Study On The Wind Power Supply For The Safety Monitoring Of Freight Trains

On the background of rapid transit, heavy haul and specialization of China railway freight, the railway transportation safety has become an increasingly prominent problem, derail accidents for instance. Without power for its trailer, the freight train cannot carry safety monitoring equipments onboard just like the passenger train to obtain real-time data of every performance index when it is running. In order to improve the safety, some research on the wind power supply for the safety monitoring of freight train is done in this paper.Firstly, with some analysis of the research status of freight train safety monitoring, this paper describes the application of wind power generation technology into the railway freight, and the key technology of wind power system is discussed as also.Secondly, an experimental platform of wind power generator was set up, with which the output power characteristics of the generator under different wind velocity and load are studied.Thirdly, based on the study of the demand for electricity of freight train safety monitoring equipments, an overall design scheme of the wind power system was put forward. And with the improved traditional power feedback method, the MPPT model for a small wind power system is built.Lastly, parameter calculation and component selection of the hardware circuit of the system is done, as well as the debugging of the main circuit. And the program which can achieve data acquisition and the generation of PWM signal is also debugged on the development board.Through research on the wind power supply design, several conclusions are reached: First, simulation analysis shows that the MPPT control of wind power can be achieved by the improved power feedback method; Second, based on the test data, a fitting curve and a fitting function of the optimal point of power applied on the wind power generator is obtained; Third, the hardware circuit can realize the functions which are in requirement. Fourth, A/D sampling as well as the generation of PWM signal can be achieved by the software program.