A wind turbine load shedding control method

Abstract

The invention relates to a wind generation set deloading control method. The method comprises the steps that whether a current feedback value of a variable pitch motor is larger than a set parameter value Ir or not is judged at first; if yes, a wind generation set runs in a semi-control mode, in other words, when the practical feedback current of the variable pitch motor is larger than the reference value Ir, the variable pitch motor is controlled to carry out output according to the reference value Ir, and meanwhile, double closed loop control is canceled; after continuous running is carried out for the set time T, whether the phenomenon that blades are nonsynchronous exists or not is judged; and when the angle difference of every two adjacent blades exceeds a set angular deviation, the blades are in the nonsynchronous state, a blade cooperation mechanism is executed, the blade with the largest angle is used as the reference, and the other two blades are controlled to keep the same angle as the blade. Due to the fact that the semi-control mode is added, when large turbulent flow appears, the problems that execution of a variable pitch system lags and the wind generation set is overspeed are solved. The variable pitch nonsynchronous phenomenon existing during operation in the semi-control mode is avoided through the blade cooperation mechanism.

Description

technical field [0001] The invention relates to the field of wind power generators, in particular to a load reduction control method for wind power generators. Background technique [0002] At present, the pitch control method of wind turbines is generally a double-closed-loop active control mode, that is, the wind turbine calculates the angle that the blade should reach according to parameters such as wind speed, wind turbine speed, and pitch motor speed, and then issues instructions to drive the pitch motor. Allow the blades to angle and run. [0003] This kind of control method is simple to control, but for the working conditions with rapid changes in wind speed and large turbulence, the control effect of this control method will lag behind the theoretical value, and it is easy to trigger faults such as overspeed. At the same time, for the working conditions with large turbulent flow, this control method only controls the variable of the blade angle, without considering ...

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Problems solved by technology

[0003] This control method is simple to control, but for the working conditions with rapid wind speed changes and large turbulence, the control effect of this control method will lag behind the theoretical value, and it is easy to trigger overspeed and other faults

At the same time, for the working conditions with large turbulent flow, this control method only controls the variable of the blade angle, without considering the influence of other parameters such as the instantaneously increased pitch motor current when the turbulent flow occurs, thus indirectly increasing the wind power generation capacity of the wind turbine. The operating load, the fatigue load of key components such as blades and bearings are also greatly increased, resulting in unstable operation of the wind turbine, and even greatly shortening the service life of the wind turbine

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