Adaptive Gain-based Stable Power Smoothing of a DFIG

Eduard Muljadi, Hyewon Lee, Min Hwang, Jinsik Lee, Hong-Ju Jung, Yong Kang

Research output: Contribution to journalArticlepeer-review


In a power system that has a high wind penetration, the output power fluctuation of a large-scale wind turbine generator (WTG) caused by the varying wind speed increases the maximum frequency deviation, which is an important metric to assess the quality of electricity, because of the reduced system inertia. This paper proposes a stable power-smoothing scheme of a doubly-fed induction generator (DFIG) that can suppress the maximum frequency deviation, particularly for a power system with a high wind penetration. To do this, the proposed scheme employs an additional control loop relying on the system frequency deviation that operates in combination with the maximum power point tracking control loop. To improve the power-smoothing capability while guaranteeing the stable operation of a DFIG, the gain of the additional loop is modified with the rotor speed and frequency deviation. The gain is set to be high if the rotor speed and/or frequency deviation is large. The simulation results based on the IEEE 14-bus system demonstrate that the proposed scheme significantly lessens the output power fluctuation of a WTG under various scenarios by modifying the gain with the rotor speed and frequency deviation, and thereby it can regulate the frequency deviation within a narrow range.
Original languageAmerican English
Pages (from-to)2099-2105
Number of pages7
JournalJournal of Electrical Engineering and Technology
Issue number6
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5D00-70569


  • and stable operation
  • frequency deviation
  • kinetic energy
  • power fluctuation
  • power smoothing
  • rotor speed


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