AT供电系统阻抗频率特性及谐波电流放大分析

Research on Impedance Frequency Characteristics and Harmonic Current Amplification of AT Power Supply System

为研究高速列车注入谐波电流与AT供电系统之间参数匹配引起的谐波谐振问题,根据经典Carson理论和多导体传输线理论,建立牵引网多导线等值∏型谐波模型。利用Matlab/Simulink仿真平台搭建模型进行仿真,研究了机车不同位置时、牵引网不同长度时和外部电源短路容量改变时对系统阻抗频率特性和谐波电流放大情况的影响,探讨了阻抗频率特性和谐波电流放大的相关性,得到了AT供电系统谐波谐振的相关规律,可以对AT牵引供电系统的谐波谐振现象研究提供参考。

For the study of the harmonic resonance problems of electrical matching between harmonic current injection of high-speed train and the AT power supply system,the theories of multi-conductor transmission line and classical Carson are used to establish the multi-conductor equivalent model of trac- tion power network. Based on a simulation model is built in Matlab/Simulink, the impedance-frequency characteristics and harmonic current amplification under four conditions are analyzed in this paper, which include different locomotive positions, different lengths of traction lines and different short circuit capaci- ty of external power supply. The correlation between the impedance frequency characteristic and har- monic current amplification are discussed, and the regularity of harmonic resonance of AT Power supply system is revealed, which provides reference for the study of harmonic resonance in the AT Power sup- ply system.