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Title: Adaptive Gain-based Stable Power Smoothing of a DFIG

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. Here, 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 amore » narrow range.« less
ORCiD logo [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Chonbuk National Univ., Jeonju (Republic of Korea)
  3. Korea Electric Association (KEA), Seoul (Korea)
  4. Hyosung Corp. (South Korea)
Publication Date:
Report Number(s):
Journal ID: ISSN 1975-0102
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Electrical Engineering & Technology
Additional Journal Information:
Journal Volume: 12; Journal Issue: 6; Journal ID: ISSN 1975-0102
Korean Institute of Electrical Engineers
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
24 POWER TRANSMISSION AND DISTRIBUTION; frequency deviation; kinetic energy; power fluctuation; power smoothing; rotor speed; and stable operation
OSTI Identifier: