摘要
高速铁路特殊运行方式会产生大量的谐波,谐波会通过牵引变压器传入220 kV侧高压电缆,在电缆护层上产生谐波电压,威胁电缆的安全运行。笔者在牵引变电所现场实测谐波数据的基础上,建立了基于实测数据的谐波源模型,解决了谐波源建模复杂的问题并能准确反映出高铁列车的实际运行状况。在此基础上仿真计算了高铁在牵引、再生制动和惰性3种工况下220 kV侧电缆护层谐波电压特性,探究了电缆长度、电缆接地方式、谐波电流参数等对谐波电压的影响规律。结果表明:高铁不同运行方式下,护层谐波电压均远超过工频正常运行情况,其中牵引工况时电缆护层谐波电压最大值可达到454 V;与工频正常情况下不同,谐波工况下金属护层过电压受电缆接地方式、电缆长度和谐波电流含量的影响较大。以上研究结果对牵引站220 kV侧电缆的安全运行具有重要参考意义。
The special operation mode of high-speed railway will generate a large amount of harmonics.The harmonics will be transmitted to the 220 kV side high-voltage cables through the traction transfor-mer,and harmonic voltages will be generated on the cable sheath,threatening the safe operation of the cables.On the basis of the measured harmonic data of the traction substation,a harmonic source model based on the measured data is established,which solves the complex problem of harmonic source mode-ling and can accurately reflect the actual operating conditions of high-speed trains.On this basis,the harmonic voltage characteristics of the cable sheath on the 220 kV side of the high-speed railway under the three working conditions of traction,regenerative braking and inertia are simulated and calculated,and the effects of cable length,cable grounding method,and harmonic current parameters on the harmonic voltage are explored.The results show that under different operation modes of high-speed rail,the harmonic voltage of the sheath far exceeds the normal operation of the power frequency,and the maximum value of the harmonic voltage of the cable sheath can reach 454 V under the traction condition;Under working conditions,the overvoltage of the metal sheath is greatly affected by the grounding method of the cable,the length of the cable and the harmonic current content.The above research results have important reference significance for the safe operation of electrified railways.
作者
方春华
庄立
张怡琳
李放
曹京荥
谭笑
李陈莹
候正宇
FANG Chunhua;ZHUANG Li;ZHANG Yilin;LI Fang;CAO Jingying;TAN Xiao;LI Chenying;HOU Zhengyu(College of Electrical Engineering and New Energy,Three Gorges University,Yichang 443002,China;State Grid Jiangsu Electric Power Research Institute,Nanjing 211102,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第2期9-17,共9页
Insulators and Surge Arresters
基金
国家自然科学基金(编号:51807110)。
关键词
过电压
铁路谐波
金属护层
影响因素
over voltage
railway harmonics
cable sheath
influencing factors
