Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through

Lihui Yang, Zhao Xu, Jacob Ostergaard, Zhao Yang Dong, Kit Po Wong

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    Abstract

    This paper presents an advanced control strategy for the rotor and grid side converters of the doubly fed induction generator (DFIG) based wind turbine (WT) to enhance the low-voltage ride-through (LVRT) capability according to the grid connection requirement. Within the new control strategy, the rotor side controller can convert the imbalanced power into the kinetic energy of the WT by increasing its rotor speed, when a low voltage due to a grid fault occurs at, e.g., the point of common coupling (PCC). The proposed grid side control scheme introduces a compensation term reflecting the instantaneous DC-link current of the rotor side converter in order to smooth the DC-link voltage fluctuations during the grid fault. A major difference from other methods is that the proposed control strategy can absorb the additional kinetic energy during the fault conditions, and significantly reduce the oscillations in the stator and rotor currents and the DC bus voltage. The effectiveness of the proposed control strategy has been demonstrated through various simulation cases. Compared with conventional crowbar protection, the proposed control method can not only improve the LVRT capability of the DFIG WT, but also help maintaining continuous active and reactive power control of the DFIG during the grid faults.
    Original languageEnglish
    JournalIEEE Transactions on Power Systems
    Volume27
    Issue number2
    Pages (from-to)713-722
    ISSN0885-8950
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Doubly fed induction generator (DFIG)
    • Low Voltage Ride Through
    • Power system fault
    • Wind turbine

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