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This paper introduces a method to calculate the ion flow field of HVDC transmission lines. The method takes into consideration the intensity of the corona discharge on Conductor surface. It is applicable to the calculation of the ion flow field of HVDC lines not only under normal weather condition but also under foul weather conditions such as rainy or highly humid weather and so on. The calculating results agree very well with the relevant field testing and experimental results publishecl before. 本文介绍了一种计算HVDC线路离子流场的方法,它能够把导线表面电晕活动强度这个因素也考虑在计算中。该方法不仅能分析正常气象条件下的线路的地面场强和离子电流,而且也能对一些较特殊的气象条件(如下雨或相对湿度很大等情况)下的线路地面场强和离子电流进行正确的分析计算。各种情况下的计算结果均与一些已发表的有关计算和实测结果相一致。 Based on the commonly used mathematical model of the ion flow field of HVDC lines, the relationship between the ion flow field of actual HVDC lines and that of scaled model lines has been derived theoretically. The necessary condition that the scaled model lines has to be satisfied to has also been obtained. The numerical method is used to calculate the ion flow field under actual HVDC lines and under scaled model lines respectively. It is shown that the ion flow fields of both lines accord with the derived... Based on the commonly used mathematical model of the ion flow field of HVDC lines, the relationship between the ion flow field of actual HVDC lines and that of scaled model lines has been derived theoretically. The necessary condition that the scaled model lines has to be satisfied to has also been obtained. The numerical method is used to calculate the ion flow field under actual HVDC lines and under scaled model lines respectively. It is shown that the ion flow fields of both lines accord with the derived relationship very well indeed. 由HVDC线路的离子流场数学模型,严格地从理论上导出实际HVDC线路离子流场与比例模型线路离子流场间的关系,同时还导出为预测实际HVDC线路离子流场建立的模型线路应满足的必要条件。采用数值计算法对实际HVDC线路和比例模型线路的离子流场分别进行了计算,结果表明两者确实很好地服从导出的上述关系。 In this paper multigrid method which is very effective in solving the boundary-value problems is introduced. The computational efficiency and convergence speed of multigrid method are much better than those of finite difference method or finite element method. It is used to calculate the ion flow field under HVDC transmission line. It is shown that the results using multigrid methodare more consistent with measured results compared with the results using finite element method. 简要介绍了一种求解偏微分方程边值问题的有效方法——多重网格法,它比有限差分法和有限元法具有更高的计算效率和收敛速度。通过对HVDC线路非线性离子流场的计算表明,由多重网格法计算得到的结果比采用有限元法更接近于实际测量值。
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