Advanced control strategy of DFIG wind turbines for power system fault ride through

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

261 Citations (Scopus)

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
Article number6112194
Pages (from-to)713-722
Number of pages10
JournalIEEE Transactions on Power Systems
Volume27
Issue number2
DOIs
Publication statusPublished - 1 May 2012

Keywords

  • Doubly fed induction generator (DFIG)
  • low voltage ride through
  • power system fault
  • wind turbine

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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