Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Controlling Zero Sequence Component in DVR for Compensating Unbalanced Voltage Dip of a DFIG

  • Ko, JiHan (Multidisciplinary Graduate School for Wind Energy, Jeju National University) ;
  • Thinh, Quach Ngoc (Department of Electrical Engineering, Jeju National University) ;
  • Kim, SeongHuyn (Department of Electrical Engineering, Jeju National University) ;
  • Kim, Eel-Hwan (Department of Electrical Engineering, Jeju National University)
  • Published : 2012.07.03
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Abstract

The dynamic voltage restorer (DVR) is an effective protection device for wind turbine generator based on doubly-fed induction generator (DFIG) operated under the unbalanced voltage dip conditions. The compensating voltages of DVR depend on the voltage dips and on the influence of the zero sequence components. If the $Y_0/{\Delta}$ step-up transformers are used, there are no zero sequence components on the DFIG side. However, if the $Y_0/Y_0$ step-up transformers are used, the zero sequence components will appear during faults. The zero sequence components result in the high insulation costs and the asymmetric of the terminal voltages. This paper proposes a method for controlling zero sequence components in DVR to protect DFIG under unbalanced voltage dips. Simulation results are presented to verify the effectiveness of the proposed control method.

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