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Energy-saving high-voltage DC traction power supply converter device and control method without AC inductance

A high-voltage direct current, traction power supply technology, applied in the conversion of AC power input to DC power output, irreversible AC power input into DC power output, output power conversion device, etc., can solve the problem of resistance consumption and catenary network voltage drop Large, energy can only flow in one direction, etc., to achieve the effect of increasing the DC output voltage, reducing the catenary loss, and keeping the total output voltage constant

Inactive Publication Date: 2011-12-28
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This power supply method has been used for decades. Its biggest advantage is that the structure of the device is simple and the technology is relatively mature, but there are also some problems: 1. Due to the use of diode rectifiers, the energy can only flow in one direction, so the vehicle braking produces The energy cannot be fed back to the power grid, and is usually consumed by resistors, which will greatly waste energy
2. The DC output voltage is uncontrollable and has a large fluctuation range, which is not conducive to the safe, reliable and economical operation of the vehicle
3. The catenary network has a large voltage drop, and the distance between power supply stations is short, usually no more than 3 to 4 kilometers, resulting in a large number of required power supply stations and a large construction investment

Method used

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  • Energy-saving high-voltage DC traction power supply converter device and control method without AC inductance
  • Energy-saving high-voltage DC traction power supply converter device and control method without AC inductance
  • Energy-saving high-voltage DC traction power supply converter device and control method without AC inductance

Examples

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Embodiment

[0030] Example: such as image 3 , Figure 4 As shown, the multi-winding transformer 1 adopts epoxy resin casting dry-type transformer, which has one primary winding and three secondary windings. The connection mode of the multi-winding transformer 1 adopts Yd1, d1, and the transformation ratio of d1 is 35kv / 1.8kv / 1.8kv / 1.8kv, the capacity is 9MVA, and the equivalent short-circuit impedance of the secondary winding is 20%. Corresponding to the number of multi-winding transformers, there are three PWM rectifier units 4, the AC side of each PWM rectifier unit 4 is respectively connected to a secondary winding of the multi-winding transformer 1, and the DC side is connected in series in sequence. The DC output rated voltage of each PWM rectifier unit 4 is 3kV, and the capacity is 3MW.

[0031] In order to reduce the withstand voltage of the power devices in each PWM rectifier unit 4 and increase the system capacity at the same time, the main circuit of each PWM rectifier unit ...

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Abstract

The invention relates to an AC inductance-free energy-saving high-voltage DC traction power supply conversion device and a control method, which includes a multi-winding transformer and several conversion units. The multi-winding transformer consists of a primary winding and multiple secondary windings. Composed of windings, the number of circuits of the conversion unit is set corresponding to the number of secondary windings of the multi-winding transformer; the primary winding of the multi-winding transformer is connected to the AC power grid, and each secondary of the multi-winding transformer The side winding is connected to the input end of one converter unit, and the output terminals of each converter unit are serially connected in series to realize high-voltage direct current output. The invention saves electric energy, can ensure the stability of the DC power supply voltage, prolongs the power supply distance, and reduces the catenary loss. The invention can be widely used in urban rail transit traction power supply systems.

Description

technical field [0001] The invention relates to a high-voltage direct current traction power supply conversion device and a control method, in particular to an AC inductance-free energy-saving high-voltage direct current traction power supply conversion device and a control method for supplying power to urban rail transit vehicles. Background technique [0002] At present, the traction power supply conversion device of urban rail transit in my country still uses diode rectifiers, and the power supply voltage is 750V or 1500V. This power supply method has been used for decades. Its biggest advantage is that the structure of the device is simple and the technology is relatively mature, but there are also some problems: 1. Due to the use of diode rectifiers, the energy can only flow in one direction, so the vehicle braking produces The energy cannot be fed back to the power grid, and is usually consumed by resistors, which will greatly waste energy. 2. The DC output voltage is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/04H02M7/219
Inventor 张钢柴建云牟富强
Owner TSINGHUA UNIV
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