城市轨道交通柔性直流牵引供电系统钢轨电位快速计算方法

Fast Calculation of Rail Potential of Flexible DC Traction Power Supply System for Urban Rail Transit

近年来,柔性直流牵引供电系统由于能够灵活控制电压,提高再生能量利用率,越来越受重视。钢轨电位是柔性直流牵引供电系统设计的重要依据和安全稳定运行的重要指标。由于全控变流器和协同控制的引入,柔直系统钢轨电位分布特性与传统系统有显著差异,并且在钢轨电位计算精度和速度方面提出更高要求,有必要研究柔直系统钢轨电位的高效建模计算方法。文中提出一种接触网与回流网解耦的两阶段潮流计算法,提高柔直系统潮流计算的效率,并基于此分析钢轨电位的时空分布特性,发现钢轨电位的重要影响因素为柔直系统的端口电压,为钢轨电位实时抑制控制策略提供一定理论基础。

In recent years,flexible DC traction power supply systems have garnered increasing attention for their ability to control voltage flexibly and improve renewable energy utilization.Rail potential is an important design basis for flexible DC traction systems and a key index for safe and stable operation.The integration of fully controlled converters and cooperative control significantly alters the rail potential distribution characteristics compared to traditional systems.This imposes higher requirements on the accuracy and speed of rail potential calculation.Efficient modeling and calculation method for rail potential in flexible DC traction systems must be developed.This paper proposes a two-stage power flow calculation approach that decouples the catenary and the return networks,improving calculation efficiency for both flexible and straight systems.The spatiotemporal rail potential distribution characteristics are analyzed based on this.The port voltage of the flexible DC traction system is found to be the key influencing factor,providing a theoretical basis for real-time rail potential suppression control strategies.