换流变压器中直流偏磁电流的计算

DC Biasing Current in Converter Transformer

根据背靠背直流系统的技术特点 ,详细计算了由于触发不平衡和交流系统正序二次谐波在换流变压器中产生的直流偏磁电流。计算结果表明 ,2 2 0kV和 330kV侧每台换流变压器网侧绕组中最大等效直流电流的计算值分别为 5 .2和 3.5A ,符合设计要求。

The DC biasing current has been calculated in detail, which will go through the converter transformer winding in BTB DC system due to unbalance firing and the second harmonic voltage of positive sequence on the AC converter bus. Converted to the winding of transformer the equivalent DC current through each converter transformer is 5.2 A and 3.5 A respectively on 220 kV and 330 kV side, which meets the design specification.