An Intelligent Pitch System for Wind Turbine Flutter Suppression Based on Piezoelectric Feedback

Abstract

The invention discloses an intelligent pitch-changing system based on piezoelectric feedback for suppressing flapping flutter of a wind turbine. The wind turbine includes a hub and intelligent blades. Piezoelectric material, signal transmission and processing device, pitch control device, and pitch actuator device. When each intelligent blade generates blade tip waving displacement under the action of aerodynamic force, the piezoelectric material generates a voltage signal, and the signal transmission and processing device is used to receive The voltage signal is processed, and the processed voltage signal is transmitted to the pitch control device. The pitch control device is used to judge the voltage signal, and sends a control command to the pitch actuator according to the judgment result. The actuator controls the pitch angle of each intelligent blade. The invention reduces the hysteresis during blade vibration suppression, simplifies the implementation process of flapping displacement detection, and increases the sensitivity and accuracy of blade flapping displacement detection.

Description

technical field [0001] The invention belongs to the technical field of wind power generator control, and in particular relates to an intelligent pitch-changing system based on piezoelectric feedback for suppressing flapping flutter of a wind power machine. Background technique [0002] With the continuous consumption of traditional energy and the sharp decline in stock, the cost of using traditional fossil energy is increasing day by day, and the amount of memory will be exhausted in a limited time. In recent years, new energy technology has developed by leaps and bounds, especially in wind energy technology, the structural size of wind turbines and related technologies have made great progress. [0003] In the early days of the development of wind turbines, the shape of the blades was usually thick and the spanwise length was relatively short, which was relatively bulky and thick compared to the current blade shape. With the continuous development of wind energy utilizatio...

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Problems solved by technology

And as the structure and materials adopted by the blades are quite different from before, there are also aeroelastic problems: the blades are elastically deformed under the action of wind, and this elastic deformation also affects the fluid around them in turn - the wind is as such. fluid considerations

[0008] Traditional passive control and pitch control have their insurmountable defects. The control has hysteresis and inaccuracy: using sensor products on the blade to detect signals such as displacement or acceleration requires additional connection to an external power supply and related circuits need to be set on the blade. The implementation process is very complicated and costly, and the sensor layout method needs to be optimized. The detection process is extremely vulnerable to external interference and the process is not easy to implement

Setting sensor leads and information transmission on the surface of the blade is complicated, and it is also very easy to change the aerodynamic shape of the blade and affect the stability

The pitch motion of the traditional wind power system is based on the constant speed of maximum power acquisition or constant power operation, and less attention is paid to the suppression of blade vibration, a form of motion that is extremely easy to damage blades. Today's wind power The acquisition of wind power technology is no longer the main bottleneck in the development of wind power technology. Now the main problem of wind power technology is how to further reduce the cost of power generation, including prolonging the service life of wind turbines and realizing active protection and control of wind turbines at a lower cost, and how to operate in multiple Arrangement of wind power equipment under various climate and geographical conditions

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