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

Dejian Yang, Moses Kang, Eduard Muljadi, Wenzhong Gao, Junhee Hong, Jaeseok Choi and Yong Cheol Kang
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Dejian Yang: Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Centre, Chonbuk National University, Chonju 54896, Korea
Moses Kang: Department of Electrical Engineering and Wind Energy Grid-Adaptive Technology (WeGAT) Research Centre, Chonbuk National University, Chonju 54896, Korea
Eduard Muljadi: National Renewable Energy Laboratory, Golden, CO 80401, USA
Wenzhong Gao: Department of Electrical and Computer Engineering, University of Denver, Denver, CO 80208, USA
Junhee Hong: Department of Energy IT, Gachon University, Seoul 13120, Korea
Jaeseok Choi: Department of Electrical Engineering, Gyeongsang National University, Jinju 52828, Korea
Yong Cheol Kang: Department of Energy IT, Gachon University, Seoul 13120, Korea

Energies, 2017, vol. 10, issue 11, 1-14

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.

Keywords: short-term frequency response; frequency nadir; doubly-fed induction generator; torque limit; frequency stabilization; rotor speed convergence (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 references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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