Geomagnetically Induced Current ( GIC) induced in the power grid during magnetic storm is closely related to magnetic stonn intensity, earth structure and network topology. Different conductivities at different depths have great influences on the CIC calculation. Based on the pmceas of GlC generation this paper models the layered -earth impedance and derives iterative formula of earth ' s sudace impedance and the relationship formula between earth electric field and earth magnetic field It also obtains the algorithm based on the plane wave method and gives the realization course of the algorithm and the calculation process of the GIC. Comparing the results calculated from the Yang-Huai transmission system based on the magnetic storm data of September 2006 with the actually measured data, researchers may conclude that that the model and algorithm are valid high in precision and simple in calculation.%磁暴在电网感应的地磁感应电流(Geomagnetically Induced Current,简称GIC)与磁暴强度、大地构造和电网结构等因素有关,不同深度大地电导率的差异对GIC影响很大.根据电网GIC产生过程,建立了基于分层大地波阻抗的构造模型,推导了地面波阻抗的迭代公式和地电场与地磁场的关系式,得到了基于平面波理论的大地感应电场算法,给出了该算法的实现过程和电网GIC的计算流程.根据2006年12月磁暴数据,计算了阳-淮输电系统的GIC水平.计算结果与实测数据对比表明,模型和算法是有效的,并且有精度高、计算简单等优点.
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