基于分层大地电导率模型的电网GIC算法研究
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摘要
磁暴在电网感应的地磁感应电流(Geomagnetically Induced Current,简称GIC)与磁暴强度、大地构造和电网结构等因素有关,不同深度大地电导率的差异对GIC影响很大。根据电网GIC产生过程,建立了基于分层大地波阻抗的构造模型,推导了地面波阻抗的迭代公式和地电场与地磁场的关系式,得到了基于平面波理论的大地感应电场算法,给出了该算法的实现过程和电网GIC的计算流程。根据2006年12月磁暴数据,计算了阳-淮输电系统的GIC水平。计算结果与实测数据对比表明,模型和算法是有效的,并且有精度高、计算简单等优点。
Geomagnetically Induced Current(GIC) induced in the power grid during magnetic storm is closely related to magnetic storm intensity,earth structure and network topology.Different conductivities at different depths have great influences on the GIC calculation.Based on the process of GIC generation,this paper models the layered-earth impedance and derives iterative formula of earth's surface impedance and the relationship formula between earth electric field and earth magnetic field.It also obtains the algorithm based on the plane wave method and gives the realization course of the algorithm and the calculation process of the GIC.Comparing the results calculated from the Yang-Huai transmission system based on the magnetic storm data of September 2006 with the actually measured data,researchers may conclude that that the model and algorithm are valid,high in precision and simple in calculation.
Geomagnetically Induced Current(GIC) induced in the power grid during magnetic storm is closely related to magnetic storm intensity,earth structure and network topology.Different conductivities at different depths have great influences on the GIC calculation.Based on the process of GIC generation,this paper models the layered-earth impedance and derives iterative formula of earth's surface impedance and the relationship formula between earth electric field and earth magnetic field.It also obtains the algorithm based on the plane wave method and gives the realization course of the algorithm and the calculation process of the GIC.Comparing the results calculated from the Yang-Huai transmission system based on the magnetic storm data of September 2006 with the actually measured data,researchers may conclude that that the model and algorithm are valid,high in precision and simple in calculation.
引文
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[2]袁建刚,朱永利.基于分层模型配电网结构知识表示的拓扑分析方法[J].南方电网技术,2009,3(6):95-99.
[3]KAPPENMAN J G,Albertson VD.Bracing for GeomagneticStorms[J].IEEE Spectrum,1990,3(3):27-33.
[4]张洪兰,彭晨光,刘连光.GIC作用下的变压器励磁电流及无功功率特性[J].电网与清洁能源,2010,26(2):13-17.
[5]刘林玉,谢学武.500 kV主变压器异常声音分析[J].高电压技术,2005,31(4):85-87.
[6]刘连光,刘宗岐,张建华.地磁感应电流对我国电网影响的初步分析[J].中国电力,2004,37(11):10-14.
[7]刘连光.磁暴对中国电网的影响[J].电网与清洁能源,2008,24(5):1-6.
[8]PINTO L M,SZCZUPAK J,DRUMMOND M A,et al.A NewThreat to Power Systems Security[C]//IEEE/PES Transmission&Distribution Conference&Exposition:November 8th-11th,2004,Latin America:776-781.
[9]中国地震局监测预报司.地震电磁数字观测技术[M].北京:地震出版社,2002.
[10]李东华.地质学基础[M].煤炭工业出版社,2006.
[11]马丽芳.中国地质图集[M].北京:地质出版社,2009.
[12]国家地震局地学断面编委会.江苏响水至内蒙满都拉地学断面[M].北京:地震出版社,1991.
[13]国家地震局地学断面编委会.上海奉贤-内蒙阿拉善地学断面[M].北京:地震出版社,1992.
[14]魏文博.我国大地电磁测深新进展及瞻望[J].地球物理学进展,2002,17(2):245-254.
[15]马晓冰,Ian J Ferguso,等.地磁感应电流(GIC)的作用与评估[J].地球物理学报,2005,48(6):1282-1286.
[16]VILJANEN A.Relation of Geomagnetically InducedCurrents and Local Geomagnetic Variations[J].IEEETransactions on Power Delivery,1998,13(4):1285-1290.
[17]VILJANEN A,PULKKINEN A,AMM O,et al.FastComputation of the Geoelectric Field Using the Method ofElementary Current Systems and Planar Earth Models[M].Annales Geophysicae,2004,22(1):101-113.
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