Electric railway alternating current feeding system

An electrified railway, AC feeding technology, applied in power lines, vehicle parts, transportation and packaging, etc., can solve the problems of inability to connect single-phase AC, difficulties in train public interests, time constraints, etc., to simplify tram control, The effect of improving riding mood and simplifying control

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 feed system of the present invention. In the figure, SUP1 represents a three-phase AC power supply, TR represents a Scott-connected transformer, Fa represents a single-phase AC feeder, Load represents a trolley load, TRm, TRt represent a single-phase transformer, CNV1, CNV2 represent a voltage-type self-excited power conversion Cd represents a DC smoothing capacitor, and CONT1 represents a control unit that balances the aforementioned two-phase unbalanced compensation currents (compensation current detection values) IMc, ITc output through the power converters CNV1, CNV2 and single-phase transformers TRm, TRt. The compensation currents IMc and ITc, like the Hall CT not shown, are provided by arranging current detectors in, for example, figure 2 The position of the arrow can be detected.

[0113] The Scott wiring transformer TR transforms the three-phase AC power sources Vu, Vv, a...

no. 2 Embodiment approach

[0163] Picture 10 It is a block diagram showing an electric railway AC power feed system according to the second embodiment of the present invention.

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

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

[0166] The output of Block M is connected to the single-phase AC feeder Fa, Block T...

no. 3 Embodiment approach

[0199] Picture 12 It is a block diagram showing the third embodiment of the control unit of the compensation currents IMc and ITc output from the first and second self-excited power converters CNV1 and CNV2 of 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 and subtractor, Gi1(S), Gi2(S) Represents 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 a frequency twice the frequency f1 of the AC feeder line. The detected value of the load power PL is time-averaged, and the average value PL(av) of the load power is obtained. Next, through the proportional element Kff, a forward-compensated effective current peak value command Ismff proportional to the above-mentioned ...

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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 or 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 for an invention patent application with an application number of 200510138136.X, an application date of December 22, 2005, and an invention title of "Electrified Railway AC Feeder System". Technical field [0002] The invention relates to an alternating current feed system for electrified railways. Background technique [0003] Currently, as documents related to such an electrified railway AC power feeding system, techniques described in Japanese Patent Laid-Open No. 2001-47894 (Patent Document 1) and Japanese Patent Laid-Open No. 2001-71820 (Patent Document 2) are known. [0004] In the previous AC power feed system for electrified railways, a Scott-connected transformer was used to convert three-phase AC power to two-phase, and it was used as the power source for two single-phase AC feeders. Each AC feeder passed through the pantograph. The rack supplies power to the load of the tram. The two single-phase AC feeders are bounde...

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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