Power Flow Analysis And Dynamic Simulation Of AC Traction Power Supplysystem For Urban Rail Transit

The ac traction power supply system of urban rail transit can realize the full line power supply,which is very convenient for the utilization of regenerative braking energy and can avoid the influence of stray current on electrochemical corrosion.When the contact power supply device adopts the electric plough and the contact belt,the power supply capacity of the traction power supply system is greatly improved,and the number of traction stations can be greatly reduced to reduce the construction cost.The urban rail ac traction power supply system provides a better scheme for the development of urban rail transit and has a very broad application prospect.Therefore,it is necessary to comprehensively evaluate the voltage,power and other electrical information of the ac traction power supply system of urban rail transit,so as to provide further theoretical support for its application and promotion in engineering.Firstly,this paper introduces the technical scheme of ac traction power supply system of urban rail transit,from the structure of the cable traction supply network,gives the ac traction power supply system of urban rail transit construction method of equivalent impedance model,and according to the restricted by electric plough,contact zone conditions to analyze the equivalent parameters of the power supply rail and choice,ac traction power supply system of urban rail transit is established equivalent impedance model.Secondly,according to the requirements of dynamic simulation is proposed to build urban rail traffic ac traction power supply system of single load,full load dynamic model,the method of using alternating rectangular locomotive traction combining both the established urban rail transit lines of train diagrams of the ac traction power supply system of dynamic load model,and according to the dynamic load model of urban rail transit ac traction power supply system of regenerative braking energy utilization is analyzed,for the ac traction power supply system of urban rail transit is verified the advantages of regenerative braking energy use.Then,according to the structure characteristics of ac traction power supply system of urban rail transit are analyzed the current distribution rule of traction network,based on the current distribution law established the equivalent external power supply,linear relationship between the load voltage and load current,and gives the linear equations,linear equations of the equivalent impedance,the method of equivalent impedance matrix,linear equations,linear equations based algorithm is proposed to improve the tide,and USES the method of gaussian seidler,verifies the correctness of the improved flow algorithm.Finally,the dynamic load model and the improved power flow algorithm are used to simulate the urban rail ac traction power supply system.The voltage and power characteristics of the traction power supply system are analyzed through the simulation of a certain voltage grade and a traction power supply system distributed.The full load dynamic model is used to compare and analyze the electrical characteristics of the contact belt traction network and rigid catenary traction network,which proves the superiority of the contact belt traction network.The influence of voltage grade and traction number on the power supply system is briefly analyzed.the evaluation function is established according to the simulation results,and the optimal scheme of the contact belt traction network for the target line is solved.