Uninterruptible Power Supply for EMUs

The key modules of the EMU auxiliary power supply system mainly include auxiliary converters, chargers, batteries and related loads. The topology of the auxiliary power supply system is shown in Figure 2. Figure 2. Topology diagram of the EMU auxiliary power supply system.

To avert possible data loss, computer systems need uninterruptible power supplies (UPS). An uninterruptible power supply provides a stable power supply to the system in the presence/absence of the input supply and uses an inverter to convert DC to AC power.

DC load mainly includes battery pack, single-phase inverter and electric lamp. DC equipment is taken from the DC 110 V power bus. The working control logic of the EMU auxiliary power supply system is as follows: firstly, the bus voltage of the 3000 V DC link is started, and then an auxiliary converter (main auxiliary) is started.

The experimental platform of China Standard EMU auxiliary power supply system is shown in Figure 19. The main components are: auxiliary converter, charger and vehicle single-phase inverter. The system is bulky and was placed in the open air, and the control section was placed indoors. Figure 19.

High-speed EMU technology combines various complex technologies and the auxiliary power supply system is an important part of the EMU. It not only supplies power to all load devices outside the traction power system that need to be powered, but also ensures the normal operation of some parts of the EMU, which facilitates people's lives and travel.

According to Figure 12, the simulation model of the Chinese standard EMU auxiliary power supply system is built on the MATLAB/Simulink platform, which is shown in Figure 13. The simulation parameters are shown in Table 3. Figure 12. Diagram of the overall connection of the auxiliary power supply system. Figure 13.