A Transient Multi-Feed-In Short Circuit Ratio-Based Framework for East China: Insights into Grid Adaptability to UHVDC Integration

Fan Li, Hengyi Li (), Yan Wang, Jishuo Qin and Peicheng Chen
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Fan Li: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Hengyi Li: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yan Wang: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Jishuo Qin: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Peicheng Chen: School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2025, vol. 18, issue 17, 1-20

Abstract: Amid escalating climate challenges, China’s carbon neutrality objectives necessitate energy electrification as a pivotal strategy. As a critical load hub, East China demonstrates significant trends toward cleaner energy—marked by growing renewable energy penetration and accelerated cross-regional direct current (DC) transmission deployment. Ensuring stable and efficient grid operation requires rigorous assessment of the impacts of ultra-high voltage DC (UHVDC) integration on grid stability. This study introduces the transient multi-feed-in short circuit ratio (TMSCR), a novel metric for evaluating new DC transmission systems’ influence on grid performance. We systematically investigate UHVDC integration within the East China power grid, emphasizing strategic DC landing point placement. Using TMSCR, the effects of diverse DC incorporation methods are analyzed. Furthermore, this research examines impacts of new DC connections on local and main grids, proposing targeted mitigation measures to enhance grid resilience. This comprehensive UHVDC impact analysis addresses a critical literature gap, providing actionable insights for East China power grid planning and establishing a foundation for subsequent grid planning and DC project feasibility studies during the ‘15th Five-Year Plan’ period.

Keywords: UHVDC transmission; power grid planning; grid stability; cross-regional transmission; transient multi-feed-in short circuit ratio (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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