Computer Simulation And Assistant Decision-Making For Metro Traction Power Supply System

In recent years,China's rail transit industry has developed rapidly,passenger traffic has also risen sharply,and operation conditions are more complex,which puts forward higher requirements for the safe and stable operation of traction power supply system.The power supply system simulation software has been widely used in the design and operation of the intelligent power supply system,which has attracted more and more attention.This paper mainly studies the calculation method,puts forward the idea of assistant decision-making,completes the design of assistant decision-making database,and develops the computer simulation software.Firstly,the equivalent methods of AC and DC power supply equipment are deeply studied,and a mathematical model for power supply simulation calculation is established.In order to improve the simulation accuracy,the power source is used to describe the train load.The power flow calculation method and simulation steps of AC,DC and AC-DC combination in metro power supply system are designed.The train organization scheme with equal interval and dynamic tracking interval is realized,which improves the accuracy of simulation calculation and lays an algorithm foundation for software development.Then,guided by the needs,a assistant decision-making method of metro power supply management based on health assessment is proposed,which evaluates the operation status from reliability and economy.The design of evaluation principles,indicators and simulation steps has been completed,and the evaluation model based on AHP has been constructed.The operation status of metro power supply system has been visually displayed,which provides a theoretical method for the development of assistant decision-making function.Aiming at specific problems,the method and steps of assistant decision-making are designed,and the database is completed,which provides a technical path to relasize the function of software.The database is characterized by convenient data interaction and easy updating and expansion,which consists of method base,equipment parameter base and decision-making measure base.Among them,the method base stores the method for assistant decision-making,and the parameter base provides way to evaluate and upgrade equipment.The measure base matches and outputs specific decision-making measures through keyword matching.Finally,the structure and function design of the simulation and decision-making software for metro power supply system are completed,and the development is realized by using computer programming language.The software can support AC power supply calculation,DC power supply calculation and AC-DC joint calculation respectively,and can output auxiliary decision-making according to simulation calculation structure.It has been preliminarily applied in engineering practice.The mathematical model and simulation algorithm are compared and validated with the measured data,and the auxiliary decision-making module is tested.The results show that the software has complete functions and high accuracy,and can provide auxiliary management and technical support for power supply management and engineering design.