Co-rectifier transformer medium voltage type regenerative braking energy feedback device and control method thereof

A rectifier transformer and regenerative braking technology, which is applied in electric braking system, output power conversion device, AC power input conversion to DC power output, etc., can solve the problem of reducing the efficiency of system feedback energy, complex system circuits, and Complicated problems, to achieve the effect of eliminating circulating current, increasing feedback capacity, and reducing current harmonic content

Inactive Publication Date: 2018-01-09
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain disadvantages in the existing solutions of the above-mentioned medium-voltage regenerative energy feedback device sharing the rectifier transformer
Prior art 1: A bidirectional DC-DC converter is added between the PWM rectifier unit and the diode rectifier unit, the system circuit is complicated, the control system is complicated, and the investment cost is high
The second existing technology is that the converter unit is directly connected in parallel with the diode rectifier and connected to the secondary side of the rectifier transformer. This solution does not have an isolation transformer, which reduces the equipment size and floor space. A circulating current will be generated between the rectifiers, which reduces the efficiency of the system's energy feedback

Method used

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  • Co-rectifier transformer medium voltage type regenerative braking energy feedback device and control method thereof
  • Co-rectifier transformer medium voltage type regenerative braking energy feedback device and control method thereof
  • Co-rectifier transformer medium voltage type regenerative braking energy feedback device and control method thereof

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Embodiment 1

[0039] like figure 1 As shown, the co-rectifier transformer medium-voltage regenerative braking energy feedback device of this embodiment includes a rectifier transformer 1, an energy feedback unit 2 and a rectifier unit 3, and the energy feedback unit 2 and the rectifier unit 3 are arranged in parallel on the valve side of the rectifier transformer 1 Between the winding and the DC traction network, the grid-side winding of the rectifier transformer 1 is connected to the medium-voltage AC grid, and the grid-connected switch 4 and the isolation transformer 5 (isolated Transformer 5 matches the valve-side winding phase of rectifier transformer 1, that is, it is consistent with the valve-side winding phase of rectifier transformer 1), energy feed unit 2 includes two inverters 21, and the AC sides of the two inverters 21 are connected in parallel , the DC sides of the two inverters 21 are provided with a single-pole double-ended isolating switch group 22 for connecting the two inv...

Embodiment 2

[0065] like image 3 As shown, the co-rectification transformer medium-voltage regenerative braking energy feedback device of this embodiment is basically the same as that of Embodiment 1, and the difference is that in Embodiment 1, the three first current-sharing reactors Lj1 are separately set, which will reduce the isolation The volume of the transformer 5, but will increase the volume of the converter cabinet where the inverter 21 is located; Figure 7 As shown, in this embodiment, three first current-sharing reactors Lj1 are integrated and arranged in the isolation transformer 5 (not shown in the figure), so that part of the reactors in the LCL filter 6 are integrated in the isolation transformer 5 , which reduces the volume and cost of a reactor, and reduces the occupied area, but the volume of the isolation transformer 5 will increase relatively.

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Abstract

The invention discloses a co-rectifier transformer medium voltage type regenerative braking energy feedback device and a control method thereof; the feedback device comprises a rectifier transformer,an energy feedback unit, and a rectifier unit; a grid connected switch and an isolation transformer are respectively connected in series between the energy feedback unit and a rectifier transformer valve side winding; the energy feedback unit comprises two inverters; DC sides of the two inverters are provided with a single-knife-double-end isolation switch block; the DC sides of the two invertersare connected with a DC traction network through the single-knife-double-end isolation switch block; the feedback device control method comprises the following steps: starting, running and stopping the energy feedback unit according to a first startup threshold value, a second startup threshold value, an overvoltage protection value, a stop threshold value and a current gradient determination value. The feedback device can eliminate the circulation between the energy feedback unit and the rectifier unit, has a larger feedback capacity than a low voltage feedback device, has a simplified structure when compared with a conventional medium voltage feedback device, and uses less general assembly dimensions and land occupation areas, thus reducing cost, and providing good versatility.

Description

technical field [0001] The invention relates to a regenerative braking energy feedback technology of an urban rail traction power supply system, in particular to a co-rectifier transformer medium-voltage regenerative braking energy feedback device and a control method thereof. Background technique [0002] At present, in the urban rail traction power supply system, there are mainly three solutions for dealing with the regenerative energy generated during train braking. One is the solution of low-voltage feedback + resistance consumption, which mainly consists of low-voltage transformers, converters, choppers, Composed of braking resistors, etc., the braking energy is fed back to the low-voltage power distribution AC400V grid, and 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 It is consumed by braking resistors, and the reutilization rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02J3/38B60L7/10
CPCY02T10/72
Inventor 贺文张铁军陈广赞陈雪张玉平尹维恒易韵岚卡格德尔·鲁卡张小珍陈文姣周立明
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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