Coupling Characteristics and Construction Method of Single-AC Multi-DC Hybrid Grid

Xingning Han, Ying Huang (), Guoteng Wang, Hui Cai, Mingxin Yan and Zheng Xu
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Xingning Han: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China
Ying Huang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Guoteng Wang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Hui Cai: Economic Research Institute, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China
Mingxin Yan: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Zheng Xu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2025, vol. 18, issue 19, 1-13

Abstract: In regions with concentrated load centers in China, the AC transmission network is dense, leading to challenges such as difficulties in power flow control and excessive short-circuit currents. The scale effect of AC grids is approaching saturation, making it imperative to develop new AC/DC hybrid grid structures. To enhance the controllability, security, and stability of AC/DC hybrid power systems, a single-AC multi-DC hybrid grid structure is proposed in this paper. The operational characteristics of this grid are analyzed in terms of power flow control capability, N-1 overload, short-circuit current, frequency stability, voltage stability, and synchronous stability, and a method for constructing the single-AC multi-DC hybrid grid is presented. Finally, simulation analysis is conducted on a typical single-AC multi-DC case, and the results indicate that this hybrid grid structure can simultaneously satisfy the controllability, security, and stability requirements of AC/DC power systems, making it a highly promising grid configuration.

Keywords: single-AC multi-DC; AC/DC hybrid grid; operational characteristics; construction principles (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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