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与北欧、北美国家相比,我国大陆的磁纬低,同次地磁暴的地磁扰动(geomagnetic disturbance,GMD)相对较弱,对计算中低纬GMD地电场和电网GIC提出了更高的要求。为研究海岸效应对中低纬GMD地电场和电网地磁感应电流(geomagnetically induced current,GIC)的影响,以2004年11月9日地磁暴广东肇庆地磁台的GMD秒钟数据和广东沿海地区的大地构造资料为基础,建立了岭澳核电站沿海局部地区的一维和三维大地电导率模型,计算了GMD的地电场和岭澳核电站变压器中性点的GIC。结果表明,海岸效应对电网GIC的影响很大,在评估中低纬沿海电力系统的GIC灾害风险时,应充分考虑海岸效应的作用,以及使用地磁暴的秒钟GMD数据,能够获得更准确的计算结果。
Compared with the countries in North Europe and North America, the magnetic latitudes of China are low and the geomagnetic disturbance (GMD) of the same geomagnetic storm is relatively weaker, which puts forward higher requirements for calculating the geoelectric field and grid GIC of middle and low latitudes. In order to study the effect of coast effect on the geomagnetically induced current (GIC) at low and medium latitudes and in geomagnetically induced current (GIC), based on the GMD seconds data of geomagnetic observatories in Zhaoqing, Guangdong Province, on November 9, 2004, Based on the tectonic data, the one-dimensional and three-dimensional geoconductivity models for some areas along the coast of Ling Ao Nuclear Power Station have been established. The geoelectric field of GMD and the GIC of transformer neutral point of Ling’ao Nuclear Power Station have been calculated. The results show that the coast effect has a great influence on the GIC of the power grid. When assessing the GIC disaster risk of the coastal power system in the middle and low latitudes, the coast effect should be fully considered and the second GMD data of the geomagnetic storm can be used to obtain a more accurate Calculation results.