Research on Measures to Limit Short-Circuit Current by Changing the Structure of the Power Grid

Shuqin Sun, Guanghao Zhou, Yunting Song (), Xiaojun Tang, Yuguang Zhou and Zhenghai Yuan
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Shuqin Sun: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Guanghao Zhou: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
Yunting Song: China Electric Power Research Institute, Beijing 100192, China
Xiaojun Tang: China Electric Power Research Institute, Beijing 100192, China
Yuguang Zhou: Dandong Jinshan Thermal Power Co., Ltd., Dandong 118000, China
Zhenghai Yuan: College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China

Energies, 2025, vol. 18, issue 8, 1-28

Abstract: This paper addresses the increasingly severe issue of excessive short-circuit currents brought about by the rapid development of large power grids. The working principles of structural changes in the grid as a means of limiting currents are studied, and an impedance matrix is constructed using the additional branch method to analyze the control effects of these limiting measures on short-circuit currents. To explore how to control the level of short-circuit currents in large power grids, this paper provides a detailed analysis of the working principles, advantages, and disadvantages of eight grid structural change measures, including electromagnetic ring network breaking, bus splitting, line interruption, and line coupling. The applicable conditions for each short-circuit-current-limiting measure are established, and specific engineering simulation cases are used to verify their effectiveness in limiting short-circuit currents. The results indicate that this research plays a significant role in controlling short-circuit currents in power systems, maintaining the safe and stable operation of power systems, and improving the structure of power system networks.

Keywords: short-circuit current; impedance matrix; electromagnetic ring network breaking; bus splitting; applicable conditions (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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