Wind Turbine Rotor Speed Control for Site Turbulence Classes
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Solution Overview
Problem
Existing wind turbines operate with standardized parameters that do not account for site-specific environmental conditions, leading to inefficient energy production and increased loads due to varying turbulence intensities and air densities.
Innovation Solution
Adapt the nominal rotor speed and vortex generator configuration based on site-specific turbulence classes and air density to optimize load management and energy production, using adjustable blade angles and vortex generators to mitigate the effects of turbulence and air density variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standardized operating parameters are used for all wind turbines regardless of location, then device complexity is reduced and ease of operation is improved, but energy yield is reduced and loads increase due to not accounting for site-specific turbulence and air density conditions
Solution Approach 1:
The patent applies parameter changes by adjusting the nominal rotor speed based on the turbulence class of the installation site. Wind turbines are operated with different nominal rotor speeds corresponding to different turbulence classes (IA, IB, II, III, IV), allowing optimization of energy yield for each site-specific condition while maintaining standardized blade designs and control systems.
2Reliability
If standardized nominal rotor speed is used across all turbulence classes, then ease of operation is improved and control is simplified, but loads on the turbine increase in high turbulence environments
Solution Approach 1:
The patent implements parameter changes by establishing different nominal rotor speeds for different turbulence classes. This allows the turbine to operate with optimized speeds that reduce loads in high turbulence environments while maintaining simple control mechanisms through standardized pitch angle characteristics and generator control for each turbulence class.
3Productivity
If higher nominal rotor speed is used to increase energy capture in low-wind environments, then energy yield is improved, but loads on the turbine structure increase
Solution Approach 1:
The patent resolves this contradiction by changing the nominal rotor speed parameter according to turbulence class. In high turbulence classes (III, IV), lower nominal rotor speeds are used to reduce loads while maintaining adequate energy capture. The pitch angle characteristics are also adjusted for each turbulence class to optimize the balance between energy capture and load reduction.
4Productivity
If site-specific operational parameters are implemented for different turbulence classes, then energy yield is optimized and loads are reduced, but device complexity increases
Solution Approach 1:
The patent manages device complexity by implementing parameter changes in a structured manner. Only the nominal rotor speed and pitch angle characteristics are varied across different turbulence classes, while maintaining standardized blade designs, control systems, and operating procedures. This selective parameter adaptation optimizes energy yield without requiring complete reconfiguration of the turbine system.
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
Enhances energy yield and reduces loads by dynamically adjusting operational parameters to match local conditions, particularly in low-wind environments, ensuring efficient and robust wind turbine performance across different turbulence classes.
Implementation Method 1
several vortex generators (118) are arranged on the rotor blades (108) between the rotor blade root (114) and the rotor blade tip (116)
Data Source
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AI summary
The invention relates to a method for operating a wind power installation (100) for generating electrical power from wind, wherein the wind power installation (100) has an aerodynamic rotor (106) with rotor blades (108) which can be adjusted in their blade angle, and the rotor (106) is operated at an adjustable rotor rotational speed (nΑ, nB), characterized in that a turbulence class is determined at a location of the wind power installation (100) and the rotor rotational speed (nΑ, nB) is determined according to the determined turbulence class.