Development And Design Of Train Traction Control Unit

As a key component element in high-speed railway vehicle and controlled by Traction Control Unit(TCU), traction and transmission system is intended to the safety and stability of vehicle operation. With the function of controlling, the traction and transmission system monitoring and the Train Communication Network(TCN) communication, TCU is a multifunction and key equipment in the traction control system. However, along with the fast development of high-speed rail, China can provide most equipments of railway vehicle except a few central equipment, such as TCU, which can be manufactured without developed and updated in our country. It’s significant to research and design the software and hardware of TCU.The signals that TCU processed are from sensors and operation devices in Traction and Transmission System, which can be classified into two sets. One is monitoring signals which are used to monitoring the condition of Traction and Transmission System. The other is controlling signals for control the system operation. TCU has to exchange data while in motion. According to the type of the exchanged data, TCU communicate with other equipments via Multifunction Vehicle Bus (MVB), internal data exchanging via Compact PCI (CPCI) Consequently, it’s necessary to design corresponding sub-block dealing with different signals and exchanging data via various buses. Controlling sub-board, analog signals processing sub-board and digital signals processing sub-board make up for controlling sub-block implement to control Traction and Transmission System. System monitoring sub-board and safety auxiliary sub-board make up of monitoring sub-block implement monitoring. Network communicating sub-board provide MVB interface for communication. DC24V powering sub-board and CPCI powering sub-board provide power supply to TCU. ALL sub-boards connect together with backplane, and assembly to 4U chassis make up of TCU hardware system. Besides, implementing grounding and shielding techniques make sure safety and stability when TCU works in intense magnetic field.The simulation model of Traction and Transmission System in RT-LAB make up of AC-link model and motor side model. AC-side model contains four-quadrant pulse converter, DC side circuit. And motor side model contains traction inverter and three-phase asynchronous motor. Hardware in the loop experiment system is constructed with TCU and RT-LAB simulator could be applied to design and develop control algorithm in TCU which four-quadrant pulse converter using transient current control, motor side using vector control and SVPWM algorithm. The laboratory findings show that the TCU this thesis designed could control four-quadrant pulse converter working in unity power factor while provide a stabilizing DC side voltage. And definitely the motor has a smooth start and a stable speed.Besides, testing the software and hardware of the TCU with 11Ok VA Traction and Transmission experiment platform, experiment results far more proof the TCU could work stable in high-power application environment. It can provide a reference for TCU engineering and develop an equipment platform for further research of controlling technology in traction and transmission system.