Wind Turbine Insulation Dry-Out Control Using Climate Feedback
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Solution Overview
Problem
Existing wind turbine systems rely on predetermined dry-out durations after grid restoration, leading to excessive downtime due to assumptions about moisture content in hygroscopic insulation, which can result in unnecessary revenue loss.
Innovation Solution
A method and system that uses existing sensors to measure temperature and humidity, estimate electrical resistance of hygroscopic materials, and evaluate the need for a dry-out procedure based on these measurements, allowing safe and timely restart of the wind turbine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined dry-out duration is used to ensure safe restart, then the reliability of the wind turbine restart is improved, but the downtime and loss of productivity increase significantly
Solution Approach 1:
The system continuously monitors temperature and humidity measurements from sensors and uses this feedback to dynamically determine when the dry-out process is complete. The controller compares real-time measurements against threshold values to automatically decide when restart is safe, eliminating the need for fixed predetermined durations and enabling earlier restart when conditions permit.
Solution Approach 2:
The patent replaces the mechanical/time-based dry-out approach with a sensor-based measurement and evaluation system. Instead of relying on predetermined time durations, the system uses temperature sensors, humidity sensors, and a controller to objectively assess the actual moisture content and thermal state of the insulation material, enabling data-driven restart decisions.
2Reliability
If a long predetermined dry-out time is used to cover all possible situations, then the safety margin is improved, but the unnecessary delays and revenue loss increase
Solution Approach 1:
The system transitions from a static, fixed-duration dry-out approach to a dynamic, condition-based approach. The dry-out duration is not predetermined but adapts based on real-time temperature and humidity measurements, allowing the system to extend the dry-out period only as long as necessary to achieve safe moisture levels, thereby eliminating unnecessary delays while maintaining adequate safety margins.
Solution Approach 2:
The system monitors changes in temperature and humidity parameters to determine dry-out completion. By tracking the progression of these physical parameters over time and comparing them against predetermined threshold values, the system can objectively determine when the insulation material has reached acceptable moisture levels, enabling restart decisions based on actual physical state rather than arbitrary time durations.
3Measurement precision
If direct measurement of winding resistance is implemented, then the precision of moisture content assessment is improved, but the device complexity and measurement difficulty increase
Solution Approach 1:
The system uses temperature and humidity sensors as intermediary measurement devices that indirectly assess the moisture content of the insulation material. Rather than directly measuring winding resistance which would require complex electrical testing and disassembly, the system measures the environmental conditions (temperature and humidity) that directly influence moisture absorption, providing a practical and non-invasive assessment method.
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
Minimizes downtime by ensuring the wind turbine can be restarted only after a necessary dry-out, reducing unnecessary delays and revenue loss.
Implementation Method 1
the insulating material will absorb moisture from the air under certain conditions
Data Source
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AI summary
The invention describes a method of controlling a wind turbine (2), which method comprises steps of measuring one or more climate parameters (Φt, Tair, Tsurface) in an interior (2int) of the wind turbine (2); estimating, on the basis of the climate parameters (Φt, Tair, Tsurface), the electrical resistance (RWt) of an insulating material (210M) deployed in an electrical component (21) of the wind turbine (2); and evaluating the need for a dry-out procedure on the basis of the estimated resistance (RWt). The invention further describes a wind turbine (2) with a monitoring arrangement (1) configured to perform the inventive method.