Abstract
Inter-turn short circuit fault (ITSCF) can be a great threat for the safety and effectiveness of the generator. In this paper, a simulation model with the experimental platform is established to diagnose the ITSCF in stator windings. A simulation model based on the Finite Element Method (FEM) is designed in ANSYS. Stator current is used for calculating the Root-Mean-Square (RMS) value, phase difference, symmetrical components, Park’s vector trajectory’s and Total Harmonic Distortion (THD). It was found that when ITSCF happened, three phase currents in stator is no longer symmetrical. The ratio of negative to positive sequence of current raises from 0.40 to 14.18 in simulation and 0.52 to 19.89 in the experiment from normal condition to 7 turns shorted. The same trend was seen in Park’s vector trajectory analysis where the eccentricity raises from 0.03 to 0.65 in simulation and 0.14 to 0.75 in the experiment. Phase difference of the three phases is at 120° degree deviation as the ITSCF occurs in stator winding. THD also increased with the increase in the fault level. The results show a good consistency of simulation with experimental results. It was found that the analysis performed in this research are major indications for serious fault in DFIG.
Highlights
Power generation through wind is one of the most auspicious source of renewable energy, which is getting massive attention from the last few decades because of environment pollution and energy crisis in many countries [1]–[3]
From these 37% stator faults most faults are linked with stator windings faults and are initiated from inter-turn short-circuit fault (ITSCF)
In this paper study of Finite Element Method (FEM) simulation and experiment of stator ITSCF in Doubly-Fed Induction Generator (DFIG) was carried out
Summary
Power generation through wind is one of the most auspicious source of renewable energy, which is getting massive attention from the last few decades because of environment pollution and energy crisis in many countries [1]–[3]. Y. Chen et al.: Numerical Modeling, Electrical Characteristics Analysis and Experimental Validation phase-to-ground short-circuit faults [8]–[11]. Stefani A. built a 3.3kW doubly fed induction generator and experiment about the unbalanced fault [17] They set resistance in rotor and stator phase to simulate faults. B. STATOR FAULT MODEL IN ANSYS Generally, there are different ways to establish a DFIG geometrical model. EXPERIMENTAL SETUP Doubly fed induction generator (100 kW), converter, drive motor, data acquisition system, control system and short-circuit cabinet were the main components in this experiment. Outgoing wires are labelled from node 1 to node 8, two to eight turns short-circuit can be accomplished by shutting off these switches These ITSCFs are made both in the simulation model and in an experimental setup in the same way.
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