Wind Turbine Rotor Blade Moment Control via Sensor Extraction
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Solution Overview
Problem
Current methods for measuring bending moments on wind turbine rotor blades are complex and require multiple sensors, leading to increased effort and potential measurement errors, especially when reducing out-of-plane moment determination.
Innovation Solution
A device and method that use a reduced number of sensors to detect impact torque and rotational position, allowing for the calculation of in-plane and out-of-plane moments by transforming sensor data, enabling precise control of wind energy installations with simplified architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to measure bending moments on rotor blades, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and measures only the out-of-plane moment component using a single sensor, while the in-plane moment is calculated through transformation of position data and sensor signals. This selective measurement approach reduces the number of sensors needed while maintaining overall measurement precision through mathematical decomposition of the moment vector into manageable components.
Solution Approach 2:
The patent introduces position detection devices and evaluation devices as intermediaries that capture rotor blade position data and transform it into in-plane moment information. These intermediary measurements, combined with out-of-plane sensor data, enable complete bending moment assessment without requiring multiple direct moment sensors.
2Reliability
If multiple sensors are distributed around the rotor blade circumference, then measurement reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the essential out-of-plane moment information using a single sensor pair, eliminating the need for multiple sensor distributions around the blade circumference. This reduction maintains measurement reliability for control purposes while significantly improving ease of installation and maintenance.
3Device complexity
If a reduced number of sensors is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent performs preliminary measurement of position data and in-plane moment components before combining them with out-of-plane sensor data in the evaluation device. This preliminary action enables the system to reconstruct complete bending moment information from reduced sensor inputs, maintaining precision while reducing complexity.
Solution Approach 2:
The patent transforms position parameters and sensor signal parameters into moment components through mathematical relationships. By changing the parameter representation from direct moment measurements to position and force components, the system achieves equivalent measurement precision with fewer sensors.
4Measurement precision
If multiple sensor pairs are used to determine out-of-plane moments, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts out-of-plane moment measurement to a single sensor pair with standardized alignment requirements, eliminating the need for multiple sensor pairs with complex relative positioning. This approach maintains measurement precision while significantly reducing manufacturing and alignment precision requirements.
Data Source
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Figure 3~5
AI summary
The present invention relates to a device (10) and a method for setting the pitch angle (θ) of a rotor blade (3) for a wind turbine (1), as well as a device (11) and a method for controlling a wind turbine (1). The rotor blade (3) is connected to a rotor axis (R) of a rotor (2) by means of a rotor hub (4). A position detection device (20) is configured to detect a rotational position of the rotor blade (3) with respect to the rotor axis (R) and to output position data (P) that characterize a value of the rotational position.Furthermore, a sensor device (40) is provided, which is arranged on and/or in the rotor blade (3) and is configured to determine a striking moment (MfB) acting on the rotor blade (3) perpendicular to a rotor blade longitudinal axis and to output sensor data (S) that characterize a value of the determined striking moment (MfB), and an evaluation device (50) is configured to determine, using the position data (P), a value of an in-plane moment (MzB) of the rotor blade (3) and, from the determined in-plane moment (MzB) and the sensor data (S), taking into account a direction of action of the determined striking moment (MfB) relative to a chord area (3a) of the rotor blade (3), a value of an out-of-plane moment (MyB) of the rotor blade (3) and to output the determined values.A blade pitch control device (60) is preferably configured to adjust the pitch angle (θ) of the rotor blade (3) based on the determined value of the in-plane moment (MzB) and/or the determined value of the out-of-plane moment (MyB).