Modeling Geomagnetically Induced Currents in Australian Power Networks Using Different Conductivity Models
Space weather manifests in power networks as quasi‐DC currents flowing in and out of the power system through the grounded neutrals of high‐voltage transformers, referred to as geomagnetically induced currents. This paper presents a comparison of modeled geomagnetically induced currents, determined using geoelectric fields derived from four different impedance models employing different conductivity structures, with geomagnetically induced current measurements from within the power system of the eastern states of Australia. The four different impedance models are a uniform conductivity model (UC), one‐dimensional n‐layered conductivity models (NU and NW), and a three‐dimensional conductivity model of the Australian region (3DM) from which magnetotelluric impedance tensors are calculated. The modeled 3DM tensors show good agreement with measured magnetotelluric tensors obtained from recently released data from the Australian Lithospheric Architecture Magnetotelluric Project. The four different impedance models are applied to a network model for four geomagnetic storms of solar cycle 24 and compared with observations from up to eight different locations within the network. The models are assessed using several statistical performance parameters. For correlation values greater than 0.8 and amplitude scale factors less than 2, the 3DM model performs better than the simpler conductivity models. When considering the model performance parameter, P, the highest individual P value was for the 3DM model. The implications of the results are discussed in terms of the underlying geological structures and the power network electrical parameters.
<b>Citation:</b> Marshall, R. A., Wang, L., Paskos, G. A., Olivares‐Pulido, G., Van Der Walt, T., Ong, C., et al. (2019). Modeling geomagnetically induced currents in Australian power networks using different conductivity models. <i>Space Weather</i>, 17.
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- 2022-04-28
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- 2024-02-08T03:58:16
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/146524
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Role Organisation / Individual Name Details Point of contact Marshall, R.A.
External Contact Author Wang, L.
Place and Communities Internal Contact Author Paskos, G.A.
External Contact Author Olivares-Pulido, G.
External Contact Author van der Walt, T.
External Contact Author Ong, C.
External Contact Author Mikkelsen, D..
External Contact Author Hesse, G.
External Contact Author McMahon, B.
External Contact Author Van Wyk, E.
External Contact Author Ivanovich, G.
External Contact Author Spoor, D.
External Contact Author Taylor, C.
External Contact Author Yoshikawa, A.
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Space Weather
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Volume 17, Issue 5, May 2019,
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727-756
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Article for submission to the Space Weather Journal
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
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EARTH SCIENCES
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geomagnetic induced currents
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geoelectric fields
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conductivity models
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© 2019 Australian Bureau of Meteorology, Commonwealth of Australia.
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ISO 19115-1:2014
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