Low-frequency traction power supply system

A traction power supply system and traction substation technology, applied in the field of transportation, can solve the problems of transformer volume increase, uneconomical, etc., and achieve the effects of fast action speed, convenient operation, and reduced voltage loss

CN103241138AActive Publication Date: 2013-08-14SOUTHWEST JIAOTONG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-08-14

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Abstract

The invention discloses a low-frequency traction power supply system which is composed of traction substations and traction networks. Each traction substation comprises a traction transformer and a transducer, a primary-side three phase of each traction transformer is connected with a public utility grid, a secondary-side three phase of each traction transformer is connected with the corresponding transducer, traction sides output by the transducers is single-phase, and the traction networks are powered through single-phase traction buss. The power supply frequency f of the traction networks meets the following formula: fault removal time limit TS (ms) of the traction network=relay protection action time TR (ms)+half cycle lambda (ms), namely, f=500 / (TS-TR), TS)TR and within 5Hz-16Hz, the traction networks of the traction substations can be connected to implement communicated power supply, and during interruption maintenance or traction-side fault of the traction substation, the transducers are switched off and related breakers are switched on. The low-frequency traction power supply system is widely suitable for power supply of metros with one line at one place, light-rail vehicles, tramcars and trolleybuses with two electric traction lines, and convenient to implement.
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Description

technical field

[0001] The invention relates to the field of transportation, in particular to a low-frequency traction power supply technology. Background technique

[0002] Taking advantage of the single-phase traction power supply system's advantages of simple structure, low construction cost, and convenient operation and maintenance, the main line electrified railway generally adopts a relatively high voltage (27.5kV) single-phase power frequency AC system, while urban subways, light rails and railways Public transportation such as rails and trolleybuses generally adopt a lower voltage direct current system.

[0003] The electrified railway adopting the single-phase power frequency alternating current system directly draws power from the public grid, only uses low-cost and reliable transformers, does not use high-cost converters, and has the remarkable characteristics of large traction power and large transportation volume. However, there will also be negative sequence-ba...

Examples

Embodiment

[0026] figure 1 It is a schematic structural diagram of a low-frequency traction power supply system according to an embodiment of the present invention. The adopted technical scheme includes the traction substation SS and the traction network OCS; the traction substation SS obtains power from the public grid PS, connects to the primary side of the traction transformer TT through the three-phase AC switch MK, and then passes through the secondary side of the traction transformer TT The low-voltage three-phase AC switch LK is connected to the inverter UF. The traction side output by the inverter UF is a low-frequency single-phase and supplies power to the traction network OCS and the vehicle L through the single-phase traction bus BB. The single-phase traction bus BB is divided into two feeders on the left and right. Also set up feeder circuit breakers KL and KR to realize OCS segmentation of the traction network for maintenance and isolation of faults.

[0027] The working pr...