Intelligent variable pitch system for inhibiting waving resonance of wind turbine based on SMA differential pressure feedback

Abstract

The invention discloses an intelligent variable pitch system for inhibiting the waving resonance of a wind turbine based on SMA differential pressure feedback. The wind turbine, a signal transmittingand processing device, a variable pitch control device and a variable pitch executing device are included; shape memory alloy SMA materials are laid on the upper layer and the lower layer of wind turbine blades, and the SMA materials located between the upper layer and the lower layer on the same blade are connected through a guide wire; when the wind turbine blades generate the waving displacement of the tip portions of the blades, the SMA material arranged between the upper layer and the lower layer generates differential pressure, and a voltage signal is output; the signal transmitting andprocessing device processes the voltage signal, the processed voltage signal is transmitted to the variable pitch control device; the variable pitch control device judges the processed voltage signaland sends a control instruction to the variable pitch control device according to the judging result; and control over the variable pitch angle of the wind turbine blades is achieved. By means of thesystem, hysteresis of resonance inhibiting of the wind turbine blades can be reduced, the conducting process of waving resonance detection is simplified, and the sensitivity and the accuracy of wavingresonance detection are improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generator control, and in particular relates to an intelligent pitch control system based on SMA differential pressure feedback to suppress wind power machine flapping resonance. Background technique [0002] In recent years, new energy technology has been greatly developed, especially wind energy technology and wind energy capture machinery. The wind turbine may resonate under the action of external force. Once the wind turbine resonates, it will cause great damage to the wind turbine in a very short time. The general cause of resonance is: under the excitation of constant wind source force, when the natural frequency of the wind turbine is close to the natural frequency of the external force, the amplitude increases suddenly. [0003] Under such conditions, aerodynamic force is generally considered as the main external force, because the aerodynamic load is the main source of load borne by t...

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Problems solved by technology

[0003] Under such conditions, aerodynamic force is generally considered as the main external force, because the aerodynamic load is the main source of load borne by the blade, and its direction and magnitude are easy to change, so it is difficult to analyze qualitatively, and it is easy to cause the frequency of external load and the excitation frequency of the blade Or when the natural frequency of a certain order is close, once this happens, the blade will resonate, and the amplitude of the blade will increase sharply during the resonance, which will easily cause damage to the blade

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