CAJ | 학술논문

交直流共走廊输电系统换流变偏磁直流量构成比较复杂，正确分析其构成分量对系统稳定运行具有重要意义。建立了换流变直流偏磁模型和交直流共走廊输电线路模型，分别计算了土壤地电位和交直流工频感应产生的直流量；研究了交直流线路平行架设长度、交直流杆塔中心接近距离对换流变偏磁的影响规律。研究结果表明：交直流线路平行架设长度越长，换流变偏磁直流量越大，工频感应产生直流量占总直流量的比重越大，且土壤地电位对此比重影响越小；交直流杆塔中心接近距离越大，换流变偏磁直流量越小，工频感应产生直流量占总直流量的比重越小，且土壤地电位对此比重影响越大。
교직류공주랑수전계통환류변편자직류량구성비교복잡，정학분석기구성분량대계통은정운행구유중요의의。건립료환류변직류편자모형화교직류공주랑수전선로모형，분별계산료토양지전위화교직류공빈감응산생적직류량；연구료교직류선로평행가설장도、교직류간탑중심접근거리대환류변편자적영향규률。연구결과표명：교직류선로평행가설장도월장，환류변편자직류량월대，공빈감응산생직류량점총직류량적비중월대，차토양지전위대차비중영향월소；교직류간탑중심접근거리월대，환류변편자직류량월소，공빈감응산생직류량점총직류량적비중월소，차토양지전위대차비중영향월대。
In view of complex composition of DC magnetic biasing in converter transformer for AC/DC corridor-sharing power transmission system, it is of significance for stable operation of the transmission system to correctly analyze its constituents. A DC magnetic biasing model for converter transformer and a transmission line model of AC/DC corridor-sharing power transmission system are built, and the DC quantities due to ground potential of the soil and power frequency induction of AC/DC transmission line are calculated respectively; the influencing rule of parallelly erected lengths of AC/DC transmission lines and the approach distance between the centers of AC and DC transmission towers on DC magnetic biasing in converter transformer is researched. Research results show that the longer the parallelly erected lengths of AC/DC transmission lines, the larger the DC magnetic biasing in converter transformer is, and the higher proportion of DC magnetic biasing due to power frequency induction in the total DC biasing, the lighter impact of ground potential of the soil on this proportion will be; the farther the approach distance between the centers of AC and DC transmission towers, the lower the DC magnetic biasing in converter transformer will be, and the smaller the proportion of DC magnetic biasing component due to power frequency induction in total DC magnetic biasing, the stronger impact of ground potential of the soil on this proportion will be.