城轨交通牵引系统谐波电流引起的主变压器降容率分析  

Derating of Transformers under Harmonic Currents in Urban Mass Transit Traction Power Supply System

作　　者：张明锐[1] 黎娜[1] 龚晓冬[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《铁道学报》2011年第12期38-45,共8页Journal of the China Railway Society

基　　金：教育部留学回国人员科研启动基金(08002410012);中央高校基本科研业务费专项资金(0800219169)

摘　　要：谐波电流会使变压器损耗增加,降低变压器的有效容量。本文分析城市轨道交通牵引供电系统中整流装置产生的谐波电流对主变压器造成的影响。在MATLAB-SIMULINK环境下建立12脉波和24脉波整流装置模型并得到其谐波电流数据,利用IEEE C57.110标准提供的谐波损耗因子计算谐波电流所引起的主变压器降容率。计算结果表明:谐波电流会引起不可忽视的主变压器降容率;与12脉波整流装置相比,24脉波整流对变压器降容率的影响明显较低;变压器的直流电阻损耗占负荷损耗比例越大,在相同谐波条件下额外增加的损耗越少。研究结果为轨道交通供电系统的负荷计算和主变压器容量选择提供了依据。Harmonics cause excessive losses of transformers and reduce their output capacity.This paper analyzed the effects of harmonics generated by rectifiers on the main transformer in the traction power supply system for urban mass transit.The MATLAB/SIMULINK was used to establish the models of 12-pulse and 24-pulse rectifiers and simulate the harmonic currents which were utilized for transformer derating calculation based on the standard IEEE C57.110 procedures.The results show as follows： 1） Transformer derating generated by harmonics is considerable;2） the 24-pulse rectifier has less effect on transformer derating than the 12-pulse rectifier;3） with the same harmonic currents,the higher the proportion of DC resistance losses in the total load losses of the transformer,the less the excess harmonic losses.The research resuets provide reference for load calculation and transformer capacity determination of the urban mass transit traction power supply system.

关 键 词：牵引供电系统 谐波 变压器损耗 降容率 

分 类 号：TM401[电气工程—电器]