城轨交流供电系统接触网串联谐振研究

Research on Catenary Series Resonance of Urban Rail AC Power Supply System

城轨交流供电系统因具有贯通供电、供电距离远等优点而成为研究焦点。同时它采用的电缆牵引网存在比普通裸导线高很多的分布电容,势必会对城轨交流供电系统接触网谐振规律产生影响。首先对该系统进行系统阻抗推导分析,得出系统谐振与机车位置、功率、数量及供电区间长度等诸多因素相关的结论。其次,为探究系统多种因素对接触网谐振规律的影响,建立精确链式模型,编制系统的车网耦合潮流算法,求得机车动态阻抗,阐述分析接触网串联谐振的方法。最后仿真单车、多车、单复线与将电缆替换为架空线等多个条件变化时系统接触网的串联谐振规律,结论对城轨交流供电系统工程化进展具有重要意义。

Urban rail AC power supply system has become the focus of research due to its advantages of continuous power supply and long power supply distance.At the same time,the distributed capacitance of the cable traction network is much higher than that of the ordinary bare conductor,which will inevitably affect the resonance law of thecatenary of the urban rail AC power supply system.Firstly,the system impedance was deduced and analyzed,and the conclusion that the system resonance was related to many factors such as locomotive position,power,quantity and power supply section length was obtained.Secondly,in order to explore the influence of various factors of the system on the catenary resonance law,the accurate chain model was established.The train network coupling power flow algorithm of the system was compiled,and the locomotive dynamic impedance was obtained.The train of thought of system analysis of catenary series resonance was introduced.Finally,the series resonance law of the system contact network was simulated when multiple conditions such as single-car,multi-car,single-multi-line and replacing the cable with overhead lines were changed.The conclusion was of great significance to the engineering progress of urban rail AC power supply system.