高压直流输电线路标称电场强度计算模型

摘要

针对高压直流输电线路的标称电场强度计算问题，以宜昌龙泉至常州政平的±500 kV 高压直流输电线路为例，依据常用的简化计算方法，使用有限元分析软件 COMSOL Multiphysics 建立了四分裂导线–架空地线模型、单纯的四分裂导线模型和等效导线–架空地线模型。对3种模型进行仿真，并以四分裂导线–架空地线模型为参照，对比不同模型的标称电场强度分布。得出结论：架空地线对直流输电线路周围标称电场强度的影响很小，在工程应用中采用忽略架空地线的简化模型是可行；等效导线简化模型不适于分析线路附近的电场强度，但适于分析距离线路较远的区域且计算量大幅减少。%In allusion to calculation on nominal electric field of high voltage direct current (DC)transmission lines,this pa-per takes ±500 kV high voltage DC transmission line from YichangLongquan to Changzhou Zhengping for an example and uses finite element analysis software COMSOL Multiphysics to establish a bundled conductor-overhead ground wire model,a simple bundled conductor model and an equivalent conductor-overhead ground wire model according to common simplified calculation method. It carries on simulation for these three models and takes the bundled conductor-overhead ground wire model as reference for comparing distribution of nominal electric field of different models. Finally it concludes that the o-verhead ground wire has slight influence on nominal electric field around DC transmission lines,which means it is feasible to ignore the simplified model of overhead ground wire in engineering application. The simplified model for equivalent conduc-tor is not suitable for analyzing electric field near to lines while it is suitable for analyzing electric field of regions far away from lines and has reduced calculating amount.