Research And Design Of Double System Power Supply Device For Railway Freight Wagons

With the rapid growth of China’s economy and the improvement of scientific and technological innovation capabilities,railway freight wagons have gradually been transformed and upgraded in the direction of heavy-load,faster,safety,intelligence and information.In order to solve the increasingly prominent operational safety problems of railway freight wagons and the requirements for the implementation of the information management for freight wagons in the future,it is a general trend to use intelligent monitoring equipment to monitor and control freight wagons in real time.However,the operation and maintenance system is different for railway freight wagons and passenger trains.The power supply devices are basically not installed in freight wagons,and the carriages are frequently demounted and reassembled during transportation,which results in the lack of monitoring of railway freight wagons.The power supply technology applicable to railway freight wagons has always been a problem that needs to be solved urgently.Therefore,this thesis proposes an overall design scheme for the power supply device of railway freight wagons.Firstly,this thesis analyzes and summarizes the relevant technological developments of domestic and foreign power supply device for railway freight wagons,and demonstrates the power supply methods of existing railway freight wagons and passenger trains.The operational principles,compositional framework and functional analysis of various systems are described in detail.By comparing various power supply schemes,the double system mode of axle end power supply and wind power supply is determined,and it is combined with battery energy storage system to achieve sustainable power supply.Then,the overall design scheme of the double system power supply device is planned,focusing on the design of the two-mode deployment scheme for the axle power supply and wind power supply.The improvement scheme and new design method of the axle end generator are described in detail,and the design framework,maximum wind energy utilization rate and the optimal power curve of the wind turbine in the wind energy collection and power generation device are analyzed.Then the lithium ion battery energy storage system,the structure and program flow chart of power supply device control system are analyzed.In addition,the hardware circuit of the double system power supply device is designed,and the STM32F103 MCU is used as the main controller.The structure diagram of the rectifier circuit,buck circuit,voltage regulator circuit,inverter circuit,detection circuit,energy-consuming load control circuit and the equivalent circuit diagram of the power supply device to provide electrical energy are designed in detail.Finally,the simulink simulation model is established for the mechanical system and the whole system of the wind power supply device,and the corresponding simulation values are set up to carry out the simulation test.By analyzing the experimental model of the axle power supply and wind power supply,the power quality output by the power supply device at different engine speed and different wind speed is obtained.The simulation and experimental results demonstrate that the overall design scheme of the double system power supply device is reasonable,and it achieves the expected design goals.The device can independently provide stable electric energy for the intelligent monitoring equipment of railway freight wagons,greatly improve the operational safety performance of railway freight wagons,and promote the sustainable and healthy development of railway freight transportation in China.It possesses very broad application prospects in the field of railway power supply.