Blade vibration damping control method and system of wind generating set

Abstract

The invention relates to a blade vibration damping control method and system of a wind generating set. The method includes the steps of presetting a blade vibration acceleration reference value, acquiring a blade vibration acceleration measured value through collection, comparing the measured value with the reference value, and controlling a blade to achieve vibration damping according to the comparison result. The system comprises a blade vibration signal collecting system used for acquiring the vibration acceleration measured value of the blade through collection, a vibration damping control execution system used for controlling the blade to achieve vibration damping, and a vibration damping control calculating system used for presetting the vibration acceleration reference value of the blade, receiving the blade vibration acceleration measured value which is output by the blade vibration signal collecting system, and controlling the vibration damping control execution system according to the comparison result of the measured value and the reference value. The vibration damping control system is additionally arranged on the blade, the damp of the blade vibration damping control system can be adjusted in times of wind speed change, hence, vibration in the axial direction of the blade can be reduced, stable operation of the blade is achieved, and it is of great significance to prolonging the service life of the wind generating set.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for controlling the vibration of a blade of a wind power generating set. Background technique [0002] The potential for wind energy development in my country is huge, especially in many places along the coast where wind energy resources are abundant and have good development prospects. By building wind power generators in these locations, these energies can be fully utilized and huge economic value can be created. [0003] The wind turbine control system is the core of the entire generator set, which directly affects the performance of the entire power generation system. Because the blades of the fan unit are subjected to a huge load in the axial direction due to the gust thrust, a small change in the wind speed will cause a large change in the axial force, causing the blades to vibrate in the axial direction, so a well-designed control system w...

AI Technical Summary

Problems solved by technology

The existing wind turbine control system sets the pitch mechanism to change the angle of the blades when the wind speed is too high to change the air inflow angle at the blades and reduce the axial load on the blades, but the torque required for the pitch action is huge At the same time, the blade itself has a large moment of inertia, and the response time delay of the low-speed high-torque motor as the pitch actuator is relatively large, so it cannot perform the pitch change action in time, resulting in excessive vibration and high load in the axial direction of the blade. The range that the blades can withstand cannot be reached, which affects the performance and life of the blades and the entire unit, resulting in high maintenance costs for wind turbines

[0004] It can be seen that the above-mentioned existing wind power generating set control method and system obviously still have inconvenience and defects in design and use, and need to be further improved urgently.

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