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Multi-current traction drive system and method based on modular multi-level converter

A modular multi-level, traction transmission technology, applied in the direction of battery/battery traction, control drive, electric vehicles, etc., can solve problems such as difficulty in adapting to the development needs of rail transit, and achieve volume and weight reduction, cost savings, and reduction of The effect of the number of devices

Active Publication Date: 2021-06-18
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the integration of multi-system functions is realized with one system through equipment reuse, which greatly reduces space, weight and cost, some inherent shortcomings of power frequency traction transformers make it difficult to adapt to the development needs of future rail transit

Method used

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  • Multi-current traction drive system and method based on modular multi-level converter

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Embodiment Construction

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] like figure 1 As shown in the figure, a multi-current traction drive system based on a modular multi-level converter includes a traction power supply catenary 1, a pantograph 2, an AC input reactor 3, a DC filter reactor 4, a wheel-rail 5, AC motor 6, modular multilevel converter 7, medium / high frequency transformer 8, rectifier unit 9 and traction inverter 10;

[0040] The traction power supply catenary 1 is connected to the pantograph 2, one end of the pantograph 2 and the AC input reactor 3 is connected through the first switch unit 13, and the other end of the AC input reactor 3 is connected to the modular multi-electrical The input upper port of the flat current converter is connected, and the input lower port of the modular multilevel converter is connected with the wheel rail 5 through the third switch unit 15;

[0041] The output port of ...

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Abstract

The invention discloses a multi-current traction drive system and method based on a modularized multi-level converter, which utilizes a power electronic traction transformer to transmit traction electric energy. Under the AC traction power supply system, the modular multilevel converter is connected to the traction power supply catenary for step-down and frequency up, and then isolated through the medium and high frequency transformer, the output winding is connected to the rectifier, and the rectifier is connected to the traction inverter , the inverter outputs three-phase AC to drive the motor to run; in the DC traction power supply system, the output winding of the medium and high frequency transformer is used as a DC filter reactor, which drives the motor to run through the DC stabilizing capacitor, rectifier and traction inverter in turn. By reusing equipment and replacing power frequency traction transformers, the volume, weight and cost of the system can be effectively reduced, and the overall performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of rail transit traction drive conversion, in particular to a multi-stream traction drive system and method based on a modular multi-level converter. Background technique [0002] The traction drive system obtains electric energy from the traction power supply network and drives the locomotive to run, which is the core equipment of the electric locomotive. During the development of rail transit electrification, due to factors such as technical history and physical space, there are various power supply systems in the traction power supply network. At present, the traction power supply system widely used in the world includes 25kV, 15kV power frequency AC and 3kV, 1.5kV DC. The multi-stream traction drive system can adapt to the flexible switching of the above two or more power supply systems, and realize the cross-line operation of the electric locomotive. The power electronic traction transformer has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/00B60L50/53B61C3/00
CPCB60L15/007B60L2210/20B61C3/00B60L50/53Y02T10/70Y02T10/72
Inventor 许加柱项锦文刘裕兴
Owner HUNAN UNIV
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