用于分析土壤结构对直流偏磁电流影响的简化网架模型

直流偏磁电流的大小受多种因素的影响，其中土壤结构是其中最重要的因素之一，为了更准确地分析高压直流输电系统单极大地回线运行时土壤结构对变压器直流偏磁电流的影响，提出了一种简化的网架模型用于分析不同土壤结构对直流偏磁电流的影响。首先以直流输电规程中的计算方法对本文方法进行了验证，并分析了几种不同土壤模型下直流偏磁电流的变化情况。结果表明：基于本文模型所得结果与现有研究关于土壤结构对直流偏磁电流的影响情况趋势一致，本文采用的简化网架模型能够为土壤结构对直流偏磁电流的影响提供定性和定量的参考。

A Simplified Model for Analyzing the Influenceof Soil Structure on DC Bias Current

The DC bias current is affected by many factors, among them, the soil structure is one of the most important factors. In order to analyze the influence of the soil structure on the DC bias current of HVDC transmission system more accurately, a simplified grid model is proposed to analyze the influence of the soil structure on DC bias current. First of all, the calculation method in direct current transmission regulation is applied to verify the method, the DC bias current under several different soil models is analyzed. The results show that the tendency of the result from simplified grid model and the existing research is consistent, and The simplified grid model used in this paper can provide qualitative and quantitative references for the influence of soil structure on DC bias current.