Study on Variation Rate Characters of Mid-to-Low Latitude Area Geomagnetic Field during Geomagnetic Storms

Abstract:

Geomagnetic field changes acutely during geomagnetic storms. According to Faraday's law of electromagnetic induction, the change of the geomagnetic field produces geomagnetically induced current (GIC) in power grid, which directly damages the power equipment and threatens safe operation of power grid. The more dramatically geomagnetic field changes, the bigger geomagnetically induced current in power grid becomes, and thus, the greater harm it brings to power grid. In this paper, based on the H and D components of recent geomagnetic storm data measured by several mid-to-low latitude geomagnetic observatories, the variation law of the amplitude of north-south and east-west geomagnetic component change rate (dX/dt and dY/dt) pulse with geomagnetic latitude was analyzed when geomagnetic field changed very severely. Finally, the possibilities of power grid in different direction affected by GIC with the change of latitude were discussed. The analysis results will contribute to the evaluation, measurement and control of GIC in Chinese current and future power grid.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 2125-2131
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.2125
• Online since: October 2013
• Authors: Xiao Mao Wang
• Keywords: Geomagnetically Induced Currents, Magnetic Storm, Mid-to-Low Latitude Power Grid, Variation Rate of Geomagnetic Field

References

[1] M. A. S. Masoum, P. S. Moses. Impact of balanced and unbalanced direct current bias on harmonic distortion generated by asymmetric three-phase three-leg transformers[J]. IET Electric Power Applications, 2010, 4(7): 507-515.

DOI: 10.1049/iet-epa.2009.0311

[2] Kappenman J G. An overview of the impulsive geomagnetic field disturbances and power grid impacts associated with the violent sun-earth connection events of 29-31 October 2003 and a comparative evaluation with other contemporary storms [J]. Space Weather, 2005, 3(1): 21-28.

DOI: 10.1029/2004sw000128

[3] Pinto L M, Szczupak J, Drummond M A, et al. A New Threat to Power Systems Security[C]. Transmission & Distribution Conference & Exposition, Latin America: IEEE/PES, 2004: 776-781.

DOI: 10.1109/tdc.2004.1432480

[4] Liu Chunming. Mid-low Latitude Power Grid Geomagnetically Induced Currents and its Assessing Method [D]. Beijing: North China Electric Power University, 2009. 19-20.

[5] M. Wik, A, Viljanen, R Pirjola, A, Pulkkinen, et al. Calculation of geomagnetically induced currents in the 400 kV power grid in southern Sweden. Space Weather, 2008, 6(7), S07005, doi: 10. 1029/2007SW000343, 11.

DOI: 10.1029/2007sw000343

[6] Gaunt C T, Coetzee G. Transformer failures in regions incorrectly considered to have low GIC-risk[C]. Power Tech, 2007 IEEE Lausanne, 807-812.

DOI: 10.1109/pct.2007.4538419

[7] KuaiDizheng, Liu Chengmin, Wan Da. Jiangsu Electrical Engineering, 2004, 23(3): 1-5.

[8] Liu Lianguang, Liu Zongqi, hang Jianhua. Electric Power, 2004, 37(11): 10-14.