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Volume 14
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Article

An Improved Droop Control Scheme of a Doubly-Fed Induction Generator for Various Disturbances

by
Yien Xu
1,
Pei Chen
1,
Xinsong Zhang
1,* and
Dejian Yang
2,*
1
School of Electrical Engineering, Nantong University, Nantong 226019, China
2
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, China
*
Authors to whom correspondence should be addressed.
Energies 2021, 14(23), 7980; https://doi.org/10.3390/en14237980
Submission received: 25 October 2021 / Revised: 22 November 2021 / Accepted: 25 November 2021 / Published: 29 November 2021
(This article belongs to the Special Issue Advances in Power System Analysis and Control)
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Abstract

Doubly-fed induction generators (DFIGs) participate in the system frequency regulation using a fixed-coefficient droop control scheme. Nevertheless, the frequency-supporting capability of this control scheme with fixed gain is limited for different disturbances. This paper suggests an improved droop control scheme for a DFIG that can both alleviate the frequency nadir and maximum rate of change of frequency (ROCOF) during the frequency regulation. To achieve this, an adaptive droop control coefficient based on the ROCOF is suggested. The proposed droop control coefficient is a linear function of the ROCOF. Therefore, the proposed scheme can adjust the control coefficient according to the varying ROCOF. Simulation results clearly demonstrate that the proposed droop control scheme shows better effectiveness in improving the maximum ROCOF and frequency nadir under various sizes of disturbance, even in a varying wind speed.
Keywords: doubly-fed induction generator; adaptive droop coefficient; wind power; frequency nadir; ROCOF doubly-fed induction generator; adaptive droop coefficient; wind power; frequency nadir; ROCOF

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MDPI and ACS Style

Xu, Y.; Chen, P.; Zhang, X.; Yang, D. An Improved Droop Control Scheme of a Doubly-Fed Induction Generator for Various Disturbances. Energies 2021, 14, 7980. https://doi.org/10.3390/en14237980

AMA Style

Xu Y, Chen P, Zhang X, Yang D. An Improved Droop Control Scheme of a Doubly-Fed Induction Generator for Various Disturbances. Energies. 2021; 14(23):7980. https://doi.org/10.3390/en14237980

Chicago/Turabian Style

Xu, Yien, Pei Chen, Xinsong Zhang, and Dejian Yang. 2021. "An Improved Droop Control Scheme of a Doubly-Fed Induction Generator for Various Disturbances" Energies 14, no. 23: 7980. https://doi.org/10.3390/en14237980

APA Style

Xu, Y., Chen, P., Zhang, X., & Yang, D. (2021). An Improved Droop Control Scheme of a Doubly-Fed Induction Generator for Various Disturbances. Energies, 14(23), 7980. https://doi.org/10.3390/en14237980

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