高压直流输电线路发生电晕放电时,周围空间会充满带电离子,从而使空间电场显著增强。为了准确计算地面合成电场,基于有限元和有限体积法提出一种计算直流输电线路合成电场的混合方法。为了验证该文算法的有效性,在实验室搭建了单极性、双极性导线以及分裂导线的实验模型,并进行了大量合成电场测试。同时,与已有算法的计算结果进行了对比。实验验证和算法间对比均表明,该方法具有较好的精度。采用所提出的方法对±800 kV直流输电线路的地面合成电场进行了预测。
The ions generated by corona phenomenon of HVDC transmission lines exist in the whole interelectrode space,which can strengthen the electric field intensity.In order to accurately predict the total electric field due to corona discharge of HVDC transmission lines,a hybrid algorithm based on finite element method(FEM) and finite volume method(FVM) is proposed.The method is verified by measurement results of unipolar and bipolar conductors.Different methods are compared,and it shows that the proposed method gives better results.Finally,the proposed method is used to predict the total electric field intensity at the ground level under ±800kV DC transmission lines.