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Energies 2017, 10(4), 555; doi:10.3390/en10040555

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

1
Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Center, Chonbuk National University, Chonju 54896, Korea
2
National Renewable Energy Laboratory, Golden, CO 80401, USA
3
Department of Wind Energy, Technical University of Denmark, 4000 Roskilde, Denmark
4
Department of Electrical Engineering, WeGAT Research Center, and Smart Grid Research Center, Chonbuk National University, Chonju 54896, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 16 December 2016 / Revised: 4 April 2017 / Accepted: 5 April 2017 / Published: 18 April 2017
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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. View Full-Text
Keywords: power smoothing; doubly-fed induction generator; frequency regulation; adaptive gain; rotor speed; frequency deviation power smoothing; doubly-fed induction generator; frequency regulation; adaptive gain; rotor speed; frequency deviation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, H.; Hwang, M.; Muljadi, E.; Sørensen, P.; Kang, Y.C. Power-Smoothing Scheme of a DFIG Using the Adaptive Gain Depending on the Rotor Speed and Frequency Deviation. Energies 2017, 10, 555.

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