CN216959333U - Railway energy routing system powered by renewable energy micro-grid - Google Patents
Railway energy routing system powered by renewable energy micro-grid Download PDFInfo
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- CN216959333U CN216959333U CN202220069132.XU CN202220069132U CN216959333U CN 216959333 U CN216959333 U CN 216959333U CN 202220069132 U CN202220069132 U CN 202220069132U CN 216959333 U CN216959333 U CN 216959333U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a railway energy routing system powered by a renewable energy micro-grid, which comprises: the system comprises a plurality of routing subsystems, a direct-current micro-grid and a multi-winding transformer, wherein the direct-current side of each routing subsystem is connected with the direct-current micro-grid; the alternating current side of each routing subsystem is connected to a multi-winding transformer and is connected to the traction network through the multi-winding transformer. The utility model can improve the power quality problem of the traction power supply system; the series railway energy router structure can improve the power supply reliability of a traction power supply system, enlarge the system capacity, improve the fault-tolerant capability of the system and reduce the withstand pressure of power electronic devices in the subsystem; and the fault emergency capacity and flexibility of the system are enhanced.
Description
Technical Field
The utility model belongs to the technical field of electrified railways, and particularly relates to a railway energy routing system powered by a renewable energy micro-grid.
Background
With the rapid development of rail transit, the railway electrification ratio is higher and higher, and the regenerative braking energy generated by the train is more and more. When the vehicle is braked or descends a slope at a constant speed, energy flows from the motor to the traction network, and if the feedback energy is not completely absorbed, the pressure of the traction network is possibly increased to cause the protection of a traction system. Meanwhile, when the power grid along the railway is weak and the power supply is difficult, the energy problem becomes the primary reason restricting the railway development. The solar energy and wind energy resources in China are rich, and the solar energy and wind energy resources have the characteristic of inexhaustibility and are the fastest-developing energy sources in the current renewable energy sources. However, photovoltaic power generation and wind power generation are greatly influenced by the environment, have strong volatility, and can bring threats to the running stability of a railway system when being directly connected to a traction power supply system. In addition, in the running process of the high-altitude mountain train, when power supply faults occur due to various reasons, if the train stops in the tunnel, the rescue difficulty is greatly increased, and the time for waiting for rescue is difficult to control.
The prior art proposes a novel power supply mode that integrates a photovoltaic power generation system and an energy storage system through the dc side of a back-to-back converter device. The system can effectively improve the electric energy quality of a traction power supply system such as idle work, negative sequence, harmonic wave and the like, simultaneously takes the photovoltaic electric energy and the wind power electric energy into consideration, and recovers regenerative braking energy.
However, the current research mainly focuses on a centralized photovoltaic energy storage back-to-back converter system, which does not have local fault tolerance, and if a local element in an external device is abnormal or fails, the whole device needs to be switched out of an operating state; in addition, the existing system has large capacity and has severe requirements on the rated capacity, the tolerance level and the like of power electronic devices in the system. 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 energy routing system powered by a renewable energy micro-grid, which can improve the problem of electric energy quality of a traction power supply system; the series railway energy router structure can improve the power supply reliability of a traction power supply system, enlarge the system capacity, improve the fault-tolerant capability of the system and reduce the withstand pressure of power electronic devices in the subsystem; and the fault emergency capability and flexibility of the system are enhanced.
In order to realize the purpose, the utility model adopts the technical scheme that: a renewable energy micro-grid powered railway energy routing system comprises: the system comprises a plurality of routing subsystems, a direct-current micro-grid and a multi-winding transformer, wherein the direct-current side of each routing subsystem is connected with the direct-current micro-grid; the alternating current side of each routing subsystem is connected to a multi-winding transformer and is connected to the traction network through the multi-winding transformer.
Further, the routing subsystem comprises a back-to-back converter, and the direct current side of the back-to-back converter is connected with the direct current microgrid; alternating current two sides of the back-to-back converter are respectively connected to the secondary side of the first multi-winding transformer and the secondary side of the second multi-winding transformer and are respectively connected to the traction network through the first multi-winding transformer and the second multi-winding transformer.
Further, the first multi-winding transformer is an alpha-phase multi-winding transformer, and the second multi-winding transformer is a beta-phase multi-winding transformer; two sides of back-to-back converters of the multiple routing subsystems are respectively connected to the secondary side of the alpha-phase multi-winding transformer and the secondary side of the beta-phase multi-winding transformer, and the two sides of the back-to-back converters are respectively connected with an alpha power supply arm, a beta power supply arm and a steel rail in the traction network through the alpha-phase multi-winding transformer and the beta-phase multi-winding transformer.
Furthermore, the routing subsystem further comprises a first control switch and a second control switch, and two alternating current sides of the back-to-back converter are respectively connected with the first control switch and the second control switch; a first control switch) is connected to the first multi-winding transformer secondary, and a second control switch is connected to the beta-phase multi-winding transformer secondary. The fault-tolerant capability of the system can be effectively improved, and when a local fault occurs, the control switches on the two sides can be disconnected, so that the fault is removed, and the continuous operation of the system can still be ensured. The control switch can adopt various controllable switches such as an isolation protection switch, a control switch and the like.
Further, the back-to-back converter comprises a first four-quadrant converter, a second four-quadrant converter and a common direct current capacitor; the direct current sides of the first four-quadrant converter and the second four-quadrant converter are connected to a common direct current capacitor in parallel.
Further, the direct-current microgrid comprises a direct-current bus and a renewable energy power supply system, the renewable energy power supply system is connected to the direct-current bus, and the direct-current side of each routing subsystem is connected with the direct-current bus.
Furthermore, the renewable energy power generation system comprises a photovoltaic system and/or a wind power system, and electric energy output by the photovoltaic system and/or the wind power system is communicated to the direct current bus.
Further, the renewable energy power supply system further comprises an energy storage system, and the energy storage system is connected with the direct current bus.
Further, the energy storage system comprises a bidirectional energy converter and an energy storage device, or only comprises the energy storage device;
the photovoltaic system comprises a photovoltaic array and a DC/DC converter;
the wind power system comprises a fan system and an AC/DC rectifier, or the fan system directly outputs direct current power.
The system further comprises a central control system, and the central control system is in information interaction with the traction network and the routing subsystems through a communication channel.
The beneficial effects of the technical scheme are as follows:
the routing subsystem of the utility model adopts a modularized series structure, can timely remove the running state under the condition that the sub-module has local fault, does not influence the running of the whole system, effectively improves the power supply reliability of the traction system and improves the fault-tolerant capability of the system.
The system provided by the utility model adopts a modularized string structure, so that the capacity borne by each sub-module is reduced, and the requirements on the performance of power electronic devices of the system under a high-voltage high-capacity environment can be reduced; the number of the sub-modules needing to be grouped into strings can be freely organized according to the capacity requirement of an application scene, and therefore the system utilization rate is improved.
The system provided by the utility model provides energy circulation channels for the power supply arms on two sides and channels for accessing the direct-current micro-grid, so that the electric energy of the traction power supply system is improved; meanwhile, the electric quantity generated by the direct-current micro-grid is absorbed, and the energy generated by the regenerative braking of the train is effectively recovered.
Drawings
Fig. 1 is a schematic structural diagram of a railway energy routing system powered by a renewable energy microgrid according to the present invention;
FIG. 2 is a schematic structural diagram of a routing subsystem according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dc microgrid according to an embodiment of the present invention;
wherein 1 is a traction network, 11 is an alpha power supply arm, 12 is a beta power supply arm, 13 is a steel rail, 21 is a routing subsystem, 22 is a first multi-winding transformer, 23 is a second multi-winding transformer, 211 is a first four-quadrant converter, 212 is a second four-quadrant converter, 213 is a common direct-current capacitor, 214 is a first control switch, and 215 is a second control switch; 3 is a direct current microgrid, 31 is a direct current bus, 32 is an energy storage system, 33 is a photovoltaic system, 34 is a wind power system, 322 is a photovoltaic array, 331 is a DC/DC converter, and 4 is a central control system.
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, the traction network 1 includes an α -phase power supply arm 11, a β -phase power supply arm 12, a steel rail 13, and a traction load; the α -phase power supply arm 11 and the β -phase power supply arm 12 form a loop with the rail 13, and a traction load is connected between the α/β -phase power supply arm 11/12 and the rail 13.
A railway energy routing system powered by renewable energy microgrid, as shown in fig. 1, comprising: the system comprises a plurality of routing subsystems 21, a direct-current microgrid 3 and a multi-winding transformer, wherein the direct-current side of each routing subsystem 21 is connected with the direct-current microgrid 3; the ac side of each routing subsystem 21 is connected to a multi-winding transformer, via which it is connected to the traction network 1.
As an optimization scheme of the above embodiment, as shown in fig. 2, the routing subsystem 21 includes a back-to-back converter, and a dc side of the back-to-back converter is connected to the dc microgrid 3; alternating current two sides of the back-to-back converter are respectively connected to the secondary side of the first multi-winding transformer 22 and the secondary side of the second multi-winding transformer 23, and are respectively connected to the traction network 1 through the first multi-winding transformer 22 and the second multi-winding transformer 23.
Preferably, the first multi-winding transformer 22 may adopt an α -phase multi-winding transformer, and the second multi-winding transformer 23 may adopt a β -phase multi-winding transformer; two sides of back-to-back converters of the multiple routing subsystems 21 are respectively connected to the secondary side of the alpha-phase multi-winding transformer and the secondary side of the beta-phase multi-winding transformer, and are respectively connected with the alpha power supply arm 11, the beta power supply arm 12 and the steel rail 13 in the traction network 1 through the alpha-phase multi-winding transformer and the beta-phase multi-winding transformer.
Preferably, the back-to-back converter is a four-quadrant converter, and comprises a first four-quadrant converter 211, a second four-quadrant converter 212 and a common direct current capacitor 213; the dc sides of the first 211 and second 212 quadrant converters are connected in parallel to a common dc capacitor 213.
As an optimized solution of the above embodiment, the routing subsystem 21 further includes a first control switch 214 and a second control switch 215, and two ac sides of the back-to-back converter are respectively connected to the first control switch 214 and the second control switch 215; a first control switch 214 is connected to the secondary side of the first multi-winding transformer 22 and a second control switch 215 is connected to the secondary side of the beta-phase multi-winding transformer 23. The fault-tolerant capability of the system can be effectively improved, and when a local fault occurs, the control switches on the two sides can be disconnected, so that the fault is removed, and the continuous operation of the system can still be ensured. The control switch can adopt various controllable switches such as an isolation protection switch, a control switch and the like.
As an optimized solution of the above embodiment, as shown in fig. 3, the dc microgrid 3 includes a dc bus 31 and a renewable energy power supply system, the renewable energy power supply system is connected to the dc bus 31, and the dc side of each routing subsystem 21 is connected to the dc bus 31.
The renewable energy power generation system may include a photovoltaic system 33 and/or a wind power system 34, and the photovoltaic system 33 and/or the wind power system 34 outputs electrical energy to the dc bus 31. The renewable energy power supply system can further comprise an energy storage system 32, and the energy storage system 32 is connected with the direct current bus 31.
The direct current microgrid 3 comprises, but is not limited to, a direct current bus 31, an optional energy storage system 32, an optional photovoltaic system 33, an optional wind power system 34, and/or other power sources or loads; one side of the direct current bus 31 is connected to the direct current side of the group-string type back-to-back converter system, and the other side is connected in parallel to an optional energy storage system 32, an optional photovoltaic system 33, an optional wind power system 34 and/or other power sources or loads.
The energy storage system 32 includes a bidirectional energy converter and an energy storage device, or only an energy storage device; 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.
The photovoltaic system 33 includes a photovoltaic array 332 and a DC/DC converter 331.
The wind power system 34 includes a fan system and an AC/DC rectifier, or a fan system directly outputting direct current power.
As an optimization scheme of the above embodiment, as shown in fig. 1, the railway energy routing system powered by the renewable energy microgrid further includes a central control system 4, and the central control system 4 performs information interaction with the traction network 1 and the plurality of routing subsystems 21 through a communication channel.
The central control system 4 can detect voltage/current data of the two power supply arms, voltage/current/temperature data of the photovoltaic system, wind speed/voltage/current data of the wind power system and real-time charge state/voltage/current/temperature data of the energy storage system in real time; the central centralized control system 4 calculates traction load power, photovoltaic output power and wind power system output power, and selects an operation mode according to a calculation result; the central centralized control system 4 distributes power and/or current to the group-string back-to-back converter system, the renewable energy source and the energy storage system according to different modes, so as to realize system coordination control.
For a better understanding of the present invention, the following is a complete description of the working principle of the present invention:
active power transfer is realized by controlling the single-phase back-to-back converter, and reactive power and harmonic compensation is realized by controlling the single-phase back-to-back converter to dynamically output corresponding reactive power and harmonic current. The routing subsystem adopts a modularized series structure, can timely remove the running state under the condition that the sub-module has local fault, does not influence the running of the whole system, effectively improves the power supply reliability of the traction system, and improves the fault-tolerant capability of the system. The system adopts a modularized serial structure, so that the capacity borne by each sub-module is reduced, and the requirements on the performance of power electronic devices of the system under a high-voltage high-capacity environment can be reduced; the number of the sub-modules needing to be grouped into strings can be freely organized according to the capacity requirement of an application scene, and therefore the system utilization rate is improved. The system provides energy circulation channels for the power supply arms on the two sides and channels connected into the direct-current microgrid, and improves the electric energy of the traction power supply system; meanwhile, the electric quantity generated by the direct-current micro-grid is absorbed, and the energy generated by the regenerative braking of the train is effectively recovered.
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. A railway energy routing system powered by renewable energy micro-grid is characterized by comprising: the system comprises a plurality of routing subsystems (21), a direct-current microgrid (3) and a multi-winding transformer, wherein the direct-current side of each routing subsystem (21) is connected with the direct-current microgrid (3); the AC side of each routing subsystem (21) is connected to a multi-winding transformer, and is connected to the traction network (1) through the multi-winding transformer.
2. The renewable energy microgrid-powered railway energy routing system according to claim 1, characterized in that the routing subsystem (21) comprises back-to-back converters, the direct current sides of which are connected with the direct current microgrid (3); alternating current two sides of the back-to-back converter are respectively connected to the secondary side of the first multi-winding transformer (22) and the secondary side of the second multi-winding transformer (23), and are respectively connected to the traction network (1) through the first multi-winding transformer (22) and the second multi-winding transformer (23).
3. The renewable energy microgrid-powered railroad energy routing system of claim 2, characterized in that the first multi-winding transformer (22) is an alpha-phase multi-winding transformer, and the second multi-winding transformer (23) is a beta-phase multi-winding transformer; two sides of back-to-back converters of the routing subsystems (21) are respectively connected to the secondary side of the alpha-phase multi-winding transformer and the secondary side of the beta-phase multi-winding transformer, and the two sides are respectively connected with an alpha power supply arm (11), a beta power supply arm (12) and a steel rail (13) in the traction network (1) through the alpha-phase multi-winding transformer and the beta-phase multi-winding transformer.
4. The renewable energy microgrid-powered railway energy routing system of claim 2, characterized in that the routing subsystem (21) further comprises a first control switch (214) and a second control switch (215), and two alternating current sides of the back-to-back converter are respectively connected with the first control switch (214) and the second control switch (215); a first control switch (214) is connected to the secondary side of the first multi-winding transformer (22) and a second control switch (215) is connected to the secondary side of the beta-phase multi-winding transformer (23).
5. The renewable energy microgrid-powered railroad energy routing system of claim 2, characterized in that the back-to-back converters comprise a first four-quadrant converter (211), a second four-quadrant converter (212) and a common dc capacitor (213); the direct current sides of the first four-quadrant converter (211) and the second four-quadrant converter (212) are connected to a common direct current capacitor (213) in parallel.
6. A renewable energy microgrid powered railway energy routing system according to any one of claims 1 to 5, characterized in that the direct current microgrid (3) comprises a direct current bus (31) and a renewable energy power supply system, the renewable energy power supply system is connected to the direct current bus (31), and the direct current side of each routing subsystem (21) is connected with the direct current bus (31).
7. The renewable energy microgrid-powered railway energy routing system according to claim 6, characterized in that the renewable energy power generation system comprises a photovoltaic system (33) and/or a wind power system (34), and the photovoltaic system (33) and/or the wind power system (34) outputs electric energy to the direct current bus (31).
8. The renewable energy microgrid-powered railway energy routing system according to claim 7, characterized in that the renewable energy power supply system further comprises an energy storage system (32), and the energy storage system (32) is connected with a direct current bus (31).
9. A renewable energy microgrid-powered railroad energy routing system according to claim 8, characterized in that the energy storage system (32) comprises a bidirectional energy converter and an energy storage device, or only an energy storage device;
the photovoltaic system (33) comprises a photovoltaic array (332) and a DC/DC converter (331);
the wind power system (34) comprises a fan system and an AC/DC rectifier, or a fan system directly outputting direct current power.
10. The renewable energy microgrid-powered railway energy routing system according to claim 1, characterized by further comprising a central control system (4), wherein the central control system (4) performs information interaction with the traction network (1) and the plurality of routing subsystems (21) through communication channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220069132.XU CN216959333U (en) | 2022-01-12 | 2022-01-12 | Railway energy routing system powered by renewable energy micro-grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220069132.XU CN216959333U (en) | 2022-01-12 | 2022-01-12 | Railway energy routing system powered by renewable energy micro-grid |
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| CN216959333U true CN216959333U (en) | 2022-07-12 |
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| CN202220069132.XU Active CN216959333U (en) | 2022-01-12 | 2022-01-12 | Railway energy routing system powered by renewable energy micro-grid |
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- 2022-01-12 CN CN202220069132.XU patent/CN216959333U/en active Active
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