Study on Parallel Resonance Frequency of Traction Power Supply System for Train Groups Based on Modal Analysis Method
As the transport volume of heavy-haul railways continuously increases,the problem of insufficient traffic capacity may be addressed by increasing the number of trains utilizing one and the same supply arm.However,when the number of trains is increased,the harmonic currents generated by multiple trains may be distributed at multiple locations of the traction network and may be superimposed,which causes serious accidents related to the parallel resonance of traction power supply systems.Therefore,it is necessary to study the frequency distribution of system harmonic resonance in the situation of multi-train operation.In this paper,the conductor multi-conductor step-down method is adopted to establish a simplified equivalent circuit model for the traction network.Then,the modal analysis method is utilized to study the frequency changes of the parallel resonance of traction power supply systems in the situation of multi-train operation with power variation,so as to obtain the node participation information of harmonic resonance.The research results shows that when 6 trains operate in the traction network with power variation of 4～8 MW,there are 38～43 low-order harmonic waves and 116～118 high-order harmonic waves related to system harmonic resonance.
万方数据
维普
