Stand-Alone DFIG FOC Sensitivity and Stability under Mismatched Inductances

Inaki Erazo Damian, Judith Apsley, Roberto Perini, Matteo Iacchetti, Gil Marques

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    Inaccurate machine parameters can cause orientation errors and instability in field oriented control schemes relying on model-based estimations. This paper analyzes the accuracy and stability of two field oriented control schemes for a stand-alone DFIG, where the field orientation is affected by the stator inductance and stator/mutual inductance ratio. After deriving a reduced-order model accounting for parameter mismatch, the paper deduces a formula to calculate the field orientation error as a function of the inductance mismatch, revealing parameter sensitivities. A stability analysis is then carried out proving that overestimating the stator/magnetizing inductance ratio may trigger instabilities in case of high load level, whereas underestimation allows always stable operation. The theoretical insight is supported with simulation and test results on a laboratory rig.
    Original languageEnglish
    Article number8457280
    Pages (from-to)860-869
    Number of pages10
    JournalIEEE Transactions on Energy Conversion
    Issue number2
    Early online date10 Sep 2018
    Publication statusPublished - 2019


    • Doubly fed induction generators (DFIG)
    • field-oriented control
    • sensitivity
    • stability analysis
    • stand-alone


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