变压器中性点配置小电阻器对治理电网GIC的效果分析

发布时间：2018-04-15 21:43

本文选题：地磁扰动 + 地磁感应电流　；参考：《电网技术》2017年04期

【摘要】：地磁感应电流(geomagnetically induced currents,GIC)引起变压器半波饱和对电力系统的安全运行产生不利影响,甚至引发大面积停电事故。为了有效治理GIC对大规模电力系统的不良影响,提出变压器中性点配置小电阻器减轻电网GIC的解决思路,同时结合甘肃省750/330kV电网GIC相互作用及中低纬地区地磁暴的特点,给出10种不同的组合治理方案。制定了评价电网GIC水平的4个指标,并对上述10种方案的治理效果进行了评估。结果表明750/330k V双电压等级电网GIC治理难度较大,特别是GIC高风险节点的抑制,配置不当会使治理效果恶化,同时,750kV变电站中性点配置小电阻器抑制GIC较330kV变电站的作用大,且在电网末端750kV变电站配置小电阻器抑制电网GIC的效果较明显,可使GIC的最大值降低30%。研究结果希望为电网GIC治理提供理论基础和技术支撑。
[Abstract]:Geomagnetic induced current (geomagnetically induced currents) caused by transformer half-wave saturation has a negative impact on the safe operation of power system, and even causes a large-scale blackout accident.In order to effectively control the bad influence of GIC on large-scale power system, a solution to reduce the GIC of power network with small resistors at neutral point of transformer is put forward. At the same time, combining with the GIC interaction of 750/330kV power grid in Gansu Province and the characteristics of geomagnetic storm in middle and low latitude area, the solution is proposed.Ten different combined governance schemes are given.Four indexes to evaluate the GIC level of power grid are established, and the governance effects of the above 10 schemes are evaluated.The results show that it is difficult to treat GIC in 750 / 330kV double-voltage power grid, especially the suppression of high risk nodes of GIC, and improper configuration will worsen the effect of governance. At the same time, the neutral-point placement of small resistors in 750kV substations is more effective than that of 330kV substations.At the end of the network, the small resistor in the 750kV substation has obvious effect on restraining GIC, which can reduce the maximum value of GIC by 30%.The research results hope to provide theoretical basis and technical support for grid GIC governance.
【作者单位】：内蒙古科技大学信息工程学院;新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(51577060) 国家863高技术基金项目(2012AA121005)~~
【分类号】：TM41;TM732

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