volume | PIER Journals

Abstract

For assessing Geomagnetically Induced Currents (GICs) risks in mid-latitude coastal power grids, this study developed a three-dimensional Earth conductivity model that incorporates coastal effects. The model was constructed using geological cross-sectional data from the China Earthquake Administration and measured terrestrial conductivity data. Focusing on the strong geomagnetic storm of February 27, 2023, the spatiotemporal characteristics of GICs in Shandong Peninsula across 34 substations and 46 transmission lines were accurately computed. The GICs peak of the substation appears at Muping , and the GICs peak of the transmission line appears at Zouxian-Luzhou Line. Notably, two coastal substations exceeded the safety limit for GICs. Areas of highest risk are concentrated in the southeastern coastal region of Shandong, underscoring the significant impact of coastal effects and changes in Geological Structure. This method and its findings provide a global reference for predicting and issuing early warnings regarding GICs in long-distance mid-latitude coastal power grids.

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Dr. Xiaofeng Zhou

Dr. Xinwei Zhang

Mr. Xiaolong Li

Dr. Jia Cao

Dr. Tao Li

Dr. Yanling Wang