输电线路地线对流入变压器中性点直流电流的影响
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摘要
交流变压器中性点流入直流电流会导致变压器偏磁等一系列不良后果。基于特定模型,使用场路耦合的方法研究了500kV直流输电线路以大地为回路运行时与变电站相连的输电线路地线上流过的直流电流对流过变压器中性点的总直流电流的影响。研究发现,线路地线对流入变压器中性点的直流电流影响很小,因此在进一步研究流入交流变电站变压器中性点的直流电流时可以忽略线路地线,从而可简化分析模型。
A series of harmful results, e.g., DC bias ofpower transformer, may occur if direct current exceeding acertain value flows into the neutral point of power transformerin AC power system. Based on a specified model the impact ofthe direct current flowing through the ground wire of 500kVHVDC transmission line on the total direct current flowingthrough the neutral point of power transformer is researched bythe coupling method of electric field with electric circuit. It isdiscovered from the research result that the impact of HVDCline’s ground wire on the direct current flowing into the neutralpoint of power transformer is very weak, therefore in furtherresearch on the direct current flowing into the neutral point ofpower transformer the impact of HVDC line can be neglected,thus the analytical model of this research can be simplified.
A series of harmful results, e.g., DC bias ofpower transformer, may occur if direct current exceeding acertain value flows into the neutral point of power transformerin AC power system. Based on a specified model the impact ofthe direct current flowing through the ground wire of 500kVHVDC transmission line on the total direct current flowingthrough the neutral point of power transformer is researched bythe coupling method of electric field with electric circuit. It isdiscovered from the research result that the impact of HVDCline’s ground wire on the direct current flowing into the neutralpoint of power transformer is very weak, therefore in furtherresearch on the direct current flowing into the neutral point ofpower transformer the impact of HVDC line can be neglected,thus the analytical model of this research can be simplified.
引文
[1]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
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[4]余建国,晁剑,钱海.天广直流输电工程极1单极运行强迫停运故障原因分析和改进措施[J].电网技术,2002,26(5):80-83.Yu Jianguo,Chao Jian,Qian Hai.Analysis of forced outages of pole1in Tian-Guang HVDC transmission project under single pole operation and its counter measures[J].Power System Technology,2002,26(5):80-83.
[5]钟连宏,陆培均,仇志成,等.直流接地极电流对中性点直接接地变压器影响[J].高电压技术,2003,29(8):12-13.Zhong Lianhong,Lu Peijun,Qiu Zhicheng et al.The influence of current of DC earthing electrode on directly grounded transformer[J].High Voltage Engineering,2003,29(8):12-13.
[6]王明新,张强.直流输电系统接地极电流对交流电网的影响分析[J].电网技术,2005,29(3):9-14.Wang Mingxin,Zhang Qiang.Analysis on influence of ground electrode current in HVDC on AC power network[J].Power System Technology,2005,29(3):9-14.
[7]张波,崔翔,赵志斌,等.大型变电站接地网的频域分析方法[J].中国电机工程学报,2002,22(9):59-63.Zhang Bo,Cui Xiang,Zhao Zhibin et al.Analysis of grounding grids at large scale substations in frequency domain[J].Proceedings of the CSEE,2002,22(9):59-63.
[8]Dawalibi F P.Electromagnetic fields generated by overhead and buried short conductors,part2-ground conductor[J].IEEE Trans on Power Delivery,1986,1(4):112-119.
[9]滕吉文.固体地球物理学概论[M].北京:地震出版社,2003.
[10]南方电网技术研究中心.HVDC系统地中电流对交流系统及其它设施的影响及防范措施研究[R].广州:南方电网技术研究中心,2005.
[2]黄莹,徐政,曾德文,等.西电东送纯直流输电方案研究[J].电网技术,2004,28(19):1-4.Huang Ying,Xu Zheng,Zeng Dewen et al.Study on pure DC transmission from west China to east China[J].Power SystemTechnology,2004,28(19):1-4.
[3]叶廷路.葛南直流输电系统的运行与控制[J].电网技术,1994,18(1):20-25.Ye Tinglu.The operation and control of Ge-Nan HVDC transmission system[J].Power System Technology,1994,18(1):20-25.
[4]余建国,晁剑,钱海.天广直流输电工程极1单极运行强迫停运故障原因分析和改进措施[J].电网技术,2002,26(5):80-83.Yu Jianguo,Chao Jian,Qian Hai.Analysis of forced outages of pole1in Tian-Guang HVDC transmission project under single pole operation and its counter measures[J].Power System Technology,2002,26(5):80-83.
[5]钟连宏,陆培均,仇志成,等.直流接地极电流对中性点直接接地变压器影响[J].高电压技术,2003,29(8):12-13.Zhong Lianhong,Lu Peijun,Qiu Zhicheng et al.The influence of current of DC earthing electrode on directly grounded transformer[J].High Voltage Engineering,2003,29(8):12-13.
[6]王明新,张强.直流输电系统接地极电流对交流电网的影响分析[J].电网技术,2005,29(3):9-14.Wang Mingxin,Zhang Qiang.Analysis on influence of ground electrode current in HVDC on AC power network[J].Power System Technology,2005,29(3):9-14.
[7]张波,崔翔,赵志斌,等.大型变电站接地网的频域分析方法[J].中国电机工程学报,2002,22(9):59-63.Zhang Bo,Cui Xiang,Zhao Zhibin et al.Analysis of grounding grids at large scale substations in frequency domain[J].Proceedings of the CSEE,2002,22(9):59-63.
[8]Dawalibi F P.Electromagnetic fields generated by overhead and buried short conductors,part2-ground conductor[J].IEEE Trans on Power Delivery,1986,1(4):112-119.
[9]滕吉文.固体地球物理学概论[M].北京:地震出版社,2003.
[10]南方电网技术研究中心.HVDC系统地中电流对交流系统及其它设施的影响及防范措施研究[R].广州:南方电网技术研究中心,2005.
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