Research On Condition Monitoring Of Composite Power Energy Storage System For Contactless Powered Urban Rail Vehicles

In recent years,with the increase of the population,the size of cities is continuing to expand,which is placing higher requirements on urban infrastructure construction,and also promoting the rapid development of urban rail transit vehicles.Traditional catenary vehicles need to set up a catenary,which has a certain impact on the city's beauty and even safety.Therefore,non-contact power supply urban rail vehicles came into being.A hybrid power storage system composed of a lithium-ion battery and a supercapacitor makes up for the shortcomings of using a single energy storage element,and the two complement each other.In order to ensure the safe,reliable and efficient operation of trains,real-time monitoring of energy storage systems is necessary.This thesis is based on the national key R & D plan " Quality Inspection,Monitoring,and Maintenance of New Energy-Saving Power Supply Vehicles and Their Vehicle-mounted Energy Storage Technology for Urban Rail Transit ",a vehicle-mounted composite power storage system is used as the research object to design a set of contactless power urban rail vehicle composite power storage monitoring system.This thesis studies the contactless power supply of urban rail vehicle composite power storage monitoring system mainly.According to the operating characteristics of the vehicle-mounted composite power storage system,the specific functions required for the vehicle monitoring system are determined firstly.Aiming at the functions and characteristics of the energy storage monitoring system,a composite power storage monitoring system using a master-slave topology is designed,that is,the composite power storage monitoring system is composed of a master control module and a slave control module.The master control module and the slave control module undertake different tasks respectively.The master control module uses the Controller Area Network(CAN)to communicate with the slave control module and the vehicle monitoring system.It also adopts certain safety protection measures to avoid safety accidents in the hybrid power storage system,which affects the safe operation of the vehicle.The thesis designs the hardware circuit and software of the monitoring system in detail,and adopts mature chips on the market to improve the integration and reliability of the entire hybrid power storage monitoring system.STM32F407ZGT6 was selected as the core chip of the main control module,and a single-voltage monitoring circuit for the composite energy storage system based on LTC6811-1 and a single-voltage active equalization control circuit based on LTC3300-1 were designed.The combination of modularization and layering is used to improve the efficiency of software design,shorten its running time,and ensure the reliable and efficient operation of the monitoring system.Finally,the performance of the monitoring system was tested in the laboratory by simulating the actual working conditions.The voltages of the lithium batteries and supercapacitor units under static conditions were tested,and the accuracy of temperature acquisition and current detection in the monitoring system were measured.In addition to the test,the balance control of the lithium battery that is about to fail is performed to verify the monitoring accuracy and balance control effect of the system.The results show that the system can run safely and smoothly,and the monitoring accuracy and balanced control effects can meet the requirements for the use of the composite power storage monitoring system(voltage monitoring error range is ±0.6%,current monitoring error range is ±0.5%,temperature monitoring error range is ± 0.5 ?),which verifies the accuracy of the composite power storage monitoring system in this thesis.