云南电网GIC的综合性评估指标

The Comprehensive GIC Evaluation Indices of Yunnan Power Grid

介绍因大电网的建设,中低纬地区的电网系统也会受到GIC的严重影响。本文以云南电网厂口、嵩明和新村6个变压器的中性点直流电流监测数据为依据,结合太阳风及地磁场的观测资料提出了三个综合性GIC评估指标,分别是太阳风能量注入函数、地磁场GIC指数和电网扰动能量增长率。同时还结合云南电网的实际情况具体分析了有可能引起各站点GIC幅度差异的关键因素,分析指出除输电线路的电压等级、长度、线路方向及变电站位置等因素外,变压器的结构也是决定GIC大小的关键因素之一。

With the development of the modern large-scale power grid, the power system in the mid- and low- latitude regions also encounter serious influences from GIC. On the basis of neutral point DC current monitoring at 6 transformers in Changkou, Songming and Xincun substations of Yunnan power grid, it is proposed three comprehensive GIC evaluation indices combined with the observation data of the solar wind and geomagnetic field in this paper, respectively, the solar wind energy input function, geomagnetic GIC index and electric network disturbance energy growth rate. At the same time, the key factors to determine the GIC amplitude is analyzed by considering the actual situation of Yunnan power grid. The results indicated that transformer structure should be one of the key factors of GIC in addition to the other factors, such as the voltage level, line length, direction of transmission lines and the substation location.