Electrization railway AC feed system

A technology for electrified railways and AC feeding, applied to power lines, vehicle components, transportation and packaging, etc., can solve problems such as inability to connect single-phase AC, difficulty in public interest of trains, difficulty in realization, etc., to achieve simplified tram control, Improve ride comfort and reduce load

Active Publication Date: 2006-06-28
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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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0111] 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.

[0112] The Scott connection transformer TR transforms the three-phase AC power so...

no. 2 Embodiment approach

[0162] Fig. 10 is a block diagram showing an AC power feeding system for an electrified railway according to a second embodiment of the present invention.

[0163]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.

[0164] 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°.

[0165] The M block output is connected to the single-phase AC feeder Fa, an...

no. 3 Embodiment approach

[0198] 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.

[0199] 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.

[0200] 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 AC feeding system of the present invention seeks to have no switching area and simplifies the control of electric cars. One of the multiple substations has: the first three-phase power supply with the first frequency; the three-phase AC of the first three-phase power supply is converted into two-phase AC, a transformer in which only one of the two-phase output terminals is connected to the above-mentioned single-phase AC feeder; a first power converter with AC output terminals connected to the M seat of the two-phase output terminals of the transformer; The second power converter with AC output terminals connected to the T block of the two-phase output terminals of the transformer; the DC smoothing capacitor connected to the common DC terminals of the first and second power converters; the control from the first and a compensation current control unit for the compensation current generated by the second power converter; a second three-phase power supply having a second frequency; converting the three-phase alternating current of the second three-phase power supply into direct current, and supplying direct current power to the direct current smoothing capacitor diode rectifier.

Description

technical field [0001] The invention relates to an AC feed system for an electrified railway. Background technique [0002] 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. [0003] 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 and T block in different directions. The voltages of the M block and the T block are respective single-phase voltages among the 2-phase voltages output from the above-mentioned Scott connection transformer, and have a phase difference of 90°....

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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