阅读说明：本技术 一种电气化铁路多场景自洽能源系统 (Multi-scene self-consistent energy system for electrified railway ) 是由 戴朝华 邓文丽 于 2021-07-07 设计创作，主要内容包括：本发明公开一种电气化铁路多场景自洽能源系统,包括分相牵引供电系统和中央控制器,还包括所内自洽能源系统、所间自洽能源系统和/或区间自洽能源系统；所内自洽能源系统设置在变电所电分相处,所间自洽能源系统设置在分区所电分相处,区间自洽能源系统设置在供电臂上,中央控制器与所内自洽能源系统、所间自洽能源系统、区间自洽能源系统通信连接。本发明能够因地制宜、因网制宜、因荷制宜的选取可再生能源与铁路系统的融合发展形式,利于实现铁路供能的多元绿色化、用能管理的弹性化,同时在不改变原始牵引供电系统结构的前提下,能够有效改善牵引供电系统电能质量并提高系统供电可靠性。(The invention discloses a multi-scene self-consistent energy system of an electrified railway, which comprises a split-phase traction power supply system and a central controller, and further comprises an intra-site self-consistent energy system, an inter-site self-consistent energy system and/or an inter-site self-consistent energy system; the intra-site self-consistent energy system is arranged at the electric phase splitting position of the substation, the inter-site self-consistent energy system is arranged at the electric phase splitting position of the sub-area, the interval self-consistent energy system is arranged on the power supply arm, and the central controller is in communication connection with the intra-site self-consistent energy system, the inter-site self-consistent energy system and the interval self-consistent energy system. The invention can select the fusion development form of renewable energy sources and the railway system according to local conditions, network conditions and load conditions, is beneficial to realizing the diversification and greenness of railway energy supply and the elasticity of energy consumption management, and can effectively improve the electric energy quality of the traction power supply system and improve the power supply reliability of the system on the premise of not changing the structure of the original traction power supply system.)

1. A multi-scene self-consistent energy system of an electrified railway is characterized by comprising a split-phase traction power supply system (1) and a central controller (6), and further comprising an intra-site self-consistent energy system (2), an inter-site self-consistent energy system (4) and/or an inter-zone self-consistent energy system (5), wherein the intra-site self-consistent energy system (2), the inter-site self-consistent energy system (4) and/or the inter-zone self-consistent energy system (5) are arranged independently or in a combined mode;

the utility model discloses a power supply system, including central controller (6), central controller (6) and the interior self-consistent energy system (2) of institute, the setting of self-consistent energy system (2) is in the split phase traction power supply system's (1) traction substation electricity split phase (13) department, self-consistent energy system (4) between the institute sets up in the partition power station electricity split phase (14) department of split phase traction power supply system (1), interval self-consistent energy system (5) set up on power supply arm (15) of split phase traction power supply system (1), central controller (6) and the interior self-consistent energy system (2) of institute, self-consistent energy system (4) between the institute, interval self-consistent energy system (5) communication connection.

2. The electrified railway multi-scene self-consistent energy system according to claim 1, wherein the self-consistent energy system (2) comprises a multi-directional energy routing device I (21), a multi-heterogeneous new energy supply system I (3) and a local control unit I (22); two-phase alternating current transmission ports of the multi-directional energy routing device I (21) are respectively bridged between a power supply arm (15) and a steel rail (16) at a corresponding traction substation electric phase splitting position (13), and a direct current transmission port of the multi-directional energy routing device I (21) is connected with a direct current energy junction line (31) of the multi-heterogeneous new energy supply system I (3); the multi-directional energy routing device I (21) and the multi-heterogeneous new energy supply system I (3) are in communication connection with the local area control unit I (22), and the local area control unit I (22) is in communication connection with the central controller (6).

3. The electrified railway multi-scene self-consistent energy system according to claim 2, characterized in that the structure of the self-consistent energy system (4) comprises a multi-directional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; alternating current transmission ports of the multi-directional energy routing device II are respectively bridged between power supply arms (15) on two sides of an electric phase separation (14) of the subarea and a steel rail (16), and direct current transmission ports of the multi-directional energy routing device II are connected with a direct current energy junction line (31) of the multi-heterogeneous new energy supply system II; and the multidirectional energy routing device II and the heterogeneous new energy supply system II are in communication connection with the local area control unit II, and the local area control unit II is in communication connection with the central controller (6).

4. The electrified railway multi-scene self-consistent energy system according to claim 3, wherein the interval self-consistent energy system (5) comprises a single-phase step-down transformer III (51), a single-phase four-quadrant converter III (52), a direct-current supporting capacitor II (53), a multi-heterogeneous new energy supply system III (54) and a local control unit III (55); the output port of the multi-heterogeneous new energy supply system III (54) is connected with the direct current side of a single-phase four-quadrant converter III (52) through a direct current supporting capacitor II (53), the alternating current side of the single-phase four-quadrant converter III (52) is connected with the secondary side of a single-phase step-down transformer III (51), and the primary side of the single-phase four-quadrant converter III is connected with an independent power supply arm (15); the ring sections are connected with a central controller (6) in a communication mode through a local area control unit III (55).

5. The multi-scenario self-consistent energy system of the electrified railway according to claim 4, wherein the multi-directional energy routing device I (21) and the multi-directional energy routing device II have the same structure and comprise a single-phase step-down transformer I (211), a single-phase step-down transformer II (212) and a back-to-back converter (213); alternating current sides of a single-phase four-quadrant converter I (2131) and a single-phase four-quadrant converter II (2132) in the back-to-back converter (213) are respectively connected with secondary sides of a single-phase step-down transformer I (211) and a single-phase step-down transformer II (212), and direct current sides are connected to two ends of a direct current supporting capacitor I (2133); two-phase alternating current transmission ports are respectively led out from the primary sides of the single-phase step-down transformer I (211) and the single-phase step-down transformer II (212), and direct current transmission ports are led out from the two ends of the direct current supporting capacitor I (2133) and perform multidirectional interaction of energy with the split-phase traction power supply system (1) and the multi-heterogeneous new energy supply system.

6. The electrified railway multi-scene self-consistent energy system according to claim 4, characterized in that the multi-heterogeneous new energy supply system I (3), the multi-heterogeneous new energy supply system II and the multi-heterogeneous new energy supply system III (54) have the same structure, and comprise an existing new energy power generation and supply unit (32), a newly-built new energy power generation and supply unit (34) and/or an energy storage and comprehensive utilization unit (33), and the existing new energy power generation and supply unit (32), the newly-built new energy power generation and supply unit (34) and/or the energy storage and comprehensive utilization unit (33) are independently or in a combined arrangement; the existing new energy power generation and supply unit (32), the new energy power generation and supply unit (34) and the energy storage and comprehensive utilization unit (33) are connected into the direct current energy junction line (31) in parallel.

7. The electrified railway multi-scenario self-consistent energy system according to claim 6, wherein the existing new energy power generation and supply unit (32) comprises an energy supply device (324) which independently utilizes an existing new energy grid-connected power generation system along the line and/or an energy supply device (327) which independently utilizes an existing direct current micro-grid group along the line;

the energy supply device (324) of the existing new energy grid-connected power generation system along the line comprises an existing photovoltaic grid-connected power generation system (3241) along the line, an existing wind power grid-connected power generation system (3242) along the line, an existing hydraulic grid-connected power generation system (3243) along the line and/or other new energy grid-connected power generation systems, the new energy electric energy available along the line is collected to an alternating current lightning protection combiner box (323) as far as possible by arranging an unconsumed electric energy delivery point with the same voltage level between the existing grid-connected power generation system and a three-phase public power grid II (3247), the combined electric energy is reduced by a three-phase step-down transformer (322), and then is rectified into direct current with the required voltage level by a three-phase AC/DC rectifier I (321); the alternating current side of the three-phase AC/DC rectifier I (321) is connected with the secondary side of the three-phase step-down transformer (322), and the direct current side is connected into a direct current energy junction line (31) in parallel to realize energy interaction;

the existing direct-current microgrid group energy supply device (327) along the line comprises a first direct-current microgrid (3271) to an nth direct-current microgrid (3272) which are available along the line, electric energy which is not consumed by the microgrids is converged by a direct-current lightning protection combiner box (326), then is converted into direct current of a required voltage grade by a DC/DC converter I (325), the input side of the DC/DC converter I (325) is connected with the direct-current lightning protection combiner box (326), and the output side of the DC/DC converter I is connected into a direct-current energy junction line (31) in parallel to realize energy interaction.

8. The electrified railway multi-scenario self-consistent energy system according to claim 6, wherein the newly built new energy power generation and supply unit (34) comprises a photovoltaic power generation device (341), a wind power generation device (342), a hydroelectric power generation device (343), a micro gas turbine power generation device (344) and/or other available new energy power generation devices independently or in combination; wherein, the output end of a photovoltaic array (3412) in the photovoltaic power generation device (341) is connected with the input end of a DC/DC converter V (3411); the output end of a wind driven generator (3422) in the wind power generation device (342) is connected with the alternating current end of a three-phase AC/DC converter II (3421); the output end of a hydroelectric generator (3432) in the hydroelectric generation device (343) is connected with the alternating current end of a three-phase AC/DC converter III (3431); the output end of a micro gas turbine (3442) in the micro gas turbine power generation device (344) is connected with the alternating current end of a three-phase AC/DC converter IV; the direct current output ends of all the converters are connected to a direct current energy junction line (31) in parallel.

9. The electrified railway multi-scenario self-consistent energy system according to claim 6, wherein the energy storage and comprehensive utilization unit (33) comprises an energy storage unit (331), a direct current charging pile (3322) device, a hydrogen production device and/or a fuel cell power generation device independently or in combination; the output end of an energy storage device (3312) in the energy storage unit (331) is connected with a bidirectional DC/DC converter (3311); the direct current charging pile (3322) in the direct current charging pile unit (332) is connected with the output end of the DC/DC converter II (3321); an electrolytic cell (3332) in the hydrogen production unit (333) is connected with the output end of a DC/DC converter III (3331); a fuel cell stack (3342) in the fuel cell power generation unit (334) is connected with the input end of a DC/DC converter IV (3341); the direct current input/output ends of all the converters are connected to a direct current energy junction line (31) in parallel to realize energy interaction.

10. The electrified railway multi-scene self-consistent energy system according to claim 1, characterized in that the intra-site self-consistent energy system (2) is formed by connecting a plurality of intra-site self-consistent energy systems (2) in parallel in a modularized manner by adopting a multiple intra-site self-consistent energy system; the inter-site self-consistent energy system (4) adopts a multiple inter-site self-consistent energy system and is formed by connecting a plurality of inter-site self-consistent energy systems (4) in parallel in a modularized manner; the interval self-consistent energy system (5) adopts a multiple interval self-consistent energy system and is formed by connecting a plurality of interval self-consistent energy systems (5) in parallel in a modularization mode.

Technical Field

The invention belongs to the technical field of new energy of electrified railways, and particularly relates to a multi-scene self-consistent energy system of an electrified railway.

Background

As far as 2020, the service life of the electrified railway in China is over 10 kilometers, and the electrified railway is used as a special large industrial user, and is rapidly developed and accompanied with a huge energy consumption problem. According to statistics, the electricity consumption of the national electrified railways reaches 900 hundred million kilowatts in 2020, which is equivalent to consuming 110.7 million kilograms of standard coal every year and discharging about 897.3 million kilograms of carbon dioxide, 27 million kilograms of sulfur dioxide and 13.5 million kilograms of nitrogen oxides, wherein the traction energy part accounts for more than 60 percent of the total energy consumption of the railways. How to realize the energy conservation and emission reduction of the railway system draws wide attention of all social circles, and especially, new development requirements of greenization, high efficiency and high elasticity are put forward for the railway system. Therefore, research on the fusion development form of renewable energy sources and railway systems is the trend of the current state, especially in the traction field with higher energy consumption ratio.

Due to the natural intersection of the energy network and the traffic network in geographic space, the railway is often accompanied by abundant renewable energy sources, such as abundant hydraulic resources along the southwest, photovoltaic resources in the western region, wind resources in the southeast coastal regions, and the like. The railway has a large amount of land resources for development and utilization and a wide electric energy consumption space, so that an effective way is provided for the energy regeneration of the railway assets. However, due to the particularity of the application environment, the following problems still need to be focused in the research process: (1) for the railway renewable energy application form, on one hand, a new energy power generation system can be newly built based on the railway owned land resources to be accessed; on the other hand, the existing new energy grid-connected power generation system or the micro-grid group along the line can be directly accessed, so that the investment cost of the railway new energy system is reduced while the electric energy consumption rate of the existing system is increased. Therefore, it is necessary to explore how to develop and construct a new energy system of the railway according to local conditions and ensure the self-consistent (self-sufficient) diversified development of the railway energy supply. (2) The existing electrified railway traction power supply system mostly adopts split-phase power supply system, and the particularity forces the sections of the traction network to form a linear power supply island, so that how to access a new energy system due to network system needs to be discussed, and the energy routing of a specific section is realized and the power supply reliability of the system is improved through flexible interconnection of global/local circuits. (3) Traction load is different from conventional electric load, and besides the problems of generating electric energy quality such as idle work, negative sequence, harmonic wave, network voltage fluctuation and the like, megawatt-level regenerative braking energy can be generated in the braking process, and if the megawatt-level regenerative braking energy is not recycled, the megawatt-level regenerative braking energy is greatly wasted. Therefore, on the premise of realizing effective access of the new energy system, it is necessary to discuss how to improve the power supply quality and energy efficiency of the traction power supply system due to the condition of load.

In the prior art, the scheme of accessing new energy to the traction power supply system of the electrified railway is based on the access of a new system, and the existing new energy system along the line is fused in consideration of few factors and local conditions, namely, the construction cost of the system is reduced while the wind and light abandonment and water abandonment are reduced; secondly, in the existing technical scheme, the access points of the new energy system are located in a traction substation, and for a traction network with wide area span and segmented power supply characteristics, the zoning station and an independent power supply interval are important optional access points, especially for realizing multi-station energy routing and power fusion; in addition, aiming at unconsumed new energy electric energy and regenerative braking energy, the existing scheme mostly adopts single-station energy storage to directly store or feed back to the power distribution network, and the energy utilization form can also be used for adaptive selection by integrating different application scenes, such as multi-station cooperative energy utilization, external charging piles, electricity-gas conversion and the like.

Disclosure of Invention

In order to solve the problems, the invention provides a multi-scene self-consistent energy system of an electrified railway, which can select a fusion development form of renewable energy sources and a railway system according to local conditions, network conditions and load conditions, is beneficial to realizing the diversification and greening of railway energy supply and the elasticity of energy utilization management, and can effectively improve the electric energy quality of a traction power supply system and improve the power supply reliability of the system on the premise of not changing the structure of an original traction power supply system.

In order to achieve the purpose, the invention adopts the technical scheme that: a multi-scene self-consistent energy system of an electrified railway comprises a split-phase traction power supply system and a central controller, and further comprises an intra-site self-consistent energy system, an inter-site self-consistent energy system and/or an inter-section self-consistent energy system, wherein the intra-site self-consistent energy system, the inter-site self-consistent energy system and/or the inter-section self-consistent energy system are arranged independently or in a combined mode;

the inter-station self-consistent energy system is arranged at a traction substation electric phase splitting part of a phase splitting traction power supply system, the inter-station self-consistent energy system is arranged at a subarea station electric phase splitting part of the phase splitting traction power supply system, the interval self-consistent energy system is arranged on a power supply arm of the phase splitting traction power supply system, and the central controller is in communication connection with the inter-station self-consistent energy system, the inter-station self-consistent energy system and the interval self-consistent energy system.

Further, the self-consistent energy system comprises a multidirectional energy routing device I, a multi-heterogeneous new energy supply system I and a local control unit I; two-phase alternating current transmission ports of the multi-directional energy routing device I are respectively bridged between a power supply arm and a steel rail at the corresponding traction substation electric phase splitting position, and a direct current transmission port of the multi-directional energy routing device I is connected with a direct current energy junction line of the multi-heterogeneous new energy supply system I; multidirectional energy routing device I and many heterogeneous new forms of energy supply system I all with I communication connection of local control unit, local control unit I and central controller communication connection.

Further, the self-consistent energy system structure comprises a multidirectional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; the alternating current transmission port of the multi-directional energy routing device II is respectively bridged between the power supply arms on two sides of the electric phase separation position of the subarea and the steel rail, and the direct current transmission port of the multi-directional energy routing device II is connected with the direct current energy junction line of the multi-heterogeneous new energy supply system II; and the multidirectional energy routing device II and the heterogeneous new energy supply system II are in communication connection with the local area control unit II, and the local area control unit II is in communication connection with the central controller.

Further, the interval self-consistent energy system comprises a single-phase step-down transformer III, a single-phase four-quadrant converter III, a direct-current supporting capacitor II, a multi-heterogeneous new energy supply system III and a local control unit III; the output port of the multi-heterogeneous new energy supply system III is connected with the direct current side of a single-phase four-quadrant converter III through a direct current support capacitor II, the alternating current side of the single-phase four-quadrant converter III is connected with the secondary side of a single-phase step-down transformer III, and the primary side of the single-phase four-quadrant converter III is connected to an independent power supply arm; the ring sections are in communication connection with the central controller through a local area control unit III.

Furthermore, the multi-directional energy routing device I and the multi-directional energy routing device II have the same structure and comprise a single-phase step-down transformer I, a single-phase step-down transformer II and a back-to-back converter; the alternating current sides of the single-phase four-quadrant converter I and the single-phase four-quadrant converter II in the back-to-back converter are respectively connected with the secondary sides of the single-phase step-down transformer I and the single-phase step-down transformer II, and the direct current sides are connected to two ends of a direct current support capacitor I to jointly maintain the stability of direct current bus voltage; two phase alternating current transmission ports are respectively led out from the primary sides of the single-phase step-down transformer I and the single-phase step-down transformer II, and direct current transmission ports are led out from the two ends of the direct current support capacitor I to perform multidirectional interaction of energy with the split-phase traction power supply system and the multi-heterogeneous new energy supply system; the multi-directional energy routing device can guarantee effective energy transmission and simultaneously has the function of realizing comprehensive compensation of electric energy quality at the traction side.

Furthermore, the structure of the multi-heterogeneous new energy supply system I, the structure of the multi-heterogeneous new energy supply system II and the structure of the multi-heterogeneous new energy supply system III are the same, and the multi-heterogeneous new energy supply system I, the multi-heterogeneous new energy supply system II and the multi-heterogeneous new energy supply system III are arranged independently or in a combined mode according to different energy supply scenes, wherein the multi-heterogeneous new energy supply system I comprises an existing new energy power generation and supply unit, a new energy power generation and supply unit and/or an energy storage and comprehensive utilization unit; the existing new energy power generation and supply unit, the newly-built new energy power generation and supply unit and the energy storage and comprehensive utilization unit are connected to the direct-current energy junction line in parallel; the multi-heterogeneous new energy supply system can select the independent or combined energy supply scene according to the actual construction condition of the line and according to local conditions, load conditions and network conditions so as to ensure the comprehensive benefit maximization of the system.

Further, the existing new energy power generation and supply unit comprises an energy supply device which independently utilizes the existing new energy grid-connected power generation system along the line and/or an energy supply device which independently utilizes the existing direct-current micro-grid group along the line;

the existing new energy grid-connected power generation system energy supply device along the line comprises an existing photovoltaic grid-connected power generation system along the line, an existing wind power grid-connected power generation system along the line, an existing hydraulic grid-connected power generation system along the line and/or other new energy grid-connected power generation systems, the new energy electric energy available along the line is collected to an alternating current lightning protection header box as far as possible by arranging an unconsumed electric energy delivery point with the same voltage level between the existing grid-connected power generation system and a three-phase public power grid II, the collected electric energy is reduced in voltage through a three-phase step-down transformer and then rectified into direct current with the required voltage level through a three-phase AC/DC rectifier I; the alternating current side of the three-phase AC/DC rectifier I is connected with the secondary side of the three-phase step-down transformer, and the direct current side is connected with a direct current energy junction line in parallel to realize energy interaction;

the existing direct-current microgrid group energy supply device along the line is independently utilized and comprises a first direct-current microgrid to an nth direct-current microgrid which are available along the line, electric energy which is not consumed by the microgrids is converged by a direct-current lightning protection combiner box, then the electric energy is converted into direct current of a required voltage grade by a DC/DC converter I, the input side of the DC/DC converter I is connected with the direct-current lightning protection combiner box, and the output side of the DC/DC converter I is parallelly connected into a direct-current energy junction line to realize energy interaction.

Furthermore, a multi-heterogeneous energy system is independently or combined to build by integrating the renewable energy distribution situation and the construction conditions along the line, and the newly-built new energy power generation and supply unit independently or combined comprises a photovoltaic power generation device, a wind power generation device, a hydroelectric power generation device, a micro gas turbine power generation device and/or other available new energy power generation devices; the output end of a photovoltaic array in the photovoltaic power generation device is connected with the V input end of the DC/DC converter; the output end of a wind driven generator in the wind power generation device is connected with the alternating current end of a three-phase AC/DC converter II; the output end of a hydroelectric generator in the hydroelectric generation device is connected with the alternating current end of a three-phase AC/DC converter III; the output end of a micro gas turbine in the micro gas turbine power generation device is connected with the AC end of a three-phase AC/DC converter IV; the direct current output ends of the converters are parallelly connected to the direct current energy junction lines to realize energy interaction, and the inside of each converter independently realizes the functions of alternating current/direct current electric energy conversion, maximum power point tracking and the like.

Further, the energy storage and comprehensive utilization unit independently or in a combined mode comprises an energy storage unit, a direct current charging pile device, a hydrogen production device and/or a fuel cell power generation device; the output end of an energy storage device in the energy storage unit is connected with the bidirectional DC/DC converter; the direct current charging pile in the direct current charging pile unit is connected with the output end of the DC/DC converter II; the electrolytic cell in the hydrogen production unit is connected with the output end of the DC/DC converter III; a fuel cell stack in the fuel cell power generation unit is connected with the input end of a DC/DC converter IV; the direct current input/output ends of the converters are connected to the direct current energy junction lines in parallel to realize energy interaction;

on one hand, when new energy electric energy which cannot be completely absorbed or regenerative braking electric energy which is not transferred and utilized exists in the system, the link can directly store redundant electric energy in the energy storage unit, or the redundant electric energy is used for charging a vehicle-mounted emergency power supply with energy consumption on a train or charging electric vehicles coming to and going to a station through the direct current charging pile unit, or the redundant electric energy is converted into hydrogen through the hydrogen production unit, so that fuel can be supplied to the fuel cell power generation unit, and the redundant hydrogen can also be supplied to a nearby local load for use; on the other hand, when the electric energy required by the traction side cannot be completely met, the energy storage unit and the fuel cell power generation unit can supplement electric energy in time so as to ensure the balance of supply and demand of the energy of the whole system.

Further, the intra-site self-consistent energy system adopts a multiple intra-site self-consistent energy system and is formed by modularly connecting a plurality of intra-site self-consistent energy systems in parallel; the inter-site self-consistent energy system adopts a multiple inter-site self-consistent energy system and is formed by modularly connecting a plurality of inter-site self-consistent energy systems in parallel; the interval self-consistent energy system adopts a multiple interval self-consistent energy system and is formed by modularly connecting a plurality of interval self-consistent energy systems in parallel; so as to achieve the operation purposes of system capacity expansion, fault tolerance and the like.

The beneficial effects of the technical scheme are as follows:

according to the invention, different new energy supply forms can be selected according to local conditions, and a direct energy supply form can be adopted for a built new energy grid-connected power generation system or a micro-grid group along the line, so that the electric energy consumption rate of the existing system can be improved (wind and light are abandoned, water is abandoned) and the investment cost of a railway new energy system is reduced; for a line without an existing new energy system, the distribution situation and construction conditions of renewable energy along the line can be integrated, and an energy supply form of a newly-built new energy power generation system is adopted; such forms of application are advantageous to ensure economic sustainability of energy supply scenarios.

The coupling scheme of the new energy power generation system and the traction power supply system can be selected according to network conditions, and comprises an intra-site self-consistent energy system coupling scheme, an inter-site self-consistent energy system coupling scheme and an inter-zone self-consistent energy system coupling scheme, and each scheme can independently realize low-carbon greening of energy supply; the multiple coupling positions can better adapt to the span of the existing traction network wide area and the segmented power supply characteristic, and the selectivity of the actual application scene is increased; meanwhile, the combined power supply scheme can also realize flexible interconnection of global/local lines on the basis of the benefits, is beneficial to energy routing and power fusion of a specific section, and can further improve energy utilization efficiency and power supply reliability of the system especially for situations without electric energy consumption and emergency power supply.

The invention can improve the power supply quality and energy utilization flexibility of the traction power supply system due to the condition of load, and particularly, on one hand, the back-to-back structure adopted in the inter/inter self-consistent energy system can ensure the effective transmission of energy and simultaneously realize the comprehensive compensation function of the electric energy quality at the traction side; although the comprehensive effect of the electric energy quality of a single-phase inversion structure adopted in the interval self-consistent energy system is not as good as that of the single-phase inversion structure adopted in the interval self-consistent energy system, the technical maturity is higher, the construction cost is lower, and various balance spaces are provided for users; on the other hand, the three schemes are provided with energy storage and comprehensive utilization links, so that the high-efficiency utilization of new energy electric energy and regenerative braking energy can be realized, and the maximization of comprehensive benefits is favorably realized.

Drawings

Fig. 1 is a schematic view of a topological structure of a multi-scenario self-consistent energy system of an electrified railway.

Fig. 2 is a schematic structural diagram of a multidirectional energy routing apparatus according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a multi-heterogeneous new energy supply system according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a topology of a multiple intra/inter-site self-consistent energy system according to an embodiment of the present invention.

Fig. 5 is a schematic view of a topology of a multiple interval self-consistent energy system according to an embodiment of the present invention.

In the figure: 1-split-phase traction power supply system, 2-intra-site self-consistent energy system, 3-multi-heterogeneous new energy supply system I, 4-inter-site self-consistent energy system, 5-interval self-consistent energy system, 6-central controller;

11-three-phase public power grid I, 12-traction substation, 13-substation electric phase splitting, 14-subarea substation electric phase splitting, 15-power supply arm, 16-steel rail, 17-vehicle emergency power supply and 18-train;

21-multidirectional energy routing device I, 22-local control unit I;

211-a single-phase step-down transformer I, 212-a single-phase step-down transformer II, 213-a back-to-back converter, 2131-a single-phase four-quadrant converter I, 2132-a single-phase four-quadrant converter II, 2133-a direct-current supporting capacitor I;

31-a direct current energy junction line, 32-an existing new energy power generation and supply unit, 33-an energy storage and comprehensive utilization unit, and 34-a new energy power generation and supply unit;

321-a three-phase AC/DC rectifier I, 322-a three-phase step-down transformer, 323-an alternating current lightning protection combiner box, 324-an energy supply device of an existing new energy grid-connected power generation system along the line, 3241-an existing photovoltaic grid-connected power generation system along the line, 3242-an existing wind power grid-connected power generation system along the line, 3243-an existing hydraulic grid-connected power generation system along the line, 3244/3245/3246-an unconsumed electric energy delivery point and 3247-a three-phase public power grid II;

325-DC/DC converter I, 326-DC lightning protection combiner box, 327-independently utilizing the existing DC microgrid group energy supply device along the line, 3271-a first DC microgrid, 3272-an nth DC microgrid;

331-an energy storage unit, 3311-a bidirectional DC/DC converter, 3312-an energy storage device, 332-a direct current charging pile unit, 3321-a DC/DC converter II, 3322-a direct current charging pile, 333-a hydrogen production unit, 3331-a DC/DC converter III, 3332-an electrolytic cell, 334-a fuel cell power generation unit, 3341-a DC/DC converter IV and 3342-a fuel cell stack;

341-photovoltaic power generation device, 3411-DC/DC converter V, 3412-photovoltaic array, 342-wind power generation device, 3421-three-phase AC/DC converter II, 3422-wind power generator, 343-hydroelectric power generation device, 3431-three-phase AC/DC converter III, 3432-hydroelectric power generator, 344-micro gas turbine power generation device, 3441-three-phase AC/DC converter IV, 3442-micro gas turbine;

51-single-phase step-down transformer III, 52-single-phase four-quadrant converter III, 53-direct current support capacitor II, 54-multi-heterogeneous new energy supply system III, 55-local control unit III.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.

In this embodiment, referring to fig. 1, a multi-scenario self-consistent energy system for an electrified railway includes a split-phase traction power supply system 1 and a central controller 6, and further includes an intra-site self-consistent energy system 2, an inter-site self-consistent energy system 4 and/or an inter-zone self-consistent energy system 5, and the intra-site self-consistent energy system 2, the inter-site self-consistent energy system 4 and/or the inter-zone self-consistent energy system 5 are independently or combinatively arranged;

the intra-station self-consistent energy system 2 is arranged at a traction substation electric phase separation 13 of the phase separation traction power supply system 1, the inter-station self-consistent energy system 4 is arranged at a subarea station electric phase separation 14 of the phase separation traction power supply system 1, the interval self-consistent energy system 5 is arranged on a power supply arm 15 of the phase separation traction power supply system 1, and the central controller 6 is in communication connection with the intra-station self-consistent energy system 2, the inter-station self-consistent energy system 4 and the interval self-consistent energy system 5.

As an optimization scheme of the embodiment, the self-consistent energy system 2 comprises a multidirectional energy routing device I21, a heterogeneous new energy supply system I3 and a local control unit I22; two-phase alternating current transmission ports of the multi-directional energy routing device I21 are respectively bridged between a power supply arm 15 and a steel rail 16 at the corresponding traction substation electric phase separation 13, and a direct current transmission port of the multi-directional energy routing device I21 is connected with a direct current energy junction line 31 of the multi-heterogeneous new energy supply system I3; the multi-directional energy routing device I21 and the multi-heterogeneous new energy supply system I3 are in communication connection with the local area control unit I22, and the local area control unit I22 is in communication connection with the central controller 6.

The structure of the self-consistent energy system 4 comprises a multidirectional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; the alternating current transmission port of the multi-directional energy routing device II is respectively bridged between the power supply arms 15 on two sides of the electric phase section 14 of the subarea and the steel rail 16, and the direct current transmission port of the multi-directional energy routing device II is connected with the direct current energy junction line 31 of the multi-heterogeneous new energy supply system II; and the multidirectional energy routing device II and the heterogeneous new energy supply system II are in communication connection with a local area control unit II, and the local area control unit II is in communication connection with the central controller 6.

The interval self-consistent energy system 5 comprises a single-phase step-down transformer III 51, a single-phase four-quadrant converter III 52, a direct-current supporting capacitor II 53, a multi-heterogeneous new energy supply system III 54 and a local control unit III 55; the output port of the multi-heterogeneous new energy supply system III 54 is connected with the direct current side of a single-phase four-quadrant converter III 52 through a direct current support capacitor II 53, the alternating current side of the single-phase four-quadrant converter III 52 is connected with the secondary side of a single-phase step-down transformer III 51, and the primary side of the single-phase four-quadrant converter III is connected to an independent power supply arm 15; the ring sections are connected with the central controller 6 in a communication mode through a local area control unit III 55.

As an optimization scheme of the above embodiment, as shown in fig. 2, the multi-directional energy routing device i 21 and the multi-directional energy routing device ii have the same structure, and include a single-phase step-down transformer i 211, a single-phase step-down transformer ii 212, and a back-to-back converter 213; the alternating current sides of a single-phase four-quadrant converter I2131 and a single-phase four-quadrant converter II 2132 in the back-to-back converter 213 are respectively connected with the secondary sides of a single-phase step-down transformer I211 and a single-phase step-down transformer II 212, and the direct current sides are connected to the two ends of a direct current support capacitor I2133 to jointly maintain the stability of direct current bus voltage; two phase alternating current transmission ports are respectively led out from the primary sides of the single-phase step-down transformer I211 and the single-phase step-down transformer II 212, and direct current transmission ports are led out from the two ends of the direct current supporting capacitor I2133 and perform multidirectional interaction of energy with the split-phase traction power supply system 1 and the multi-heterogeneous new energy supply system; the multi-directional energy routing device can guarantee effective energy transmission and simultaneously has the function of realizing comprehensive compensation of electric energy quality at the traction side.

As an optimization scheme of the above embodiment, as shown in fig. 3, the multiple heterogeneous new energy supply system i 3, the multiple heterogeneous new energy supply system ii and the multiple heterogeneous new energy supply system iii 54 have the same structure, and include, according to different energy supply scenarios, an existing new energy power generation and supply unit 32, a new energy power generation and supply unit 34 and/or an energy storage and comprehensive utilization unit 33, and the existing new energy power generation and supply unit 32, the new energy power generation and supply unit 34 and/or the energy storage and comprehensive utilization unit 33 are independently or in combination; the existing new energy power generation and supply unit 32, the newly-built new energy power generation and supply unit 34 and the energy storage and comprehensive utilization unit 33 are connected to the direct-current energy junction line 31 in parallel; the multi-heterogeneous new energy supply system can select the independent or combined energy supply scene according to the actual construction condition of the line and according to local conditions, load conditions and network conditions so as to ensure the comprehensive benefit maximization of the system.

The existing new energy power generation and supply unit 32 comprises an existing new energy grid-connected power generation system power supply device 324 which is independently used along the line and/or an existing direct-current microgrid group power supply device 327 which is independently used along the line;

the energy supply device 324 of the existing new energy grid-connected power generation system along the line comprises an existing photovoltaic grid-connected power generation system 3241 along the line, an existing wind grid-connected power generation system 3242 along the line, an existing hydraulic grid-connected power generation system 3243 along the line and/or other new energy grid-connected power generation systems along the line, an unconsumed electric energy delivery point 3244/3245/3246 with the same voltage level is arranged between the existing grid-connected power generation system and a three-phase public power grid II 3247, the new energy electric energy available along the line is collected to an alternating current lightning protection header box 323 as far as possible, the collected electric energy is reduced in voltage through a three-phase step-down transformer 322 and then rectified into direct current with the required voltage level through a three-phase AC/DC rectifier I321; the alternating current side of the three-phase AC/DC rectifier I321 is connected with the secondary side of the three-phase step-down transformer 322, and the direct current side is connected to the direct current energy junction line 31 in parallel to realize energy interaction;

the existing direct-current microgrid group energy supply device 327 along the line independently comprises a first direct-current microgrid 3271 to an nth direct-current microgrid 3272 which are available along the line, electric energy which is not consumed by the microgrid is converged by a direct-current lightning protection combiner box 326 and then converted into direct current of a required voltage grade by a DC/DC converter I325, the input side of the DC/DC converter I325 is connected with the direct-current lightning protection combiner box 326, and the output side is connected with a direct-current energy junction line 31 in parallel to realize energy interaction.

The newly-built new energy power generation and supply unit 34 independently or in combination comprises a photovoltaic power generation device 341, a wind power generation device 342, a hydroelectric power generation device 343, a micro gas turbine power generation device 344 and/or other available new energy power generation devices; the output end of a photovoltaic array 3412 in the photovoltaic power generation device 341 is connected with the input end of a DC/DC converter V3411; the output end of a wind driven generator 3422 in the wind power generation device 342 is connected with the alternating current end of a three-phase AC/DC converter II 3421; the output end of a hydroelectric generator 3432 in the hydroelectric generation device 343 is connected with the alternating current end of a three-phase AC/DC converter III 3431; the output end of a micro gas turbine 3442 in the micro gas turbine power generation device 344 is connected with the alternating current end of a three-phase AC/DC converter IV; the direct current output ends of the converters are parallelly connected to the direct current energy junction line 31 to realize energy interaction, and the inside of each converter independently realizes the functions of alternating current/direct current electric energy conversion, maximum power point tracking and the like.

The energy storage and comprehensive utilization unit 33 independently or in combination comprises an energy storage unit 331, a direct current charging pile 3322 device, a hydrogen production device and/or a fuel cell power generation device; the output end of the energy storage device 3312 in the energy storage unit 331 is connected to the bidirectional DC/DC converter 3311; the direct current charging pile 3322 in the direct current charging pile unit 332 is connected with the output end of the DC/DC converter II 3321; an electrolytic bath 3332 in the hydrogen production unit 333 is connected with the output end of a DC/DC converter III 3331; the fuel cell stack 3342 in the fuel cell power generation unit 334 is connected with the input end of a DC/DC converter IV 3341; the direct current input/output ends of the converters are connected to the direct current energy junction line 31 in parallel to realize energy interaction;

on one hand, when new energy electric energy which cannot be completely absorbed or regenerative braking electric energy which is not transferred and utilized exists in the system, the energy storage and comprehensive utilization unit 33 can directly store redundant electric energy in the energy storage unit 331, or charge the redundant electric energy for a vehicle-mounted emergency power supply with energy consumption on a train or charge electric vehicles coming to and going to a station through the direct current charging pile unit 332, or convert the redundant electric energy into hydrogen through the hydrogen production unit 333, and not only can supply fuel for the fuel cell power generation unit 334, but also can supply the redundant hydrogen for the use of an adjacent local load; on the other hand, when the power demand of the traction side cannot be fully met, the energy storage unit 331 and the fuel cell power generation unit 334 perform timely power supply and demand compensation to ensure the balance of the power supply and demand of the whole system.

As an optimization scheme of the above embodiment, the intra-site self-consistent energy system 2 may be a single structure, and a plurality of intra-site self-consistent energy systems 2 may be connected in parallel in a modularized manner to form a multiple intra-site self-consistent energy system, as shown in fig. 4; the inter-site self-consistent energy system 4 adopts a single structure, and a plurality of inter-site self-consistent energy systems 4 can be connected in parallel in a modularized manner to form a multi-site self-consistent energy system, as shown in fig. 4; the interval self-consistent energy system 5 adopts a single structure, and can modularly connect a plurality of interval self-consistent energy systems 5 in parallel to form a multiple interval self-consistent energy system, as shown in fig. 5, so as to achieve the operation purposes of system capacity expansion, fault tolerance and the like.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. 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 invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.