Wind Turbine Rotor Blade Heating Strip Lightning Conduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solutions for preventing ice formation on wind turbine rotor blades, such as hot air blowing and carbon heating mats, are inadequate for operation in sub-zero regions, leading to reduced energy production and potential damage to the turbines.
Innovation Solution
A rotor blade design incorporating an electric heating arrangement with flexible heating strips that cover a significant portion of the blade's length, integrated with a lightning protection system to conduct electrical energy safely to the ground, providing both deicing functionality and lightning protection without reducing the turbine's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hot air blowing arrangements are used to prevent ice formation, then ice adhesion is reduced, but device complexity and energy consumption increase
Solution Approach 1:
The patent extracts the heating function from a complex hot air blowing system and implements it through simple electric heating strips embedded in the rotor blade. This removes the need for complex air delivery mechanisms while maintaining the de-icing function.
Solution Approach 2:
The patent replaces the mechanical hot air blowing system with an electric heating system. Instead of using mechanical means to deliver hot air, electric heating strips directly generate heat at the ice-prone locations on the rotor blade.
2Object-affected harmful factors
If carbon heating mats are applied to the rotor blade skin, then ice adhesion is reduced, but manufacturing precision and structural integrity requirements increase
Solution Approach 1:
The heating strips are nested within grooves or channels in the rotor blade structure, or embedded within the blade skin. This integration protects the heating elements while maintaining aerodynamic surface integrity and simplifying installation.
Solution Approach 2:
The heating strips are designed as flexible elements that can conform to the rotor blade surface geometry. This flexibility allows easy installation and adaptation to curved surfaces without requiring high manufacturing precision.
3Object-affected harmful factors
If heating arrangements are integrated into the rotor blade, then ice adhesion is reduced, but the rotor blade becomes more vulnerable to lightning strikes
Solution Approach 1:
The patent merges the heating function and lightning protection function into a single integrated system. The same electrically conductive heating strips that provide de-icing also serve as lightning conductors, guiding lightning strikes safely to ground without requiring separate protection systems.
Solution Approach 2:
The heating strips are designed to perform multiple functions: de-icing during normal operation and lightning conduction during storm conditions. This multi-functionality eliminates the need for separate components and simplifies the overall system.
4Reliability
If heating strips with high electrical conductivity are used, then lightning protection is improved, but energy efficiency for heating decreases
Solution Approach 1:
The patent optimizes the electrical resistance parameter of the heating strips to achieve a balance between heating efficiency and lightning protection. The resistance is tuned so that the strips generate sufficient heat for de-icing while also providing adequate conductivity for lightning dissipation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces ice adhesion on rotor blades and safely manages lightning strikes, enhancing operational efficiency and extending the lifespan of wind turbines by integrating heating and grounding functions into a single, cost-effective design.
Implementation Method 1
a heating strip (202) configured for being capable to reduce an adhesive bonding between ice and a blade skin (140) by electrically heating a respective surface of the blade skin (140)
Implementation Method 2
The lightning arrangement comprises a grounding device (164) which is configured for conducting electrical energy of a lightning strike into a grounding arrangement (400) of the wind turbine (10)
Data Source
AI summary
A rotor blade for a wind turbine includes a blade skin forming a suction surface and a pressure surface. An electric heating arrangement has a heating strip with a width-thickness relation configured to reduce bonding between ice and the blade skin by electrically heating a respective surface of the blade skin and to conduct lightning-strike currents of at least 10 kA. An energy transfer arrangement supplies electrical energy to the heating arrangement. An integrated lightning arrangement includes a lightning receptor mounted to a tip section of the blade and electrically connected to the heating strip such that the lightning strike is conducted from the lightning receptor to the heating strip. A grounding device is connected to a grounding arrangement of the wind turbine such that electrical energy of the lightning strike is conducted from the heating strip through the grounding device and into the grounding arrangement.