Virtual Damping Flux-Based LVRT Control for DFIG-Based Wind Turbine

Rongwu Zhu, Zhe Chen, Xiaojie Wu, Fujin Deng

Research output: Contribution to journalJournal articleResearchpeer-review

61 Citations (Scopus)

Abstract

This paper proposes a virtual damping flux-based low-voltage ride through (LVRT) control strategy for a doubly fed induction generator (DFIG)-based wind turbine. During the transient states of grid voltage drop and recovery, the proposed virtual damping flux-based strategy can suppress rotor current with a smooth electromagnetic torque. During steady-state faults, a negative sequence current compensation strategy is adopted to smooth the electromagnetic torque and reactive power for asymmetrical grid faults, while the conventional vector control is used to inject reactive power into the grid to support grid voltage for symmetrical grid faults. The effectiveness of the proposed strategies is examined by the simulation with a 2-MW DFIG in MATLAB/Simulink and verified by the experimental results from a scaled-down 7.5-kW DFIG controlled by a DSPACE1006. In addition, the impacts of the magnetic nonlinearity characteristics of a practical DFIG are investigated under asymmetrical grid faults. Although the magnetic nonlinearity characteristics degrade the control effects, the proposed strategies can still improve the DFIG performances during asymmetrical grid faults. The results clearly demonstrate that the proposed strategies can effectively improve the DFIG transient behavior and achieve LVRT performances.
Original languageEnglish
JournalI E E E Transactions on Energy Conversion
Volume30
Issue number2
Pages (from-to)714 - 725
Number of pages12
ISSN0885-8969
DOIs
Publication statusPublished - Jun 2015

Keywords

  • Doubly fed induction generator (DFIG)
  • Low-voltage ride through (LVRT)
  • Virtual damping flux control
  • Wind turbine (WT)

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