多直流接地系统单极运行对沪西特高压变电站直流偏磁的影响

发布时间：2018-03-19 20:32

本文选题：特高压交流变电站　切入点：直流偏磁　出处：《电网技术》2014年01期 　论文类型：期刊论文

【摘要】：研究了上海周边7条超高压与特高压直流系统中有条或多条线路单极运行时,上海沪西等特高压变电站和上海500 kV电网的直流偏磁情况。电磁仿真计算各交流变电站的地电位分布与中性点偏磁电流,结果表明:多条直流线路单极运行时条线路上的电流不会通过其他线路回流,特高压变电站的直流电流在多条线路同时单极运行时的数值等于单条线路单极运行时的代数和,向家坝—上海、锦屏—苏南、三峡—上海这3条线路单极运行时对沪西变电站的影响大,使特高压变压器中性点偏磁电流超过5 A,约2.4?的变压器中性点串联电阻可较好地抑制沪西特高压变电站的直流偏磁电流。
[Abstract]:In this paper, the unipolar operation of seven UHV and UHV DC systems around Shanghai is studied. The DC magnetic bias of UHV substations and 500 kV power grids in Shanghai, Shanghai, Shanghai, and so on. Electromagnetic simulation is used to calculate the ground potential distribution and neutral bias current of each AC substation. The results show that the current on multiple DC lines is not reflux through other lines when unipolar operation, and the value of DC current in UHV substation is equal to the algebraic sum when unipolar operation of single line is achieved at the same time. Xiangjiaba-Shanghai, Jinping-Sunan, three Gorges-Shanghai-the three Gorges-Shanghai single pole operation of the three lines on the Huxi substation, so that the UHV transformer neutral point bias magnetic current more than 5 A, about 2.4? The transformer neutral point series resistance can restrain DC bias current of UHV substation.
【作者单位】：电力传输与功率变换控制教育部重点实验室(上海交通大学);上海市电力公司上海电力科学研究院;
【基金】：国家电网公司皖电东送工程单项研究专题—超、特高压直流输电系统的运行对特高压交流系统的影响研究~~
【分类号】：TM862;TM63

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