Rail transit power supply system twin coil access medium-voltage energy feed system and method

A power supply system and double-coil technology, which is applied in the direction of electrical components, AC power input conversion to DC power output, climate change adaptation, etc., can solve the complex logic of feedback and energy absorption, increase equipment cost and floor space, and Affect equipment reliability and other issues, to achieve the effect of eliminating the impact of circulation, high cost, and balanced heat generation

Active Publication Date: 2016-01-06
NINGBO METRO GRP +1
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Problems solved by technology

This technical solution adopts adding one or more parallel DC/DC converter modules at the DC traction bus, so that the electric energy generated when the locomotive brakes can be partially fed back to the grid through the AC/DC module, and partly passed through the DC/DC module. After the voltage is boosted, it is stored in an indepen

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  • Rail transit power supply system twin coil access medium-voltage energy feed system and method
  • Rail transit power supply system twin coil access medium-voltage energy feed system and method
  • Rail transit power supply system twin coil access medium-voltage energy feed system and method

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Embodiment 2

[0060] Such as Figure 6 As shown, the urban rail power supply system double-coil access type medium voltage energy feed system of this embodiment and the first embodiment ( figure 1 As shown), the urban rail power supply system double-coil access type medium-voltage energy feed system of this embodiment is basically the same, and its main difference is: in Embodiment 1, the DC reactor L is connected in series with the DC of the inverter 22 Between the negative output terminal on the negative pole side and the DC bus bar of the DC traction network, it is specifically connected in series between the first negative switch QC1 and the negative pole of the DC bus bar of the DC traction network. The two energy feed branches share a DC reactor L, through The current of the DC reactor L is relatively large, resulting in a large volume and large heat generation of the DC reactor L. In this embodiment, the DC reactor L is connected in series between the positive output end of the DC s...

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Abstract

The invention discloses a rail transit power supply system twin coil access medium-voltage energy feed system and method. The system comprises a rectification transformer, a twin coil access energy feed device, and a rectification unit. The twin coil access energy feed device comprises two energy feed branches arranged in parallel. Each energy feed branch comprises an AC-side low-voltage breaker, an isolation transformer, an inverter, and a DC-side contactor which are successively arranged in series. The method comprises steps that current is acquired from a medium-voltage AC power grid and is supplied to a DC traction network by means of the rectification transformer and the rectification unit when a train is started; and the twin coil access energy feed device is started and train braking energy is fed back to the medium-voltage AC power grid via the twin coil access energy feed device and the rectification transformer when the train is braked. The system may achieve energy conservation and stable DC bus voltage, is good in flexibility, small in size, high in combination with a conventional system, high in power factor, low in harmonic injected into an AC side, and good in universality.

Description

technical field [0001] The invention relates to an urban rail power supply system, in particular to a double-coil connected medium-voltage energy feed system and an energy feed method for the urban rail power supply system. Background technique [0002] At present, in the urban rail traction power supply system, there are mainly two solutions for dealing with the regenerative energy generated when the train brakes. One is the low-voltage feedback + resistance consumption solution, which feeds the braking energy back to the low-voltage power distribution AC400V grid. The excess energy is consumed by the braking resistor. Because the capacity of the low-voltage distribution transformer is small, when the braking energy is large, most of the energy is consumed by the braking resistor, and the recycling rate of the regenerative energy is low; the other is The medium-voltage energy feedback scheme (independent branch type) is to feed back the braking energy to the medium-voltage ...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02J3/38
CPCY02A30/60
Inventor 赵勤王军平贺文徐金平陈广赞黄文昕张铁军蒋晓东杨树松李金华阮庆军朱纪法陈雪王正易韵岚孙才勤张玉平尹维恒王龙
Owner NINGBO METRO GRP
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