直流输电地中回流对高速铁路系统影响的仿真研究

随着我国直流输电工程与高速铁路的迅速增加，直流接地极与高速铁路相接近的情况时有发生。为了研究直流输电地中回流对高速铁路系统的影响，通过分析高速铁路系统的构成及直流通路，建立了其电路模型，并通过电磁场方法求解出了该模型的电气参数和直流输电地中电流在其上产生的地电位，将两者相结合构成了直流输电地中回流对高速铁路系统影响的计算模型。基于该模型，计算了高速铁路沿线地电位分布和流经牵引供电系统变压器的直流电流，分析了土壤电阻率、直流接地极距离等因素的影响。研究表明，直流输电地中电流对高铁动车组牵引变压器基本无影响，但对牵引变电所、AT所内和分区所变压器有一定偏磁影响，设计时应重点校验。

Numerical Analysis of Influence of Ground Return Current in HVDC Ground Electrode on High Speed Railway System

With the rapid increase in HVDC transmission lines and high-speed railways in China， the situation that DC ground electrode is close to the high-speed railway has occurred from time to time. In order to study the influence of the ground return current of the DC ground electrode on the high-speed railway system， this paper establishes its circuit model by analyzing the composition of the high-speed railway system and the DC path. By using electromagnetic numerical method， the electrical parameters of the model and the ground potential generated by the current from the DC ground electrode are solved， and then a numerical model of the influence of the ground return current of the DC ground electrode on the high-speed railway system is developed. Based on this model， the ground potential distribution along the high-speed railway lines and the DC current flowing through the transformers in traction power supply system is calculated. The effects of soil resistivity， the position of the DC ground electrode are analyzed. The research shows that the ground return current has almost no effect on the traction transformer for the high-speed railway electric multiple unit. But it has a certain bias effect on the transformer in the traction substation， AT station and sub-district.， the design should focus on verification.