Simulation of Electric Faults in Doubly-Fed Induction Generators Employing Advanced Mathematical Modelling

Sebastian Martens, Nenad Mijatovic, Joachim Holbøll, Georgios Alexandros Skrimpas, Christian W. Sweeney

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    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 languageEnglish
    Title of host publicationProceedings of NORDIS-15
    Number of pages6
    Publication date2015
    Publication statusPublished - 2015
    Event24th Nordic Insulation Symposium on Materials, Components and Diagnostics - Copenhagen, Denmark
    Duration: 15 Jun 201517 Jun 2015
    Conference number: 24

    Conference

    Conference24th Nordic Insulation Symposium on Materials, Components and Diagnostics
    Number24
    Country/TerritoryDenmark
    CityCopenhagen
    Period15/06/201517/06/2015

    Keywords

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

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