基于视电阻率数据的电网地磁感应电流计算方法

Calculation method of power grid GIC based on apparent resistivity data

快速准确地计算地磁感应电流是利用电网调度预防地磁扰动(GMD)灾害的基础。基于大地电性结构模型利用有限元计算GMD地电场的方法,具有工作量大、耗时长的缺点,不能满足调度防灾的需求。提出对输电线路进行微元化处理,利用变异函数和滑动加权平均进行视电阻率估计,结合地磁台地磁场实测数据直接计算微元GMD地电场。仿真实验结果表明,与建立大范围大地电导率模型并采用有限元计算的方法相比,利用视电阻率计算GMD地电场的方法省略了复杂的大地建模过程,提高了计算精度,缩短了运算时间,可为电网调度防治GMD灾害提供基础算法。

Rapid and accurate calculation of GIC(Geomagnectically Induced Current)is the basis of using power grid scheduling to prevent GMD(GeoMagnetic Disturbance)disaster.The geoelectric structure modelbased GMD geoelectric field calculation method using finite element has the disadvantages of extensive workload and time-consuming,which cannot meet the requirements of disaster prevention.The transmission line is treated with micro elements,the apparent resistivity is estimated by using variation function and sliding weighted average method,and the GMD geoelectric field of micro element is calculated directly by combining the measured data of geomagnetic field at geomagnetic platform.Simulative results show that,compared with the method based on the establishment of large-range earth electrical conductivity model and finite element calculation,the proposed method can omit the complex modeling process of earth,improve the calculation accuracy,shorten the calculation time,and provide a basic algorithm for power grid dispatching to prevent GMD disasters.