Wind Turbine Encoder Compensation for Stable Shaft Position Sensing
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Solution Overview
Problem
Existing methods for determining the angular position and speed of a wind turbine generator shaft using encoder sensors are prone to inaccuracies due to signal distortions caused by encoder imperfections, leading to instabilities and unsuitable performance across various speed ranges.
Innovation Solution
A method that involves receiving a position signal from an encoder sensor, determining a compensation signal to address disturbances caused by encoder imperfections, and modifying the position signal by applying the compensation signal to improve accuracy. This approach decouples encoder filter tuning from imperfection compensation, allowing for more precise generator position and speed determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If previous approaches for removing signal distortions are applied, then encoder imperfections are compensated, but phase shifts occur leading to instabilities
Solution Approach 1:
The patent introduces an intermediary compensation signal that acts as a mediator between the raw encoder position signal and the control system. This compensation signal is calculated based on the relationship between position and speed components, and when applied to correct the encoder signal, it eliminates distortions without causing phase shifts that would destabilize the control system.
2Device complexity
If encoder filter tuning is coupled with imperfection compensation, then signal processing is simplified, but accuracy across different speed ranges deteriorates
Solution Approach 1:
The patent segments the signal processing into distinct functional blocks: one for encoder filter tuning and another for imperfection compensation. The compensation block specifically calculates a compensation signal based on the relationship between position and speed components, allowing accurate position and speed determination across different speed ranges without increasing overall system complexity.
3Device complexity
If encoder imperfections are not compensated, then system complexity is reduced, but measurement accuracy and control performance deteriorate
Solution Approach 1:
The patent implements a dynamic compensation approach where the compensation signal is continuously calculated based on the relationship between position and speed components. This dynamic adaptation allows the system to maintain high measurement precision across varying operating conditions and speed ranges, while the compensation mechanism itself remains computationally efficient.
Data Source
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AI summary
The invention provides a method for determining angular position of a generator shaft of a wind turbine. The method includes receiving a position signal, from an encoder position sensor of the wind turbine, indicative of an angular position of the generator shaft. The method includes determining a compensation signal to compensate for a disturbance signal in the received position signal indicative of an imperfection associated with the encoder position sensor. The method includes modifying the position signal by applying the determined compensation signal to the received position signal to determine angular position.