Minimization of Torque Ripple in the DFIG-DC System via Predictive Delay Compensation

Matteo Iacchetti, G. D. Marques

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    Abstract

    Torque ripple caused by stator current and flux harmonics is one of the main issues in the DFIG-DC system, which inherently has to operate with distorted waveforms produced by the diode commutation. This paper proposes a torque-ripple mitigation strategy based on a predictive estimation of the reciprocal of flux linkage. The predictive estimation compensates for the intrinsic delay in the actuation of the torque-ripple rejection signal through the rotor current control loops. Unlike other approaches relying on complex current regulators with selective harmonic tracking, this strategy is based on well-established Proportional-Integral (PI) controllers for the rotor currents. PI current controllers can then still have bandwidth values typical of usual DFIG systems. Simulations and experiments on a test-rig show that the compensation strategy achieves a strong torque ripple reduction and is very robust against stator frequency variations.
    Original languageEnglish
    Pages (from-to)1-11
    Number of pages11
    JournalIEEE Transactions on Industrial Electronics
    Early online date16 Jun 2017
    DOIs
    Publication statusPublished - 2017

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