| With the process of urbanization and the continuous development of the city overall economy,people have higher requirements for improving living environment and traveling conditions.Urban rail transit plays an important role in the process of urbanization as a vehicle to guarantee people’s travel.As a transportation tool with large traffic volume,high reliability and green environmental protection,metro provides great convenience for people’s travel in the city.Traction power supply system,as the most important part of the metro power supply system,provides the electricity needed for the normal operation of the metro.There are always some emergencies of traction power supply system in the actual operation process.Once the traction power supply system face to a series of power supply problems such as power outage,it will run for the whole metro lines have serious consequences which produce certain economic loss,even endanger passengers and surrounding masses’ life safety.Therefore,it is one of the important issues to evaluate the reliability of the whole traction power supply system.At first,this thesis was mainly introduced the metro traction power supply system reliability evaluation methods in detail,gave in the traction power supply system evaluation index system,analyzed the supply system reliability,and combined metro traction power supply system structural characteristics with its operation mode,established the traction power supply system reliability model and the actual operation situation equipment failure model.According to its reliability characteristics and the definition of reliability index,the corresponding system reliability index is obtained.In this paper,the reliability model of traction power supply system is established based on Power Factory simulation software,and the overall system reliability index is analyzed by the system equipment fault model,so to obtain the overall reliability parameters of the system.In addition,taking the fault parameters of a city’s subway line as an example,it’s corresponding system reliability index parameters of the line model are calculated and analyze,and the yearly fault situation is calculated and evaluated comprehensively.Secondly,based on different fault conditions in the practical engineering system,this thesis proposed a kind of integrated reliability evaluation method for metro traction power supply system.The method analyzed its reliability index in the different fault scenarios,converted the single reliability evaluation index method to multi-index comprehensive evaluation way,and sorted its reliability index results by the reliability index in different fault scenarios synthetically.Through its reliability sorted result to analysis the impact of equipment failure degree on the overall system reliability,and verified the reliability and effectiveness of the method by examples.Finally,through the research on the principle and method of reliability distribution,this thesis comprehensively considered a variety of reliability distribution methods applied to the structural characteristics of TPSS,and put forward the analysis process and application of the corresponding reliability distribution methods.In addition,as a simplified model of urban metro TPSS an example,this thesis researched the feasibility of the reliability allocation method based on expected value,and it can according to the actual need to verify the TPSS reliability for the reasonable allocation to achieve the overall system reliability and to improve reliability in the design planning purposes.This example shows that it is necessary to allocate the reliability reasonably in the early stage of the system design,and it also provides the corresponding theoretical basis for the reliability design of the subway TPSS in the future. |
