Eliability Analysis On The Traction Power Supply System

With the development of the social economy and the growth of the urban traffic, urban rail transit systems plays more and more important in urban development and people daily life, power supply system offers the current source to it, if current supply breaks, not only transport of urban rail transit interrupts, but also damages people's life and property. So the analysis of the reliability of traction power supply system is becoming more important.First, the thesis emphasis on the reliability analysis of the traction power supply system. Against the self characteristic of traction power supply system and definition of reliability, the concept of traction power supply system reliability of subway is discussed. Traction power supply system is divided into three levels in this thesis , which is traction substations, catenary system, the traction power supply system of a certain period, then carries out reliability modeling, generalizes evaluation index system and sensitivity index of the traction power supply system. The thesis applies the network model analysis on the basis of feeder partitioning and fault tree method for reliability assessment of the traction substation, apply reliability block diagram analysis and fault tree method for reliability assessment of the catenary system, the equivalent reliability model is given. For the failure data of the traction power supply system of Guangzhou metro line 1 in the year 2003 and 2004 as an example, the reliability index of this line is calculated, qualitatively analyze the traction power supply system of weak links by comparing the components of the sensitivity of each device. The analysis of the results of the example shows that the reliability of established methods to assess good accuracy.Secondly, this thesis researches the methods of reliability allocation for the subway traction power supply system. Propose the process and suggestion to the reliability allocation of the subway traction power supply system, and gives examples of analysis and proposes the measures of improving the reliability of subway traction power supply system.Finaly, this thesis completes a part of the function of the software of the reliability evaluation of the subway traction power supply system using C language based on the methods of reliability evaluation which has been chosen. The software can complete the function of building the model of fault tree of the subway traction power supply system, and make the qualitative and quantitative analysis according to the model of fault tree.This thesis reaserches of the principles and characteristics the subway traction power supply system , combines with the methods of reliability evaluation and allocation, proposes the methods of reliability evaluation and allocation for the subway traction power supply system, gives examples of these methods and proves the advantage and practicality of modeling analysis by the method of layered and block, combining with the characteristics of all parts of the traction power supply system, and demonstrates that reliability allocation is necessary for the initial of subway design.