Appropriate crowbar protection for improvement of brushless DFIG LVRT during asymmetrical voltage dips

Gholizadeh, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijepes.2017.07.018
  3. Publisher: Elsevier Ltd , 2018
  4. Abstract:
  5. This paper proposes effective approach for determining appropriate crowbar resistance value to be able to improve the brushless doubly fed induction generator ride through capability during any asymmetrical voltage dip scenarios. The brushless DFIG has great potential for wind power plants particularly in offshore applications where maintenance is a major concern. Dynamic behavior of the machine is studied using two axis model and a more precise equivalent circuit model is extracted for analyzing machine behavior under fault conditions. Important limits and constraints in the use of crowbar are identified and discussed in detail. It is shown that large crowbar values can lead to considerable overvoltage which can damage the power electronics converter. Hence, crowbar voltage is an important consideration in crowbar implementation. Efficiency of the crowbar providing ride through capability is investigated for asymmetrical faults by using MATLAB/Simulink for a D180 brushless DFIG prototype. © 2017 Elsevier Ltd
  6. Keywords:
  7. Asymmetrical voltage dips ; Brushless doubly fed induction generator (BDFIG) ; Coupled circuit model ; Analog computers ; Circuit simulation ; Circuit theory ; Coupled circuits ; Electric equipment protection ; Electric fault currents ; Equivalent circuits ; Surge protection ; Wind power ; Brushless doubly fed induction generator (BDFIG) ; Coupled-circuit model ; Crowbar protection ; Low voltage ride through (LVRT) ; Voltage dip ; Asynchronous generators
  8. Source: International Journal of Electrical Power and Energy Systems ; Volume 95 , 2018 , Pages 1-10 ; 01420615 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0142061517300030