锦屏—苏南特高压直流输电入地电流在四川电网内分布的预测分析  

Forecast and analysis of Jinping-Sunan UHVDC earth-return current distribution in Sichuan power grid

作　　者：陈丹[1] 

机构地区：[1]四川省电力公司,四川成都610000

出　　处：《电力系统保护与控制》2012年第14期92-96,共5页Power System Protection and Control

摘　　要：为探讨交流电网直流电流分布的机理,在理论分析基础上建立了直流电流分布的计算模型。以2014年规划运行方式为基准,预报和分析锦屏-苏南±800kV特高压直流输电工程4950A入地电流在四川电网内的分布规律和各变电站遭受直流偏磁的风险。计算结果表明四川电网受影响的站点主要是分布在直流极附近方圆120km范围内。最后还特别探讨了锦屏-苏南±800kV特高压直流输电对四川电网待建的特高压变电站的影响和后续抑制方案,分析表明这方面的问题并不突出。By theoretical analysis, the calculation model of DC current distribution of AC power grid is built to explore the mechanism of DC current distribution in AC power grid. The forecast and analysis of Jinping-Sunan 4-800 kV UHVDC 4950A earth-return current distribution rule in Sichuan power grid as well as substations＇ taking risks of DC magnetic biasing is carried out in line with the 2014 program. Computation results show that the area of infection is mainly within the radius of 120 krn around DC grounding electrode. In the end, the effect of Jinping-Sunan ___ 800 kV UHVDC on the UHV substation to be built as well as its mitigation measurement is particularly discussed. Evaluation results show that these problems will not be serious.

关 键 词：特高压直流输电 特高压变电站 直流分布 变压器 直流偏磁 建模 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM711