Study of effects of changes of earthing resistances on geomagnetically induced currents in an electric power transmission system

Radio Science ◽  
2008 ◽  
Vol 43 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Risto Pirjola
Keyword(s):  
Electric Power ◽  
Power Transmission ◽  
Transmission System ◽  
Geomagnetically Induced Currents ◽  
Power Transmission System ◽  
Induced Currents

scholarly journals Geomagnetically induced currents in an electric power transmission system at low latitudes in Brazil: A case study

Space Weather ◽  
2007 ◽  
Vol 5 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Nalin B. Trivedi ◽  
Ícaro Vitorello ◽  
Wanderli Kabata ◽  
Severino L. G. Dutra ◽  
Antonio L. Padilha ◽  
...  
Keyword(s):  
Electric Power ◽  
Power Transmission ◽  
Transmission System ◽  
Geomagnetically Induced Currents ◽  
Power Transmission System ◽  
Low Latitudes ◽  
Induced Currents

scholarly journals North Europe power transmission system vulnerability during extreme space weather

2018 ◽  
Vol 8 ◽  
pp. A03 ◽  
Author(s):  
Roberta Piccinelli ◽  
Elisabeth Krausmann
Keyword(s):  
Space Weather ◽  
Power Transmission ◽  
Geomagnetic Storms ◽  
Extreme Event ◽  
Transmission System ◽  
Mitigation Measures ◽  
Geomagnetically Induced Currents ◽  
Power Transmission System ◽  
Induced Currents ◽  
The Impact

Space weather driven by solar activity can induce geomagnetic disturbances at the Earth's surface that can affect power transmission systems. Variations in the geomagnetic field result in geomagnetically induced currents that can enter the system through its grounding connections, saturate transformers and lead to system instability and possibly collapse. This study analyzes the impact of extreme space weather on the northern part of the European power transmission grid for different transformer designs to understand its vulnerability in case of an extreme event. The behavior of the system was analyzed in its operational mode during a severe geomagnetic storm, and mitigation measures, like line compensation, were also considered. These measures change the topology of the system, thus varying the path of geomagnetically induced currents and inducing a local imbalance in the voltage stability superimposed on the grid operational flow. Our analysis shows that the North European power transmission system is fairly robust against extreme space weather events. When considering transformers more vulnerable to geomagnetic storms, only few episodes of instability were found in correspondence with an existing voltage instability due to the underlying system load. The presence of mitigation measures limited the areas of the network in which bus voltage instabilities arise with respect to the system in which mitigation measures are absent.

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