Wind Power Plant Output Loss Determination Using Characteristic Curves
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Solution Overview
Problem
Wind power plants face challenges in accurately determining energy output losses when operating at reduced power settings due to the lack of nearby wind measurement masts and distortion of anemometer measurements by the rotor, making it difficult to quantify and compensate for energy reductions as per network demands.
Innovation Solution
A method for operating wind power plants with adjustable rotor blades involves measuring predefinable operating parameters and applying them to stored characteristic curves to determine potential and actual energy outputs, using corrected anemometer measurements and multiple characteristic curves for different power reduction levels to calculate energy losses precisely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wind measurement mast is installed near the wind power plant to measure actual wind speed, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The wind power plant uses its own existing anemometer mounted on the nacelle to measure wind speed for determining potential output, rather than requiring an external measurement mast. The plant's own components serve the measurement function needed for compensation calculation.
Solution Approach 2:
The method uses characteristic curves that represent the relationship between operating parameters and potential output, creating a mathematical model that copies the plant's performance characteristics without needing physical measurement infrastructure.
2Device complexity
If the nacelle anemometer is used to measure wind speed, then device complexity is reduced, but measurement precision deteriorates due to rotor distortion
Solution Approach 1:
The method changes the approach from directly using raw anemometer measurements to using corrected values based on characteristic curves that account for rotor-induced distortions. The measurement parameters are transformed through mathematical relationships that compensate for the distortion effects.
Solution Approach 2:
Characteristic curves serve as an intermediary between the distorted anemometer measurements and the actual wind speed determination. These curves mediate the relationship by incorporating correction factors that account for rotor effects on the measurement.
3Ease of operation
If static anemometer corrections for performance-optimized mode are applied to reduced power operation, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The method transitions from static correction factors to dynamic, operating-point-specific characteristic curves. The corrections adapt to the actual operating conditions (reduced power mode) rather than assuming performance-optimized mode conditions, making the system responsive to changing operational states.
Solution Approach 2:
Different characteristic curves are used for different operating modes (performance-optimized vs. reduced power). Each operating regime has its own tailored correction characteristics, ensuring that the measurement precision is optimized for the specific local operating conditions rather than using a universal correction.
4Measurement precision
If multiple characteristic curves for different power reduction levels are stored and applied, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Characteristic curves for different power reduction levels are pre-calculated and stored in memory before operation. This preliminary preparation allows the system to quickly retrieve and apply the appropriate correction during operation without performing complex real-time calculations, balancing precision with operational simplicity.
Data Source
AI summary
A method for operating a wind power plant having at least one rotor blade, the blade angle of which can be adjusted. The wind power plant is operated with a predefinable reduced energy output set point. To determine the potential output, at least one predefinable operating parameter of the wind power plant is measured and is applied to at least one stored characteristic curve for the reduced energy output set point. The actual energy output is determined and the loss in the output is formed from the difference between the potential output and the actual energy output.