DFIG Wye-Ring Crack Detection via Phase Voltage Fourier Analysis
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Solution Overview
Problem
Current methods for detecting defects in the wye-ring of a doubly-fed induction generator (DFIG) rotor in wind turbines require offline testing, leading to energy loss and increased maintenance costs due to the need for partial dismantling and shutdown of the turbine.
Innovation Solution
A fault detection system that includes three sensors to measure voltages of each phase of the wye-ring and applies a Fourier transform to identify physical asymmetry, providing an early warning of potential damage through fault indicators without requiring the turbine to be taken offline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline testing with turbine shutdown and partial dismantling is performed, then crack detection accuracy is improved, but energy production loss and maintenance cost increase
Solution Approach 1:
The patent applies preliminary action by implementing continuous online monitoring of the wye-ring using voltage sensors and signal injection during normal turbine operation. This allows crack detection to be performed in advance before critical failures occur, eliminating the need for shutdown-based testing and preventing energy production loss while maintaining detection capability.
2Measurement precision
If offline testing with turbine shutdown and partial dismantling is performed, then crack detection accuracy is improved, but maintenance cost increases
Solution Approach 1:
The patent applies self-service by enabling the wye-ring to be monitored autonomously during operation through integrated voltage sensors and signal processing circuits that continuously assess crack conditions. This eliminates the need for external intervention, partial dismantling, and expensive offline testing equipment, significantly reducing maintenance costs while maintaining detection accuracy.
3Reliability
If the turbine is taken offline for testing, then accurate fault diagnosis is achieved, but productivity decreases
Solution Approach 1:
The patent applies continuity of useful action by maintaining both the turbine's power generation function and the crack detection function simultaneously during operation. The online monitoring system continuously injects test signals and processes voltage measurements without interrupting energy production, ensuring both productivity and diagnostic reliability are maintained throughout the turbine's operational life.
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
Enables early identification of defects, reducing repair costs and avoiding extended outages by allowing for proactive maintenance and prioritization of repairs in a wind park setting.
Implementation Method 1
Each sensor is configured to electrically couple with and measure a respective voltage of each phase of the three-phase wye-ring
Implementation Method 2
The alert system is configured to apply a Fourier transform to the respective measured voltages of each phase of the three-phase wye-ring
Data Source
AI summary
A fault detection system for a wind turbine includes a doubly-fed induction generator (DFIG). The DFIG includes a wye-ring configured for at least three electrical phases. The fault detection system includes a data acquisition system including at least three sensors. Each sensor of said at least three sensors is configured to electrically couple with and measure a respective voltage of each phase of the at least three electrical phases of the wye-ring. The fault detection system further includes an alert system coupled to said data acquisition system. The alert system is configured to apply a Fourier transform to the respective measured voltages of each phase of the at least three electrical phases of the wye-ring. The alert system is further configured to provide an indication of a condition of the wye-ring based upon the transformed measured voltages.