基于调制理论的24脉波整流机组直流侧谐波分析  

Harmonic analysis of 24-pulse rectifier unit at the DC side based on modulation theory

作　　者：陈欢[1] 宋平岗[1] 罗剑[1] 戈旺 朱维昌 

机构地区：[1]华东交通大学电气与电子工程学院,江西南昌330013

出　　处：《电气传动自动化》2016年第2期28-33,共6页Electric Drive Automation

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.

关 键 词：24脉波整流机组 开关函数 调制理论 FFT 特征谐波 

分 类 号：TM922[电气工程—电力电子与电力传动]