牵引网宽频带谐波阻抗测试系统设计及长大隧道测试应用

Design of Broadband Harmonic Impedance Testing System for Traction Network and its Application in Long Tunnels

铁路牵引供电系统在宽频带中存在谐波谐振问题,不仅影响供电系统的电能质量,而且可能引起严重的谐波谐振事故,造成供电系统设备损毁,严重威胁供电安全。牵引网的阻抗频率特性是谐波谐振现象产生的关键因素,具有一定的研究价值,但是通过仿真计算难以准确获得。因此,通过测试的方法获得宽频带下牵引网的阻抗频率特性尤为重要,其对于既有线路谐波谐振问题治理和新建线路谐波谐振问题预测评估具有重要意义。本文基于现有的谐波阻抗测试装置设计一套牵引网宽频带谐波阻抗测试系统,并提出一种适用于宽频带的基于间谐波插值改进波动量法的谐波阻抗测试算法,提高谐波阻抗测试结果的准确性。最后以玉磨铁路万和隧道牵引网谐波阻抗测试为例,对测试系统在长大隧道中的实际应用进行了研究。

Not only the harmonic resonant in the broadband of railway traction power supply system can affect the power quality of the power supply system but also it also cause serious harmonic resonance accidents,leading to damage of the power supply system equipment and seriously threatening the power supply safety.The impedance frequency characteristic of traction network is the key factor of harmonic resonance,which has certain research value,but it is difficult to obtain accurately through simulation.Therefore,it is particularly important to obtain the impedance frequency characteristics of traction network in broadband by testing,which is of great significance for the treatment of harmonic resonance problems of existing lines and the prediction and evaluation of harmonic resonance problems of new lines.In the paper,based on the existing harmonic impedance testing device,a broadband harmonic impedance testing system for traction network is designed,and a broadband harmonic impedance testing algorithm based on inter-harmonic interpolation improved volatility method is proposed to improve the accuracy of harmonic impedance testing results.Finally,the practical application of the test system in long tunnels is studied by taking the harmonic impedance test of traction network in Wanhe tunnel of Yuxi-Mohan railway as an example.