Development Of Electromagnetic Vacuum Circuit Breaker Control System For Electric Locomotive

Electrified railways in China are developing vigorously.Electric locomotives are highly efficient,convenient and fast.They are attracting more and more attention.The demand for all kinds of electrical equipment surrounding the electric locomotive also increases greatly.The main circuit breaker of the electric locomotive assumes the opening and closing of the main power supply of 27.5kV.At the same time,when the locomotive has overcurrent or short circuit faults,the main circuit breaker can quickly break the main circuit and ensure the safety of the train operation.During the phase separation of electric locomotive,the main breaker must first switch and then switch on.Therefore,during the train operation,the main circuit breaker's operation will be very frequent,and its reliability will directly affect the safety and stability of the train.In this paper,the controller of the electric locomotive electromagnetic vacuum circuit breaker is developed in connection with the project of the enterprise.In addition,the reliability of the system and the storage of the real-time data are also considered in order to realize the basic control function of the main circuit breaker switching and closing of the electric locomotive.To this end,the following work is carried out in this paper.1)the design of the power circuit of the controller.On the basis of analyzing the working principle of the operating mechanism of the locomotive main circuit breaker,according to the energy needed for closing the closing coil,the energy storage capacitor charging circuit based on the double tube Buck-Boost converter is designed.The two different ways of the hysteresis current control and the current loop PI adjustment are used to realize the initial charge and the rising voltage of the energy storage capacitance respectively.Flow charge.2)the hardware design of the control system.The control system takes FPGA+ARM as the core control unit,and integrates the interface of ADC conversion,communication and data storage.The external circuit has control power,closing coil control circuit,keeping and degaussing coil control and other digital and analog circuits.In order to ensure the reliability of the control system,two way redundant design is adopted for the controller control power supply,energy storage capacitor charging circuit and Ethernet.3)software design of control system.Using the Quartus II as the development platform and using the Verilog hardware language to carry out the modular program design,mainly including the capacitor charging program module,the switch control program module and so on,which can complete the control of the main circuit breaker's switching,closing,keeping and demagnetization.At the same time,the software has the monitoring of the system,the fault detection and the pass through.Information and other functions.4)experimental test and joint debugging.In the laboratory,the experimental test on the output voltage,inductance current,charging time and temperature of the energy storage capacitor charging circuit is carried out.The test results show that the designed control system can meet the requirements of the constant current charging time for the energy storage capacitance,and the electromagnetic circuit breaker prototype is used on the project experimental platform.The test results show that the time of trip and closing is 30 ms and 100 ms respectively,and the charging time of energy storage capacitor is 1.6s,which meets the design requirements.Through three weeks of operation test,the control system works stably.