摘要
目前国内大部分的城市轨道交通牵引变电所是采用24脉波整流机组对从降压变电所中所引入的交流电源进行整流。分析了24脉波整流机组的工作机理并对调制理论的基本原理作了简要阐述;从三相全桥6脉波整流电路出发,逐步推导出了不考虑换相角时的24脉波整流机组电压电流开关函数;在此基础上基于调制理论和时域FFT分析方法对理想状态下的24脉波整流机组的直流侧特征谐波进行了理论分析;最后在Matlab/Simulink中建立了仿真模型,验证了基于调制理论分析的直流侧特征谐波分布的正确性和有效性,从而为24脉波整流机组的交直流谐波分析提供了一种新的途径。
At present,most of the domestic urban rail transit traction substations adopt the 24-pulse rectifier unit to rectify the AC power from the step-down transformer substations. The working mechanism of 24 pulse rectifier and the basic principle of the modulation theory are presented. Started from the three-phase full-bridge 6-pulse rectifier circuit,the voltage and current switching functions of the 24-pulse rectifier unit without considering the commutation angle are derived gradually. Based on the modulation theory and time-domain FFT analysis method,the harmonic characteristics of 24-pulse rectifier unit at the DC side under the ideal state are analyzed in theory;The simulation model is established with Matlab/Simulink software to verify the correctness and the validity of the harmonics distribution at the DC side under the ideal state based on the modulation theory,which provides a new way for the harmonic analysis of 24-pulse rectifier unit both at the AC side and the DC side.
出处
《电气传动自动化》
2016年第2期28-33,共6页
Electric Drive Automation
关键词
24脉波整流机组
开关函数
调制理论
FFT
特征谐波
24-pulse rectifier unit
characteristic harmonic
switching function
modulation theory
FFT
