三华特高压电网地磁感应电流分析计算

Calculation of Geomagnetically Induced Currents in North China-central China-east China Power Grid

在相同感应地电场作用下,高电压等级输电线路的地磁感应电流(geomagnetically induced currents,GIC)比较大,交流特高压电网建设使我国电网增加了1 000 k V电压等级,综合考虑线路长度、单位阻值等GIC影响因素,准确计算我国1000k V特高压电网的GIC是重要研究课题。以我国三华特高压电网为例,只考虑1 000 k V电压等级网络,建立GIC模型,计算了东向及北向感应地电场情况下特高压电网变电站及输电线路的GIC。计算结果表明,我国特高压电网1 000 k V变电站中受GIC影响最大的变电站有锡盟,上海等特高压变电站;另外我国特高压电网输电线路中GIC规划计算数据偏大的有石家庄—济南线路和南阳—长治(晋东南)线路等,应引起电网公司对GIC灾害防治的重视。

Given a geoelectric field, the amplitudes of geomagnetically induced currents （GIC） high with high voltage-level transmission lines. Thus, the preceding study mainly concentrated on calculating GIC in the highest voltage-level system while ignoring other voltage-level systems. With the construction of UHV AC power grid, the1000 kV network is added in the China＇ s power system. Taking the length and unit resistance of transmission lineand other factors affecting GIC into consideration comprehensively, it is significant to accurately calculate the GICin 1000 kV （UHV） networks. Based on the North China-Central China-East China Power Grid, Only consider the1000 kV voltage level network, the establishment GIC model to calculate the east and north to the electric field in-duced circumstances under UHV grid substations and transmission lines GIC. The results show that our 1000 kVUHV power grid substation by substation GIC have the greatest impact Xi Meng, Shanghai and other UHV substa-tions, in addition UHV transmission lines in the grid computing data is too large GIC planning Shijiazhuang - Jinanline and Nanyang-Changzhi （southeastern） lines, etc. , should attract attention to GIC grid Corporation of disasterprevention.