Stator Inter-turn Fault Analysis in Doubly-Fed Induction Generators using rotor current based on Finite Element Analysis

It is interesting to detect stator inter-turn fault, which can cause phase to ground or phase to phase short circuits in the stator. First, two major harmonics are found in the rotor current of doubly-fed Induction Generator with stator inter-turn fault through electromagnetic analysis. By building the model of doubly fed induction generator based on finite element analysis, the simulation result shows the magnitude of the harmonic component of the rotor current at frequency (2-s)f increases more significantly with the stator inter-turn fault. So it is more sensitive to detect the stator inter-turn fault. It is verified with experimental results.

I. Introduction

Wind power, an energy supplement, has gained rapid development worldwide due to its clean, pollution-free and renewable nature. Widely used in the wind power sector, double-fed wind motors easily enable variable speed and constant frequency, flexible independent active and reactive power adjustment, and smaller rotor excitation capacity. In order to effectively reduce fan repair costs and extend the service life, it is necessary to carry out fault analysis and diagnosis research on double-fed asynchronous motors.