Effects of transformer neutral grounding via small resistor on mitigating geomagnetically induced currents in power grid

被引：0
|
作者：
Yang P. [1 ]
Zheng X. [1 ]
Liu L. [2 ]
Liu C. [2 ]
Ma C. [2 ]
机构：
[1] School of Information Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia Autonomous Region
[2] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2017年 / 41卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Geomagnetic disturbance (GMD); Geomagnetically induced currents (GIC); Mitigation scheme; Neutral-point grounding via small resistor;
D O I：
10.13335/j.1000-3673.pst.2016.1372
中图分类号：
学科分类号：
摘要：
Geomagnetically induced currents (GIC) can cause half cycle saturation of transformers and adversely affect secure operation of power system, even resulting in large scale blackouts. To effectively mitigate GIC negative impacts in large-scale power system, a method is proposed to reduce power network GIC by placing small resistors in grounding neutral-point of transformers. Meanwhile, ten different configurations are presented for mitigating GIC considering characteristics of GIC interaction between 750kV and 330kV power grid in Gansu Province, China and geomagnetic storm in middle-low latitude regions. Four evaluation indexes used to assess GIC level are defined and ten above-mentioned configurations are evaluated. Result indicates difficulty of mitigating GIC in a 750kV/330kV dual voltage level power grid, especially for nodes with large GIC values. If configuration is unsuitable, effect of GIC mitigating measures could be adverse. GIC mitigation effect is better at 750kV substation than that at 330kV substation, and maximum GIC is reduced by 30% when the small resistors are placed in 750kV substations at power grid terminal. Research in this paper will provide support and basis for future researches in GIC mitigation in power grid. © 2017, Power System Technology Press. All right reserved.
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页码：1324 / 1331
页数：7
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