Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent

Li Sun and Lingwei Kong ()
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Li Sun: Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, China
Lingwei Kong: Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, China

Energies, 2025, vol. 18, issue 10, 1-11

Abstract: The short-circuit ratio is a key index used to measure the voltage support capability of new energy grid-connected systems, which contradicts its accuracy and practicability. The current short-circuit ratio index (SCR-U) does not consider the influence of the coupling impedance between power supply and load on the short-circuit ratio in the calculation process. This paper derives the coupled short-circuit ratio (SCR-O) based on SCR-U and the coupled equivalent impedance. The coupled critical short-circuit ratio (CSCR-O) is then numerically obtained based on the maximum transmission power, and the extreme value of the critical short-circuit ratio is calculated to provide a numerical basis to determine the accuracy of SCR-U and SCR-O. Finally, simulations demonstrate the superiority of the coupling short circuit to the short-circuit ratio index. It can provide more accurate results and reflect the system’s real-time voltage stability.

Keywords: Thevenin equivalent; coupled short-circuit ratio; coupling critical short-circuit ratio; static voltage (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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