薄弱电网地区电气化铁路谐波谐振研究

Research on Harmonic Resonance of Electrified Railway in Weak Grid Area

针对广大薄弱电网地区的电气化铁路可能出现的谐波放大等问题进行了谐波谐振研究,建立了“外部薄弱电网—牵引变压器—牵引网—牵引负荷”谐波模型;应用模态分析法对系统谐振进行分析。结果表明,薄弱电网下的牵引供电系统产生了有别于普通牵引供电系统的新谐振现象,即除了系统原有的3个谐振点,还形成了多个广泛分布的由3个相邻谐振点组成的谐振带,为研究薄弱电网地区电气化铁路的谐波谐振问题提供了参考。

Aiming at the possible harmonic amplification of electrified railway in weak power grid areas,the harmonic resonance is studied.The harmonic model of"external weak power grid traction transformer traction network traction load"is established.The modal analysis method is used to analyze the system resonance.The results show that the traction power supply system under the weak power grid has a new resonance phenomenon different from the ordinary traction power supply system,that is,in addition to the original three resonance points of the system,a number of widely distributed resonance bands composed of three adjacent resonance points are formed,which provides a reference for the study of harmonic resonance of electrified railway in the weak power grid area.