Stator and Rotor Current-Based Detection of Stator Winding Fault in a Doubly Fed Induction Generator

Abstract

Inter-turn short circuits are among the most critical electrical faults in induction machines. This type of fault may worsen if not detected at an early stage. Its detection allows planning interventions and providing both short-term and long-term solutions. To improve the sensitivity of fault detection in Double-Fed Induction Generator (DFIG), this study presents a fault indicator based on Park's vector currents of the stator and rotor. The eccentricity of the ellipse formed by stator currents and the thickness of the rotor currents ring in DQ plane will be used to quantify the short-circuit rate. The combined application of these indicators could increase the fault detection accuracy. The DFIG model under ITSCF conditions is presented. The results obtained with the proposed approach are verified through simulations and validated on an experimental test bench. The effectiveness of the developed severity index has been demonstrated.