Wind Turbine Drivetrain Slip Detection With Dual Speed Signals
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Solution Overview
Problem
Wind turbines face damage due to generator speed not being a reliable proxy for rotor speed when drivetrain connections slip, leading to excessive rotor speeds and thrust loads.
Innovation Solution
Implement a system using rate gyroscopes to estimate rotational speed signals at multiple locations along the drivetrain, account for bias, and compare these signals to detect deviations, triggering control actions when errors exceed a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If generator speed is used as a proxy for rotor speed, then the control system is simple to operate, but the measurement reliability deteriorates when drivetrain connections slip
Solution Approach 1:
The drivetrain is segmented into multiple measurement locations (rotor side and generator side) with separate speed sensors installed at each location. This segmentation allows independent measurement of speeds at different points in the drivetrain, enabling detection of slip events between components while maintaining simple control logic.
Solution Approach 2:
A controller acts as an intermediary that receives speed signals from both rotor and generator sides, compares these signals to detect deviations, and automatically implements control actions. This intermediary processing layer maintains ease of operation while significantly improving measurement reliability through cross-validation of speed data.
2Reliability
If multiple speed sensors are installed at different locations, then the reliability of speed measurement improves, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions: it serves as the primary control system for turbine operation, the speed comparison unit for detecting drivetrain slip, and the actuator for implementing protective control actions. This multi-functionality eliminates the need for separate dedicated slip detection hardware, improving reliability without increasing overall device complexity.
Solution Approach 2:
The existing speed sensors and controller infrastructure are utilized for dual purposes: normal turbine control and drivetrain slip detection. The system serves itself by using its own operational data (speed signals already being collected for control) to detect anomalies, avoiding additional sensor installations and reducing complexity.
3Reliability
If the controller continuously monitors speed deviations and implements control actions, then the protection against drivetrain damage is improved, but the loss of time for turbine operation increases
Solution Approach 1:
The system continuously monitors speed deviations and detects potential slip events before they cause significant drivetrain damage. By implementing control actions at the early stage of deviation detection, the system prevents progression to catastrophic failure, thereby protecting the drivetrain while minimizing operational disruption through early intervention rather than reactive shutdowns.
Solution Approach 2:
The control system dynamically adjusts its response based on the magnitude and duration of detected speed deviations. For minor, transient deviations, the system may apply corrective control actions to restore proper operation without shutdown. For persistent or severe deviations indicating actual slip events, the system implements protective shutdowns. This dynamic response optimizes both protection reliability and operational time retention.
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
Effectively detects drivetrain slip events, preventing turbine damage by adjusting operations such as shutting down or derating the turbine, thereby maintaining safety and efficiency.
Implementation Method 1
estimating, via a controller, a first rotational speed signal at a first location along the drivetrain via one or more rate gyroscopes mounted in the wind turbine
Data Source
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AI summary
A method for detecting and responding to a failure in a drivetrain of a wind turbine includes estimating a first rotational speed signal at a first location along the drivetrain via one or more rate gyroscopes mounted in a hub, the first rotational speed signal being a proxy for rotor speed of a rotor. The method also includes processing the first rotational speed signal to account for a bias in the first rotational speed signal due to use of the rate gyroscope(s). Further, the method includes receiving a second rotational speed signal at a second location along the drivetrain, the second location being downwind from the first location, the first and second locations being on opposing sides of a potential slip location of the drivetrain. Moreover, the method includes determining a speed error based on a comparison of the first and second rotational speed signals. In addition, the method includes comparing the speed error to a threshold and implementing a control action when the speed error exceeds the threshold.