In Situ Wind Turbine Blade Extension for Low-Downtime Repowering
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Solution Overview
Problem
Wind turbine blade refurbishment and repowering face challenges due to high costs and complexities, particularly in upgrading existing blades to increase energy capture without significant weight increase, which affects safety and maintenance, and existing methods either require extensive downtime or offer modest power gains.
Innovation Solution
A method involving precise milling and alignment techniques using rail-guided milling tools and alignment frames to extend wind turbine blades in situ, allowing for a lightweight, aerodynamically optimized tip extension without heavy lifting equipment, ensuring precise alignment and bonding to maintain structural integrity and aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional blade replacement is performed, then power production increases significantly, but installation cost and downtime increase prohibitively
Solution Approach 1:
The blade extension is divided into separate modular sections that can be attached incrementally to the existing blade. This segmentation allows the extension to be installed in manageable segments rather than requiring complete blade replacement, reducing downtime and installation complexity while achieving the power production increase from longer blades.
Solution Approach 2:
The extension blade is designed to nest onto the existing blade structure, with the new extension section fitting over or integrating with the original blade. This nested configuration allows the extension to be attached without removing the entire blade assembly, significantly reducing downtime while achieving increased power production from the extended rotor diameter.
2Power
If traditional blade replacement is performed, then power production increases significantly, but installation cost increases prohibitively
Solution Approach 1:
The extension is provided as a separate modular component that can be manufactured independently and attached to the existing blade. This segmentation eliminates the need to manufacture and install entire new blade assemblies, reducing material costs, manufacturing complexity, and installation expenses while achieving the power increase from extended blade length.
Solution Approach 2:
The extension design serves multiple functions: it extends the blade length to increase power production, provides its own support structure to minimize additional load on the turbine, and includes integrated bonding surfaces for direct attachment. This multi-functionality reduces the need for additional components and installation steps, lowering overall installation cost.
3Power
If extension blade is attached to increase power production, then blade weight increases, but this reduces safety margins and increases component wear
Solution Approach 1:
The extension blade is constructed with locally optimized material distribution, using composite materials and structural configurations that provide necessary strength and stiffness only where required for aerodynamic performance. This localized quality approach minimizes overall weight while achieving the power production increase from extended blade length.
Solution Approach 2:
The extension blade utilizes composite materials that provide high strength-to-weight ratio, allowing the blade to be extended while minimizing additional weight. The composite construction enables the extension to achieve necessary structural performance with minimal mass, preserving safety margins and reducing wear on turbine components while increasing power production capability.
4Power
If extension blade is attached to increase power production, then structural limitations are reached, but this limits the size and therefore the amount of increase in power production
Solution Approach 1:
The extension blade incorporates an internal support structure that acts as a counterbalancing framework, distributing loads away from the bonding interface and the existing blade root. This anti-weight support structure enables greater extension lengths by compensating for the additional leverage effects, allowing increased power production without exceeding structural limitations.
Solution Approach 2:
The extension blade employs curved and aerodynamic cross-sectional shapes that optimize structural efficiency and load distribution. The curved spar caps and aerodynamic profile reduce stress concentrations and improve load paths, enabling longer extension lengths while maintaining structural integrity and avoiding the structural limitations that would constrain power production increases.
Data Source
AI summary
A method and apparatus for the refurbishment and repowering of wind turbines through the extension of existing installed blades so that they can catch more wind energy and therefore enable an increase in the overall average power output of the wind turbine.