Disturbance-Adaptive Short-Term Frequency Support of a DFIG Associated With the Variable Gain Based on the ROCOF and Rotor Speed

Eduard Muljadi, Min Hwang, Gilsoo Jang, Yong Kang

Research output: Contribution to journalArticle

77 Scopus Citations

Abstract

This paper proposes a disturbance-adaptive short-term frequency support scheme of a doubly fed induction generator (DFIG) that can improve the frequency-supporting capability while ensuring stable operation. In the proposed scheme, the output of the additional control loop is determined as the product of the frequency deviation and adaptive gain, which is modified depending on the rate of change of frequency (ROCOF) and rotor speed. To achieve these objectives, the adaptive gain is set to be high during the early stage of a disturbance, when the ROCOF and rotor speed are high. Until the frequency nadir (FN), the gain decreases with the ROCOF and rotor speed. After the FN, the gain decreases only with the rotor speed. The simulation results demonstrate that the proposed scheme improves the FN and maximum ROCOF while ensuring the stable operation of a DFIG under various wind conditions irrespective of the disturbance conditions by adaptively changing the control gain with the ROCOF and rotor speed, even if the wind speed decreases and a consecutive disturbance occurs.
Original languageAmerican English
Pages (from-to)1873-1881
Number of pages9
JournalIEEE Transactions on Power Systems
Volume32
Issue number3
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5D00-68490

Keywords

  • adaptive gain
  • disturbance-adaptive
  • frequency nadir (FN)
  • short-term frequency support (STFS)
  • stable operation

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