Low voltage ride-through of DFIG and brushless DFIG: Similarities and differences

Tohidi, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.epsr.2013.12.018
  3. Abstract:
  4. The brushless doubly fed induction generator (BDFIG) has been proposed as a viable alternative in wind turbines to the commonly used doubly fed induction generator (DFIG). The BDFIG retains the benefits of the DFIG, i.e. variable speed operation with a partially rated converter, but without the use of brush gear and slip rings, thereby conferring enhanced reliability. As low voltage ride-through (LVRT) performance of the DFIG-based wind turbine is well understood, this paper aims to analyze LVRT behavior of the BDFIG-based wind turbine in a similar way. In order to achieve this goal, the equivalence between their two-axis model parameters is investigated. The variation of flux linkages, back-EMFs and currents of both types of generator are elaborated during three phase voltage dips. Moreover, the structural differences between the two generators, which lead to different equivalent parameters and hence different LVRT capabilities, are investigated. The analytical results are verified via time-domain simulations for medium size wind turbine generators as well as experimental results of a voltage dip on a prototype 250 kVA BDFIG
  5. Keywords:
  6. Doubly fed induction generator (DFIG), Brushless doubly fed induction generator (BDFIG), Low voltage ride-through (LVRT), Voltage dip ; Wind turbine
  7. Source: Electric Power Systems Research ; Vol. 110 , May , 2014 , p. 64-72 ; ISSN: 03787796
  8. URL: http://www.sciencedirect.com/science/article/pii/S0378779614000042