Wind Turbine Blade Deflection Monitoring via Modal Profile
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Solution Overview
Problem
Existing wind turbine blade deflection monitoring systems face challenges in ensuring continuous, reliable, and accurate operation, particularly in preventing tower strikes due to extreme blade deflection, which can cause damage or failure.
Innovation Solution
A method using a known modal profile of the wind turbine blade to calculate a blade deflection profile based on a single distance measurement between the root and tip locations, employing wireless communication links and triangulation/trilateration for accurate distance measurement and system calibration, allowing for real-time adjustment of wind turbine operation to prevent tower strikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If triangulation or trilateration systems are used to monitor blade tip position from multiple locations, then the monitoring coverage is improved, but the system complexity and reliability are worsened due to requiring multiple monitoring points and subsequent calculations
Solution Approach 1:
The invention extracts the essential measurement requirement from complex multi-point triangulation systems and reduces it to a single distance measurement between root and tip locations. By taking out only the critical measurement (root-to-tip distance) and combining it with modal profile data, the system achieves accurate blade deflection monitoring without the complexity of multiple monitoring points and coordinate calculations.
Solution Approach 2:
The invention uses a copied or simplified representation of the blade's structural characteristics through modal profiles. Instead of directly measuring complex three-dimensional tip positions from multiple angles, the system copies the essential vibrational mode shapes and combines them with a single distance measurement to reconstruct the blade deflection state, significantly reducing system complexity.
2Measurement precision
If multiple monitoring locations are used for triangulation, then measurement coverage is improved, but the reliability and continuous operation are worsened due to potential failures at any monitoring point
Solution Approach 1:
The invention extracts the critical measurement from a multi-point system and isolates it to a single essential measurement between root and tip locations. This extraction reduces the number of potential failure points from multiple monitoring locations to just one measurement link, thereby improving system reliability while maintaining measurement accuracy through the use of modal profile data.
Solution Approach 2:
The invention applies beforehand cushioning by using pre-characterized modal profiles of the blade that account for various vibration modes and operating conditions. These pre-stored modal characteristics serve as a backup or cushion against measurement uncertainties, allowing the system to maintain reliable operation even with a single measurement point by compensating through mathematical modeling of expected blade behavior.
3Object-affected harmful factors
If pre-bent blades with increased tip-to-tower clearance are used, then tower strike risk is reduced, but constructional challenges and costs are increased
Solution Approach 1:
The invention implements feedback by continuously monitoring the actual blade deflection using the single distance measurement combined with modal profiles. This real-time feedback allows the control system to detect when the blade is approaching dangerous deflection levels and take corrective action (such as adjusting pitch or yaw), dynamically preventing tower strikes without requiring permanent structural modifications like pre-bending or increased tilt angles.
Solution Approach 2:
The invention applies dynamics by using the blade's natural vibrational modes and modal profiles to understand and predict blade behavior under various loading conditions. By leveraging the dynamic characteristics of the blade rather than static geometric modifications, the system can anticipate dangerous deflections and respond appropriately, avoiding the need for fixed structural changes that increase manufacturing complexity.
4Object-affected harmful factors
If increased tilt angle or distance from tower is used, then tower strike prevention is improved, but cost and constructional challenges are worsened
Solution Approach 1:
The invention uses real-time feedback from the single distance measurement and modal profile analysis to dynamically adjust turbine operation and prevent tower strikes. This feedback-based approach eliminates the need for increased structural clearance or tilt angles, thereby avoiding the associated constructional challenges and costs while maintaining effective tower strike prevention through active control.
Data Source
AI summary
A method for the determination of the deflection of a wind turbine blade is provided. A distance between at least one root location towards a root end of the wind turbine blade and at least one tip location towards a tip end of the wind turbine blade is measured. A blade deflection profile is then calculated based on the measured distance between the root and tip locations and a known modal profile of the wind turbine blade.