A Control Method for Eliminating Blade Vibration

Abstract

The invention discloses a control method for eliminating blade vibration, which comprises the following steps: setting a standard value for the unit, collecting variable data, dynamically compensating voltage for a proportional solenoid valve, and controlling the actual opening of the proportional solenoid valve, and setting the standard value for the unit Set the threshold value of the proportional solenoid valve and the required pitch angle. The threshold value of the proportional solenoid valve is the proportional solenoid valve voltage U required by the unit. The difference between the required pitch angle and the actual pitch angle is converted into the displacement value of the actuator, which is calculated by the displacement value. Proportional solenoid valve voltage; the control method for eliminating blade jitter designed in the present invention does not change the pitch angle accuracy of the original control program, but adds feedback control to the pitch jitter, which is simple to control and has remarkable effects; the power generation mode of the unit The accuracy of the lower pitch angle is not affected, and the power generation capacity of the unit is not affected; the compensation voltage is introduced through the blade displacement sensor to eliminate blade vibration, and the control is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control method for eliminating blade shaking. Background technique [0002] The blades of wind turbines are the key part of capturing wind energy. The pitch of the blades is changed through the control system, and the aerodynamic characteristics of the blades are changed to achieve constant power operation of the unit under strong winds. In addition, the cost of blades is relatively high. As the low wind speed area requires longer and longer blades, the cost of blades will gradually increase. Because the blade is affected by the wind-carrying fluid, the stiffness of the blade itself is low, and it deforms under the action of wind load, which has significant fluid-solid coupling characteristics. Especially for long blades, it is easy to cause blade flutter under wind load excitation. Flutter is generally caused by the fact that the vibration frequency of the blad...

AI Technical Summary

Problems solved by technology

When the hydraulic cylinder is in motion, the blades are easy to vibrate due to the small rigidity and long length of the blades

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