摘要
在交-直-交电力机车和交-直电力机车混跑线路的牵引供电系统中,存在丰富的宽频域谐波电流,且易产生车网谐振问题。文章首先采用谐波阻抗分析法建立了牵引网谐波阻抗电路模型,推导了牵引网谐振阻抗与谐波频率及供电臂长度的函数关系,分析车网谐振产生机理和谐振特性,给出了车网谐振治理方式及装置安装位置的选择;然后,针对目前牵引网的宽频域谐波,提出一种地面加装有源电力滤波器(active power filter,APF)和无源高通滤波器(high pass filter,HPF)的综合治理方法,并给出“APF+HPF”装置的工程设计方法;最后,结合国内某铁路牵引网案例进行仿真验证。仿真结果显示,采用该方法后谐波电流总畸变率由75.29%下降到1.58%(“APF+二阶HPF”滤波器)和2.55%(“APF+阻波HPF”滤波器),证明该方法对宽频域谐波具有良好的治理效果,能有效抑制车网谐振现象并消除其危害,保障了牵引供电系统的安全运行。
The traction power supply system of railways operating with a mix of AC-DC-AC and AC-DC electric locomotives frequently encounters train-traction network resonance due to the presence of harmonic currents across a wide frequency domain.In this study,the harmonic impedance analysis method was applied to establish a circuit model for harmonic impedance in traction networks.The function expression for resonance impedance in traction networks was derived in relation to harmonic frequency and feeding section length.The subsequent analysis focused on the generation mechanism and characteristics of train-traction network resonance,leading to the selection of train-traction network resonance control methods and device installation positions.Furthermore,a comprehensive control approach was proposed to address harmonics across a wide frequency domain in existing traction networks,involving the ground installation of active power filters(APFs)and passive high pass filters(HPFs),along with an engineering design solution for the APF+HPF devices.Simulation verification was conducted based on the traction network of a railway in China.The simulation results show that after adopting this approach,the total distortion rate of harmonic current decreases from 75.29%to 1.58%(APF+second-order HPF filter)and 2.55%(APF+blocking HPF filter),demonstrating the good effect of the proposed approach in controlling harmonics across a wide frequency domain.This method can ensure the safe operation of traction power supply systems by effectively suppressing train-traction network resonance and eliminating its associated hazards..
作者
龙礼兰
安友彬
吴明水
莫添珍
LONG Lian;AN Youbin;WU Mingshui;MO Tianzhen(Zhuzhou National Engineering Research Center of Converters Co.,Ltd.,Zhuzhou,Hunan 412001,China)
出处
《控制与信息技术》
2024年第5期33-40,共8页
CONTROL AND INFORMATION TECHNOLOGY
关键词
牵引供电系统
车网谐振
宽频域谐波
APF
HPF
谐波综合治理
traction power supply system
train-traction network resonance
harmonics across a wide frequency domain
active power filter(APF)
high pass filter(HPF)
comprehensive control of harmonics.
