HVDC地中电流对交流变压器影响的抑制措施

Measure to Decrease the Neutral Current of the AC Transformer in HVDC Ground-Return System

由于直流线路单极检修或发生故障 ,线路单极运行在金属大地回路方式时 ,会对与之紧密耦合的交流电网带来一系列问题与不利影响 ,故从理论上分析了HVDC地中直流对于交流变压器影响的基本机理 ,还比较分析了国内外为减小该影响可能采取的各种措施并对南方电网相关工作提出了相应的建议。

The HVDC power transmission systems usually operate in ground return mode when the emergency occur and system is in maintenance. And in these circumstances, some disadvantage effect will bring out in the AC transmission system, especially to the transformer which the neutral point is connected directly with the grounding system. The reason of such kind of influences is analyzed in this article and different measures to deal with this influence are compared too. And in the end, some useful suggestions for Southern grid are illustrated here.