CN216959329U - Railway direct current source double-cascade access system - Google Patents
Railway direct current source double-cascade access system Download PDFInfo
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- CN216959329U CN216959329U CN202220069229.0U CN202220069229U CN216959329U CN 216959329 U CN216959329 U CN 216959329U CN 202220069229 U CN202220069229 U CN 202220069229U CN 216959329 U CN216959329 U CN 216959329U
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Abstract
The utility model discloses a railway direct-current source double-cascade access system which comprises an isolation type cascade parallel railway energy router, wherein the isolation type cascade parallel railway energy router comprises a plurality of isolation type cascade railway energy routing modules which are connected in parallel, and the isolation type cascade parallel railway energy router is bridged on a traction network. The utility model can reduce the rated capacity and tolerance level of the power electronic device; the modular number can be flexibly configured according to the system capacity requirement, so that the system utilization rate is improved, a proper amount of redundancy can be configured, and the fault-tolerant capability of the system is improved; the voltage level of photovoltaic, wind power and other renewable energy source systems can be reduced by adopting the isolation transformer.
Description
Technical Field
The utility model belongs to the technical field of electrified railways, and particularly relates to a railway direct-current source double-cascade access system.
Background
By the end of 2021, the operation mileage of the high-speed rail of our country is over 4 kilometers, the total operation mileage of the whole year is over 15 kilometers, and the electrified railway system is still one of the key fields of carbon emission. A large amount of regenerative braking energy is generated in the braking process of the power locomotive, and usually, after the regenerative braking energy is consumed by the same-arm traction motor train unit and the traction power supply equipment, 50% of the regenerative braking energy is still returned to an external power grid; further resulting in low system energy efficiency, poor economy, and increased power quality issues. The returned regenerative braking energy is three-phase asymmetric, which causes the problems of network voltage fluctuation, harmonic wave, negative sequence and the like of the power grid.
Meanwhile, the phenomenon of wind and light abandonment frequently occurs frequently, which results in low utilization rate of renewable energy, and contradicts with the vision of 'carbon neutralization'. The students can absorb the electric energy generated by photovoltaic and wind power and recover the regenerative braking energy, and the students can access the renewable energy sources such as photovoltaic and wind power to the railway energy router system on the middle direct current side of the back-to-back converter, so that the electric energy quality of the three-phase power grid can be effectively improved.
However, the current research mainly focuses on centralized topology regulation, and the centralized railway energy router has large capacity and has severe requirements on the rated capacity and tolerance level of power electronic devices; moreover, the centralized structure does not have local fault-tolerant capability, which is not beneficial to engineering application, and if some local elements are abnormal or have faults, the whole device needs to be switched off for operation. Therefore, the prior art cannot fully exert the function of the railway energy router.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a railway direct-current source double-cascade access system which can reduce the rated capacity and tolerance level of power electronic devices; the modular number can be flexibly configured according to the system capacity requirement, so that the system utilization rate is improved, a proper amount of redundancy can be configured, and the fault-tolerant capability of the system is improved; the voltage level of photovoltaic, wind power and other renewable energy source systems can be reduced by adopting the isolation transformer.
In order to realize the purpose, the utility model adopts the technical scheme that: a railway direct-current source double-cascade access system comprises an isolation type cascade parallel railway energy router accessed to a direct-current source, wherein the isolation type cascade parallel railway energy router comprises a plurality of isolation type cascade railway energy routing modules which are connected in parallel, and the isolation type cascade parallel railway energy router is bridged on a traction network.
Furthermore, the isolated cascading railway energy routing module comprises a plurality of groups of embedded cascading back-to-back converter subsystems, and each embedded cascading back-to-back converter subsystem is provided with an isolation transformer and a direct current source;
one end or two ends of each embedded cascade back-to-back converter subsystem are connected to a traction network through an isolation transformer; the primary windings of the isolation transformers are connected in series and then connected to a traction network, and the secondary windings of the isolation transformers are connected with one end of a group of embedded cascade back-to-back converter subsystems;
and each embedded cascade back-to-back converter subsystem is provided with a direct current source.
Furthermore, the traction network comprises an alpha power supply arm, a beta power supply arm and a steel rail of a traction substation or a subarea station, and two ends of the plurality of isolated cascade railway energy routing modules are bridged between the alpha power supply arm, the beta power supply arm and the steel rail of the traction substation or the subarea station after being connected in parallel.
Furthermore, the isolated cascading railway energy routing module comprises a plurality of groups of embedded cascading back-to-back converter subsystems, alpha-side isolation transformers and beta-side isolation transformers configured for each embedded cascading back-to-back converter subsystem, and a direct current source I;
primary windings of the alpha-side isolation transformers are connected in series and then are respectively connected between the alpha power supply arm and the steel rail, and secondary windings of the alpha-side isolation transformers are connected with one end of a group of embedded cascade back-to-back converter subsystems;
primary windings of the beta-side isolation transformers are connected in series and then are respectively connected between the beta power supply arm and a steel rail, and secondary windings of the beta-side isolation transformers are connected with the other end of the embedded cascade back-to-back converter subsystem;
and each embedded cascade back-to-back converter subsystem is provided with a direct current source I.
Furthermore, the isolated cascading railway energy routing module comprises a plurality of groups of embedded cascading back-to-back converter subsystems, alpha-side isolation transformers configured for each embedded cascading back-to-back converter subsystem, and a direct current source II;
primary windings of the alpha-side isolation transformers are connected in series and then are respectively connected between the alpha power supply arm and the steel rail, and secondary windings of the alpha-side isolation transformers are connected with one end of a group of embedded cascade back-to-back converter subsystems; the other ends of the embedded cascade back-to-back converter subsystems of each group are connected in series and then connected between the beta power supply arm and the steel rail;
and a direct current source II is configured on each embedded cascade back-to-back converter subsystem.
Furthermore, the isolated cascading railway energy routing module comprises a plurality of groups of embedded cascading back-to-back converter subsystems, a plurality of three-winding isolated voltage transformation, a direct current source I and a direct current source II, wherein the three-winding isolated voltage transformation is arranged on the alpha side of each embedded cascading back-to-back converter subsystem;
primary windings of the three-winding isolation transformers on the alpha side are connected in series and then are respectively connected between the alpha power supply arm and the steel rail; a first secondary winding of each alpha-side three-winding isolation voltage transformation is connected with one end of a group of embedded cascade back-to-back converter subsystems, and a second secondary winding is connected with a direct current source I through an AC/DC converter; the other ends of the embedded cascade back-to-back converter subsystems are connected in series and then connected between the beta power supply arm and the steel rail;
and a direct current source II is configured on each embedded cascade back-to-back converter subsystem.
Further, the embedded cascade back-to-back converter subsystem comprises a plurality of groups of single-phase back-to-back converters; the converters I at one end of each group of single-phase back-to-back converters are connected in series, and the converters II at the other end of each group of single-phase back-to-back converters are connected in series to form an embedded cascade back-to-back converter subsystem; the middle direct current loops of the single-phase back-to-back converters are connected through a common capacitor, and a direct current source is connected to the common capacitor in parallel; and a bypass switch I is arranged at the outer end of the converter I, and a bypass switch II is arranged at the outer end of the converter II.
Further, the system also comprises a central controller which is used for detecting data of the traction network and data of the direct current source in real time, and the central controller controls each control switch and/or converter to realize system coordination control.
Further, the direct current source II comprises an energy storage system, a photovoltaic system and/or a fan system which are connected to the direct current bus.
Further, the direct current source I comprises an energy storage system, a photovoltaic system and/or a fan system which are connected to the direct current bus.
The beneficial effects of the technical scheme are as follows:
the utility model adopts a structure of cascading a plurality of isolation transformers, can reduce the requirement on the capacity of a single transformer, further reduce the system cost and simultaneously play a role in transformer isolation.
The utility model adopts a structure of cascading a plurality of back-to-back converters, which can reduce the strict requirements on the rated capacity and tolerance level of the power electronic device; meanwhile, the highly modular structure can flexibly configure different quantities according to the actual capacity requirement of the project, thereby improving the utilization rate of the system; and the high-modularization structure can not cause the whole device to be switched out and operated due to the abnormity or the fault of a local component, thereby improving the fault-tolerant capability of the system.
The utility model can reduce the voltage level of the photovoltaic, wind power and other renewable energy systems by adopting the isolation transformer.
Drawings
Fig. 1 is a schematic structural diagram of a railway direct current source dual cascade access system according to the present invention;
FIG. 2 is a first topology structure diagram of a cascaded railway energy routing module according to an embodiment of the present invention;
fig. 3 is a topological structure diagram of a second cascaded railway energy routing module according to an embodiment of the present invention;
FIG. 4 is a topological structure diagram of a third cascaded railroad energy routing module according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a DC source I according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of the dc source II according to the embodiment of the present invention.
The system comprises a power supply unit, a power supply unit and a controller, wherein 1 is an alpha power supply arm, 2 is an isolated cascade parallel railway energy router, 3 is a beta power supply arm, 4 is a steel rail, 5 is a central controller, 6 is a direct current source I, and 7 is a direct current source II;
21 is an embedded cascade back-to-back converter subsystem, 22 is an alpha-side isolation transformer, 23 is a beta-side isolation transformer, 24 is an alpha-side three-winding isolation transformation, 211 is a converter I, 212 is a converter II, 213 is a bypass switch I, and 214 is a bypass switch II;
61 is a direct current bus of a direct current source I, 62 is an energy storage system of the direct current source I, 63 is a photovoltaic system of the direct current source I, and 64 is a fan system of the direct current source I;
71 is a direct current bus of the direct current source II, 72 is an energy storage system of the direct current source II, 73 is a photovoltaic system of the direct current source II, and 74 is a fan system of the direct current source II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described below with reference to the accompanying drawings.
In this embodiment, referring to fig. 1, a railway direct-current source dual-cascade access system includes an isolated cascade parallel railway energy router 2 connected to a direct-current source, where the isolated cascade parallel railway energy router 2 includes a plurality of isolated cascade railway energy routing modules connected in parallel, and the isolated cascade parallel railway energy router 2 is bridged over a traction network.
As an optimization scheme of the above embodiment, the isolated cascade-type railway energy routing module includes a plurality of groups of embedded cascade back-to-back converter subsystems 21, an isolation transformer configured for each embedded cascade back-to-back converter subsystem 21, and a dc source 7;
one end or two ends of each embedded cascade back-to-back converter subsystem 21 are connected to a traction network through an isolation transformer; the primary windings of the isolation transformers are connected in series and then connected to a traction network, and the secondary windings of the isolation transformers are connected with one end of a group of embedded cascade back-to-back converter subsystems 21;
a dc source is arranged on each embedded cascaded back-to-back converter subsystem 21.
The traction network comprises an alpha power supply arm 1, a beta power supply arm 3 and a steel rail 4 of a traction substation or a zoning station, and two ends of a plurality of isolated type cascading railway energy routing modules are bridged between the alpha power supply arm 1, the beta power supply arm 3 and the steel rail 4 of the traction substation or the zoning station after being connected in parallel.
In an optimized embodiment 1, as shown in fig. 2, the isolated type cascaded railway energy routing module includes a plurality of sets of embedded cascaded back-to-back converter subsystems 21, an α -side isolation transformer 22 and a β -side isolation transformer 23 configured for each embedded cascaded back-to-back converter subsystem 21, and a dc source I6;
the primary windings of the alpha-side isolation transformers 22 are connected in series and then are respectively connected between the alpha power supply arm 1 and the steel rail 4, and the secondary winding of each alpha-side isolation transformer 22 is connected with one end of a group of embedded cascade back-to-back converter subsystems 21;
primary windings of the beta-side isolation transformers 23 are connected in series and then are respectively connected between the beta power supply arm 3 and the steel rail 4, and secondary windings of the beta-side isolation transformers 23 are connected with the other end of the embedded cascade back-to-back converter subsystem 21;
a dc source I6 is configured on each embedded cascaded back-to-back converter subsystem 21.
In an optimized embodiment 2, as shown in fig. 3, the isolated cascade-type railway energy routing module includes a plurality of sets of embedded cascade back-to-back converter subsystems 21, an α -side isolation transformer 22 configured for each embedded cascade back-to-back converter subsystem 21, and a dc source II 7;
the primary windings of the alpha-side isolation transformers 22 are connected in series and then are respectively connected between the alpha power supply arm 1 and the steel rail 4, and the secondary winding of each alpha-side isolation transformer 22 is connected with one end of a group of embedded cascade back-to-back converter subsystems 21; the other ends of the embedded cascade back-to-back converter subsystems 21 are connected in series and then connected between the beta power supply arm 3 and the steel rail 4;
and a direct current source II7 is arranged on each embedded cascade back-to-back converter subsystem 21.
In an optimized embodiment 3, as shown in fig. 4, the isolated cascade-type railway energy routing module includes a plurality of sets of embedded cascade back-to-back converter subsystems 21, n three-winding isolation transformers 24 on an α side configured by each embedded cascade back-to-back converter subsystem 21, a dc source I6, and a dc source II 7;
primary windings of the alpha-side three-winding isolation transformers 24 are connected in series and then are respectively connected between the alpha power supply arm 1 and the steel rail 4; the first secondary winding of each alpha-side three-winding isolation transformer 24 is connected with one end of a group of embedded cascade back-to-back converter subsystems 21, and the second secondary winding is connected with a direct current source I6 through an AC/DC converter 216; the other ends of the embedded cascade back-to-back converter subsystems 21 are connected in series and then connected between the beta power supply arm 3 and the steel rail 4;
and a direct current source II7 is arranged on each embedded cascade back-to-back converter subsystem 21.
The embedded cascade back-to-back converter subsystem 21 comprises a plurality of groups of single-phase back-to-back converters; the converters I211 at one end of each group of single-phase back-to-back converters are connected in series, and the converters II212 at the other end of each group of single-phase back-to-back converters are connected in series to form an embedded cascade back-to-back converter subsystem; the middle direct current loops of the single-phase back-to-back converters are connected through a common capacitor 215, and a direct current source II7 is connected to the common capacitor 215 in parallel; a bypass switch I213 is provided at the outer end of the inverter I211, and a bypass switch II214 is provided at the outer end of the inverter II 212.
As shown in fig. 5, the dc source I6 includes, but is not limited to, an energy storage system 62 connected to the dc bus 61, a photovoltaic system 63, a fan system 64, and/or other power sources or loads.
The energy storage system 62 includes a bidirectional energy converter 622 and an energy storage device 623 or only an energy storage device 621; the photovoltaic system 63 comprises a photovoltaic array 632 and a DC/DC converter 631; the wind power system 64 includes a fan system 643 and an AC/DC rectifier 642, or a fan system 641 that directly outputs direct current power.
The medium of the energy storage device comprises one or more mixed energy storage media of storage battery energy storage, superconducting energy storage, super capacitor energy storage, flywheel energy storage, flow battery and the like.
As shown in fig. 6, the dc source II7 includes, but is not limited to, an energy storage system 72 connected to the dc bus 71, a photovoltaic system 73, a fan system 74, and/or other power sources or loads.
The energy storage system 72 includes a bidirectional energy converter 722 and an energy storage device 723 or only an energy storage device 721; the photovoltaic system 73 includes an AC/DC rectifier 731, an isolation transformer 732, a DC/AC converter (733), and a photovoltaic array 734; the wind power system 74 includes an AC/DC rectifier 741, an isolation transformer 742, a DC/AC converter 743, and a fan system 744, or a fan system 747, an isolation transformer 747, and an AC/DC converter 745.
Preferably, the medium of the energy storage device includes, but is not limited to, one or more of a storage battery energy storage medium, a superconducting energy storage medium, a super capacitor energy storage medium, a flywheel energy storage medium, a flow battery and the like.
As an optimization scheme of the above embodiment, the system further comprises a central controller 5 for detecting data of the traction network and data of the direct current source in real time, and the central controller 5 controls each control switch and/or converter to realize system coordination control.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. The railway direct-current source double-cascade access system is characterized by comprising an isolation type cascade parallel railway energy router (2) connected to a direct-current source, wherein the isolation type cascade parallel railway energy router (2) comprises a plurality of isolation type cascade railway energy routing modules which are connected in parallel, and the isolation type cascade parallel railway energy router (2) is bridged on a traction network.
2. The railway direct-current source double-cascade access system as claimed in claim 1, wherein the isolated cascaded railway energy routing module comprises a plurality of groups of embedded cascaded back-to-back converter subsystems (21), each embedded cascaded back-to-back converter subsystem (21) is provided with an isolation transformer and a direct-current source;
one end or two ends of each embedded cascade back-to-back converter subsystem (21) are connected to a traction network through an isolation transformer; the primary windings of the isolation transformers are connected in series and then connected to a traction network, and the secondary windings of the isolation transformers are connected with one end of a group of embedded cascade back-to-back converter subsystems (21);
and each embedded cascade back-to-back converter subsystem is provided with a direct current source.
3. The railway direct-current source double-cascade access system according to claim 2, wherein the traction network comprises an alpha power supply arm (1), a beta power supply arm (3) and a steel rail (4) of a traction substation or a zoning station, and after being connected in parallel, a plurality of isolation type cascade railway energy routing modules are connected in parallel, two ends of each isolation type cascade railway energy routing module are bridged among the alpha power supply arm (1), the beta power supply arm (3) and the steel rail (4) of the traction substation or the zoning station.
4. The railway direct-current source double-cascade access system as claimed in claim 3, wherein the isolated cascade railway energy routing module comprises a plurality of groups of embedded cascade back-to-back converter subsystems (21), an alpha-side isolation transformer (22) and a beta-side isolation transformer (23) configured for each embedded cascade back-to-back converter subsystem (21), and a direct-current source I (6);
primary windings of the alpha-side isolation transformers (22) are connected in series and then are respectively connected between the alpha power supply arm (1) and the steel rail (4), and secondary windings of the alpha-side isolation transformers (22) are connected with one end of a group of embedded cascade back-to-back converter subsystems (21);
primary windings of the beta-side isolation transformers (23) are connected in series and then are respectively connected between the beta power supply arm (3) and the steel rail (4), and secondary windings of the beta-side isolation transformers (23) are connected with the other end of the embedded cascade back-to-back converter subsystem (21);
and a direct current source I (6) is configured on each embedded cascade back-to-back converter subsystem (21).
5. The railway direct-current source double-cascade access system as claimed in claim 3, wherein the isolated cascade railway energy routing module comprises a plurality of groups of embedded cascade back-to-back converter subsystems (21), alpha-side isolation transformers (22) configured for each embedded cascade back-to-back converter subsystem (21), and a direct-current source II (7);
primary windings of the alpha-side isolation transformers (22) are connected in series and then are respectively connected between the alpha power supply arm (1) and the steel rail (4), and secondary windings of the alpha-side isolation transformers (22) are connected with one end of a group of embedded cascade back-to-back converter subsystems (21); the other ends of the embedded cascade back-to-back converter subsystems (21) are connected in series and then connected between the beta power supply arm (3) and the steel rail (4);
and a direct current source II (7) is configured on each embedded cascade back-to-back converter subsystem (21).
6. The railway direct-current source double-cascade access system as claimed in claim 3, wherein the isolated cascaded railway energy routing module comprises a plurality of sets of embedded cascaded back-to-back converter subsystems (21), an alpha-side three-winding isolation transformer (24) configured for each embedded cascaded back-to-back converter subsystem (21), a direct-current source I (6), and a direct-current source II (7);
primary windings of the alpha-side three-winding isolation transformers (24) are connected in series and then are respectively connected between the alpha power supply arm (1) and the steel rail (4); a first secondary winding of each alpha-side three-winding isolation transformer (24) is connected with one end of a group of embedded cascade back-to-back converter subsystems (21), and a second secondary winding is connected with a direct-current source I (6) through an AC/DC converter (216); the other ends of the embedded cascade back-to-back converter subsystems (21) are connected in series and then connected between the beta power supply arm (3) and the steel rail (4);
and a direct current source II (7) is configured on each embedded cascade back-to-back converter subsystem (21).
7. The railway direct current source double cascade access system according to any one of claims 2 to 6, wherein the embedded cascade back-to-back converter subsystem (21) comprises a plurality of groups of single-phase back-to-back converters; the converters I (211) at one end of each group of single-phase back-to-back converters are connected in series, and the converters II (212) at the other end of each group of single-phase back-to-back converters are connected in series, so that an embedded cascade back-to-back converter subsystem is formed; the middle direct current loops of the single-phase back-to-back converters are connected through a common capacitor (215), and a direct current source is connected to the common capacitor (215) in parallel; a bypass switch I (213) is arranged at the outer end of the current transformer I (211), and a bypass switch II (214) is arranged at the outer end of the current transformer II (212).
8. The railway direct current source double cascade access system according to any one of claims 2 to 6, characterized by further comprising a central controller (5) for detecting data of a traction network and direct current source data in real time, and controlling each control switch and/or converter by the central controller (5) to realize system coordination control.
9. A railway DC source double cascade access system according to any of claims 5 or 6, characterized in that the DC source II (7) comprises one or more of an energy storage system (72) of the DC source II connected to a DC bus (71) of the DC source II, a photovoltaic system (73) of the DC source II and/or a fan system (74) of the DC source II.
10. The railway DC source double cascade access system according to claim 4 or 6, characterized in that the DC source I (6) comprises one or more of an energy storage system (62) of the DC source I connected to a DC bus (61) of the DC source I, an I photovoltaic system (63) of the DC source I and/or a fan system (64) of the DC source I.
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| CN202220069229.0U CN216959329U (en) | 2022-01-12 | 2022-01-12 | Railway direct current source double-cascade access system |
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| CN202220069229.0U CN216959329U (en) | 2022-01-12 | 2022-01-12 | Railway direct current source double-cascade access system |
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