牵引供电是车辆在运输的过程中所需要拖动电能的供电方式,是电气化铁道在运行过程中的主要供电方式。作为电力系统的一个特殊用户,电气化铁路具有非线性、不对称和波动性的特点。现通过笔者多年的工作经验对牵引供电系统中所存在的电气化铁路负荷电流和谐波进行阐述,分析了电气化铁路负序电流和谐波对电力系统的影响。 Traction power supply is the power supply mode that the vehicle needs to drag electric energy in the process of transportation and is the main power supply mode of the electrified railway in operation. As a special user of the power system, the electrified railway has the characteristics of non-linearity, asymmetry and volatility. Through the author’s many years of experience, this paper expounds the load current and harmonics of electrified railway existing in traction power supply system, and analyzes the influence of negative sequence current and harmonic of electrified railway on power system.