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

Yien Xu, Pei Chen, Xinsong Zhang and Dejian Yang
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Yien Xu: School of Electrical Engineering, Nantong University, Nantong 226019, China
Pei Chen: School of Electrical Engineering, Nantong University, Nantong 226019, China
Xinsong Zhang: School of Electrical Engineering, Nantong University, Nantong 226019, China
Dejian Yang: Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, China

Energies, 2021, vol. 14, issue 23, 1-15

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 (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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