No commutation zone and in-phase traction power supply system for electrified railway

A technology for electrified railways and traction networks, which is applied to power lines, transportation and packaging, and vehicle components, and can solve problems affecting transportation capacity, high electricity charges for electrified railways, and blocked train power supply, so as to improve safety, transportation efficiency, and convenience The effect of train operation and accelerated construction progress

Inactive Publication Date: 2017-04-19
SHANGHAI WIND NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Therefore, excessive phase separation is still a technical bottleneck for traction power supply of electrified railways
[0006] 2. High-speed and heavy-duty transportation require large-capacity power supply. In order to meet the national standard power system restrictions on electrified railway power quality with negative sequence as the most prominent indicator, the reactive power compensation technology used in the original out-of-phase power supply method has been unable to adapt
If the adjustable symmetrical compensation is adopted in the traction substation, it will be difficult to achieve the ideal state both technically and economically
[0007] 3. The high-speed railway to be built in my country may be a mixed operation mode of high and medium speeds. If there is a mixed use of

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  • No commutation zone and in-phase traction power supply system for electrified railway
  • No commutation zone and in-phase traction power supply system for electrified railway
  • No commutation zone and in-phase traction power supply system for electrified railway

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Embodiment Construction

[0025] To change the balanced three-phase power into a single-phase power supply, the simplest traditional method is to fully rectify the balanced three-phase power into direct current, and then pass through a DC / AC inverter to convert the direct current into single-phase alternating current in full. This structure is called a basic 3-phase to 1-phase converter circuit.

[0026] figure 1 It is a traditional basic 3-phase to 1-phase electronic converter circuit.

[0027] DC / AC inverters are divided into voltage source inverters and current source inverters. The former has higher efficiency and better voltage stability, while the latter has good current limiting characteristics and high safety.

[0028] figure 1 a) is a DC / AC voltage source inverter, and there is a parallel capacitor C in the DC circuit. figure 1 b) is a DC / AC current source inverter, and an inductor L is connected in series in the DC circuit.

[0029] The rectifier and inverter are bidirectional, which can ...

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PUM

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Abstract

The invention discloses a device for converting balanced three-phase electric power into single-phase electric power, which comprises a plurality of electrified railway traction power supply devices which are composed of an electronic device and/or a motor transformer. The devices have the advantages of high efficiency, energy saving, low cost, easiness in manufacturing and so on, the capacity of power processed by the electronic device accounts for about 46% to 67%, the balanced three-phase electric power can be converted into the single-phase electric power, and better three-phase balance and high power factor can be obtained by negative sequence compensation and reactive power compensation, therefore, the commutation zone in the electrified railway can be canceled, so as to save the investment in railway construction, stabilize the train power supply, and improve the safety of train operation.

Description

[0001] field of invention [0002] The invention belongs to the electric energy transmission technology in the field of electric technology, and in particular relates to three-phase balanced traction power supply of electrified railways. Background technique [0003] Electrified railway is an important means of railway traction energy supply. Electrified railways are mainly powered by the AC power grid, but the current power grid is a three-phase system, which requires the three-phase currents to be equal, otherwise negative-sequence currents and reverse-sequence magnetic fields will be generated, which will affect the normal operation of generators and motors in the power grid. However, it is difficult for the traction network and pantograph to introduce three-phase power into the train, and only a single-phase traction network can be used to transmit electric energy to the train. Moreover, the power consumption of the train is huge, and it is easy to generate unbalanced thre...

Claims

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Application Information

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IPC IPC(8): B60M3/00
CPCB60M3/00
Inventor 於岳亮於菲瑞秋
Owner SHANGHAI WIND NEW ENERGY TECH
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