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  Extreme value analysis to assess the risk from Geomagnetically Induced Currents to individual transformers of the Spanish power grid

Marsal, S., Curto, J. J., Torta, J. M., Piña-Varas, M. P., Ledo, J. J., Canillas-Pérez, V., Martí, A., Marcuello, A. (2023): Extreme value analysis to assess the risk from Geomagnetically Induced Currents to individual transformers of the Spanish power grid, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1568

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018038 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018038_1
Genre: Conference Paper

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 Creators:
Marsal, Santiago1, Author
Curto, Juan José1, Author
Torta, Joan Miquel1, Author
Piña-Varas, Maria Perla1, Author
Ledo, Juan José1, Author
Canillas-Pérez, Victoria1, Author
Martí, Anna1, Author
Marcuello, Alejandro1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Geomagnetically induced currents (GIC), ultimately due to disturbed conditions in the Earth’s space environment caused by Space Weather, affect power transmission grid transformers differently depending on latitude, ground conductivity, transformer type and grid topology. We evaluate the risk from GIC threat to transformers as a product of hazard and vulnerability. Hazard evaluates the probability of occurrence of geoelectric fields, which in turn depends on the primary currents flowing above the site in question, as well as on the local subsurface conductivity. On the other hand, the vulnerability of transformers depends on their winding resistances and on the network topology, which will favor GIC flow for certain orientations of the regional geoelectric field. Given that the period of available data is finite, and that it is precisely the large GICs that cause the most damage, an adequate risk assessment requires extreme value analysis techniques to obtain a continuous and reliable probability function for extreme GIC events. The method is exemplified with the case of one of the most vulnerable transformers of the Spanish power grid using magnetic observatory records of the period 2000 – 2021 and a ground conductivity model for the Iberian Peninsula.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1568
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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