Blade Stress Wind Sensing for Accurate Turbine Yaw Control
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Solution Overview
Problem
Existing wind power generation devices struggle to accurately determine the wind direction and speed on the blades due to the nacelle wind direction detecting device being positioned behind the blades, leading to potential inaccuracies in controlling the rotational angle of the nacelle.
Innovation Solution
Implementing a blade wind detecting device with stress sensors and a transmitting unit on each blade to wirelessly transmit wind direction and speed data to a blade control device, allowing for precise determination of wind conditions and controlling the pitch and yaw angles of the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the nacelle wind direction detecting device is positioned behind the blades, then the device structure is simplified, but the measurement precision of wind direction on the blades deteriorates
Solution Approach 1:
The wind detection function is segmented from the nacelle and distributed to individual blades. Each blade is equipped with its own wind detection device that directly measures wind conditions at its location, eliminating the need for the nacelle to be positioned behind all blades while achieving accurate local measurement.
Solution Approach 2:
The patent introduces stress sensors as intermediary devices that indirectly measure wind direction and speed by detecting mechanical stress on the blade structure. This allows wind measurement without requiring direct physical exposure of detection devices to wind, solving the positioning problem.
2Ease of operation
If the nacelle wind direction detecting device is positioned behind the blades, then the nacelle can be mounted on the tower, but the reliability of wind direction data for control deteriorates
Solution Approach 1:
The wind detection function is segmented from the nacelle and distributed to individual blades. Each blade is equipped with its own wind detection device that directly measures wind conditions at its location, eliminating the need for the nacelle to be positioned behind all blades while achieving accurate local measurement.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring wind conditions on each blade and immediately using this data for pitch and yaw control adjustments. This ensures reliable and responsive control based on actual wind conditions.
3Measurement precision
If stress sensors are provided on the blades, then the measurement precision of wind conditions on blades is improved, but the device complexity increases
Solution Approach 1:
The stress sensors on each blade serve multiple functions: they detect wind direction, wind speed, and blade structural stress simultaneously. This multi-functionality reduces the need for separate dedicated sensors for each parameter, thereby limiting the increase in device complexity.
Solution Approach 2:
The blade structure itself serves as the detection medium. The natural mechanical response of the blade to wind loading provides the measurement signal, eliminating the need for complex external measurement systems while achieving precise wind condition detection.
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
Accurately determines wind conditions on the blades, enabling improved power generation efficiency by ensuring the blades face the optimal direction and speed, thereby enhancing power output and reducing the load on storage capacity.
Implementation Method 1
at least one stress sensor provided on the at least one blade
Data Source
AI summary
A wind power generation device control system includes: a blade wind detecting device for detecting at least one of a wind direction or a wind speed on at least one blade of a wind power generation device; and a blade control device for controlling at least one of (i) a pitch angle of the at least one blade or (ii) a yaw angle of the wind power generation device, based on at least one of the wind direction or the wind speed detected by the blade wind detecting device.