CN216672604U - Cascade parallel railway energy routing system - Google Patents

Cascade parallel railway energy routing system Download PDF

Info

Publication number
CN216672604U
CN216672604U CN202220069296.2U CN202220069296U CN216672604U CN 216672604 U CN216672604 U CN 216672604U CN 202220069296 U CN202220069296 U CN 202220069296U CN 216672604 U CN216672604 U CN 216672604U
Authority
CN
China
Prior art keywords
converter
beta
alpha
iii
parallel
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.)
Active
Application number
CN202220069296.2U
Other languages
Chinese (zh)
Inventor
戴朝华
廉静如
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.)
Southwest Jiaotong University
Original Assignee
Southwest Jiaotong University
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 Southwest Jiaotong University filed Critical Southwest Jiaotong University
Priority to CN202220069296.2U priority Critical patent/CN216672604U/en
Application granted granted Critical
Publication of CN216672604U publication Critical patent/CN216672604U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units

Landscapes

  • Rectifiers (AREA)

Abstract

The utility model discloses a cascade parallel railway energy routing system which comprises a cascade parallel railway energy router formed by connecting a plurality of cascade railway energy routing modules in parallel, wherein the cascade parallel railway energy router is bridged on a traction network. The utility model can save the use of a power frequency step-down transformer, effectively reduce the system cost and improve the system efficiency; the fault-tolerant capability is realized, and the normal operation of the system can be ensured even if the system suffers external disturbance or local fault; the modular device helps to alleviate the tolerance requirements on the internal power electronics in high voltage, high capacity environments.

Description

Cascade parallel railway energy routing system
Technical Field
The utility model belongs to the technical field of electrified railways, and particularly relates to a cascade parallel railway energy routing system.
Background
Currently, the world energy is in tension day by day, energy conservation and consumption reduction become worldwide research subjects, and in the field of rail transit, the utilization rate of regenerative braking energy generated by train braking is low; meanwhile, the phenomenon of wind and light abandonment in various places is frequent, and the problem of energy consumption becomes a technical bottleneck restricting the development of the wind and light abandonment. Therefore, the railway energy router which can recover the regenerative braking energy, can consume the renewable energy and can effectively improve the electric energy quality problems of negative sequence, idle work, harmonic wave and the like of the traction network attracts attention.
However, the current research mainly focuses on a centralized topological structure, and the topological structure is connected to a traction network through a power frequency step-down transformer, so that the system cost is increased and the efficiency is low; meanwhile, the topological structure does not have local fault tolerance capability, and if a local element in the external equipment is abnormal or fails, the whole equipment needs to be switched out of a running 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 cascade parallel railway energy routing system which can save the use of a power frequency step-down transformer, effectively reduce the system cost and improve the system efficiency; the system has fault-tolerant capability, and can ensure the normal operation of the system even if the system suffers external disturbance or local fault; the modular device helps to alleviate the tolerance requirements for the internal power electronics in high voltage, high capacity environments.
In order to realize the purpose, the utility model adopts the technical scheme that: a cascade parallel railway energy routing system comprises a cascade parallel railway energy router, wherein the cascade parallel railway energy router comprises a plurality of cascade railway energy routing modules which are connected in parallel, and the cascade parallel railway energy router is bridged on a traction network.
Furthermore, the cascade parallel railway energy router is bridged among an alpha power supply arm, a beta power supply arm and a steel rail of a traction substation or a zoning station, and the cascade parallel railway energy router module adopts a stepped converter cascade topological structure and comprises an alpha side cascade converter subsystem, a beta side cascade converter subsystem, a main common capacitor and a direct current source; the alpha side cascade converter subsystem and the beta side cascade converter subsystem are connected to a main public capacitor in parallel, and direct current sources are connected to the alpha side cascade converter subsystem and the beta side cascade converter subsystem;
the alternating current side of the alpha-side cascade converter subsystem is connected between an alpha power supply arm and a steel rail; and the alternating current side of the beta-side cascade converter subsystem is connected between the beta power supply arm and the steel rail.
Furthermore, the alpha side cascade converter subsystem and the beta side cascade converter subsystem have the same structure and comprise a plurality of DC/AC converter modules which are cascaded;
the DC/AC converter module comprises a DC/AC converter I and a bypass control switch, wherein the AC side of the DC/AC converter I is connected with the bypass control switch I in parallel, and the DC side of the DC/AC converter I is connected with a sub-common capacitor and a DC source in parallel; the bypass control switches I of the DC/AC converters I are connected in series and then are respectively connected to the power supply arm and the steel rail;
the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem are connected with the direct current side I of the DC/AC converter connected with the steel rail, and the direct current sides of the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem share a main common capacitor and a direct current source which are connected in parallel.
Furthermore, the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem have the same structure and comprise a DC/AC converter module and a plurality of DC/DC converter modules which are cascaded;
the DC/AC converter module comprises a DC/AC converter II and a first sub-common capacitor, wherein the DC side of the DC/AC converter II is connected with the first sub-common capacitor and a DC source in parallel and is cascaded with the lower-level DC/DC converter module; the alternating current side of the DC/AC converter II is connected to the power supply arm and the steel rail;
the DC/DC converter module comprises a DC/DC converter, a bypass control switch II and a second sub-common capacitor, and the DC/DC converter is connected with the bypass control switch II in parallel; a high-voltage direct-current side of the DC/DC converter is cascaded with an upper module; the low-voltage direct current side of the DC/DC converter is connected with a second sub-common capacitor and a direct current source in parallel and is cascaded with a lower-level DC/DC converter;
in the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem, the last-stage DC/DC converter far away from the DC/AC converter II is connected together and shares a second sub-common capacitor and a direct current source.
Furthermore, the cascade railway energy routing module adopts a tower-type converter cascade topological structure, comprises a plurality of back-to-back converter subsystems which are cascaded and is bridged among an alpha power supply arm, a beta power supply arm and a steel rail of a traction substation or a subarea substation.
Further, the back-to-back converter subsystem comprises a plurality of back-to-back DC/AC converter subsystems III, and the plurality of back-to-back DC/AC converter subsystems III are formed by cascading; the alternating current side of the top-level back-to-back DC/AC converter subsystem is connected with the alpha power supply arm and the beta power supply arm, and the alternating current side of the bottom-level back-to-back DC/AC converter subsystem is connected with a steel rail.
Furthermore, the back-to-back DC/AC converter subsystem III comprises an alpha-side DC/AC converter III, a beta-side DC/AC converter III and a public capacitor, and the direct current sides of the alpha-side DC/AC converter III and the beta-side DC/AC converter III are connected in parallel to the public capacitor to form a back-to-back structure;
the alternating current side of the alpha side DC/AC converter III is connected with an alpha side bypass control switch III in parallel, the alternating current side of the beta side DC/AC converter III is connected with a beta side bypass control switch III in parallel, and a direct current source is connected into a common capacitor in parallel;
the alternating current side of an alpha-side DC/AC converter III of a top-level back-to-back DC/AC converter subsystem III is connected with an alpha power supply arm and the alternating current side of a lower-level alpha-side DC/AC converter III, and the alternating current side of a beta-side DC/AC converter III of the top-level back-to-back DC/AC converter subsystem III is connected with a beta power supply arm and the alternating current side of a lower-level beta-side DC/AC converter III;
the alternating current side of an alpha-side DC/AC converter III of a middle-level back-to-back DC/AC converter subsystem III is respectively connected with the alternating current sides of an upper-level alpha-side DC/AC converter III and a lower-level alpha-side DC/AC converter III, and the alternating current side of a beta-side DC/AC converter III of the middle-level back-to-back DC/AC converter subsystem III is respectively connected with the alternating current sides of the upper-level beta-side DC/AC converter III and the lower-level beta-side DC/AC converter III;
and the alternating current side of the alpha-side DC/AC converter III of the bottom-level back-to-back DC/AC converter subsystem III is respectively connected with the alternating current side of the alpha-side DC/AC converter III of the upper level and a steel rail, and the alternating current side of the beta-side DC/AC converter III of the bottom-level back-to-back DC/AC converter subsystem III is respectively connected with the alternating current side of the beta-side DC/AC converter III of the upper level and the steel rail.
Further, the back-to-back converter subsystem comprises a back-to-back DC/AC converter subsystem IV and a plurality of back-to-back DC/DC converter subsystems which are cascaded;
the alternating current side of the back-to-back DC/AC converter subsystem IV is connected between the alpha power supply arm, the beta power supply arm and the steel rail; the direct current side of the back-to-back DC/AC converter subsystem IV is connected with the high voltage side of the top-level back-to-back DC/DC converter subsystem; and the high-voltage side of each of the other back-to-back DC/DC converter subsystems is cascaded with the upper-level back-to-back DC/DC converter subsystem, and the low-voltage side is cascaded with the lower-level back-to-back DC/DC converter subsystem.
Further, the back-to-back DC/AC converter subsystem IV comprises an alpha-side DC/AC converter, a beta-side DC/AC converter and a first common capacitor, wherein the direct current sides of the alpha-side DC/AC converter and the beta-side DC/AC converter are connected in parallel to the first common capacitor to form a back-to-back structure; the direct current source is connected in parallel to the first common capacitor;
the back-to-back DC/DC converter subsystem comprises an alpha-side DC/DC converter, a beta-side DC/DC converter and a second common capacitor, wherein the direct current sides of the alpha-side DC/DC converter and the beta-side DC/DC converter are connected in parallel to the second common capacitor to form a back-to-back structure; the alpha-side DC/DC converter is connected with an alpha-side bypass control switch IV in parallel, the beta-side DC/DC converter is connected with a beta-side bypass control switch IV in parallel, and a direct current source is connected into a second common capacitor in parallel.
Further, the cascade railway energy routing module also comprises a central controller for detecting data of the alpha power supply arm and the beta power supply arm and data of a direct current source in real time; and the central controller controls each control switch and/or converter to realize system coordination control.
The beneficial effects of the technical scheme are as follows:
the system provided by the utility model adopts a parallel-cascade topological structure, so that a power frequency step-down transformer can be omitted, the expensive manufacturing cost of the transformer is saved, and the system cost is reduced; meanwhile, the loss of the power frequency step-down transformer accounts for a large proportion, generally 0.5% of rated capacity, so that the operation efficiency of the system is improved.
The utility model adopts a parallel-cascade topological structure, and can utilize the bypass switch connected in parallel with each converter submodule, when a certain submodule fails, the local failure can be timely removed, and the continuous operation of the system is ensured. The system has fault-tolerant capability, and can also ensure the normal operation of the system even if the system suffers external disturbance or local fault.
The voltage and the capacity born by each submodule of the system are smaller compared with a centralized structure, so that the requirements on the performance of the power electronic devices of the system under a high-voltage large-capacity environment can be reduced.
Drawings
FIG. 1 is a schematic diagram of a cascaded parallel railway energy routing system according to the present invention;
fig. 2 is a schematic diagram of a cascade topology structure of a stepped converter in the embodiment of the present invention;
fig. 3 is a schematic diagram of another cascaded topology of a stepped converter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a cascade topology structure of a pagoda-shaped converter in the embodiment of the present invention;
fig. 5 is a schematic diagram of a cascade topology of another pagoda-type converter in the embodiment of the present invention;
FIG. 6 is a schematic diagram of a topology of a DC source according to an embodiment of the present invention;
the system comprises a power supply unit, a power supply unit and a control unit, wherein 1 is an alpha power supply arm, 2 is a cascade parallel railway energy router, 3 is a beta power supply arm, 4 is a steel rail (4), 5 is a main public capacitor, and 6 is a direct current source; 211 is a DC/AC converter I, 212 is a sub-common capacitor, 213 is a bypass control switch I; 221 is a DC/AC converter II, 222 is a first sub-common capacitor, 223 is a DC/DC converter, 224 is a bypass control switch II, and 225 is a second sub-common capacitor; 231 is a back-to-back DC/AC converter subsystem iii, 2311 is an alpha-side DC/AC converter iii, 2312 is a beta-side DC/AC converter iii, 2313 is an alpha-side bypass control switch iii, 2314 is a beta-side bypass control switch iii, 2315 is a common capacitor; 241 is a back-to-back DC/AC converter subsystem iv, 242 is a back-to-back DC/DC converter subsystem, 2411 is an alpha-side DC/AC converter, 2412 is a beta-side DC/AC converter, 2413 is a first common capacitor, 2421 is an alpha-side DC/DC converter, 2422 is a beta-side DC/DC converter, 2423 is an alpha-side bypass control switch iv, 2424 is a beta-side bypass control switch iv, and 2425 is a second common capacitor.
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 cascade parallel type railway energy routing system includes a cascade parallel type railway energy router 2, where the cascade parallel type railway energy router 2 includes a plurality of cascade type railway energy routing modules connected in parallel, and the cascade parallel type railway energy router 2 is connected across a traction network.
The cascade railway energy router module can have, but is not limited to, 4 topologies: a ladder type DC/AC cascade topology, a ladder type DC/DC cascade topology, a pagoda type DC/AC cascade topology, and a pagoda type DC/DC cascade topology.
As an optimization scheme 1 of the above embodiment, the cascade parallel railway energy router 2 is bridged between an α power supply arm 1, a β power supply arm 3 and a steel rail 4 of a traction substation or a zoning station, and the cascade railway energy router module adopts a step-type converter cascade topology structure, and includes an α -side cascade converter subsystem, a β -side cascade converter subsystem, a main common capacitor 5 and a dc source 6; the alpha side cascade converter subsystem and the beta side cascade converter subsystem are connected to a main public capacitor 5 in parallel, and the alpha side cascade converter subsystem and the beta side cascade converter subsystem are both connected with a direct current source 6;
the alternating current side of the alpha-side cascade converter subsystem is connected between an alpha power supply arm 1 and a steel rail 4; the alternating current side of the beta-side cascade converter subsystem is connected between a beta power supply arm 3 and a steel rail 4.
As an optimization scheme 1.1 of the above embodiment, as shown in fig. 2, the α -side cascade converter subsystem and the β -side cascade converter subsystem have the same structure and include a plurality of DC/AC converter modules cascaded together; the DC/AC converter module comprises a DC/AC converter 211 and a bypass control switch, wherein the AC side of the DC/AC converter 211 is connected with the bypass control switch I213 in parallel, and the DC side of the DC/AC converter I211 is connected with a common capacitor 212 and a DC source 6 in parallel; the bypass control switches I213 of the DC/AC converters I221 are connected in series and then are respectively connected to the power supply arm and the steel rail 4;
the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem are connected with the direct current side of a DC/AC converter I211 connected with a steel rail 4, and the direct current sides of the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem share a main common capacitor 5 and a direct current source 6 which are connected in parallel.
Preferably, the stepped DC/AC cascade topology further includes an α -side cascade converter subsystem and a β -side cascade converter subsystem; the direct current side of the two-stage converter subsystem is connected in parallel to a common capacitor to form a back-to-back structure, the alternating current alpha side is connected between the alpha power supply arm 1 and the steel rail 5, and the alternating current beta side is connected between the beta power supply arm 3 and the steel rail 5; the alpha-side and beta-side cascaded converter subsystems are formed by cascading a plurality of (assumed to be n) DC/AC converter modules; the DC/AC converter module is formed by connecting a DC/AC four-quadrant converter AC side in parallel with a bypass control switch I213, a DC side in parallel with a common capacitor 212 and a DC source 6; the central controller 7 is configured to detect voltage/current data of the α power supply arm 1 and the β power supply arm 3, voltage/current/temperature data of a photovoltaic system in the 2n-1 direct current sources, wind speed/voltage/current data of a wind power system, and real-time charge state/voltage/current/temperature data of an energy storage system in real time; the central controller 7 calculates traction load power, photovoltaic output total power and wind power system output total power, and selects an operation mode according to a calculation result; the central controller 7 distributes power and/or current for the 2n control switches, the 2n DC/AC converters, the 2n-1 renewable energy systems and the energy storage system according to different modes, and system coordination control is achieved.
As an optimization scheme 1.2 of the above embodiment, as shown in fig. 3, the α -side cascade converter subsystem and the β -side cascade converter subsystem have the same structure, and include one DC/AC converter module and a plurality of DC/DC converter modules cascaded together; the DC/AC converter module comprises a DC/AC converter II 221 and a first sub-common capacitor 222, wherein the DC side of the DC/AC converter II 221 is connected with the first sub-common capacitor 222 and a DC source 6 in parallel and is formed by cascading with the lower-level DC/DC converter module; the alternating current side of the DC/AC converter II 221 is connected to the power supply arm and the steel rail 4; the DC/DC converter module comprises a DC/DC converter 223, a bypass control switch II 224 and a second sub-common capacitor 225, wherein the DC/DC converter 223 is connected with the bypass control switch II 224 in parallel; a DC/DC converter 223 is connected with the upper module in a cascade mode at the high-voltage direct-current side; the low-voltage direct current side of the DC/DC converter 223 is connected with the second sub-common capacitor 225 and the direct current source 6 in parallel and is formed by cascading with the lower-level DC/DC converter;
in the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem, the last-stage DC/DC converter far away from the DC/AC converter II 221 is connected together, and shares a second sub-common capacitor 225 and the direct current source 6.
Preferably, the stepped DC/DC cascade topology further includes that the α -side cascade converter subsystem and the β -side cascade converter subsystem are connected in parallel to the common capacitor to form a back-to-back structure, the alternating current α -side is connected between the α -supply arm 1 and the steel rail 5, and the alternating current β -side is connected between the β -supply arm 3 and the steel rail 5; the alpha-side and beta-side cascade converter subsystems are formed by cascading a DC/AC converter module and a plurality of (assumed to be n) DC/DC converter modules; the DC/AC converter module is formed by connecting a first sub-common capacitor 222 and a direct current source 6 in parallel on the direct current side of a DC/AC four-quadrant converter II and cascading the DC/AC converter module with a lower-level DC/DC converter; the DC/DC converter module is formed by connecting a DC/DC converter 223 in parallel with a bypass control switch II 224, cascading an upper module at a high-voltage direct-current side, connecting a second sub-common capacitor 225 and a direct-current source 6 at a low-voltage direct-current side in parallel, and cascading with a lower DC/DC converter; the central controller 7 is configured to detect voltage/current data of the α power supply arm 1 and the β power supply arm 3, voltage/current/temperature data of a photovoltaic system in the 2n +1 direct current sources, wind speed/voltage/current data of a wind power system, and real-time charge state/voltage/current/temperature data of an energy storage system in real time; the central controller 7 calculates traction load power, photovoltaic output total power and wind power system output total power, and selects an operation mode according to a calculation result; the central controller 7 distributes power and/or current to the 2n control switches, the 2 DC/AC converters, the 2n DC/DC converters, the 2n +1 renewable energy systems and the energy storage system according to different modes, so as to realize system coordination control.
As an optimization scheme 2 of the above embodiment, the cascaded railway energy routing module adopts a pagoda-shaped converter cascade topology structure, and includes a plurality of back-to-back converter subsystems cascaded and bridged between an α power supply arm 1, a β power supply arm 3 and a steel rail 4 of a traction substation or a zoning station.
As an optimization scheme 2.1 of the above embodiment, as shown in fig. 4, the back-to-back converter subsystem includes a plurality of back-to-back DC/AC converter subsystems iii 231, and the plurality of back-to-back DC/AC converter subsystems iii 231 are cascaded; the AC side of the top-level back-to-back DC/AC converter subsystem III 231 is connected with the alpha power supply arm 1 and the beta power supply arm 3, and the AC side of the bottom-level back-to-back DC/AC converter subsystem III 231 is connected with the steel rail 4.
The back-to-back DC/AC converter subsystem III 231 comprises an alpha-side DC/AC converter III 2311, a beta-side DC/AC converter III 2312 and a public capacitor 2315, and the direct current sides of the alpha-side DC/AC converter III 2311 and the beta-side DC/AC converter III 2312 are connected in parallel to the public capacitor 2315 to form a back-to-back structure; the alternating current side of the alpha-side DC/AC converter III 2311 is connected with an alpha-side bypass control switch III 2313 in parallel, the alternating current side of the beta-side DC/AC converter III 2312 is connected with a beta-side bypass control switch III 2314 in parallel, and a direct current source 6 is connected into a common capacitor 2315 in parallel; the control switch can adopt various controllable switches such as an isolation protection switch, a circuit breaker and the like;
the alternating current side of an alpha-side DC/AC converter III 2311 of a top-level back-to-back DC/AC converter subsystem III 231 is connected with the alternating current side of an alpha power supply arm 1 and a lower-level alpha-side DC/AC converter III 2311, and the alternating current side of a beta-side DC/AC converter III 2312 of the top-level back-to-back DC/AC converter subsystem III 231 is connected with the alternating current side of a beta power supply arm 3 and the lower-level beta-side DC/AC converter III 2311; the alternating current side of an alpha-side DC/AC converter III 2311 of a middle-level back-to-back DC/AC converter subsystem III 231 is respectively connected with the alternating current sides of an upper-level alpha-side DC/AC converter III 2311 and a lower-level alpha-side DC/AC converter III 2311, and the alternating current side of a beta-side DC/AC converter III 2312 of the middle-level back-to-back DC/AC converter subsystem III 231 is respectively connected with the alternating current sides of the upper-level beta-side DC/AC converter III 2311 and the lower-level beta-side DC/AC converter III 2311; the alternating current side of an alpha-side DC/AC converter III 2311 of a bottom-level back-to-back DC/AC converter subsystem III 231 is respectively connected with the alternating current side of a higher-level alpha-side DC/AC converter III 2311 and a steel rail 4, and the alternating current side of a beta-side DC/AC converter III 2312 of the bottom-level back-to-back DC/AC converter subsystem III 231 is respectively connected with the alternating current side of a higher-level beta-side DC/AC converter III 2311 and the steel rail 4.
Preferably, the pagoda-shaped DC/AC cascade topology is further formed by cascading a plurality (assumed to be n) of back-to-back converter subsystems III 231; the direct current sides of the alpha-side four-quadrant converter and the beta-side four-quadrant converter of the back-to-back converter subsystem III 231 are connected in parallel to a common capacitor 2315 to form a back-to-back structure, the alternating current alpha side is connected in parallel with an alpha-side bypass control switch III 2313, the alternating current beta side is connected in parallel with a beta-side bypass control switch III 2314, and a direct current source 6 is connected in parallel to the common capacitor 2315; the central controller 7 is configured to detect voltage/current data of the α power supply arm 1 and the β power supply arm 3, voltage/current/temperature data of a photovoltaic system in the n direct current sources, wind speed/voltage/current data of a wind power system, and real-time state of charge/voltage/current/temperature data of an energy storage system in real time; the central controller 7 calculates traction load power, photovoltaic output total power and wind power system output total power, and selects an operation mode according to a calculation result; the central controller 7 distributes power and/or current for the 2n control switches, the n back-to-back converters, the n renewable energy systems and the energy storage system according to different modes, and system coordination control is achieved.
As an optimization scheme 2.2 of the above embodiment, as shown in fig. 5, the back-to-back converter subsystems include a back-to-back DC/AC converter subsystem iv 241 and a plurality of back-to-back DC/DC converter subsystems 242 which are cascaded;
the alternating current side of the back-to-back DC/AC converter subsystem IV 241 is connected between an alpha power supply arm 1, a beta power supply arm 3 and a steel rail 4; the direct current side of the back-to-back DC/AC converter subsystem IV 241 is connected with the high voltage side of the top-level back-to-back DC/DC converter subsystem 242; the high-voltage side of each of the other back-to-back DC/DC converter subsystems 242 is cascaded with the upper-stage back-to-back DC/DC converter subsystem 242, and the low-voltage side is cascaded with the lower-stage back-to-back DC/DC converter subsystem 242.
The back-to-back DC/AC converter subsystem IV 241 comprises an alpha-side DC/AC converter 2411, a beta-side DC/AC converter 2412 and a first public capacitor 2413, wherein the direct current sides of the alpha-side DC/AC converter 2411 and the beta-side DC/AC converter 2412 are connected in parallel to the first public capacitor 2413 to form a back-to-back structure; the dc source 6 is connected in parallel to the first common capacitor 2413.
The back-to-back DC/DC converter subsystem 242 includes an α -side DC/DC converter 2421, a β -side DC/DC converter 2422 and a second common capacitor 2425, wherein the DC sides of the α -side DC/DC converter 2421 and the β -side DC/DC converter 2422 are connected in parallel to the second common capacitor 2425 to form a back-to-back structure; the alpha-side DC/DC converter 2421 is connected with the alpha-side bypass control switch IV 2423 in parallel, the beta-side DC/DC converter 2422 is connected with the beta-side bypass control switch IV 2424 in parallel, and the direct-current source 6 is connected with the second common capacitor 2425 in parallel.
Preferably, the pagoda-shaped DC/DC cascade topology is further formed by cascading 1 back-to-back DC/AC converter subsystem 241 and a plurality (assumed to be n) of back-to-back DC/DC converter subsystems 242; the direct current sides of an alpha-side four-quadrant converter 2411 and a beta-side four-quadrant converter 2412 of the back-to-back DC/AC converter subsystem 241 are connected in parallel to a first common capacitor 2413 to form a back-to-back structure, and a direct current source 6 is connected in parallel to the first common capacitor 2413; the direct current sides of an alpha-side DC/DC converter 2421 and a beta-side DC/DC converter 2422 of the back-to-back DC/DC converter subsystem 242 are connected in parallel to a second common capacitor 2425 to form a back-to-back structure, the alpha-side DC/DC converter is connected in parallel with an alpha-side bypass control switch 2423, the beta-side DC/DC converter is connected in parallel with a beta-side bypass control switch 2424, a direct current source 6 is connected in parallel with the second common capacitor 2425, the high-voltage side of the DC/DC converter is connected with an upper-level subsystem in a cascading mode, and the low-voltage side of the DC/DC converter is connected with a lower-level subsystem in a cascading mode; the central controller 7 is configured to detect voltage/current data of the α power supply arm 1 and the β power supply arm 3, voltage/current/temperature data of a photovoltaic system in the n +1 direct current sources, wind speed/voltage/current data of a wind power system, and real-time charge state/voltage/current/temperature data of an energy storage system in real time; the central controller 7 calculates traction load power, photovoltaic output total power and wind power system output total power, and selects an operation mode according to a calculation result; the central controller 7 distributes power and/or current to the 2n control switches, the 1 back-to-back DC/AC converter, the n back-to-back DC/DC converters, the n +1 renewable energy systems and the energy storage system according to different modes, and system coordination control is achieved.
As a preferable mode of the above embodiment, referring to fig. 6, the dc source 6 includes, but is not limited to, one or more of an optional energy storage system 62, an optional photovoltaic system 63, an optional wind power system 64, and/or other dc power sources, and may even be a dc microgrid.
The energy storage system 62 comprises a bidirectional energy converter and an energy storage device or only an energy storage device; the photovoltaic system 63 comprises a photovoltaic array and a DC/DC converter; the wind power system 64 includes a fan system and an AC/DC rectifier, or a fan system 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.
The foregoing shows and describes the general principles, principal 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 cascade parallel type railway energy routing system is characterized by comprising a cascade parallel type railway energy router (2), wherein the cascade parallel type railway energy router (2) comprises a plurality of cascade type railway energy routing modules which are connected in parallel, and the cascade parallel type railway energy router (2) is bridged on a traction network.
2. The cascade parallel type railway energy routing system of claim 1, wherein the cascade parallel type railway energy router (2) is bridged between 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 the cascade parallel type railway energy routing module adopts a ladder type converter cascade topology structure and comprises an alpha side cascade converter subsystem, a beta side cascade converter subsystem, a main common capacitor (5) and a direct current source (6); the alpha side cascade converter subsystem and the beta side cascade converter subsystem are connected to a main public capacitor (5) in parallel, and the alpha side cascade converter subsystem and the beta side cascade converter subsystem are both connected with a direct current source (6);
the alternating current side of the alpha-side cascade converter subsystem is connected between the alpha power supply arm (1) and the steel rail (4), and the alternating current side of the beta-side cascade converter subsystem is connected between the beta power supply arm (3) and the steel rail (4).
3. The cascaded parallel railway energy routing system of claim 2, wherein the alpha-side cascaded converter subsystem and the beta-side cascaded converter subsystem have the same structure and comprise a plurality of DC/AC converter modules which are cascaded;
the DC/AC converter module comprises a DC/AC converter I (211) and a bypass control switch I (213), wherein the AC side of the DC/AC converter I (211) is connected with the bypass control switch I (213) in parallel, and the DC side of the DC/AC converter I (211) is connected with a common capacitor (212) and a DC source (6) in parallel; bypass control switches I (213) of the DC/AC converters I (211) are connected in series and then are respectively connected to a power supply arm and a steel rail (4);
the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem are connected with the direct current side of a DC/AC converter I (211) connected with a steel rail (4), and the direct current sides of the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem share a main common capacitor (5) and a direct current source (6) which are connected in parallel.
4. The cascaded parallel railway energy routing system of claim 2, wherein the alpha-side cascaded converter subsystem and the beta-side cascaded converter subsystem have the same structure and comprise a DC/AC converter module and a plurality of DC/DC converter modules which are cascaded;
the DC/AC converter module comprises a DC/AC converter II (221) and a first sub-common capacitor (222), the direct current side of the DC/AC converter II (221) is connected with the first sub-common capacitor (222) and a direct current source (6) in parallel, and the DC/AC converter module is formed by cascading with a lower-level DC/DC converter module; the alternating current side of the DC/AC converter II (221) is connected to the power supply arm and the steel rail (4);
the DC/DC converter module comprises a DC/DC converter (223), a bypass control switch II (224) and a second sub-common capacitor (225), wherein the DC/DC converter (223) is connected with the bypass control switch II (224) in parallel; a DC/DC converter (223) is connected with the upper module in a cascade mode at the high-voltage direct current side; the low-voltage direct current side of the DC/DC converter (223) is connected with a second sub-common capacitor (225) and a direct current source (6) in parallel, and the DC/DC converter is cascaded with a lower-level DC/DC converter;
in the alpha-side cascade converter subsystem and the beta-side cascade converter subsystem, the last DC/DC converter far away from the DC/AC converter II (221) is connected together and shares a second sub-common capacitor (225) and a direct current source (6).
5. The cascade parallel type railway energy routing system of claim 1, wherein the cascade type railway energy routing module adopts a tower-type converter cascade topology structure, comprises a plurality of back-to-back converter subsystems which are cascaded and is bridged among an alpha power supply arm (1), a beta power supply arm (3) and a steel rail (4) of a traction substation or a subarea substation.
6. The cascaded parallel railway energy routing system of claim 5, wherein the back-to-back converter subsystem comprises a plurality of back-to-back DC/AC converter subsystems III (231), and the plurality of back-to-back DC/AC converter subsystems III (231) are cascaded; the alternating current side of the top-level back-to-back DC/AC converter subsystem III (231) is connected with the alpha power supply arm (1) and the beta power supply arm (3), and the alternating current side of the bottom-level back-to-back DC/AC converter subsystem III (231) is connected with the steel rail (4).
7. The cascaded parallel railway energy routing system of claim 6, wherein the back-to-back DC/AC converter subsystem III (231) comprises an alpha-side DC/AC converter III (2311), a beta-side DC/AC converter III (2312) and a common capacitor (2315), and the direct current sides of the alpha-side DC/AC converter III (2311) and the beta-side DC/AC converter III (2312) are connected in parallel to the common capacitor (2315) to form a back-to-back structure;
the alternating current side of the alpha-side DC/AC converter III (2311) is connected with an alpha-side bypass control switch III (2313) in parallel, the alternating current side of the beta-side DC/AC converter III (2312) is connected with a beta-side bypass control switch III (2314) in parallel, and a direct current source (6) is connected into a common capacitor (2315) in parallel;
the alternating current side of an alpha-side DC/AC converter III (2311) of a top-level back-to-back DC/AC converter subsystem III (231) is connected with the alternating current side of an alpha power supply arm (1) and a lower-level alpha-side DC/AC converter III (2311), and the alternating current side of a beta-side DC/AC converter III (2312) of the top-level back-to-back DC/AC converter subsystem III (231) is connected with the alternating current side of a beta power supply arm (3) and the lower-level beta-side DC/AC converter III (2312);
the alternating current side of an alpha-side DC/AC converter III (2311) of a middle-level back-to-back DC/AC converter subsystem III (231) is respectively connected with the alternating current sides of an upper-level alpha-side DC/AC converter III (2311) and a lower-level alpha-side DC/AC converter III (2311), and the alternating current side of a beta-side DC/AC converter III (2312) of the middle-level back-to-back DC/AC converter subsystem III (231) is respectively connected with the alternating current sides of the upper-level beta-side DC/AC converter III (2312) and the lower-level beta-side DC/AC converter III (2312);
the alternating current side of an alpha-side DC/AC converter III (2311) of a bottom-level back-to-back DC/AC converter subsystem III (231) is respectively connected with the alternating current side of an upper-level alpha-side DC/AC converter III (2311) and a steel rail (4), and the alternating current side of a beta-side DC/AC converter III (2312) of the bottom-level back-to-back DC/AC converter subsystem III (231) is respectively connected with the alternating current side of an upper-level beta-side DC/AC converter III (2312) and the steel rail (4).
8. The cascaded parallel railway energy routing system of claim 5, wherein the back-to-back converter subsystem comprises a back-to-back DC/AC converter subsystem IV (241) and a plurality of back-to-back DC/DC converter subsystems (242) cascaded together;
the alternating current side of the back-to-back DC/AC converter subsystem IV (241) is connected among the alpha power supply arm (1), the beta power supply arm (3) and the steel rail (4); the direct current side of the back-to-back DC/AC converter subsystem IV (241) is connected with the high voltage side of the top-level back-to-back DC/DC converter subsystem (242); the high-voltage side of each of the other back-to-back DC/DC converter subsystems (242) is cascaded with the upper-level back-to-back DC/DC converter subsystem (242), and the low-voltage side is cascaded with the lower-level back-to-back DC/DC converter subsystem (242).
9. The cascaded parallel railway energy routing system of claim 8, wherein the back-to-back DC/AC converter subsystem IV (241) comprises an alpha-side DC/AC converter (2411), a beta-side DC/AC converter (2412) and a first common capacitor (2413), and the DC sides of the alpha-side DC/AC converter (2411) and the beta-side DC/AC converter (2412) are connected in parallel to the first common capacitor (2413) to form a back-to-back structure; a direct current source (6) is connected in parallel to a first common capacitor (2413);
the back-to-back DC/DC converter subsystem (242) comprises an alpha-side DC/DC converter (2421), a beta-side DC/DC converter (2422) and a second common capacitor (2425), and the direct current sides of the alpha-side DC/DC converter (2421) and the beta-side DC/DC converter (2422) are connected in parallel to the second common capacitor (2425) to form a back-to-back structure; the alpha-side DC/DC converter (2421) is connected with the alpha-side bypass control switch IV (2423) in parallel, the beta-side DC/DC converter (2422) is connected with the beta-side bypass control switch IV (2424) in parallel, and the direct current source (6) is connected into the second common capacitor (2425) in parallel.
10. A cascaded parallel railway energy routing system according to claim 3, 4, 7 or 9, wherein the cascaded railway energy routing module further comprises a central controller (7) for detecting data of the α power supply arm (1) and the β power supply arm (3) and data of the dc power supply (6) in real time; and the central controller (7) controls each control switch and/or converter to realize system coordination control.
CN202220069296.2U 2022-01-12 2022-01-12 Cascade parallel railway energy routing system Active CN216672604U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220069296.2U CN216672604U (en) 2022-01-12 2022-01-12 Cascade parallel railway energy routing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220069296.2U CN216672604U (en) 2022-01-12 2022-01-12 Cascade parallel railway energy routing system

Publications (1)

Publication Number Publication Date
CN216672604U true CN216672604U (en) 2022-06-03

Family

ID=81761525

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202220069296.2U Active CN216672604U (en) 2022-01-12 2022-01-12 Cascade parallel railway energy routing system

Country Status (1)

Country Link
CN (1) CN216672604U (en)

Similar Documents

Publication Publication Date Title
CN107612051B (en) AC/DC hybrid system based on dual-redundancy power electronic transformer
CN110148939B (en) Household power energy router
CN100483917C (en) Renewable energy feed-back parallel network circuit and its control device
CN213585162U (en) AC/DC power supply structure of data center
CN112886594A (en) AC/DC power supply structure of data center
WO2024001674A1 (en) Photovoltaic storage flexible grid-connected system and method
CN115425691A (en) Multi-voltage-level flexible interconnection device
CN212435428U (en) Uninterruptible power supply
CN107425733A (en) A kind of low-voltage electric energy router topology and control method
CN113890122A (en) Alternating current-direct current multiport power distribution system for office residential area
CN106208396A (en) A kind of distributing hybrid energy-storing based on MMC topology and electric power compensation system
CN2917086Y (en) Renewable energy feedback netting circuit and its control device
CN209200956U (en) A kind of high-power thyristor type traction rectifier braking inversion Bidirectional variable-flow system
CN216672604U (en) Cascade parallel railway energy routing system
CN104917199A (en) AC DC micro grid connection flexible serial parallel multifunctional energy controller
CN204465022U (en) A kind of direct-flow distribution system based on modularization multi-level converter
CN216959346U (en) Alternating current-direct current microgrid router system for comprehensive energy station
CN216215929U (en) Alternating current-direct current multiport power distribution system for office residential area
CN116131325A (en) Solid-state transformer for direct current collection and delivery of remote offshore wind farm
CN204230929U (en) A kind of multi-source coordinated control system
CN113783196A (en) Power supply system of intelligent energy station
CN216959329U (en) Railway direct current source double-cascade access system
CN113078664A (en) Novel data power supply center and uninterrupted power supply method
CN114362164B (en) Cascade parallel railway energy route regulation and control method
CN216959333U (en) Railway energy routing system powered by renewable energy micro-grid

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant