Research On Health State Assessment Of Rail Transit Power Supply System

In recent years,with the gradual acceleration of my country’s modernization process,the scale of urban rail transit has become larger and larger along with the process of urbanization.Nowadays,all large and medium-sized cities in my country are basically building or preparing to build rail transit systems.Rail transit has become an important factor affecting city image and economic development.Rail transit failure will seriously affect the normal travel of urban residents,and even cause huge accidents and economic losses.As the power source,the power supply system has an important impact on rail transit,and the assessment of its health status can take countermeasures in advance and effectively reduce the occurrence of operational failures.This paper takes the power supply system of a subway line in Shanghai as the research object,makes a systematic introduction to its structure and functions,analyzes the factors that affect the normal operation of the power supply system,and explains its health level,and establishes a health evaluation model on this basis Established an evaluation index system based on the Analytic Hierarchy Process(AHP)principle and applied it in conjunction with operating data during a certain period of 2019.The main achievements of the paper are as follows:(1)Established a power supply system health evaluation model based on analytic hierarchy process.The analysis is carried out from three main aspects: equipment operation characteristics,human maintenance plan,and environmental influence factors.Combining the structural characteristics of the power supply system,a detailed introduction to the characteristics of the indicators is made,and a scientific,reasonable and practical health assessment system is constructed.The improved analytic hierarchy process and the index correlation method are used to determine the comprehensive weight of the evaluation factors,and the calculation is carried out using the principle of fuzzy mathematics.(2)The health status of the transformer in the power supply system was evaluated.An index system including 5 first-level influencing factors,9 second-level influencing factors,and 16 third-level parameters including operating conditions,state characteristics,and storage of key facilities and equipment has been established.Through calculation,the weight ratio of each indicator in the system to which it belongs is clarified.The classic fuzzy membership distribution:model benefit fuzzy distribution and cost fuzzy distribution are studied,and the membership of each index parameter on different health levels is discussed,and a suitable membership model is matched for other facilities in the power supply system.The evaluation of the equipment provides a reference.