An Approach to Model Earth Conductivity Structures with Lateral Changes for Calculating Induced Currents and Geoelectric Fields during Geomagnetic DisturbancesReportar como inadecuado




An Approach to Model Earth Conductivity Structures with Lateral Changes for Calculating Induced Currents and Geoelectric Fields during Geomagnetic Disturbances - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Mathematical Problems in Engineering - Volume 2015 2015, Article ID 761964, 10 pages -

Research Article

Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing 102206, China

Finnish Meteorological Institute, 00101 Helsinki, Finland

Natural Resources Canada, Ottawa, ON, Canada K1A 0Y3

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China

Received 30 August 2014; Revised 22 January 2015; Accepted 22 January 2015

Academic Editor: Hari M. Srivastava

Copyright © 2015 Bo Dong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

During geomagnetic disturbances, the telluric currents which are driven by the induced electric fields will flow in conductive Earth. An approach to model the Earth conductivity structures with lateral conductivity changes for calculating geoelectric fields is presented in this paper. Numerical results, which are obtained by the Finite Element Method FEM with a planar grid in two-dimensional modelling and a solid grid in three-dimensional modelling, are compared, and the flow of induced telluric currents in different conductivity regions is demonstrated. Then a three-dimensional conductivity structure is modelled and the induced currents in different depths and the geoelectric field at the Earth’s surface are shown. The geovoltages by integrating the geoelectric field along specific paths can be obtained, which are very important regarding calculations of geomagnetically induced currents GIC in ground-based technical networks, such as power systems.





Autor: Bo Dong, Zezhong Wang, Risto Pirjola, Chunming Liu, and Lianguang Liu

Fuente: https://www.hindawi.com/



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