Flexible traction power supply system and energy coordination control method thereof

Abstract

The invention discloses a flexible traction power supply system and an energy coordination control method thereof. The system comprises a multi-port energy router and a traction network which are connected in sequence, the multi-port energy router is connected with three-phase power systems of different voltage levels and converts input electric energy, and different ports respectively output single-phase alternating current to supply power to a traction network and three-phase alternating current to supply power to power distribution equipment of the multi-port energy router. The traction network is used for supplying power to the locomotive. According to the flexible traction power supply system provided by the invention, the multi-port energy router is introduced, so that the whole railway line run-through is realized, the electric split-phase is thoroughly cancelled, the input energy can be randomly converted through the multi-port energy router, the energy is supplied to the traction network and the internal power, the energy can be saved, and the energy utilization rate can be improved.

Description

technical field [0001] The invention belongs to the technical field of traction power supply, and in particular relates to a flexible traction power supply system and an energy coordination control method thereof. Background technique [0002] At present, the existing electrified railway traction power supply systems at home and abroad basically adopt the three-phase-two-phase (out-of-phase) power supply mode. The substation takes power from the three-phase grid through the traction transformer and steps it down, and then outputs it in two power supply arms to supply power for the traction grid. Since the voltage phase, amplitude and frequency of the power supply arms are difficult to be completely consistent, it is necessary to set up electrical phase separation between the power supply arms. With the rapid development of high-speed railways and heavy-duty railways in recent years, the following problems will become more prominent: [0003] (1) Power quality problem: The ...

AI Technical Summary

Problems solved by technology

[0003](1) Power quality problem: The single-phase load of the existing traction power supply system will be reflected to the three-phase grid, which will generate negative sequence current, resulting in unbalanced three-phase voltage, high-speed heavy The increase of the traction power of the loaded train makes the negative sequence problem more prominent, and at the same time, it will also cause problems such as reactive power and harmonics

(2) Over-current phase separation problem: there must be electric phase separation in the existing traction power supply system, and the electric phase separation device has a complex structure and low reliability, which is the weak link and accident-prone point of the traction power supply system

(3) Power supply capacity problem: Due to the existence of electric phase separation devices, it is difficult to realize energy interconnection and cross-regional power supply between existing traction substations. Therefore, at present, traction transformers in each existing traction substation need to be installed One main and one backup, the capacity of the traction transformer is difficult to be fully utilized, which limits its power supply capacity

(4) Difficult access to new energy sources: The current structure of the existing traction power supply system determines that it is difficult to access new energy sources and energy storage systems

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