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A rail transit hybrid power supply system and unbalance degree control method

A power supply system, rail transit technology, applied in the direction of power lines, electrical components, single-network parallel feeding arrangement, etc., can solve the problems of unbalance control, reactive power compensation and harmonic current compensation, etc., to achieve pure current and eliminate Effects of stray current, ease of implementation

Active Publication Date: 2021-04-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rail transit hybrid power supply system, which can effectively solve the problem of simultaneously providing power to locomotive loads and power lighting equipment, and has the functions of unbalance degree control, reactive power compensation and harmonic current compensation, and solves the following problems: Technical Problems of Power Quality Based on Negative Sequence

Method used

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  • A rail transit hybrid power supply system and unbalance degree control method
  • A rail transit hybrid power supply system and unbalance degree control method
  • A rail transit hybrid power supply system and unbalance degree control method

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Embodiment 1

[0037] Such as figure 1 , figure 2 As shown, this embodiment provides a rail transit hybrid power supply system, including an in-phase traction power supply system 1, a power lighting power supply system 2 and a measurement and control device 3, and the high-voltage side of the in-phase traction power supply system 1 and the power lighting power supply system 2 are connected to the three-phase bus 4, and the measurement and control device 3 is used to detect the three-phase voltage unbalance of the three-phase bus 4 and the three-phase current unbalance of the dynamic lighting feeder 16 at the entrance of the power lighting power supply system 2 , and control the in-phase converter 14 in the in-phase traction power supply system 1 to perform negative sequence compensation according to the detection result, so as to realize unbalance control.

[0038]In this embodiment, the three-phase busbar 4 is connected to the three-phase grid through the three-phase incoming line 5, the ...

Embodiment 2

[0048] Such as Figure 5 As shown, this embodiment provides an unbalance control method based on the rail transit hybrid power supply system provided in Embodiment 1, and the method is applied to the measurement and control device 3, including:

[0049] S1: through single-phase voltage transformer 3a 2 Detect the voltage of the traction bus 10 ; via single-phase current transformer 3a 1 Detect the current of feeder 11 ;Through the three-phase voltage transformer 3a 4 Detect the three-phase voltage of the three-phase bus 4 , with , through the three-phase current transformer 3a 3 Detect the three-phase current of the moving photo feeder 16 , with ;

[0050] S2: according to the detected three-phase voltage , with Calculate the three-phase voltage unbalance degree of the three-phase bus 4 , according to the detected three-phase current , with Calculate the three-phase current unbalance degree of the moving photo feeder 16 and the current value ...

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Abstract

The invention discloses a rail transit hybrid power supply system and an unbalance degree control method, and relates to the technical field of electrified railway power supply. Including the same-phase traction power supply system, power lighting power supply system and measurement and control device, the high-voltage sides of the same-phase traction power supply system and power lighting power supply system are connected to the three-phase bus, and the measurement and control device is used to detect the three-phase voltage unbalance and power of the three-phase bus. The unbalance degree of the three-phase current of the dynamic lighting feeder at the entrance of the lighting power supply system, and control the same-phase traction power supply system to perform negative sequence compensation according to the detection results. The present invention has the function of supplying power to locomotive loads and power lighting equipment at the same time, and has the functions of unbalance degree control, reactive power compensation and harmonic current compensation, solves the problem of power quality mainly based on negative sequence, and is suitable for various occasions Rail transit power supply.

Description

technical field [0001] The invention relates to the technical field of rail transit power supply, in particular to the field of single-phase AC power supply systems for AC subways, urban railways and mountain rail transits. Background technique [0002] The power supply system of the current traction power supply system of rail transit is divided into DC system and AC system. The DC system is mainly used in urban rail transit represented by subways and light rails. It has the advantages of non-separated phase power supply and smooth train operation. However, since a large part of the regenerative energy is difficult to use directly or economically, it is necessary to add expensive inverters or storage devices. At the same time, there are hidden dangers that the inverter device refuses to operate and the regenerative braking of the train fails to turn to the air brake to threaten the safety of the train. In addition, the stray currents that exist will generate electricity to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01H02J3/38H02J3/26H02J3/46H02J3/06B60M3/00
CPCH02J3/18H02J3/01H02J3/38H02J3/46H02J3/06H02J3/26B60M3/00H02J2203/10H02J2300/40Y02E40/40Y02E40/30
Inventor 李群湛王辉郭锴吴波解绍锋李子晗黄小红
Owner SOUTHWEST JIAOTONG UNIV
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