提出了分析长距离输电系统电压对磁暴感应地电场大小、方向敏感性的方法.首先建立了变电站接地磁感应电流计算模型,指出了输电线路走向、接地点间的距离和接地点间的相对位置之间的关系.然后通过计算地磁感应电流所产生的变压器集群无功损耗,分析变压器无功需求对系统电压影响.最后建立了系统电压越限指标与磁暴感应地电场大小与方向的灵敏度模型.以西北750 kV系统为例,仿真分析了地电场幅值从1 V/km ～ 10 V/km、方向从正东(0°)到正西(180°)时750kV系统电压分布状况和电压越限指标,结果表明采用本文方法可以反映长距离输电系统节点电压对地电场大小及方向的敏感性.%The method for analysis of sensitivity between voltage of the long-distance transmission system and amplitude,orientation of geoelectric field due to magnetic storms is presented.Firstly,geomagnetic induced current (GIC) calculation model of substation is established,and the relationship between the orientation of transmission line,the distance between the grounding points and the relative position between them are pointed out.And then,by calculating transformer cluster reactive power demand due to GIC,the impact of the cluster demand for reactive power on power system voltage is examined.Finally,the system voltage-limit indicators,the size and direction of magnetic storms induction geoelectric field sensitivity model are established.Takeing Northwest 750kV system as an example,the 750kV system voltage sensitivity of geoelectric field with amplitude from 1V/km ～10V/km,direction (0°) from east to west (180°) are simulated and amtyzed,and the voltage-limit indicators is calcnlated.The results show that the method proposed can reflect actually the long-distance transmission system voltage sensitivity of the geoelectric field due magnetic storm.
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