Application of Ensemble Empirical Mode Decomposition on Stator Inter-turn Short-Circuit Fault in Doubly Fed Induction Generators

Abstract

The stator winding inter-turn short-circuit fault is one of the common faults of doubly fed induction generator (DFIG). In this paper, the multi-loop theory is used for the mathematical modeling, while different faults under different conditions are simulated by MATLAB. Due to the drawbacks in the EMD decomposition method, the results of decomposition cannot distinguish the inter-turn short-circuit fault from some non-fault conditions, while, by introducing the EEMD decomposition method, the problem can be solved. Using the new method, the voltage imbalance, variable rotor speed, and other factors on the interference in the process of inter-turn short-circuit fault diagnosis can be ruled out; therefore, the result of the current spectrum analysis is more reliable. EEMD method can provide a more reliable guarantee for stator inter-turn short-circuit fault detection.