AU2016101444A4 - DC traction power supply system, distributed DC power supply and a respective housing - Google Patents
DC traction power supply system, distributed DC power supply and a respective housing Download PDFInfo
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- AU2016101444A4 AU2016101444A4 AU2016101444A AU2016101444A AU2016101444A4 AU 2016101444 A4 AU2016101444 A4 AU 2016101444A4 AU 2016101444 A AU2016101444 A AU 2016101444A AU 2016101444 A AU2016101444 A AU 2016101444A AU 2016101444 A4 AU2016101444 A4 AU 2016101444A4
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- power supply
- traction
- distributed
- enclosure
- power
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- 238000004146 energy storage Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The DC traction power supply system, according to the invention, comprises a traction 5 substation and a DC traction power supply network, which is connected to the traction substation for providing electrical energy provided by the traction substation to traction vehicles connected to the DC traction power supply network. The DC traction power supply system comprises at least one distributed DC power supply connected to the DC traction power supply network for providing electrical energy to the DC traction power 10 supply network. The maximal electric power delivered continuously by the distributed DC power supply (20) to the DC traction power supply network (14) is at least two times, preferably at least three times and most preferably at least four times less than the maximal electric power delivered by the traction substation (12) continuously. Fig. 1 12<_ . ...- 32 14,16 14,18 Fig. 1 6 2,68 62,70,70'-. 20 62,64- 80 Fig. 2 62,68 62,70,70'1-- 62,64 84 Fig. 3
Description
DESCRIPTION DC traction power supply system, Distributed DC power supply and a respective
Housing
FIELD OF THE INVENTION
The present invention relates to a DC traction power supply system for providing traction power to electric powered traction vehicles such as trams, rapid transits, also known as metros, subways or underground, trains propelled by locomotives or self-propelled carriages, railcars or trolleybus etc. It further relates to a distributed DC power supply and to a housing for a distributed DC power supply.
BACKGROUND OF THE INVENTION
Tram operators experience growing problems in their electric DC traction power supply network due to drops in the network voltage between substations, which provide electric power to the DC traction power supply network. This problem has arisen due to an increased number, and subsequent density, of electric powered traction vehicles on existing DC traction power supply systems and due to new electric powered traction vehicles requiring more electric power than older electric powered traction vehicles that were available when the DC traction power supply system, comprising traction substations and the DC traction power supply network, was planned and built.
DESCRIPTION OF THE INVENTION
The objective of the invention is to provide a solution to the above mentioned problem. The problem is solved by a DC traction power supply system according to claim 1. The problem is further solved by a distributed DC power supply according to claim 13 as well as a housing for electric and/or electronic components according to claim 9.
Advantageous developments of the invention are specified in the dependent claims.
The DC traction power supply system, according to the invention, comprises a traction substation and a DC traction power supply network connected to the traction substation, the DC traction power supply system provides electrical energy, which is supplied by the traction substation, to traction vehicles connected to the DC traction power supply network, wherein the DC traction power supply system comprises at least one distributed DC power supply connected to the DC traction power supply network for providing electrical energy to the DC traction power supply network, and wherein the maximal electric power delivered continuously by the distributed DC power supply to the DC traction power supply network is at least two times, preferably at least three times and most preferably at least four times less than the maximal electric power delivered by the traction substation continuously.
An advantage of the DC traction power supply system, according to the invention, is that the existing infrastructure, in particular a traction substation, can further be used and thus previous investments are utilised and protected. It also provides the possibility to place the distributed DC power supply at, or close to, locations where the DC traction power supply system shows electrical instabilities. By placing the distributed DC power supply at those places, the overall DC traction power supply system is less stressed and has a more even voltage profile compared with the conventional solution of replacing an existing traction substation with a more powerful traction substation. Furthermore, the DC traction power supply network is less stressed which also results in lower costs as fewer investments are needed into the DC traction power supply network, e.g. fewer overhead line upgrades or the like are needed.
Further, due to the electrically and thus physically smaller size of the distributed DC power supply compared to the traction substation, the distributed DC power supply requires less land. This results in the possibility that the distributed DC power supply might be placed on land already owned by the DC traction power supply system operators or at least less land must be acquired compared to the land requirement of a traction substation.
According to an embodiment of the invention, the at least one distributed DC power supply is placed at a location of increased power demand of the DC traction power supply network.
This embodiment has the advantage that, since the distributed power supply is closer to the electric powered traction vehicles requiring power, there is less current flowing long distances in the overhead lines, which results in less energy losses and thus in lower costs.
Further, as the at least one distributed DC power supply is placed at the location of increased power demand, the DC traction power supply network itself does not need to be changed to transport the required energy to the location of increased power demand. The DC traction power supply network itself might be limiting the available maximal power at a certain location, in particular if the location is remote from the traction substation.
According to a further embodiment, the at least one distributed DC power supply is installed at a stop for the traction vehicles at an ascending section of the track on which the traction vehicles operates and/or at a ‘turn around’ point for the traction vehicles.
This embodiment has the advantage that the distributed DC power supply is placed where the DC traction power supply network typically shows instabilities, as new traction vehicles have a higher energy consumption during acceleration compared to traction vehicles available at the time the DC traction power supply system was planned and built. In particular for the case of the tram stop or turn around point, it has the further advantage that the distributed DC power supply can be placed on a site already available to the operator of the DC traction power supply system, which results in lower overall costs.
According to an embodiment of the invention, the DC traction power supply system comprises at least five distributed DC power supplies, preferable at least ten distributed DC power supplies and more preferably at least twenty distributed DC power supplies.
This embodiment has the advantage that comparatively electrically and thus also physically small distributed DC power supplies might be placed at the places where the DC traction power supply system shows electrical instabilities.
According to a further embodiment, the DC traction power supply system comprises a plurality of traction substations, and at least five distributed DC power supplies are installed per traction substation, preferable at least ten distributed DC power supplies are installed per traction substation and more preferably at least twenty distributed DC power supplies are installed per traction substation.
As in the previous embodiment, this embodiment has the advantage that comparatively electrically and thus also physically small distributed DC power supplies might be placed at the places where the DC traction power supply system shows electrical instabilities.
According to a further embodiment, the at least one distributed DC power supply is powered by an AC grid.
This embodiment has the advantage that energy from an AC grid can be fed into the DC traction power supply network. It therefore allows each distributed DC power supply to be electrically and thus also physically quite small.
According to a further embodiment, the at least one distributed DC power supply comprises energy storage and is thus powered by the DC traction power supply network.
This embodiment has the advantage that the connection to the DC traction power supply network is used for providing electrical energy to the distributed DC power supply as well as for feeding electrical energy from the distributed DC power supply into the DC traction power supply network. No additional connection to another grid is necessary. Thus, this embodiment has the advantage that it can be used also at places where no other electrical energy source is available.
According to a further embodiment of the invention, the at least one distributed DC power supply is connected to the DC traction power supply network by a cable, and wherein the length of the cable is less than one hundred meters.
According to a further aspect of the invention, a housing for electric and/or electronic components is provided, preferably a housing for a distributed DC power supply which is connected to the DC traction power supply system. The housing comprises a first enclosure to be placed at ground level, a second enclosure to be placed above ground level and a support structure for supporting the second enclosure, wherein the first enclosure and the second enclosure is for housing at least a switchgear, a power converter and power transformer.
This inventive solution has the advantage that only a very small footprint is needed to install the housing, preferably the first enclosure placed at ground level can be placed on the ground, partly in the ground or completely in the ground. In case it is only placed partly in the ground it might be used as a base, e.g. for a bench or the like at a tram stop. The second enclosure is placed above ground level and does thus not make use of scarcely available space, preferably at a tram stop.
According to a further embodiment, the support structure is formed by a pole.
According to a further embodiment, the support structure is for placing the second enclosure at least two meters above ground.
This embodiment has the advantage that the second enclosure is placed high enough that people can stand next to the support structure and the available space can be used very efficiently.
According to a further aspect of the invention, a distributed DC power supply for providing traction power to electric powered traction vehicles is provided. Preferably a distributed DC power supply to be installed in a DC traction power supply system is provided. The distributed DC power supply comprises a housing for the electric and/or electronic components, wherein the first enclosure and the second enclosure comprise at least a switchgear, a power converter and a power transformer.
According to a further embodiment, the switchgear is placed in the first enclosure, the power transformer is placed in the second enclosure and the power converter is placed in one of the first enclosure and the second enclosure.
According to a further embodiment, the switchgear is direct current switchgear.
According to a further embodiment, the power converter is a rectifier.
According to a further embodiment, the power converter is a diode bridge rectifier. This embodiment has the advantage that a cost efficient solution can be provided.
According to a further embodiment, the power converter is a thyristor controlled rectifier. This embodiment has the advantage that a cost efficient solution can be provided and that there can be greater control of network characteristics close to the distributed DC power supply.
According to a further embodiment, the rectifier is an active rectifier controlled by pulse with modulation. This embodiment has the advantage that there can be greater control of network characteristics at the output of the rectifier. Furthermore, the harmonics injected into an AC grid, which provides energy to the active rectifier, can be controlled.
Further embodiments are specified in the further dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter of the invention will be explained in more detail in the following text, with reference to preferred exemplary embodiments which are illustrated in the attached purely schematic drawings, in which:
Fig. 1 shows a DC traction power supply system according to the invention;
Fig. 2 shows a first embodiment of a distributed DC power supply as well as a housing for such a distributed DC power supply; and
Fig. 3 shows a second embodiment of the distributed DC power supply as well as its housing.
In principle, identical or functionally identical parts are provided with the same reference symbols in the figures. The described exemplary embodiments represent, by way of example, the subject matter of the invention and has no restrictive effect.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 shows a DC traction power supply system 10. In the above sections of the document and in the following sections, DC is an acronym for ‘direct current’. The DC traction power supply system 10 comprises a traction substation 12 which provides electrical energy to a DC traction power supply network 14. The DC traction power supply network 14 connected to the traction substation 12 comprises a first line 16 and a second line 18. The first line 16 is typically a rail of the track or might also be an overhead line, for example, in case a trolleybus is connected to it. The second line 18 is typically an overhead line or a third rail, for example, as typically used by rapid transit, also known as metro, subway or underground. The DC traction power supply network is for providing electrical energy from the traction substation 12 to an electrically driven traction vehicle such as a train, tram, metro, trolleybus, railcar etc.
Further, Fig. 1 shows distributed DC power supplies 20. Each distributed DC power supply 20 is connected to the DC traction power supply network 14 by a cable 19, the length of which should be short but might have a length, for example, of up to 100m. The distributed DC power supply 20 is for providing electrical energy to the DC traction power supply network, in particular in case the DC traction power supply network is locally or temporally overloaded. The electrically and thus also physically size of the distributed DC power supply 20 is quite small compared to the traction substation 12, in particular the maximal electric power delivered continuously by the distributed DC power supply 20 is at least two times less than the maximal electric power delivered by the traction substation 12 continuously.
For example, the traction substation in a tram network might deliver continuously l’200kW and up to 3’600kW for a short time of some seconds. The distributed DC power supply might deliver continuously 300kW and up to 900kW for a short time of some seconds.
Fig. 1 further shows that more than one distributed DC power supply 20, for example two distributed DC power supplies 20 as shown in the figure, can be installed per traction substation 12 in order to increase the locally available energy on the power supply network 14.
The electrical power for the distributed DC power supply 20 might be provided by an AC grid, such as the electrical distribution grid of a city. Alternatively, the electrical power could also be provided by the DC traction power supply network 14. This would require that the distributed DC power supply 20 is equipped with an energy storage solution so that electrical energy can be taken from the DC traction power supply network 14, when there is excess energy available in the DC traction power supply network, and can be provided to the DC traction power supply network 14 in case it is locally in an electrically unstable condition.
In case the distributed DC power supply is equipped with an energy storage solution, such a system might be placed in a cabinet which is placed in the ground or on the ground.
As shown in Fig. 1, the distributed DC power supply is preferably installed at a station or stop 32 for the traction vehicle as the instabilities in the DC traction power supply network 14 occur typically where the traction vehicle must accelerate from standstill to full speed. Further, the operator of the network typically owns the real estate at the stop and therefore no additional costs arise related to acquiring real estate when installing a new distributed DC power supply. As discussed above, the distributed DC power supply 20 might be installed as an addition to the traction substation 12 in case the DC traction power supply network 14 shows electrical instabilities, which might occur due to increased energy requirements of a greater number of traction vehicles and of newer traction vehicles. Further, the distributed DC power supply might be placed at other locations of the DC traction power supply network than the stop, which also have an increased power demand, such as an ascending sections of the track going up a hill or a turn point for the traction vehicles at the end of the line.
Fig. 2 shows a first embodiment of a distributed DC power supply 20. The distributed DC power supply 20 comprises a housing 62 for electric and/or electronic components as well as the electric and/or electronic components.
The housing comprises a first enclosure 64 which is mounted at ground level 66. The ground level might for example be formed by a road or by a pavement. The first enclosure 64 might be placed completely below the ground level 66. Alternatively, its upper face might form part of the road or pavement. In another alternative, the first enclosure might only be placed partly in the ground. In another alternative, the first enclosure might be placed on the ground.
The housing 62 further comprises a second enclosure 68 which is mounted above ground and which is carried by a pole 70’ forming a support structure 70 for the second enclosure 68. In an alternative embodiment, the support structure might be formed by a shelter placed at a tram stop or the like. Further, a combination of a shelter and a pole for the support structure is also possible. The second enclosure 68 is placed at least 2 meters above ground level, or in other words the second enclosure 68 is placed at least 2 meters above the road or pavement.
The distributed DC power supply 20 shown in Fig. 2 comprises switchgear 80, in particular DC switchgear. The switchgear 80 is placed in the first enclosure 64. Further, the distributed DC power supply 20 comprises an oil transformer 82 which is placed in the second enclosure 68. Further, the distributed DC power supply 20 comprises a power converter 84, in particular a rectifier, which is also placed in the second enclosure 68. Alternatively, as shown in Fig. 3, the power converter 84 might also be placed in the first enclosure 64. It might also be possible to place the switchgear, the transformer and the power converter in the first enclosure or the second enclosure.
The transformer 82 is connected on its input side to an AC power source which is not further described here. It might be an AC distribution grid as typically available in cities. The transformer 82 is connected on its output side to the rectifier 84. The rectifier 84 is connected on its DC side to the switchgear 80, by which the distributed DC power supply 20 can be connected and disconnected from the DC traction power supply network 14.
Instead of the oil transformer also a transformer of the dry type might be used.
In case the rectifier 84 is placed in the second enclosure as shown in Fig. 2, the power converter might be cooled by oil which is also used for cooling and insulating the transformer. An air cooling solution might also be possible.
The power converter 84 might be formed by a diode-bridge rectifier, a thyristor controlled rectifier or by an active power converter. The active power converter might be a pulse width modulated power converter. Further, the active power converter might be of the buck and/or boost converter type for actively adapting its output voltage on the DC side.
List of reference symbols: 10 DC traction power supply system 12 traction substation 14 DC traction power supply network 16 first line 18 second line 19 cable 20 distributed DC power supplies 32 station or stop 62 housing 64 first enclosure 66 ground level 68 second enclosure 70 support structure 70’ pole 80 switchgear 82 transformer 84 power converter
Claims (18)
- PATENT CLAIMS1. DC traction power supply system (10) comprising - a traction substation (12) and - a DC traction power supply network (14) connected to the traction substation (12), the DC traction power supply system provides electrical energy, which is supplied by the traction substation (12), to traction vehicles connected to the DC traction power supply network (14), wherein the DC traction power supply system (10) comprises at least one distributed DC power supply (20) connected to the DC traction power supply network (14) for providing electrical energy to the DC traction power supply network (14), and wherein the maximal electric power delivered continuously by the distributed DC power supply (20) to the DC traction power supply network (14) is at least two times, preferably at least three times and most preferably at least four times less than the maximal electric power delivered by the traction substation (12) continuously.
- 2. DC traction power supply system (10) according to claim 1, wherein the at least one distributed DC power supply (20) is placed at a location of increased power demand of the DC traction power supply network (14).
- 3. DC traction power supply system according to claim 1 or 2, wherein the at least one distributed DC power supply (20) is installed at a stop (32) for the traction vehicles, at an ascending section of the track on which the traction vehicles operates and/or at a turn around point for the traction vehicles.
- 4. DC traction power supply system according to one of the claims 1 to 3, wherein the DC traction power supply system (10) comprises at least five distributed DC power supplies (20), preferable at least ten distributed DC power supplies (20) and more preferably at least twenty distributed DC power supplies (20).
- 5. DC traction power supply system according to claim 4, wherein the DC traction power supply system (10) comprises a plurality of traction substations (12), and wherein at least five distributed DC power supplies (20) are installed per traction substation (12), preferable at least ten distributed DC power supplies (20) are installed per traction substation (12) and more preferably at least twenty distributed DC power supplies (20) are installed per traction substation (12).
- 6. DC traction power supply system (10) according to one of the claim 1 to 5, wherein the at least one distributed DC power supply (20) is connected to the DC traction power supply network (14) by a cable, and wherein the length of the cable (19) is less than one hundred meters.
- 7. DC traction power supply system according to one of the claims 1 to 6, wherein the at least one distributed DC power supply (20) is powered by an AC grid.
- 8. DC traction power supply system according to one of the claims 1 to 6, wherein the at least one distributed DC power supply (20) comprises an energy storage and is powered by the DC traction power supply network (14).
- 9. Housing (62) for electric and/or electronic components, preferably for a distributed DC power supply (20) of the DC traction power supply system according to one of the claims 1 to 8, comprising a first enclosure (64) to be placed at ground level (66), a second enclosure (68) to be placed above ground level (66) and a support structure (70) for supporting the second enclosure (68), wherein the first enclosure (64) and the second enclosure (68) is for housing at least a switchgear (80), a power converter (84) and power transformer (82).
- 10. Housing according to claim 9, wherein the first enclosure (64) is to be placed on the ground.
- 11. Housing according to claim 9 or 10, wherein the support structure (70) is a pole (70’).
- 12. Housing according to one of the claims 9 to 11, wherein the support structure (20) is for placing the second enclosure (68) at least 2 meters above ground.
- 13. Distributed DC power supply (20) for providing traction power to electric powered traction vehicles, preferably a distributed DC power supply to be installed in a DC traction power supply system according to one of the claims 1 to 8, the distributed DC power supply (20) comprises a housing (62) for the electric and/or electronic components according to one of the claims 9 to 12, wherein the first enclosure (64) and the second enclosure (68) comprise at least a switchgear (80), a power converter (84) and power transformer (82).
- 14. Distributed DC power supply according to claim 13, wherein the switchgear (80) is placed in the first enclosure (64), the power transformer (82) is placed in the second enclosure (68) and the power converter (84) is placed in one of the first enclosure (64) and the second enclosure (68).
- 15. Distributed DC power supply according to claim 13 or 14, wherein the power converter (84) is a rectifier.
- 16. Distributed DC power supply according to claim 13 or 14, wherein the power converter (84) is a diode bridge rectifier.
- 17. Distributed DC power supply according to claim 13 or 14, wherein the power converter (84) is an active rectifier controlled by pulse width modulation.
- 18. Distributed DC power supply according to claim 13 or 14, wherein the power converter (84) is a thyristor controlled rectifier.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP15180613.0 | 2015-08-11 | ||
| EP15180613 | 2015-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2016101444A4 true AU2016101444A4 (en) | 2016-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2016101444A Expired AU2016101444A4 (en) | 2015-08-11 | 2016-08-11 | DC traction power supply system, distributed DC power supply and a respective housing |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206186825U (en) |
| AU (1) | AU2016101444A4 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336727A (en) * | 2018-01-23 | 2018-07-27 | 西南交通大学 | A kind of new energy supply system and control method for through traction power supply |
| CN109532568A (en) * | 2019-01-09 | 2019-03-29 | 西南交通大学 | A kind of three rail electric power supply control system of electric railway train |
| CN109532572A (en) * | 2019-01-09 | 2019-03-29 | 西南交通大学 | A kind of five rail electric power supply control system of short stator magnetic-levitation train |
| CN113300349A (en) * | 2021-05-31 | 2021-08-24 | 湖南铁道职业技术学院 | Subway traction power supply method and system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115742887B (en) * | 2022-12-20 | 2024-09-17 | 中铁电气化局集团有限公司 | Multisource interconnection traction power supply system and method for railway through in-phase power supply transformation |
-
2016
- 2016-08-11 CN CN201621205075.4U patent/CN206186825U/en active Active
- 2016-08-11 AU AU2016101444A patent/AU2016101444A4/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336727A (en) * | 2018-01-23 | 2018-07-27 | 西南交通大学 | A kind of new energy supply system and control method for through traction power supply |
| CN108336727B (en) * | 2018-01-23 | 2023-11-24 | 西南交通大学 | New energy supply system for through traction power supply and control method |
| CN109532568A (en) * | 2019-01-09 | 2019-03-29 | 西南交通大学 | A kind of three rail electric power supply control system of electric railway train |
| CN109532572A (en) * | 2019-01-09 | 2019-03-29 | 西南交通大学 | A kind of five rail electric power supply control system of short stator magnetic-levitation train |
| US12109914B2 (en) | 2019-01-09 | 2024-10-08 | Southwest Jiaotong University | Three-rail power supply control system for electrified railway train |
| CN113300349A (en) * | 2021-05-31 | 2021-08-24 | 湖南铁道职业技术学院 | Subway traction power supply method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN206186825U (en) | 2017-05-24 |
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| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |