Scholarlink

<p>This paper presents a versatile natural flux mitigation (NFM) scheme focusing on simultaneous damping of oscillations in electromagnetic torque, stator real and reactive powers, DC-link voltage and while retaining grid-side power factor unity. This method is capable of eliminating the natural sequence fluxes (negative, fifth and seventh sequence fluxes) rotating within the air gap which are established owing to grid voltage harmonics and unbalance. The key target of this paper is to eliminate the power harmonics generated in stator power at 100&#xa0;Hz, 200&#xa0;Hz, 300&#xa0;Hz, 400&#xa0;Hz and 600&#xa0;Hz owing to the natural fluxes. A single current reference generation technique is used at RSC and GSC to mitigate the oscillations of electromagnetic torque, stator real and reactive powers and ripples in DC-link voltage. Further, the reference rotor currents (positive, negative, fifth and seventh sequence) are compared with the actual rotor currents using a PI controller to retain sinusoidal stator and grid currents. The proposed scheme’s efficacy is investigated through a 3-Hp DFIG in PSCAD/EMTDC and through a 2-MW DFIG in OPAL-RT real-time simulator.</p>

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A Versatile Natural Flux Mitigation Scheme to Eliminate Power Harmonics in DFIG under Unbalance and Harmonics in Grid Voltage

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Pydi Bala Krishna,
  • M. A. Asha Rani

摘要

This paper presents a versatile natural flux mitigation (NFM) scheme focusing on simultaneous damping of oscillations in electromagnetic torque, stator real and reactive powers, DC-link voltage and while retaining grid-side power factor unity. This method is capable of eliminating the natural sequence fluxes (negative, fifth and seventh sequence fluxes) rotating within the air gap which are established owing to grid voltage harmonics and unbalance. The key target of this paper is to eliminate the power harmonics generated in stator power at 100 Hz, 200 Hz, 300 Hz, 400 Hz and 600 Hz owing to the natural fluxes. A single current reference generation technique is used at RSC and GSC to mitigate the oscillations of electromagnetic torque, stator real and reactive powers and ripples in DC-link voltage. Further, the reference rotor currents (positive, negative, fifth and seventh sequence) are compared with the actual rotor currents using a PI controller to retain sinusoidal stator and grid currents. The proposed scheme’s efficacy is investigated through a 3-Hp DFIG in PSCAD/EMTDC and through a 2-MW DFIG in OPAL-RT real-time simulator.