Methodology for simulation of geomagnetically induced currents in power systems

Journal of Space Weather and Space Climate

David Boteler¹ 

[1] Geomagnetic Laboratory, Natural Resources,Ottawa,Canada

关键词: methodology;    electromagnetism;    modelling;    electric field;    geomagnetically induced currents (GIC);   

Others  :  815354
DOI  :  doi:10.1051/swsc/2014018

 received in 2013-04-23, accepted in 2014-05-19,  发布年份 2014

【 摘 要 】

To assess the geomagnetic hazard to power systems it is useful to be able to simulate the geomagnetically induced currents (GIC) that are produced during major geomagnetic disturbances. This paper examines the methodology used in power system analysis and shows how it can be applied to modelling GIC. Electric fields in the area of the power network are used to determine the voltage sources or equivalent current sources in the transmission lines. The power network can be described by a mesh impedance matrix which is combined with the voltage sources to calculate the GIC in each loop. Alternatively the power network can be described by a nodal admittance matrix which is combined with the sum of current sources into each node to calculate the nodal voltages which are then used to calculate the GIC in the transmission lines and GIC flowing to ground at each substation. Practical calculations can be made by superposition of results calculated separately for northward and eastward electric fields. This can be done using magnetic data from a single observatory to calculate an electric field that is a uniform approximation of the field over the area of the power system. It is also shown how the superposition of results can be extended to use data from two observatories: approximating the electric field by a linear variation between the two observatory locations. These calculations provide an efficient method for simulating the GIC that would be produced by historically significant geomagnetic storm events.

【 授权许可】

   
© D. Boteler, Published by EDP Sciences 2014

【 图 表 】

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