Energy storage device of urban rail power supply system and control method of energy storage device

Abstract

The invention discloses an energy storage device of an urban rail power supply system. The energy storage device comprises a high-voltage interface module, a converter module, a low-voltage interfacemodule and an energy storage module which are sequentially connected in series, and further comprises a control module, wherein the input end of the high-voltage interface module is connected with a direct-current traction network of the urban rail power supply system; the converter module comprises a plurality of bidirectional conversion power units which are connected in parallel; and the control module is connected with the high-voltage interface module, the converter module, the low-voltage interface module and the energy storage module, and charging or discharging of the energy storage module is achieved through the high-voltage interface module, the converter module and the low-voltage interface module. The invention further discloses a control method of the energy storage device ofthe urban rail power supply system. By means of the plurality of parallel bidirectional conversion power units, when one or more bidirectional conversion power units fail, the failed bidirectional conversion power unit is cut off, the reference bidirectional conversion power unit is determined again, and the phase shift angles of the other bidirectional conversion power units are adjusted, so thatthe operation reliability and stability of device are improved.

Description

technical field [0001] The invention relates to the technical field of rail transit power supply, in particular to an energy storage device for an urban rail power supply system and a control method thereof. Background technique [0002] Urban rail transit power supply systems generally use diode rectifiers as the power supply. Due to the characteristics of rectifier unit energy flow in one direction, there are problems such as large voltage fluctuations in the DC traction network and the inability to absorb and utilize the regenerative braking energy of trains. At present, a more mature solution is to use a rectifier unit + an inverter energy feedback device, that is, when the train brakes, the braking energy is inverted and fed back to the AC grid. However, the inverter type energy feedback device is an impact load for the AC power grid. On the one hand, there may be a situation where the electric energy is sent back to the main station when the power load is low; The imp...

AI Technical Summary

Problems solved by technology

However, the inverter type energy feedback device is an impact load for the AC power grid. On the one hand, there may be a situation where the electric energy is sent back to the main station when the power load is low; impact on the power grid, affecting the power quality of the AC ring network

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