Improved Model for GIC Calculation in the Mexican Power Grid
Por:
Caraballo, R., Gonzalez-Esparza, J. A., Pacheco, C. R., Corona-Romero, P.
Publicada:
1 oct 2023
Categoría:
Atmospheric science
Resumen:
We present the first observations of geomagnetically induced currents
(GIC) in the Mexican power grid and an improved model to calculate them.
The new model comprises ca. 250 substations working at various voltage
levels, a methodology to estimate geomagnetic disturbances (delta B) at
different points throughout the Mexican territory, and a 1D piecewise
model that considers lateral variations in the ground conductivity. This
is an improvement of a former uniform conductivity model presented
previously to calculate our first GIC estimates (Caraballo et al.,
2020). We compared the observed and calculated GIC between August and
November 2021 at a coastal 400 kV substation. During this interval, five
geomagnetic storms occurred (G1 and G2). The observed GIC exceeded 10 A
during the most strong event; this shows a clear grid response even
under weak geomagnetic perturbations that occurred during the solar
minimum. Further comparison with the results of the former model
suggests that the new 1D piecewise model yields better GIC estimates for
the Mexican power grid.
Filiaciones:
Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Morelia, Mexico
SCiESMEX, LANCE, Instituto de Geofísica, Unidad Michoacan, Universidad Nacional Autónoma de México, Morelia, Mexico
Gerencia de Ingeniería Especializada, Comisión Federal de Electricidad, Mexico City, Mexico
CONACYT, Instituto de Geofísica, Unidad Michoacan, Universidad Nacional Autónoma de México, Morelia, Mexico
hybrid, All Open Access; Hybrid Gold
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