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直流大地运行时交流系统直流电流分布的预测方法
引用本文:张波,赵杰,曾嵘,何金良,崔翔.直流大地运行时交流系统直流电流分布的预测方法[J].中国电机工程学报,2006,26(13):84-88.
作者姓名:张波  赵杰  曾嵘  何金良  崔翔
作者单位:1. 清华大学电机系电力系统国家重点实验室,北京市,海淀区,100084
2. 南方电网技术研究中心,广东省,广州市,510620
3. 华北电力大学电力系,河北省,保定市,071003
摘    要:直流输电线路在系统调试或发生故障情况下,会处于单极大地回路电流运行方式。当直流输电系统的大地回流很大时,可能造成部分交流输电系统中的变压器处于偏磁状态。该文提出了分析直流大地运行时交流系统直流电流分布的数值方法。该方法使用矩量法分析复杂大地结构中由直流接地极、交流变电站接地网及其它埋地金属管道构成的多接地系统所产生的地中电流场。同时将电路理论与矩量法相结合,从而将多接地系统与地上交流输电网络联系起来。分析了贵广直流输电线路以大地为回路运行时,直流电流在广东春城变电站周围220kV及以上电网的分布,并与现场测试结果作了比较。

关 键 词:电流分布  接地极  直流输电  直流偏磁
文章编号:0258-8013(2006)13-0084-05
收稿时间:2006-02-14
修稿时间:2006年2月14日

Estimation of DC Current Distribution in AC Power System Caused by HVDC Transmission System in Ground Return Status
ZHANG Bo,ZHAO Jie,ZENG Rong,HE Jin-liang,CUI Xiang.Estimation of DC Current Distribution in AC Power System Caused by HVDC Transmission System in Ground Return Status[J].Proceedings of the CSEE,2006,26(13):84-88.
Authors:ZHANG Bo  ZHAO Jie  ZENG Rong  HE Jin-liang  CUI Xiang
Affiliation:1. State Key Lab of Power Systems, Dept. of Electrical Engineering, Tsinghua University, Haidian District, Beijing 100084, China; 2. Technology Research Center, China Southern Power Grid, Guangzhou 510620, Guangdong Province, China; 3. Department of Electrical Engineering, North China Electric Power University, Baoding 071003, Hebei Provinece, China
Abstract:The HVDC transmission system maybe operated in ground return status when the system is in debug or failure. If the ground return current of the HVDC system is large enough, some transformers in AC system may be under DC bias. In this paper, a numerical method is presented to calculate the DC current distribution in AC power system caused by a HVDC system. The method of moments is used to calculate the electric fields in complex earth structure caused by all the grounding systems including the DC grounding electrodes, the AC substation grounding systems, and the long metal pipe lines. The circuit equations are coupled to the moment method to combine the AC transmission lines with the grounding systems. Current distribution of the power system above 220 kV around Chuncheng substation in Guangdong province is analyzed when the Gui-Guang HVDC system is in ground return status. The results are compared with those of testing on site.
Keywords:current distribution  grounding electrodes  high voltage direct current transmission  direct current bias
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