Geomagnetically induced currents in a power grid of northeastern Spain
Geomagnetically induced currents in a power grid of northeastern Spain
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西班牙东北部电网中的地磁感应电流
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Elionor Roldán
中科院分区：
文献类型：
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作者：
J. Torta;L. Serrano;J. Regué;A. Sanchez;Elionor Roldán
本文利用埃布罗地磁台的地磁记录，采用平面波外电流源假设和均匀的地球电导率，预测了地磁活动对加泰罗尼亚（西班牙东北部）输电系统的影响。虽然该地区位于中纬度地区，但在上一个太阳活动周期中最大的地磁暴发生时对地电场的测定表明，其振幅高于南部非洲记录的振幅，据报告，南部非洲的一些大型输电系统的Transformer发生故障。建立了电网的直流网络模型，并以埃布罗的电场作为区域代理，计算了极端事件下电网中的地磁感应电流（GIC）。此外，在电网的一个Transformer中性点接地处测量了GIC，从而评估了模型的准确性。虽然协议是相当令人满意的，结果表明，需要更好地了解地面导电性结构。这是首次尝试研究和测量南欧电网中的GIC，该地区目前被认为具有低GIC风险。
Using the geomagnetic records of Ebro geomagnetic observatory and taking the plane wave assumption for the external current source and a homogeneous Earth conductivity, a prediction of the effects of the geomagnetic activity on the Catalonian (northeastern Spain) power transmission system has been developed. Although the area is located at midlatitudes, determination of the geoelectric field on the occasion of the largest geomagnetic storms during the last solar cycles indicates amplitudes that are higher than those recorded in southern Africa, where some transformer failures on large transmission systems have been reported. A DC network model of the grid has been constructed, and the geomagnetically induced current (GIC) flows in the power network have been calculated for such extreme events using the electric field at Ebro as a regional proxy. In addition, GICs have been measured at one transformer neutral earthing of the power grid, so that there the accuracy of the model has been assessed. Although the agreement is quite satisfactory, results indicate that better knowledge of the ground conductivity structure is needed. This represents the first attempt to study and measure GICs in southern European power grids, a region considered to have low GIC‐risk up to the present.