An Overview of Modeling Geomagnetic Disturbances in Power Systems

GICs in technological conductor networks are a ground manifestation of space weather. During severe geomagnetic storms, if GICs flow in power systems, real and reactive power flow will swing abnormally, also transformer saturation, over-voltage fluctuation, frequency shift, unnecessary relay trippings and increased harmonic contents, even damage of transformer or a collapse of the whole system may occur. So GIC controlling in power systems is so significant that it can help power systems stand through strong geomagnetic disturbances, as well as ensure safe and stable operation of power systems. In this paper, control methods and techniques on GIC in power systems have been summarized in reference of research achievements and control experience on GIC.

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Reaction of Power Systems to Geomagnetic Disturbances

Geomagnetic Disturbances Impacts on Power Systems ◽

10.1201/9781003134152-4 ◽

2021 ◽

pp. 81-120

Author(s):

Olga Sokolova ◽

Nikolay Korovkin ◽

Masashi Hayakawa

Keyword(s):

Power Systems ◽

Geomagnetic Disturbances

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

Mathematical Problems in Engineering ◽

10.1155/2015/761964 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Bo Dong ◽

Zezhong Wang ◽

Risto Pirjola ◽

Chunming Liu ◽

Lianguang Liu

Keyword(s):

Power Systems ◽

Electric Fields ◽

Three Dimensional ◽

Geoelectric Field ◽

Geomagnetically Induced Currents ◽

Geomagnetic Disturbances ◽

Planar Grid ◽

Induced Currents ◽

Telluric Currents ◽

Earth Conductivity

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.

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Assessment of the Impact of Geomagnetic Disturbances on Korean Electric Power Systems

Energies ◽

10.3390/en11071920 ◽

2018 ◽

Vol 11 (7) ◽

pp. 1920 ◽

Cited By ~ 2

Author(s):

Byoung-Soo Joo ◽

Jung-Wook Woo ◽

Jeong-Hun Lee ◽

Injoo Jeong ◽

Jungmin Ha ◽

...

Keyword(s):

Power Systems ◽

Power System ◽

Electric Power ◽

Reactive Power ◽

Electric Power Systems ◽

Geomagnetic Disturbance ◽

Electric Power System ◽

System Stability ◽

Geomagnetic Disturbances ◽

The Impact

Geomagnetic disturbances have the potential to impact the operation of electric power systems, and thus the assessment of their impacts is required as the first step for secure power system operations. While the effects of the disturbances have been observed primarily at higher latitudes, geomagnetic problems are also observed at mid and low latitude locations, in particular including neighboring countries to Korea such as China and Japan. This paper deals with the assessment of impact of geomagnetic disturbances on Korean electric power systems. For the assessment, the geoelectric fields induced by the geomagnetic disturbances are calculated using geomagnetic data measured over the past 20 years in order to quantify the strength of geomagnetic events in Korea. Then, the geomagnetic currents on the grid driven by the geoelectric fields are computed. Finally, the increased reactive power absorption in high voltage transformers is analyzed and accordingly the change of system voltage magnitudes is identified to evaluate whether the system maintains the voltage stability. The systematic study concludes that during a strong geomagnetic disturbance, the Korean electric power system satisfies the associated standards in the U.S. and maintains system stability.

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