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Intelligent three-phase traction power supply system and power flow control method thereof

A technology of traction power supply system and power flow regulation, applied in the direction of AC network with the same frequency from different sources, power lines, AC network load balancing, etc., can solve the problem of train speed and traction loss, vehicle network electrical transient, no three-phase Issues such as power supply crossing current suppression research, to achieve the effect of eliminating negative impacts, advanced technology, and improving direct utilization

Active Publication Date: 2022-04-12
SOUTHWEST JIAOTONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious shortcomings in the single-phase power frequency AC system: power quality problems mainly caused by negative sequence, train speed and traction loss caused by electric phase separation, and electrical transient problems between trains and networks caused by train passing electric phase separation
[0005] People have proposed some methods to suppress crossing currents, such as Chinese Patent 1 "A Bilateral Power Supply System for Electrified Railways" (Authorization No.: CN103552488B), Chinese Patent 2 "A Bilateral Power Supply Method for Electrified Railways" (Authorization No.: CN110126682B), etc. However, these methods are all for single-phase traction power supply systems, and there is no research on three-phase power supply ride-through flow suppression

Method used

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Embodiment 1

[0036] Such as figure 1 As shown, this embodiment provides an intelligent three-phase traction power supply system, including a main transformer MT. The intelligent three-phase traction power supply system is provided with a power flow control device PCD and a controller CC. The primary side of the main transformer MT is connected to the three-phase grid Connection, the secondary side is connected with the three-phase busbar MB, the three-phase busbar MB is connected with the three-phase double-sided cable TC with double-sided power supply through the three-phase feeder Fa, the feeder Fb and the feeder Fc, and the three-phase double-sided cable TC is connected through one or more three-phase The traction transformer is connected to the traction network TN, and the traction network TN provides electric energy to the train through the three-phase contact flow; the controller CC controls the power flow according to the power information of the three-phase bus MB and the three-phas...

Embodiment 2

[0048] Such as image 3 As shown, this embodiment provides a control method based on an intelligent three-phase traction power supply system, the method comprising:

[0049] Step S100: Voltage transformer Ya, voltage transformer Yb, and voltage transformer Yc detect the voltage of the three-phase bus MB, and voltage transformer La, voltage transformer Lb, and voltage transformer Lc detect the three-phase feeder Fa, feeder Fb, and feeder Fc current;

[0050] Step S200: According to the detected voltage of the three-phase bus MB and the current of the three-phase feeder Fa, feeder Fb and feeder Fc, calculate and obtain the power provided by the three-phase bus MB to the traction network TN through the three-phase feeder Fa, feeder Fb and feeder Fc Active power flow; among them, the active power flow flowing from the three-phase bus MB to the traction network TN is positive, and the active power flow flowing from the traction network TN to the three-phase bus MB is negative;

...

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Abstract

The invention provides an intelligent three-phase traction power supply system and a power flow control method thereof, and relates to the technical field of electrified railway traction power supply. The intelligent three-phase traction power supply system is provided with a power flow regulation and control device and a controller, double-side power supply is carried out on a traction network, and the power flow regulation and control device is controlled to realize self-utilization of power generation power flow according to three-phase bus voltage and three-phase feeder current electric quantity information, so that the power generation power flow returned to a power grid is zero; under the condition that a three-phase power supply structure of a power grid to an electrified railway is not changed, the crossing tide is utilized, the negative influence of the crossing tide on the power grid and a user is eliminated, the advantages of three-phase power supply are brought into full play, and regenerative braking energy can be directly supplied to a traction substation power distribution system.

Description

technical field [0001] The invention relates to the technical field of AC electrified railway traction power supply, in particular to an intelligent three-phase traction power supply system and a power flow control method thereof. Background technique [0002] Rail transit power supply system is divided into DC system and AC system. The direct current system is generally used in urban rail transit mainly composed of subways and light rails. The DC system has problems such as stray current pollution that is difficult to overcome and difficulties in regenerative braking energy recovery. Main line railway mainly adopts power frequency single-phase AC system. The single-phase power frequency AC system has obvious disadvantages: power quality problems mainly caused by negative sequence, train speed and traction loss caused by electric split phases, and electrical transient problems between trains and networks caused by trains passing through electric split phases. [0003] Thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/28B60M3/06
Inventor 李群湛黄小红李子晗郭锴解绍锋易东
Owner SOUTHWEST JIAOTONG UNIV
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