Resonance Reguarlarity Research Of Traction Network

AC-DC traction load is one kind of high power single-phase rectifier device and Electric locomotive is the dominant harmonic source in electrified railway traction network. And harmonic resonance is natural of traction network. Study has been made on harmonic impedance and harmonic resonance of traction network in this thesis.In this thesis, mathematical models of electrical components of electrified railway traction network are summarized, with the way to build up the node admittance matrix of traction network chain model and calculate the electrical parameters being emphasized on. The mature method in power system is applied in calculating the series impedance and shunt admittance of traction network considering its topology and the particularity of its transmission lines.A simulation model is built m MATLAB/SIMULINK, based on the example of Beijing-Tianjin Intercity Rail traction network. And from the simulation performed on this model, the impedance-frequency characteristics of three modes of AT power supply system are obtained as well as the accurate resonance frequency. And the influence of line length and paralleling compensating device on resonance frequency is studied.In this thesis, simulation is performed on a harmonic model of cophase transfixion traction power supply system with the leakage of resonance current analyzed and the relation between resonance and harmonic current amplification studied.The regularity of harmonic resonance of electrified railway traction network is revealed, a more accurate mathematical and a simulation model are built, and the basis on which accidents of resonance could be prevented resonance is provided. And this thesis can be a reference of harmonic analysis in cophase cophase transfixion traction network.