Doubly Fed Induction Generator System Resonance Active Damping through Stator Virtual Impedance

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Abstract

The penetration of wind power has been increasing in the past few decades all over the world. Under certain non-ideal situations where the wind power generation system is connected to the weak grid, the Doubly Fed Induction Generator (DFIG) based wind power generation system may suffer High Frequency Resonance (HFR) due to the impedance interaction between the DFIG system and the weak grid network whose impedance is comparative large. Thus, it is important to implement an active damping for the HFR in order to ensure a safe and reliable operation of both the DFIG system and the grid connected converters/loads. This paper analyzes and explains first the HFR phenomenon between the DFIG system and a parallel compensated weak network (series RL + shunt C). Then on the basis of the DFIG system impedance modeling, an active damping control strategy is introduced by inserting a virtual impedance (positive capacitor or negative inductor) into the stator branch through stator current feedforward control. The effectiveness of the DFIG system active damping control is verified by a 7.5 kW experimental down-scaled DFIG system, and simulation results of a commercial 2 MW DFIG system is provided as well.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Volume64
Issue number1
Pages (from-to)125-137
Number of pages13
ISSN0278-0046
DOIs
Publication statusPublished - Jan 2017

Keywords

  • Virtual impedance
  • DFIG system impedance
  • High frequency resonance damping

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