中文摘要：

高压直流线路在我国实际工程中得到广泛应用,基于Deutsch假设的方法和有限元法常用来计算其地面合成电场。为此,对比分析了2种计算方法的区别及可能造成计算误差的原因,讨论了采取不同的方法计算同一水平排列或垂直排列高压直流线路地面合成电场时带来的计算结果差异。结果表明：对于水平排列直流线路,采用基于Deutsch假设的方法得到的地面合成电场最大值与等效导线有限元法的相对差别不到4%,而与分裂导线有限元法的相对差别通常在10%以上;对于垂直排列直流线路,采用基于Deutsch假设的方法得到的地面合成电场最大值与等效导线有限元法的相对差别在5%~15%之间,而与分裂导线有限元法的相对差别通常在30%以上。

英文摘要：

HVDC power transmission is widely applied in China and the Deutsch assumption-based method and the finite element method are usually applied to calculate the total electric fields at ground level under HVDC transmission lines.The differences of the two calculation methods and the reason that may cause calculation errors by the two calculation methods are contrasted and analyzed,and the difference between calculation results of the total electric field at the ground level under the same horizontally or vertically configured HVDC transmission line,which is brought by different methods,is discussed.Discussion results show that for horizontally configured HVDC transmission line the relative difference between the maximum value of the total electric field at ground level calculated by the Deutsch assumption-based method and that calculated by the finite element method with equivalent conductor is less than 4%,however the relative difference between the former and that calculated by finite element method with bundled conductor is larger than 10%;for vertically configured HVDC transmission line,the relative difference between maximum value of the total electric field at ground level calculated by the Deutsch assumption-based method and that calculated by the finite element method with equivalent conductor is within the range from 5% to 15%,however the relative difference between the former and that calculated by finite element method with bundled conductor is usually larger than 30%.