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Energies 2017, 10(11), 1863; doi:10.3390/en10111863

Short-Term Frequency Response of a DFIG-Based Wind Turbine Generator for Rapid Frequency Stabilization

1
Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Centre, Chonbuk National University, Chonju 54896, Korea
2
National Renewable Energy Laboratory, Golden, CO 80401, USA
3
Department of Electrical and Computer Engineering, University of Denver, Denver, CO 80208, USA
4
Department of Energy IT, Gachon University, Seoul 13120, Korea
5
Department of Electrical Engineering, Gyeongsang National University, Jinju 52828, Korea
*
Author to whom correspondence should be addressed.
Received: 12 October 2017 / Revised: 2 November 2017 / Accepted: 11 November 2017 / Published: 14 November 2017
(This article belongs to the Section Electrical Power and Energy System)
View Full-Text   |   Download PDF [1724 KB, uploaded 14 November 2017]   |  

Abstract

This paper proposes a short-term frequency-response scheme of a doubly-fed induction generator (DFIG)-based wind turbine generator (WTG) for improving rotor speed recovery and frequency nadir. In the energy-releasing period, to improve the frequency nadir and rotor speed convergence by releasing a large amount of kinetic energy stored in the rotating masses in a DFIG-based WTG, the power reference is increased up to the torque limit referred to the power and reduces along with it for a predefined period which is determined based on the occurrence time of the frequency nadir in a power grid. Then, the reference decreases so that the rotor speed is forced to be converged to the preset value in the stable operating region of the rotor speed. In the energy-absorbing period, to quickly recover the rotor speed, the reference smoothly decreases with the rotor speed and time during a predefined period until it intersects with the maximum power point tracking curve. The simulation results demonstrate that the proposed scheme successfully achieves rapid frequency stabilization with the improved frequency nadir under various wind conditions based on the IEEE 14-bus system. View Full-Text
Keywords: short-term frequency response; frequency nadir; doubly-fed induction generator; torque limit; frequency stabilization; rotor speed convergence short-term frequency response; frequency nadir; doubly-fed induction generator; torque limit; frequency stabilization; rotor speed convergence
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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

Yang, D.; Kang, M.; Muljadi, E.; Gao, W.; Hong, J.; Choi, J.; Kang, Y.C. Short-Term Frequency Response of a DFIG-Based Wind Turbine Generator for Rapid Frequency Stabilization. Energies 2017, 10, 1863.

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