Wind Turbine Blade Icing Mitigation via Passive Control
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Solution Overview
Problem
Icing on wind turbine blades affects their aerodynamic profile, efficiency, and safety, causing vibrations and potential damage, and conventional methods are inadequate to address these issues effectively.
Innovation Solution
A method that involves sensing icing hazards using sensors, adjusting blade pitch to a stalled position, and yawing the rotor perpendicular to the wind direction to reduce icing, while also positioning the blades to receive sunlight for deicing, leveraging existing control systems without significant structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional deicing methods are used, then icing protection is provided, but device complexity and cost increase significantly
Solution Approach 1:
The wind turbine utilizes its own existing control systems (pitch control and yaw control) to perform deicing functions. The blade pitch is adjusted to a stalled position and the rotor is yawed perpendicular to wind direction, making the system self-servicing without requiring external deicing equipment.
Solution Approach 2:
The existing pitch and yaw control systems, originally designed for power optimization, are made multi-functional by enabling them to also perform deicing operations. This allows one system to serve multiple purposes: power generation optimization and icing hazard mitigation.
2Reliability
If active deicing systems are installed, then deicing effectiveness improves, but manufacturing cost and ease of manufacture deteriorate
Solution Approach 1:
The system uses already-installed control mechanisms (pitch actuators and yaw drive) to accomplish deicing, eliminating the need for separate active deicing systems such as heating elements, compressed air systems, or mechanical ice removal devices.
Solution Approach 2:
The deicing function is extracted from the concept of requiring dedicated deicing equipment and is instead achieved through reconfiguring the operational parameters of existing control systems, removing the need for additional manufacturing complexity.
3Object-affected harmful factors
If blade pitch is adjusted to reduce icing, then icing hazard is reduced, but power generation efficiency decreases
Solution Approach 1:
The pitch and yaw adjustments are applied periodically or temporarily only when icing hazards are detected, allowing the system to maintain normal power-generating operation during non-icing conditions while providing protective action when needed.
Solution Approach 2:
The system applies pitch and yaw adjustments preventively when icing conditions are anticipated or detected, addressing the icing hazard before it can significantly impact blade performance, thereby minimizing the duration and intensity of power loss.
4Object-affected harmful factors
If rotor is yawed perpendicular to wind direction, then icing is reduced, but energy capture efficiency deteriorates
Solution Approach 1:
The perpendicular yaw positioning is applied temporarily only during icing hazard conditions rather than continuously, allowing the rotor to return to its optimal power-generating orientation when icing threats are absent.
Solution Approach 2:
The yaw adjustment is applied preemptively when icing conditions are detected, positioning the rotor to minimize ice accumulation before it can adversely affect blade aerodynamics and power generation.
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
This approach effectively reduces icing, accelerates deicing, and minimizes downtime by using existing control systems to manage blade pitch and position, thereby enhancing operational safety and efficiency.
Implementation Method 1
positioning the blade to receive sunlight for deicing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method of operating a wind turbine (2) having rotor with at least one blade (10), includes sensing (302) an icing hazard for the blade (10); and moving the at least one blade (10) into a position to reduce the icing hazard.