Electric railway alternating current feeding system

An electrified railway, AC feeding technology, applied in power lines, vehicle components, transportation and packaging, etc., can solve the problems of inability to pull through single-phase AC, difficulties in the public interest of trains, and difficult to achieve, to simplify the control of trams, The effect of improving riding mood and reducing load

Active Publication Date: 2009-07-22
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this would necessitate the removal of existing equipment (M / G units or Scott connection transformers, etc.) and all replacement with new equipment
In addition, even if only one substation is replaced to generate single-phase AC, and the two-phase voltage of M block / T block is output from the adjacent substation, the single-phase AC cannot be pulled through, and new equipment must be replaced in multiple substations at the same time
It is generally difficult to stop the operation of trains in the public interest, and it is very difficult to implement due to time constraints even if equipment replacement is performed at night

Method used

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  • Electric railway alternating current feeding system
  • Electric railway alternating current feeding system
  • Electric railway alternating current feeding system

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0112] figure 2 It is a block diagram showing the first embodiment of the electric railway AC power feeding system of the present invention. In the figure, SUP1 represents a three-phase AC power supply, TR represents a Scott connection transformer, Fa represents a single-phase AC feeder, Load represents a tram load, TRm and TRt represent a single-phase transformer, and CNV1 and CNV2 represent voltage-type self-excited power conversion Cd represents a DC smoothing capacitor, and CONT1 represents a control unit that balances the above-mentioned two-phase unbalanced compensation currents (compensation current detection values) IMc, ITc outputted through power converters CNV1, CNV2 and single-phase transformers TRm, TRt. Compensation currents IMc and ITc are obtained by disposing current detectors in, for example, Hall CTs not shown in the figure. figure 2 The arrow position of can be detected.

[0113] The Scott connection transformer TR transforms the three-phase AC power so...

no. 2 Embodiment approach

[0163] Figure 10 It is a block diagram showing an AC power feeding system for an electrified railway according to a second embodiment of the present invention.

[0164]In the figure, SUP1 represents a three-phase AC power supply, TR represents a Scott connection transformer, Fa represents a single-phase AC feeder, Load represents a tram load, TRm and TRt represent a single-phase transformer, and CNV1 and CNV2 represent voltage-type self-excited power conversion Cd represents a DC smoothing capacitor, Lf and Cf represent reactors and capacitors constituting an LC filter, and CONT1 represents a control unit for compensating currents IMc and ITc output from the above-mentioned power converters CNV1 and CNV2.

[0165] The Scott connection transformer TR transforms the three-phase AC power sources Vu, Vv, Vw into two-phase AC voltages VM, VT, and the two-phase voltages VM and VT have a phase difference of 90°.

[0166] The M block output is connected to the single-phase AC feeder...

no. 3 Embodiment approach

[0199] Figure 12 It is a block diagram showing a third embodiment of a control unit for compensation currents IMc, ITc outputted from the first and second self-excited power converters CNV1, CNV2 in the AC feed system of the present invention.

[0200] In the figure, Kff represents a proportional element, C1~C3 represent a comparator, Gv(S) represents a voltage control compensation circuit, M1, M2 represent a multiplier, AD1~AD5 represent an adder / subtractor, Gi1(S), Gi2(S) Indicates the current control compensation circuit, PWM1 and PWM2 are pulse width modulation control circuits.

[0201] The power PL of the single-phase load Load fluctuates at twice the frequency f1 of the AC feeder line. The detected value of the load power PL is time-averaged to obtain the average value PL(av) of the load power. Then, through the proportional element Kff, the effective current peak value command Ismff of the forward compensation proportional to the above-mentioned load power average v...

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Abstract

The purpose of this invention is to simplify the train control by eliminating a switching section. In the alternating current feeding system, one sub-station of a plurality of sub-stations is provided with a first three-phase alternating current power source that has a first frequency; a transformer that is used for changing the three-phase alternating voltage from the first three-phase alternating current power source to a two-phase alternating voltage, and for connecting one of the one-phase output terminal of the two-phase output terminal to a single phase alternating current feeding electric wire; a first power converter that has an alternating current output terminal connected to M seat of the two-phase output terminal of the transformer; a second power converter that has an alternating current output terminal connected to T seat of the two-phase output terminal of the transformer; a direct current smoothing capacitor connected to a common direct current terminal of the first and second power converters; a compensation current control means for controlling a compensation current generated from the first and the second power converters; a second three-phase alternating current power source that has a second frequency; and a diode rectifier for converting the three-phase alternating current of the second three-phase alternating current power source to a direct current and feeding direct current power to the direct current smoothing capacitor.

Description

[0001] This application is a divisional application of the invention patent application with the application number 200510138136.X, the application date is December 22, 2005, and the invention name is "Electrified Railway AC Feed System". technical field [0002] The invention relates to an AC feed system for an electrified railway. Background technique [0003] Currently, as documents related to such electrified railway AC power feeding systems, techniques described in JP-A-2001-47894 (Patent Document 1) and JP-A-2001-71820 (Patent Document 2) are known. [0004] In the previous AC feed system for electrified railways, the three-phase AC power supply was converted into two phases by using the Scott connection transformer, and it was used as the power supply for two single-phase AC feed lines, and each AC feed line passed through the pantograph The rack supplies power to the tram load. The two single-phase AC feeders are bounded by the substation and divided into M block an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60M3/02
CPCY02E40/30
Inventor 结城和明伊藤健治田中茂
Owner KK TOSHIBA
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