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 Sørensen and Yong Cheol Kang
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Hyewon Lee: Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Center, Chonbuk National University, Chonju 54896, Korea
Min Hwang: Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Center, Chonbuk National University, Chonju 54896, Korea
Eduard Muljadi: National Renewable Energy Laboratory, Golden, CO 80401, USA
Poul Sørensen: Department of Wind Energy, Technical University of Denmark, 4000 Roskilde, Denmark
Yong Cheol Kang: Department of Electrical Engineering, WeGAT Research Center, and Smart Grid Research Center, Chonbuk National University, Chonju 54896, Korea

Energies, 2017, vol. 10, issue 4, 1-13

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.

Keywords: power smoothing; doubly-fed induction generator; frequency regulation; adaptive gain; rotor speed; frequency deviation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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