Speed-Adaptive Droop Control for Doubly Fed Induction Generator-Based Gravity Energy Storage System

Darui He, Yan Li, Chengjie Cao, Yifei Fan, Fei Wang, Yuanshi Zhang and Chenwen Cheng ()
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Darui He: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210009, China
Yan Li: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210009, China
Chengjie Cao: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210009, China
Yifei Fan: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210009, China
Fei Wang: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210009, China
Yuanshi Zhang: School of Electrical Engineering, Southeast University, Nanjing 210018, China
Chenwen Cheng: School of Electrical Engineering, Southeast University, Nanjing 210018, China

Energies, 2025, vol. 18, issue 21, 1-19

Abstract: In order to ensure the reliable operation of a gravity energy storage system and reduce a converter’s cost and power rating, this paper proposes a gravity energy storage system (GESS) based on a doubly fed induction generator (DFIG). To address the issues of low inertia and limited grid-support capability, a speed-adaptive droop control strategy is introduced. The droop curve can be adjusted automatically according to the speed variation. Thereby, the GESS can effectively provide grid support through rotor-speed control. A simulation model of the DFIG-based GESS is developed in MATLAB/Simulink 2024b, and the grid-support capability of the proposed control strategy is verified under various operating conditions.

Keywords: GESS; DFIG; grid-forming control; torque-frequency droop curve; adaptive speed control (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: 2025
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