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Method and device for recovering mixed regenerative energy of urban railway power supply system

A technology of regenerative energy and power supply system, which is applied in the direction of circuit devices, DC network circuit devices, and adjustment of electric variables, etc., and can solve the problems of regenerative braking energy that cannot be consumed, complex structure, and rapid lift.

Active Publication Date: 2015-02-04
重庆中车时代电气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing urban rail energy recovery system, when the AC side fails, the hybrid energy recovery device needs braking resistors or supercapacitors to consume or store excess regenerative braking energy, and both braking resistors and supercapacitors need Connected to the DC side busbar through a chopper module, which will increase the cost of the system
The structure of the hybrid energy recovery device is more complicated than that of the conventional energy feedback device, and the control is relatively complicated
The conventional energy feedback power supply system takes measures to disconnect the energy feedback device to protect the equipment, which will cause the excess regenerative braking energy to be unable to be consumed, and the DC side network voltage will rise rapidly, seriously affecting the safe and stable operation of the urban rail system

Method used

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  • Method and device for recovering mixed regenerative energy of urban railway power supply system
  • Method and device for recovering mixed regenerative energy of urban railway power supply system
  • Method and device for recovering mixed regenerative energy of urban railway power supply system

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Embodiment 1

[0039] Such as figure 1 As shown, the hybrid regenerative energy recovery method used in the urban rail power supply system in this embodiment includes the following steps: in the urban rail running state, detect the fault state of the AC power grid, and if the AC power grid is normal, enter the energy when the train brakes In the feedback mode, in the energy feedback mode, the regenerative braking energy output by the DC grid of the urban rail traction power supply system is converted into AC power through the regenerative converter, and then converted into AC power of a specified voltage through the regenerative transformer, and then fed back to the AC grid ( Such as AC400V, AC 35kV, AC10kV and other AC grids); if the AC grid fails, disconnect the path between the energy-feeding converter and the AC grid, and enter the energy absorption mode when the train is braking. The energy-fed converter is used as a chopper or a bidirectional DC / DC chopper to convert the regenerative b...

Embodiment 2

[0067] This embodiment is basically the same as the first embodiment, and the main difference lies in the way of absorbing the regenerative braking energy and the structure.

[0068] Such as Figure 7 As shown, in this embodiment, the energy absorbing component is a supercapacitor C2, the positive pole of the supercapacitor C2 is connected to the corresponding phase line on the AC side of the energy-feeding converter through the energy absorbing branch switch K2, and the negative pole is connected through a normally closed DC feedback The switch K4 is connected to the negative pole of the DC grid of the urban rail traction power supply system, and the supercapacitor C2 is also connected in parallel with a capacitor discharge circuit formed by a discharge resistor R2 and a normally open discharge switch K3 connected in series. Therefore, in this embodiment, absorbing through an energy absorbing component specifically refers to absorbing through a supercapacitor. The discharge ...

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Abstract

The invention discloses a method and a device for recovering mixed regenerative energy of an urban railway power supply system. The method comprises the steps of determining an energy feedback / absorption mode according to the AC power grid failure state, controlling an energy feedback converter to feed regenerative brake energy back to the AC power grid in the energy feedback mode, and converting regenerative brake energy into direct-current low-voltage electricity to be absorbed by an energy absorption component in the energy absorption mode. The device comprises a direct-current disconnecting switch unit, an energy feedback transformer, a converter control unit and at least one converter unit. Each of the at least one converter unit comprises the energy feedback converter, an energy feedback branch switch K1, an energy absorption branch switch K2 and three energy absorption components. By means of the method and the device, regenerative brake energy is absorbed by the energy absorption component during the failure of the AC power grid to maintain the stability of the DC power grid voltage, and the connection between the energy recovery device and the DC power grid is not needed to be cut off, so that the safe reliability of the energy recovery device is improved, the structure of a chopper can be omitted, and costs are saved.

Description

technical field [0001] The invention relates to an urban rail energy recovery technology of an urban rail transit system, in particular to a hybrid regenerative energy recovery method and device for an urban rail power supply system. Background technique [0002] The regenerative braking energy of urban rail transit (when the train brakes, the kinetic energy of the train is converted and reused instead of heat energy) is considerable, about 30% of the traction energy, except that part of the energy is absorbed by the auxiliary power supply system, the excess Energy is absorbed or re-used via regenerative braking. At present, regenerative braking energy utilization devices can be divided into three categories: energy absorption devices, energy storage devices, and energy feedback (transform the motor working condition of the traction motor into the generator working condition, convert the kinetic energy of the train into electric energy, and the electric energy passes through...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J1/00H02M7/5387H02M3/155
CPCH02J3/32H02J3/38H02M1/34
Inventor 张铁军贺文翁星方陈雪陈广赞刘海涛袁超张玉平谢湘剑张瑜周立明刘钢陈文姣
Owner 重庆中车时代电气技术有限公司
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