Wind turbine generator set limit load control method under blade clamping condition

Abstract

The invention relates to the technical field of wind power generation, and discloses a wind turbine generator set limit load control method under a blade clamping condition. A cabin displacement sensor signal is introduced into set variable-pitch process control, and on the basis of the vibration change of cabin displacement, variable-rate adjustment is performed on the variable-pitch rates of the other two blades, the vibration dynamic response of the set can be effectively restrained, and then the limit load can be reduced; the torque of a generator is controlled while the limit load under the clamping working condition is reduced, according to a traditional control method, when the set triggers a shutdown fault, the torque of the generator directly drops to 0 within a certain time, but according to the method, the torque of the generator is controlled, the torque is increased firstly, and the influence of thrust reduction on structural response is restrained, then the torque of the generator is gradually reduced, the effect of restraining vibration of the set or a tower is achieved, and the limit load is reduced; according to the method, variable-rate variable-pitch control and variable-torque control under the blade clamping condition are combined, so that the limit load under the working condition is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for controlling the limit load of a wind turbine under the condition of blade jamming. Background technique [0002] A wind turbine is a complex system involving many disciplines. The main sources of wind turbine loads are aerodynamic loads, gravity loads, and inertial loads, which are important factors affecting the cost and efficiency of the entire wind power generation system. In addition to being related to the safety of the unit, the load directly determines the manufacturing cost of the unit. Reducing the load of the unit is an important means to improve the power generation performance of the unit, improve quality and efficiency, and reduce manufacturing costs. [0003] At present, the product design of wind turbines is mainly based on GL and IEC61400 standards to calculate and analyze the limit and fatigue loads of the whole machine under various c...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a wind turbine limit load control method under the condition of blade jamming, which solves the aerodynamic imbalance of the three blades caused by the blade jamming, which leads to extreme loads in the transmission chain system and yaw system. question

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