摘要
电网地磁感应电流（GIC）影响因素多、机制复杂.计算普通变压器为主的500 k V电网的GIC,通常忽略220 k V及以下电网的GIC.中国2005和2009年开始建设的750,1000k V电网普遍采用单相自耦变,变压器原副边有直接电气联系,研究原副边电网GIC的相互作用特征和影响因素,对研究变压器干扰效应、评估地磁暴灾害风险和治理电网GIC具有重要意义.本文以中国甘肃750与330 k V电网和建成及在建1000与500 k V电网为例,运用国际上2012年新推出的＂GIC-Benchmark＂标准算例,分别考虑忽略和不忽略变压器副边电网GIC的影响,建立了甘肃主网和特高压及500 k V电网的GIC模型,计算了相当于2004年11月9~10日地磁暴作用下的甘肃主网和特高压及500 k V电网的GIC水平.比较分析了各种情况下电网GIC的相互作用及影响,探明了两种电压等级电网GIC的相互作用特征,以及副边电网GIC对750和1000 k V变压器GIC的贡献.希望为电网GIC准确计算、地磁暴灾害风险评估及电网GIC治理提供科技支撑.
The mechanism of GIC（Geomagnetically Induced Current） is complex, which is influenced by a number of factors. In previous studies, when calculating GIC in a 500 k V power network, the 220 k V part of the network and voltage levels below are usually ignored. China launched the construction of 750 k V in 2005, and 1000 k V network in 2009. Such power networks consists of a large proportion of autotransformers, which enable direct electrical connection between the primary and secondary windings. Therefore, it is of great importance to study the GIC interaction between windings and the relative factors. We established GIC models according to the 750 and 330 k V power network as well as the 1000 k V and 500 k V network in Gansu province in China, using GIC Benchmark which is a standard testing case proposed in 2012. In our models, we adopted different scenarios where we chose to include or ignore the GIC from secondary windings. We calculated the GIC level in Gansu main network, 1000 k V and 500 k V networks under the geomagnetic storm in November 9 and 10, 2004. Comparative analysis was made between different scenarios to showcase the GIC interaction and its influence. Results revealed the characteristics of GIC interaction between two voltage levels, as well as GIC contribution from secondary windings in 750 and 1000 k V autotransformers, which will provide support to future researches in GIC calculation, risk evaluation of geomagnetic storms and GIC suppression in the power network.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2015年第12期1311-1320,共10页
Scientia Sinica(Technologica)
基金
国家高技术研究发展计划(批准号:2012AA121005)
国家自然科学基金(批准号:51577060
51177045)
和科技部国际合作计划(批准号:2010DFA04680)资助项目
关键词
地磁暴
地磁感应电流
双电压等级电网
全节点模型
相互作用
geomagnetic storm
geomagnetically induced current
dual-voltage-level power system
full-node model
interaction
