EP1126989A1 - Alimentation en courant electrique c.c. de traction - Google Patents

Alimentation en courant electrique c.c. de traction

Info

Publication number
EP1126989A1
EP1126989A1 EP99959305A EP99959305A EP1126989A1 EP 1126989 A1 EP1126989 A1 EP 1126989A1 EP 99959305 A EP99959305 A EP 99959305A EP 99959305 A EP99959305 A EP 99959305A EP 1126989 A1 EP1126989 A1 EP 1126989A1
Authority
EP
European Patent Office
Prior art keywords
supply
conductor
tracks
power
inductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP99959305A
Other languages
German (de)
English (en)
Inventor
Thorsten Schütte
Bo Kindell
Gunnar HAMMARSTRÖM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Balfour Beatty PLC
Original Assignee
Balfour Beatty PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Balfour Beatty PLC filed Critical Balfour Beatty PLC
Publication of EP1126989A1 publication Critical patent/EP1126989A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power

Definitions

  • the present invention relates to a direct current electricity supply system for traction.
  • the invention provides a direct current electricity supply system for two parallel vehicular tracks, comprising common means for supplying a first supply conductor for a first of said tracks with a positive voltage and also for supplying a second supply conductor for a second of said tracks with a negative voltage substantially equal in magnitude to said positive voltage, and at least one return conductor substantially at ground.
  • the common supply means comprises feeding stations at which voltage is supplied symmetrically to the first and second supply conductors .
  • the at least one return connector may comprise at least one rail of each vehicular track and optionally paralleling conductors may be connected to the return conductors to reduce their effective resistance.
  • the invention may incorporate the circuitry for DC-fed systems described in Swedish Patent Application No.
  • Energy storing means may comprise at least one inductor and/or at least one capacitor.
  • a capacitor and/or an inductor may be rapidly switched so as to be alternately connected firstly between the first supply conductor and a return conductor and then between the return conductor and the second supply conductor.
  • the DC sides of two inverters may be connected to the first and second supply conductors respectively, the AC sides of the inventors being connected to two windings of a common transformer. This doubles the transmission voltage and dramatically reduces the return current and the resulting electromagnetic and electrolytic/corrosive interference.
  • Such circuitry is referred to herein as a "DC autotransformer" .
  • the power to be redistributed by the DC autotransformer in the system of the present invention is only the difference between the power consumed on the two parallel tracks. This contrasts with the system described in SE 9803519.9 where the DC autotransformer must redistribute the entire power consumed between catenary and ground into the catenary/negative feeder loop.
  • Figure 1 is a schematic circuit diagram of a traction supply system according to one embodiment of the invention.
  • Figure 2 is a schematic circuit diagram of a traction supply system according to an alternative embodiment; and Figures 3 to 8 show alternative systems, all exemplified by Figure 2, in more detail.
  • Figure 1 schematically shows a DC traction power supply in which a first supply conductor P is supplied with a positive voltage and a second supply conductor N is supplied with a negative voltage substantially equal in magnitude to the positive voltage.
  • the positive supply conductor P supplies power to vehicles running along one track and the negative supply conductor N supplies power to vehicles running in the opposite direction along a parallel track.
  • Power is returned via a return conductor R which may be constituted by the rails along which the vehicles run and preferably paralleling conductors connected thereto.
  • Symmetrical feeding stations 5, 6 supply power to the two supply conductors.
  • FIG. 2 shows an alternative system comprising a DC autotransformer 7 serving to redistribute power differences between the two tracks.
  • the DC autotransformer comprises energy storing means 12 , switching means 13 for switching the energy storing means between a connections to the first and second supply conductors P, N and a control device 14 for controlling the switching means 13 to operate at a frequency preferably greater than 300 Hz.
  • FIG. 3 shows one implementation of the DC autotransformer 7.
  • An inductor 15 is connected to the return conductor R.
  • a switch 16 for example an insulated gate bipolar transistor (IGBT) with a diode connected in series, is arranged to connect the inductor 15 alternately to the first and second supply conductors P, N.
  • a capacitor 17 is connected between the first supply conductor P and the return conductor side of the inductor 15 and a capacitor 18 is connected between the second supply conductor N and the return conductor side of the inductor 15.
  • the inductor 15 is 5 mH
  • the capacitors 17, 18 are both 5 mF
  • the switching frequency is 300 Hz.
  • the inductor 15 Because the inductor 15 is rapidly switched between connections to either the first supply conductor P or the second supply conductor N, it receives energy from whichever of the two supply conductors is more lightly loaded, stores the energy and passes it to the more heavily loaded supply conductor. If the switching frequency is sufficiently high then any voltage drop in the supply conductors P, N caused by loading will be shared equally between the two supply conductors. Thus the distance between adjacent feeding stations can be increased if one or more DC autotransformers are present between the feeding stations.
  • Figure 4 shows an alternative DC autotransformer in which the switch 16 is arranged to connect the return conductor R alternately to an inductor 22 connected to the first supply conductor P and an inductor 23 connected to the second supply conductor N.
  • a capacitor 24 is connected across the switched ends of the inductors 22, 23.
  • the circuit of Figure 4 redistributes energy in a similar manner to that of Figure 3.
  • the capacitor 24 is either charged by whichever inductor 22, 23 is disconnected from the return conductor R, or discharged by the inductor which is connected to the return conductor R, depending on the relative loading of the first and second supply conductors P, N.
  • FIG. 5 shows a further alternative DC autotransformer in which the return conductor R is connected to the interconnection 29 of two series-connected coils 25, 26 of a transformer 27 having a core 28.
  • Switches 30, 31 are arranged to connect the transformer 27 across the supply conductors P, N in alternate directions (i.e. the switches are controlled so that either both are in the positions shown by the solid lines or both are in the positions shown by the dotted lines) .
  • Two current paths are established at any time, each comprising one of the switches 30, 31, its associated coil 25, 26 respectively and the return conductor R. Only half of the current flows through each switch and the switches can therefore be smaller and cheaper than those of the embodiments shown in Figures 3 and 4.
  • the use of an iron cored transformer, having an inductance of say 40 H decreases the voltage ripple on the supply conductors P, N.
  • Figure 6 shows yet another embodiment of DC autotransformer in which, depending on the state of switches 41, 42, a capacitor 34 is either connected between the positive conductor P and the return conductor R, or between the return conductor R and the negative conductor N.
  • the electronic switches 41, 42 are operated at a frequency preferably greater than 300 Hz by a control device 45 generating a suitable pulse train.
  • the switches 41, 42 may be formed from antiparallel connected thyristors (triacs) 46 as shown, or alternatively from insulated gate bipolar transistors. Switching transients are damped by smoothing capacitors 47,
  • FIG 8 shows still another embodiment of DC autotransformer comprising two inverters 58, 59, the DC sides of which are connected to the first and second supply conductors P, N respectively.
  • the AC sides of the inverters are connected to respective windings 60, 62 of a transformer 61 having a core 63.
  • electrical energy can be transmitted from one of the supply conductors P, N to the other of them. Since some power redistribution is carried out by the vehicles themselves, DC autotransformers in the systems of
  • Figures 2 to 8 can have an increased spacing and/or a decreased power rating compared with the system described in SE 9803519.9.
  • the present invention is particularly suitable for heavily loaded railways with few branching points .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

Circuit d'alimentation en courant électrique c. c. de traction comprenant un premier conducteur d'alimentation (P), pour l'alimentation en courant électrique de véhicules sur une première voie, un second conducteur d'alimentation (N), pour l'alimentation en courant électrique de véhicules sur une seconde voie, parallèle à la première, et un conducteur de retour (R). Le premier et le second conducteurs d'alimentation (P, N) sont alimentés en tensions égales et opposées, par des postes d'alimentation communs (5, 6). Un « autotransformateur c.c. » optionnel (7) comprend des moyense stockage d'énergie (12) commutables rapidement de l'un des conducteurs d'alimentation (P, N) à l'autre, en vue de redistribuer le courant.
EP99959305A 1998-11-04 1999-11-04 Alimentation en courant electrique c.c. de traction Pending EP1126989A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9824215 1998-11-04
GB9824215A GB2343432B (en) 1998-11-04 1998-11-04 DC traction power supply
PCT/EP1999/009015 WO2000026054A1 (fr) 1998-11-04 1999-11-04 Alimentation en courant electrique c.c. de traction

Publications (1)

Publication Number Publication Date
EP1126989A1 true EP1126989A1 (fr) 2001-08-29

Family

ID=10841858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99959305A Pending EP1126989A1 (fr) 1998-11-04 1999-11-04 Alimentation en courant electrique c.c. de traction

Country Status (4)

Country Link
EP (1) EP1126989A1 (fr)
AU (1) AU1652900A (fr)
GB (1) GB2343432B (fr)
WO (1) WO2000026054A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102874132A (zh) * 2012-10-22 2013-01-16 中铁二院工程集团有限责任公司 带有电容性电气设备的复线电气化铁道分区所主接线
CN104009657A (zh) * 2014-04-29 2014-08-27 株洲变流技术国家工程研究中心有限公司 一种直流牵引供电装置
CN104986057B (zh) * 2015-07-22 2017-06-09 北京交通大学 轨道交通负电压回流直流供电系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61191441A (ja) * 1985-02-20 1986-08-26 Hitachi Ltd 電気鉄道用変電所のき電装置
DE4126816C2 (de) * 1991-08-09 1996-05-15 Elpro Ag Schaltungsanordnung für ein Gleichrichter-Unterwerk
JPH0564323A (ja) * 1991-09-03 1993-03-12 Hitachi Ltd 直流変電所
JPH07246866A (ja) * 1994-03-08 1995-09-26 Toshiba Corp き電装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0026054A1 *

Also Published As

Publication number Publication date
GB2343432A (en) 2000-05-10
GB2343432B (en) 2003-06-04
AU1652900A (en) 2000-05-22
WO2000026054A1 (fr) 2000-05-11
GB9824215D0 (en) 1998-12-30

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Inventor name: SCHUETTE, THORSTEN