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A modular subway energy feedback device based on series and parallel structures

An energy feedback and modularization technology, which is applied in the direction of output power conversion device, climate change adaptation, irreversible DC power input conversion to AC power output, etc., can solve the problem of not being able to flexibly cover different current levels and meet power requirements flexibly. Level requirements, no redundant operation capabilities, etc., to achieve the effect of ensuring realizability, reducing size, and small amplitude

Active Publication Date: 2018-11-09
NANJING APAITEK TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is not compatible with DC750 / 1500V applications, and it also cannot flexibly cover the needs of different current levels
[0006] In summary, the above two solutions cannot flexibly meet the needs of various power levels, and there is no redundant operation capability, which has potential reliability risks

Method used

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  • A modular subway energy feedback device based on series and parallel structures
  • A modular subway energy feedback device based on series and parallel structures

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033] There is only one DC750V inverter module group in the circuit. At this time, the voltage measured by the DC network is 750V. Inside the inverter module group, a certain number of DC750V inverter modules can be connected in parallel according to the actual current.

Embodiment approach 2

[0035] There are two groups of DC750V inverter modules in the circuit, and the two groups of inverter modules are connected in series. At this time, the shared voltage is 1500V. If one inverter module in each group cannot meet the current requirements, a certain number of inverter modules are connected in parallel according to the magnitude of the current. DC750V inverter module.

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Abstract

The present invention specifically relates to a modular subway energy feedback device. In order to overcome the shortcomings of the prior art that cannot flexibly meet the needs of various power levels, the present invention adopts a modular subway energy feedback device based on a series and parallel structure. The device includes: at least one DC750V inverter module group and a step-up transformer; the electric energy fed into the DC catenary enters the DC side of the DC750V inverter module through a voltage transformer, and the DC power is converted into low-voltage alternating current through the DC750V inverter module, and the low-voltage alternating current The DC750V inverter module group includes at least one DC750V inverter module, and the AC output terminal of the DC750V inverter module is connected to the step-up transformer. The invention can flexibly cover the voltage of DC750 or 1500V and the requirements of different current levels, and can run redundantly and improve reliability.

Description

technical field [0001] The invention relates to the technical field of urban rail transit power supply systems, in particular to a modularized subway energy feedback device. Background technique [0002] In recent years, my country's urban rail transit has developed very rapidly. The existing subway traction power supply method uses a diode rectifier unit to rectify 35 / 33kV medium-voltage AC power into 1500V DC, and supplies power to the traction motor on the subway train through the DC catenary. However, this power supply method can only realize the one-way power flow of electric energy from the grid to the motor, and the motor works in the generator state during the braking process, and the mechanical energy of the train is converted into electric energy. In order to ensure that the DC catenary voltage is within the safe range, the electric energy generated by train braking is basically absorbed by the resistance power consumption method, which causes a great waste of elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/49
CPCH02J3/38H02M7/49H02M7/4835Y02A30/60
Inventor 仇志凌芮国强李锦胡磊磊张明许忠元陈蕾刘定坤葛文海
Owner NANJING APAITEK TECH
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