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Medium-voltage flexible direct current tractive power supply system and controlling method thereof

A traction power supply system, flexible direct current technology, applied in collectors, electric vehicles, wind power generation, etc., to achieve safe and stable operation, promote green and sustainable development, and simple catenary structure

Active Publication Date: 2018-04-24
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in view of the many problems exposed by the existing AC traction power supply system

Method used

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  • Medium-voltage flexible direct current tractive power supply system and controlling method thereof
  • Medium-voltage flexible direct current tractive power supply system and controlling method thereof
  • Medium-voltage flexible direct current tractive power supply system and controlling method thereof

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 , a medium-voltage flexible DC traction power supply system, which consists of multiple traction substations interconnected through the traction network to form a through-type DC power supply network that provides electric energy to locomotives; wherein, each traction substation includes: three-phase step-down Transformer, three-phase reactor, voltage source converter, DC bus. Among them, the positive pole and the negative pole of the output terminal of the voltage source converter are respectively connected with the positive pole and the negative pole of the DC bus of the traction substation, and the positive pole and the negative pole of the DC bus are respectively connected with the catenary and the steel rail through the feeder line and the return line.

[0024] In the above-mentioned medium-voltage flexible DC traction power supply system,...

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Abstract

The invention discloses a medium-voltage flexible direct current tractive power supply system and a controlling method thereof. The tractive power supply system comprises more than one traction powersubstation. The traction power substation comprises a three-phase step-down transformer, a three-phase electric reactor, a voltage source current converter and a first direct current bus which are connected successively. The input end of the three-phase step-down transformer is connected to a three-phase power grid. The positive pole and the negative pole of the output end of the voltage source current converter are connected to the positive pole and the negative pole of the first direct current bus. The positive pole and the negative pole of the first direct current bus are connected to a contact system and a steel rail. The beneficial effects of the medium-voltage flexible direct current tractive power supply system are that the electric energy quality of the system can be greatly improved, the electric phase splitting link is completely eliminated, and the through power supply of the whole traction network is realized. In addition, the system is capable of increasing the power supply distance of the single traction substation, and realizing the renewable energy sources along the railway and the effective utilization of the locomotive regenerative braking energy.

Description

technical field [0001] The invention relates to the technical field of traction power supply systems for electrified railways, in particular to a medium-voltage flexible DC traction power supply system and a control method thereof. Background technique [0002] The traction power supply system is the power source of the electrified railway, the quality of its power supply will have an important impact on the safe, reliable and economical operation of the railway. At present, the main power supply mode of electrified railways in most countries is that the traction substation takes power from the three-phase grid through a three-phase-two-phase transformer and transforms it into two phases to supply power to the traction grid on both sides. However, with the development of high-speed and heavy-duty railways, this power supply mode is facing severe challenges. Mainly reflected in: 1) the existing traction power supply system has problems such as negative sequence, harmonics an...

Claims

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Application Information

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IPC IPC(8): B60M3/00H02J7/35F03D9/11
CPCH02J7/35F03D9/11B60M3/00Y02E10/72Y02E70/30
Inventor 胡海涛杨孝伟葛银波何正友
Owner SOUTHWEST JIAOTONG UNIV
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