Wavelet-based time-domain double-fed induction generator differential protection

Document Type

Article

Publication Date

8-2025

Department

Department of Electrical and Computer Engineering

Abstract

Double-fed induction generators (DFIGs) must remain connected to the grid for a specific time during faults on the grid but must be immediately disconnected during short circuits inside of their protection zone, such as faults in the stator or rotor windings, to reduce potential damage risks. Currently, there is no reliable solution to discern whether a fault is external or internal to the DFIG protection zone. The differential protection appears suitable for this purpose, yet few studies have applied this protection to DFIGs. Additionally, there is insufficient evidence regarding the effectiveness of differential protection schemes in detecting faults in DFIG. This paper introduces a new algorithm for protecting the DFIG in the time domain using wavelets. The method utilizes high- and low-frequency components of the stator and rotor currents on the d- and q-axis to offer fast and dependable protection for the DFIG. The proposed approach was compared to existing differential protection regarding success rate and average response time across various events, including faults on the grid and turn-to-turn faults on the stator and rotor. The results indicate that the proposed protection outperforms the existing one and is the fastest in detecting turn-to-turn faults on the stator and rotor windings.

Publication Title

Electric Power Systems Research

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