Equivalent Wind Speed Determination for Wind Turbines
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Solution Overview
Problem
Current methods for determining wind speed in wind power installations are inaccurate, especially during power curtailment, leading to inaccuracies in calculating producible power, which is crucial for remuneration and grid balancing.
Innovation Solution
The method involves determining an equivalent wind speed by using state observers to account for internal power, rotational speed, and blade angle, incorporating generator losses and tip-speed ratio, to accurately calculate the power that could be produced without throttling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a nacelle anemometer is used to measure wind speed, then wind speed measurement is achieved, but measurement precision deteriorates due to inaccuracy significant depending on wind speed and gustiness
Solution Approach 1:
The patent replaces the mechanical nacelle anemometer measurement system with a computational model that calculates equivalent wind speed based on electrical power measurements, rotor speed, and aerodynamic equations. This substitution eliminates the physical limitations of mechanical anemometers and provides more accurate wind speed determination.
Solution Approach 2:
The patent introduces an intermediate computational approach that uses easily measurable quantities (electrical power, rotor speed) as mediators to derive wind speed information. Instead of directly measuring wind speed with an imperfect sensor, the system uses these intermediate variables to calculate the equivalent wind speed through established aerodynamic relationships.
2Ease of manufacture
If the last fed power value is used as basis for remuneration calculation, then calculation simplicity is achieved, but manufacturing precision deteriorates due to inaccuracy especially during curtailment
Solution Approach 1:
The patent changes the fundamental parameters used for remuneration calculation from simple historical power values to a comprehensive set of parameters including electrical power, rotor speed, blade angles, and aerodynamic coefficients. This parameter transformation enables accurate calculation of equivalent wind speed and producible power while maintaining computational feasibility through structured algorithms.
3Measurement precision
If empirical correction factors are used to compensate wind speed deviations, then some systematic shortcomings are compensated, but measurement precision cannot be significantly improved due to restricted extent of correction
Solution Approach 1:
The patent replaces empirical correction factors with a physics-based computational model that directly calculates equivalent wind speed from fundamental aerodynamic equations. This substitution eliminates the need for empirical adjustments and provides a more accurate, first-principles-based determination of wind speed and producible power.
Data Source
AI summary
A method for determining an equivalent wind speed of a rotor blade plane of a wind power installation is provided. The wind power installation has a rotor with rotor blades that have adjustable blade angle. The method includes determining an electric internal power available in the wind power installation depending on a captured electric power and a captured rotational speed of the rotor. The method includes determining the equivalent wind speed depending on the determined available internal power and the captured rotational speed.