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高压直流输电系统接地极电流对电力变压器运行影响的研究
引用本文:曹林,曾嵘,赵杰,何金良,张波.高压直流输电系统接地极电流对电力变压器运行影响的研究[J].高压电器,2006,42(5):346-348,354.
作者姓名:曹林  曾嵘  赵杰  何金良  张波
作者单位:1. 清华大学电机系电力系统及发电设备控制和仿真国家重点实验室,北京,100084
2. 南方电网技术研究中心,广东,广州,510620
摘    要:当高压直流输电系统采用单极大地回路方式运行时,可能会有部分入地电流流入中性点接地的电力变压器中,这将给系统运行和变压器本身带来诸多不利后果。采用电路-磁路耦合方法,推导建立了可以考虑负载变化的单相心式变压器模型,对偏磁电流造成的变压器工作电流谐波增加等影响进行了详细分析,并利用解析法对空载条件下的简化变压器模型进行了验证。还比较了由于负载不同使得变压器处于不同工作点时偏磁电流影响的变化。仿真结果表明,变压器运行工作点降低对提高设备耐受直流偏磁干扰的能力有积极的作用。

关 键 词:高压直流输电  变压器  直流偏磁  电路-磁路耦合模型
文章编号:1001-1609(2006)05-0346-03
收稿时间:2005-12-27
修稿时间:2005-12-272006-02-24

Study on the Influence of HVDC System Grounding Electrode Current on Power Transformer Operation
CAO Lin,ZENG Rong,ZHAO Jie,HE Jin-liang,ZHANG Bo.Study on the Influence of HVDC System Grounding Electrode Current on Power Transformer Operation[J].High Voltage Apparatus,2006,42(5):346-348,354.
Authors:CAO Lin  ZENG Rong  ZHAO Jie  HE Jin-liang  ZHANG Bo
Affiliation:1. Dept. of Electrical Engineering, Tsinghua University, State Key Lab of Control and Simulation of Power Systems and Generation Equipments, Beijing 100084, China; 2. Technology Research Center of China Southern Power Grid, Guangzhou 510620, China
Abstract:When HVDC system operates in monopolar mode and uses the earth as a return path, partial entering ground current may flow into the power transformers, which neutral point grounded, and this will bring a series unfavorable consequences to system operation and transformer. Using electromagnetic coupling method, this paper establishes model of the single-phase transformer with considering the variation of load, and analyzes the effects of such DC current on a single-phase core-form power transformer, such as increment of current harmonics and DC flux in the iron core. The simplified transformer model, under unloaded condition, is analyzed based on analytic method to verify its validity. Furthermore, the influence of different transformer operation status has also been discussed. The simulation results indicate that lower operation point can be more advantageous against the DC bias effects.
Keywords:HVDC system  power transformer  DC bias  coupled electromagnetic model
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