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A Novel Dynamic Energy Model and Damping Evaluation Method of DFIG Grid-connected System
ID：105 View Protection：ATTENDEE Updated Time：2022-05-24 08:33:23 Hits：370 Poster Presentation

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Abstract
Aiming at the uncertain mechanism of sub-synchronous oscillation caused by the connection of DFIG and series compensation equipment, this paper proposes a method for analyzing the damping characteristics of sub-synchronous oscillations based on dynamic energy model. Firstly, using the dynamic energy of the DFIG and series compensation, combined with the induction generator equation of the DFIG, the converter control equation and the series compensation equation, the dynamic energy function under the electromagnetic transient scale is constructed. On this basis, considering the actual measurement conditions, calculating the dynamic energy under  sub-synchronous frequency disturbance, obtaining the oscillation energy reflecting the interaction of the DFIG turbine and series compensation, and then construct the oscillation energy stability criterion for grid-connected system of the DFIG. Quantitative analysis of the energy interaction between the DFIG and series compensation by the oscillation energy reveals the influence mechanism of series compensation on the sub-synchronous oscillation. Finally, combined with the DFIG actual parameters, the above method is verified on the RT-LAB simulation platform. The results show that the dynamic energy can accurately reflect the influence of DFIG-Series compensation, which showing negative damping characteristics in the sub-synchronous oscillation.
 
Keywords
DFIG; Sub-synchronous oscillation; Dynamic energy model; Damping characteristics
Speaker
ZhaoDong
国网经济技术研究院有限公司

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Important Date

  • Conference Date

    May 27

    2022

    to

    May 29

    2022

  • Feb 28 2022

    Draft paper submission deadline

  • May 29 2022

    Registration deadline

  • Jun 22 2022

    Contribution Submission Deadline

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IEEE Beijing Section
China Electrotechnical Society
Southeast University
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IEEE Industry Applications Society
IEEE Nanjing Section
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