Research on Additional Control Technology Based on Energy Storage System for Improving Power Transfer Capacity of Multi-Terminal AC/DC System with Low Cost

Zheng Wu, Laifu Li, Yubo Yuan, Xiaodong Yuan, Chenyu Zhang, Li Kong, Wei Pei and Wei Deng
Additional contact information
Zheng Wu: State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210024, China
Laifu Li: Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
Yubo Yuan: Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
Xiaodong Yuan: Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
Chenyu Zhang: Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China
Li Kong: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Wei Pei: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Wei Deng: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2020, vol. 13, issue 2, 1-20

Abstract: The multi-terminal AC/DC system will become one of the important forms of the future power grid. The negative impedance characteristic caused by the constant power load in the DC network will reduce the power transfer capacity between the terminals, especially when a grid fault occurs in AC system at any terminal. Energy storage has played an important role in improving the stability of AC and DC systems. This paper proposes an additional control method based on an energy storage system to improve system power transfer capacity with low cost. The state space model of two-terminal AC/DC system is established, and the feedback laws for additional control are further designed by Lyapunov theory. Furthermore, the additional control strategies based on the energy storage system is built, without changing the existing control system of each control object. Finally, the corresponding system simulation model is established by Matlab/Simulink for analysis and verification. The research results show that the proposed additional control method is effective. The power transfer limitation can be overcome by only adding small damping energy with the stable DC voltages under large disturbances, and the power transfer capacity between the terminals can be significantly improved with low control cost.

Keywords: AC/DC system; energy storage; stability; control; Lyapunov theory (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: 2020
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