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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 geomagnetic induced current (GIC) of the power grid is affected by many factors and has a complicated mechanism. Calculating the GIC of a 500 kV power grid with an ordinary transformer as the main power source, usually ignoring the GIC of 220 kv and below. The 750,1000 kVA The power grid generally adopts single-phase autotransformer, and the primary and secondary sides of the transformer have direct electrical connection. Studying the interaction characteristics and influencing factors of original secondary grid GIC is of great significance for studying the interference effects of transformers, assessing the risk of geomagnetic storm disasters and managing GIC In this paper, taking the 750 and 330 kV power grids in Gansu, China and the 1000 and 500 kV power grids under construction as examples, the international “GIC-Benchmark” standard introduced in 2012 is used to consider whether to ignore or not to ignore Transformer secondary grid GIC, the GIC model of main grid and UHV and 500 kV grid in Gansu was established, and the GIC model corresponding to the main grid and UHV under the geomagnetic storm from November 9 to November 9, 2004 was calculated kV grid.Analysis and comparison of the interaction and influence of grid GIC under various conditions, the interaction characteristics of two kinds of voltage grid GIC, and the secondary grid GIC 750kV and 750kV transformer GIC Contribution. Greek Looking forward to provide scientific and technical support for accurate calculation of power grid GIC, risk assessment of geomagnetic storm disasters and power grid GIC governance.