Traction power supply system and energy feedback device thereof

Abstract

The invention discloses an energy feedback device of a traction power supply system. The input end of a single-phase inverter is connected to a direct current bus of a traction power supply system, the output end of the single-phase inverter is connected to the primary side of a high-frequency transformer, and the single-phase inverter is used for performing single phase inversion on the direct current in the direct current bus to output; the secondary side of the high-frequency transformer is connected to the input end of a rectifier, and the high-frequency transformer is used for performingtransformation on received signals to output; the output end of the rectifier is connected to the input end of a three-phase inverter, and the rectifier is used for performing rectification on the received signals to output; and the output end of the three-phase inverter is connected to the secondary side of a traction transformer of the traction power supply system, and the three-phase inverter is used for performing three phase inversion on the received signals to output so that energy feedback can be realized. Through the utilization of the lightweight and miniaturized high-frequency transformer, convenient construction and installation can be achieved, the formation of circulation can be avoided, and therefore, energy utilization efficiency can be enhanced. The traction power supply system including the energy feedback device is also provided, and has the same above beneficial effects.

Description

technical field [0001] The present application relates to the technical field of traction power supply, in particular to a traction power supply system and an energy feedback device thereof. Background technique [0002] With the technological progress in the power system of rail transit such as subways, energy feedback technology has begun to appear and be used. When the train is running, the traction power supply system provides normal power supply to the train, and when the train brakes, by starting the energy feedback device of the traction power supply system, the electric energy generated by braking can be fed back to the grid to realize energy saving. [0003] Generally, the traction power supply system of a train uses a traction transformer-diode rectifier unit to supply power to the train. Such as figure 1 As shown, the primary side of the traction transformer is connected to the AC bus, that is, it is connected to the AC power grid, and the secondary side is conn...

AI Technical Summary

Problems solved by technology

Because the power frequency transformer itself is large and heavy, it is inconvenient to install, which brings great pressure to the construction design of rail transit

There is also an energy feedback device in the prior art, the inverter is connected in parallel on both sides of the diode rectifier unit, and the original traction transformer is used to feed back the inverted AC power to the grid; however, this energy feedback device will A circulating current is formed in the loop formed with the diode rectifier unit, reducing the energy utilization efficiency of the entire traction power supply system

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