Power-Smoothing Scheme of a DFIG Using the Adaptive Gain Depending on the Rotor Speed and Frequency Deviation

Hyewon Lee, Min Hwang, Eduard Muljadi, Poul Ejnar Sørensen, Yong Cheol Kang

Research output: Contribution to journalJournal articleResearchpeer-review

297 Downloads (Pure)

Abstract

In an electric power grid that has a high penetration level of wind, the power fluctuation of a large-scale wind power plant (WPP) caused by varying wind speeds deteriorates the system frequency regulation. This paper proposes a power-smoothing scheme of a doubly-fed induction generator (DFIG) that significantly mitigates the system frequency fluctuation while preventing over-deceleration of the rotor speed. 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 preventing over-deceleration of the rotor speed, 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 clearly demonstrate that the proposed scheme significantly lessens the output power fluctuation of a WPP 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 languageEnglish
Article number555
JournalEnergies
Volume10
Issue number4
Number of pages13
ISSN1996-1073
DOIs
Publication statusPublished - 2017

Bibliographical note

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution.

Keywords

  • Power smoothing
  • Doubly-fed induction generator
  • Frequency regulation
  • Adaptive gain
  • Rotor speed
  • Frequency deviation

Fingerprint Dive into the research topics of 'Power-Smoothing Scheme of a DFIG Using the Adaptive Gain Depending on the Rotor Speed and Frequency Deviation'. Together they form a unique fingerprint.

Cite this