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Multi-flow traction transmission system and method based on modular multilevel converter

A modular multi-level, traction transmission technology, applied in the field of rail transit traction drive conversion, can solve problems such as difficulty in adapting to the development needs of rail transit

Active Publication Date: 2020-02-14
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-flow traction transmission system and method based on modular multilevel converter

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Embodiment Construction

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

[0039] Such as figure 1 As shown, a multi-current traction transmission 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, intermediate frequency transformer 8, rectifier unit 9 and traction inverter 10;

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

[0041] The output port...

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Abstract

The invention discloses a multi-flow traction transmission system and method based on a modular multilevel converter, which utilizes a power electronic traction transformer to carry out traction electric energy transmission. Under an AC traction power supply system, the modularized multilevel converter is connected with a traction power supply contact network for voltage reduction and frequency rise, then a middle high-frequency transformer is isolated, an output winding is connected with a rectifier, the rectifier is connected with a traction inverter, and the inverter outputs a three-phase alternating current to drive a motor to operate; and under a direct current traction power supply system, the output winding of the middle high-frequency transformer is used as a DC filter reactor, andthe motor is driven to operate through a direct-current voltage-stabilizing capacitor, the rectifier and the traction inverter in sequence. Through equipment multiplexing and replacement of a power frequency traction transformer, the system volume, weight and cost can be effectively reduced, and the overall performance is improved.

Description

technical field [0001] The invention belongs to the technical field of rail transit traction drive conversion technology, and in particular relates to a multi-stream traction drive system and method based on a modular multilevel converter. Background technique [0002] The traction drive system obtains electric energy from the traction power supply network and drives the locomotive, which is the core equipment of the electric locomotive. In the development process of rail transit electrification, due to factors such as technological history and physical space, there are various power supply systems in the traction power supply network. At present, traction power supply systems widely used in the world include 25kV, 15kV power frequency AC and 3kV, 1.5kV DC. The multi-current system 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 electric locomotives. The power electronic tracti...

Claims

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Application Information

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Patent Type & Authority Applications(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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