中文摘要：

动车组谐波特性及谐波建模对牵引供电系统电能质量评估与分析具有重要意义。基于CRH380A动车组实测数据,根据谐波幅值分布特点将动车组注入电流谐波分为低次（3-17次）谐波和高次特征（43-57次）谐波,分别分析低次与高次谐波在复平面的幅值、相角特性。采用一种实测数据与Norton等效模型相结合的方法,对此类动车组系统建模。对比不同工况、功率下的谐波幅值,并在统一建模中考虑工况、输出功率对谐波幅值的影响。通过误差分析验证模型的准确性与有效性,利用实测数据模拟动车组动态谐波过程,对比计算得到的动态模型与实测数据的谐波幅值概率分布。结果表明：该方法能够有效还原动车组谐波电流注入的波动过程,且具有相似的谐波特性。

英文摘要：

The harmonic characteristics and modeling for electric multiple units（EMU）are important for the evaluation and analysis of the power quality of traction power supply system.Based on massive field data from CRH380 AEMU,this paper classified the injected current harmonics from the EMU by distribution features of harmonic amplitude into low-order（3rd-17 th order）harmonics and high-order（43th-57 th order）harmonics.Their amplitude and phase angle characteristics in complex plane were analyzed respectively.Meanwhile,this paper presented a harmonic modeling method for such EMU system based on field data and Norton equivalent model.The harmonic amplitudes under different working conditions and output power were compared and the effects of operating conditions and output power on harmonic amplitude were considered in the modeling.The accuracy and effectiveness of the proposed model were verified by THD comparison and correlation coefficient analysis.The dynamic harmonic process of the EMU was simulated with field data and the probability distribution of the calculated dynamic model and field data was compared.The results showed the proposed method can effectively restore the dynamic process of the injected current and was featured with similar harmonic characteristics.