Evaluation System of AC/DC Strong–Weak Balance Relationship and Stability Enhancement Strategy for the Receiving-End Power Grid

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

Energies, 2025, vol. 18, issue 16, 1-20

Abstract: With the maturation of ultra-high-voltage direct current (UHVDC) technology, DC grids are taking on a more critical role in power systems. However, their impact on AC grids has become more pronounced, particularly in terms of frequency, short-circuit current level, and power flow control capabilities, which also affects the power supply reliability of the receiving-end grid. To comprehensively evaluate the balance between AC and DC strength at the receiving-end, this paper proposes a multidimensional assessment system that covers grid strength and operational security under various operating conditions. Furthermore, a rationality evaluation model for the AC/DC strong–weak balance relationship is developed based on the entropy weight method, forming a complete evaluation framework for assessing the AC/DC strong–weak balance in the receiving-end power grid. Finally, to address strength imbalances in grid, a structural optimization method for the receiving-end grid is designed by combining network decoupling techniques with modular multilevel converter-based HVDC (MMC–HVDC), serving as a strategy for enhancing grid stability. The proposed strategy is validated through simulations in a typical test system using PSD-BPA, demonstrating its effectiveness in optimizing power flow characteristics, improving system stability, reducing the risk of short-circuit current overloads and large-scale blackouts, and maintaining efficient system operation.

Keywords: AC/DC strong–weak balance; multidimensional assessment system; rationality evaluation model; structural optimization method (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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