Detection and Localization of Rotor Winding Inter-Turn Short Circuit Fault in DFIG Using Zero-Sequence Current...

Area of Science:

• Electrical Engineering
• Power Systems
• Renewable Energy

Background:

• Doubly-fed induction generators (DFIGs) are susceptible to inter-turn short circuit (ITSC) faults in rotor windings due to converter-induced stress.
• Detecting these faults is challenging due to DFIG's complex dynamics and multi-mode operation.

Purpose of the Study:

• To develop and validate a comprehensive online methodology for diagnosing ITSC faults in DFIG rotor windings.
• To address the challenges posed by variable operating conditions and DFIG's operational flexibility.

Main Methods:

• Analysis of the DFIG mathematical model to identify fault features.
• Development of a simple algorithm for online implementation of the fault diagnosis methodology.
• Simulation of the DFIG model in MATLAB/Simulink under diverse operating conditions (sub-synchronous, super-synchronous, variable loads, low-frequency).

Main Results:

• The proposed methodology effectively detects ITSC faults at an early, low-severity stage.
• Precise identification of the faulty phase within the DFIG rotor windings was achieved.
• Validation across sub-synchronous and super-synchronous modes under varied conditions.

Conclusions:

• The developed zero-sequence current (ZSC) component analysis provides an effective online solution for ITSC fault diagnosis in DFIG rotor windings.
• The methodology demonstrates robustness under various operational scenarios and fault severities.