中文摘要：

随着中国直流输电工程的快速建设,经济发达地区输电走廊日益紧张,直流输电线路附近存在建筑物时的合成电场问题日益受到关注。对上流有限元法进行改进,使导体表面电场强度计算精度比单元电场插值方法的计算精度提高了近2个数量级,对计算过程中导线表面场强满足起晕场强约束具有重要意义。同时,对迭代过程中的节点电荷更新策略进行改进,使算法更易于实现。依托中国电力科学研究院的实验平台,对线下存在建筑物时的实际境况进行模拟实验,测量结果验证了计算方法的有效性。最后,对线下存在建筑物时的合成电场分布特点进行分析。

英文摘要：

With the rapid construction of HVDC transmission projects,in the economically developed areas in China,due to intense in transmission corridors supply,total electric field problems of the building under the HVDC transmission line are becoming increasingly prominent.Upstream finite element method was improved,with the conductor surface field strength calculation accuracy improved by nearly two orders of magnitude than the element electric field strength interpolation method,and it is important to make the conductor surface field strength satisfy the corona onset field strength constraint in the computation process.At the same time,the node charge density updating strategy was improved to make algorithm easier to implement.Relying on experimental platform of Chinese EPRI,a simulation experiment was carried out for the actual situation of the building existing underneath the HVDC line,and measurement results verifies the validity of the calculation method.Finally,the total electric field distributed feature with the building existing underneath the HVDC line was analyzed.