater than an acceleration speed set threshold value or not; (C) directly setting the variable-pitch angle to be 90 degrees if the wind turbine generator unit meets both the conditions A and B, conducting open-loop control and increasing the variable-pitch rate to the set threshold value; (D) controlling the torque output to be an original torque value during variable-pitch open-loop control; and (E) after the feathering set time T, switching variable-pitch control to conventional closed-loop control if the wind turbine generator unit does not meet the conditions A and B, and continuing feathering of a variable-pitch system if the wind turbine generator unit meets both the conditions A and B. The variable-speed variable-pitch wind turbine generator unit gust control method provided by the invention is good in stability and high safety performance.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a gust control method for variable-speed and variable-pitch wind turbines. Background technique [0002] With the development of low wind speed and ultra-low wind speed wind turbines, the diameter of wind turbines has been increasing. Due to the huge inertia of the wind rotor, the speed of the wind rotor usually changes 1 to 2 seconds after the gust occurs, and the lagging system is likely to cause speeding. Another factor that causes the turbine to overspeed is that due to the nonlinear characteristics of blade aerodynamics, a single controller or a single-gain controller can no longer meet the control performance requirements. The usual practice is to design the gain adjustment according to the pitch angle or wind speed The larger the pitch angle or the wind speed, the smaller the gain. This avoids the long adjustment time of the pitch angle, but in the case of g...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of poor stability and low safety of existing variable-speed and variable-pitch wind turbine gust control methods, the present invention provides a variable-speed variable-pitch wind turbine gust control method with good stability and high safety

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