### Abstract

Efficient fault detection in generators often
require prior knowledge of fault behavior, which can
be obtained from theoretical analysis, often carried
out by using discrete models of a given generator.
Mathematical models are commonly represented in
the DQ0 reference frame, which is convenient in
many areas of electrical machine analysis. However,
for fault investigations, the phase-coordinate representation
has been found more suitable. This paper
presents a mathematical model in phase coordinates
of the DFIG with two parallel windings per rotor
phase. The model has been implemented in Matlab
and its properties in context of fault simulations and
investigations has been investigated. Some of the
most common faults have been simulated, namely
broken rotor bars or windings, dynamic eccentricities
and stator phase winding short circuits. These
fault conditions propagate to the stator current as
undesired spectral components, which can be detected
by applying frequency spectrum analysis.

Original language | English |
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Title of host publication | Proceedings of NORDIS-15 |

Number of pages | 6 |

Publication date | 2015 |

Publication status | Published - 2015 |

Event | 24th Nordic Insulation Symposium on Materials, Components and Diagnostics - Copenhagen, Denmark Duration: 15 Jun 2015 → 17 Jun 2015 |

### Conference

Conference | 24th Nordic Insulation Symposium on Materials, Components and Diagnostics |
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Country | Denmark |

City | Copenhagen |

Period | 15/06/2015 → 17/06/2015 |

### Keywords

- Wind turbine generators
- Doubly-fed induction generators
- Mathematical modelling
- Fault investigations

## Cite this

Martens, S., Mijatovic, N., Holbøll, J., Skrimpas, G. A., & Sweeney, C. W. (2015). Simulation of Electric Faults in Doubly-Fed Induction Generators Employing Advanced Mathematical Modelling. In

*Proceedings of NORDIS-15*