Rail traction power grid power supply voltage stabilization, recovery and reutilization energy storage system

Abstract

The invention belongs to the field of rail traction power grid control, particularly relates to a rail traction power grid power supply voltage stabilization, recovery and reutilization energy storage system and method, and aims to solve the problem that power supply voltage stabilization, recovery and reutilization cannot be realized quickly and stably during traction / braking of a traction vehicle in the prior art. The rail traction power grid power supply voltage stabilization, recovery and reutilization energy storage system comprises a power supply inversion unit, a monitoring control unit and a BMS energy storage unit, wherein the power supply inversion unit carries out voltage conversion of a commercial power supply, an electric energy recovery power supply and a BMS energy storage unit power supply; the monitoring control unit is used for monitoring peak shifting performance, harmonic and commercial power supply quality of a traction power grid in real time, and sending a command for starting the BMS energy storage unit to supply power or charge when the voltage of the traction power grid is smaller than a lower limit threshold value or the commercial power voltage is 0 / the voltage of the traction power grid is larger than a set upper limit threshold value; and the BMS energy storage unit is used for receiving the command of the monitoring control unit and discharging / charging an energy storage battery. According to the rail traction power grid power supply voltage stabilization, recovery and reutilization energy storage system, power supply voltage stabilization, recovery and reutilization of the traction power grid can be rapidly and stably realized.

Description

technical field [0001] The invention belongs to the field of rail traction power grid control, and in particular relates to a rail traction power grid power supply voltage stabilization, recovery and reuse energy storage system. Background technique [0002] At present, the 750-volt DC power supply system mainly used in my country supplies power to rail transit, but most of the rail transit power supply systems use uncontrolled rectification, which has soft characteristics. When there are too many rail transit vehicles and they are in the traction state, the bus voltage of the power supply system will be greatly lowered. The electric vehicle continues to run, and the voltage of the catenary connected to the locomotive will increase during this process, even exceeding the set upper limit. [0003] Therefore, in order to ensure that the grid voltage is controlled within a certain safe range, and the catenary voltage rises without affecting the grid, some vehicles now adopt th...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, that is, the problem that the existing rail transit power supply system cannot quickly and stably realize the voltage stabilization, recovery and reuse of the traction power grid power supply when the traction vehicle is pulling / braking, the present invention provides a Rail traction power grid power supply voltage stabilization, recovery, reuse energy storage system, the system includes the following units:

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