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高压电器  2015 

±800 kV天―中直流对哈密电网变压器直流偏磁影响的仿真和实测研究

DOI: 10.13296/j.1001-1609.hva.2015.11.028, PP. 168-175

Keywords: 天中直流,变压器,直流偏磁,仿真与实测,偏磁抑制

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Abstract:

±800kV天―中特高压直流工程于2013年投运,天山换流站地处哈密电网变电站集中地带,其接地极位置较为特殊,为研究天中直流在单极大地方式运行时对哈密电网变压器直流偏磁的影响,通过交流电网直流电流分布计算软件仿真计算分析了哈密电网变压器直流分布的情况,同时在系统高端调试期间对换流站所在的哈密地区电网直流偏磁进行了多点测量,积累了大量实测数据。仿真结果表明,在天中直流大功率单极大地运行时,离天山换流站较近的220kV中性点接地变压器中性点直流电流较大,实测也发现与仿真类似的结果,仿真结果与实测数据基本相符合,严重威胁主变偏磁运行,后期通过在直流电流过大的主变加装了直流偏磁抑制装置,实测表明其大大降低了变压器中性点的偏磁电流,提高了哈密地区电网的安全性和可靠性。

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