Power Flow Calculation of High-speed Railway Traction Network Based on Train-network Coupling Systems

A uniform chain circuit model was built for all-parallel autotransformer(AT) network according to its lines characteristics.Based on this chain model,high-speed train was treated as a constant power load in this paper.The train-network coupling model was built by train power iteration.This paper has power flow analysis in three cases in consideration of the leakage impedance of ATs and rail toward earth.Results of simulation show that the power flow calculation,under the train-network coupling condition,can well illustrate the practical power flow characteristics.And,the up and down track of all-parallel AT network has a good symmetry.Power flow calculation of traction network provides a base for analysis of power flow and voltage distribution in different conditions of high-speed railway.Moreover,this work can also analyze the power quality effects from traction system to power system.