【摘要】 基于WGS84坐标系统建立了地磁感应电流(GIC)的计算模型,在此基础上通过MATLAB-SIMULINK仿真软件搭建出含有GIC的电网模型。基于变压器的磁化曲线和铁芯饱和特性,研究了GIC作用下的变压器直流偏磁现象。通过对励磁电流、变压器磁链、线路电流的正常情况及GIC侵扰情况下的对比分析,结果表明,GIC作用下的变压器会发生直流偏磁,产生各次谐波,使线路电流发生一定程度的畸变。最后介绍了GIC对电网的主要影响,并从空间天气预警、变压器设计、电网规划3个方面阐述了GIC的防治措施。更多还原

【Abstract】 In this paper,a calculation model of GIC based on the WGS84 coordinate system,is established. On this basis,the power grid model of a power grid containing GIC is built with MATLAB-SIMULINK. Based on magnetization characteristic curve and core saturation characteristic,the paper studies the DC biasing magnetism phenomenon of the transformer under the effect of GIC. Through the comparative analysis of excitation current,transformer flux linkage and transmission line current under both the normal and GIC flowing conditions,it is suggested that the transformer under the effect of GIC has DC biasing magnetism, producing various harmonics to cause a certain degree of distortion of the line current. Finally,the main effects of GIC on the power grid are presented and mitigation strategies for prevention of GIC are expounded in terms of space weather warning,transformer design and power system planning.更多还原