Offshore wind turbine as well as blade damage preventing device and method

Abstract

The invention relates to an offshore wind turbine as well as a blade damage preventing device and method. Surface pressure on blades can be sensed by pressure sensors. When the blades are hit by falling snow or raindrops, the surface pressure on the blades is increased until preset conditions are met, and thus a trigger signal is sent out. Further, a controller sends out a vibration signal, vibrators arranged in the blades produce vibration at the vibration frequency. The falling snow and the raindrops which hit the blades can be thrown off and can be prevented from being attached to surfaces of the blades through vibration and high-speed rotation of the blades. The falling snow and super-cooled water drops are major causes for icing of the surfaces of the blades. Besides, vibration produced by hitting of the raindrops can be offset by vibration of the blades, so that the internal stress is prevented from being accumulated in the blades. Thus, with the blade damage preventing device and method, icing and the internal stress can be effectively prevented.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to an offshore wind power generator, a blade damage prevention device and a method. Background technique [0002] Because they are generally installed in places with harsh environments such as high mountains and seas, the blades of offshore wind turbines are prone to freezing. After icing occurs, the aerodynamic characteristics of the blade surface will be destroyed, which will affect the efficiency and safe operation of the wind turbine. In addition, when high-speed continuous water droplets hit the surface of the blade, a large internal stress will be generated inside the blade. With the accumulation of internal stress, it will gradually develop into macroscopic defects (trachoma, groove-like defects, etc.), which seriously endanger the use of the blade. efficiency and longevity. Therefore, in order to ensure normal operation, it is necessary to eliminate the icing on the surf...

AI Technical Summary

Problems solved by technology

[0005] However, the method of high elastic coating can only delay the corrosion time of the blade, and cannot fundamentally eliminate the internal stress of the blade

Moreover, the existing three deicing methods all remove the ice after the ice appears. Due to the strong adhesion of the ice, it is difficult to achieve the ideal ice removal effect.

Therefore, when ice coating or internal stress occurs on the blade, the existing methods are not very effective in eliminating it.

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