电力机车是电气化铁路牵引供电系统的主要谐波源之一,电力机车的运行对供电电网产生一定的电能质量影响.详细分析了CRH2型电力机车的电路拓扑结构和控制原理,利用Matlab软件中的Simulink仿真平台搭建了CRH2型电力机车仿真模型.采用典型参数进行仿真验证了模型的实用性,并利用SIMPOWERSYSTEM工具箱中的POWERGUI对CRH2整流器网侧电流进行FFT分析,得到了低次谐波和高次谐波的分布情况. Electric locomotive is one of the main harmonic sources of traction power supply system for electrified railway, and the operation of electric locomotive has a certain power quality impact on the power supply network.It analyzes the circuit topology and control principle of CRH2 electric locomotive in detail, Simulink simulation platform is used to build the CRH2 electric locomotive simulation model.The typical parameters are used to verify the practicability of the model and the FFT analysis of the CRH2 rectifier grid-side current using POWERGUI in the SIMPOWERSYSTEM toolbox shows that the low-order harmonics and the high Sub-harmonic distribution.