电气化铁路接入末端电网的三相不平衡影响因素分析

Analysis of Influencing Factors of Three-phase Unbalance for Electrified Railway Connected to Terminal Power Grid

近年来,伴随着电气化铁路接入新疆电网,致使新疆电网末端弱联系地区电能质量问题突显出来,文中针对格库铁路接入新疆巴州地区电网带来的三相不平衡问题开展影响因素分析。首先,根据三相电压不平衡的概念及表达式开展电气化铁路负序三相不平衡的分析计算,得出三相不平衡的影响因素;然后,基于电力电气以及电能管理的综合分析软件(简称ETAP)搭建格库铁路接入新疆电网的典型仿真模型,仿真分析格库铁路接入末端弱联系电网带来的三相不平衡问题的影响因素;最后,分析基于实测数据的负序电流及电压产生的三相不平衡对电力系统及用户的影响,并利用ETAP软件分别从电铁侧和电网侧验证改善三相电压不平衡措施的有效性。

In recent years,a large number of electrified railways have been connected to Xinjiang power grid,resulting in prominent power quality problems in weak connection areas of Xinjiang power grid.The influencing factors of three-phase unbalance caused by the connection of Geermu-Kuerle Railway to Xinjiang Bazhou regional power grid is analyzed.Firstly,according to the concept and expression of three-phase voltage unbalance,the negative sequence three-phase unbalance of electrified railway is analyzed and calculated,and the influencing factors of three-phase unbalance are obtained.Secondly,based on the comprehensive analysis software system of electric power analysis and electric power management(hereinarfter abbreviated as ETAP),a typical simulation model of the connection of Geermu-Kuerle Railway to Xinjiang power grid is built to verify the influencing factors of three-phase unbalance of the connection of electrified railway to the power grid.Finally,the influence of three-phase unbalance caused by negative sequence current and negative sequence voltage based on the measured data on the power system and users is analyzed,and ETAP software is used to verify the effectiveness of improvement measures for three-phase voltage unbalance from the railway side and the grid side.