Observations and modeling of GIC in the Chinese large-scale high-voltage power networks

Journal of Space Weather and Space Climate

Risto Pirjola³  Yunlong Li¹  Chunming Liu² 

[1] School of Electrical and Electronic Engineering, North China Electric Power University,Beijing,China;Geomagnetic Laboratory, Natural Resources Canada,Ottawa,Canada;Finnish Meteorological Institute,Helsinki,Finland

关键词: space weather;    engineering;    modelling;    geomagnetically induced currents (GIC);    electric circuit;   

Others  :  800611
DOI  :  doi:10.1051/swsc/2013057

 received in 2013-03-28, accepted in 2013-12-17,  发布年份 2014

【 摘 要 】

During geomagnetic storms, the geomagnetically induced currents (GIC) cause bias fluxes in transformers, resulting in half-cycle saturation. Severely distorted exciting currents, which contain significant amounts of harmonics, threaten the safe operation of equipment and even the whole power system. In this paper, we compare GIC data measured in transformer neutrals and magnetic recordings in China, and show that the GIC amplitudes can be quite large even in mid-low latitude areas. The GIC in the Chinese Northwest 750 kV Power Grid are modeled based on the plane wave assumption. The results show that GIC flowing in some transformers exceed 30 A/phase during strong geomagnetic storms. GIC are thus not only a high-latitude problem but networks in middle and low latitudes can be impacted as well, which needs careful attention.

【 授权许可】

   
© C. Liu et al., Published by EDP Sciences 2014

【 图 表 】

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