A multi-scenario self-consistent energy system for electrified railways

Abstract

The present invention discloses a multi-scenario self-consistent energy system for electrified railways, including a phase-separated traction power supply system and a central controller, and also including an in-station self-consistent energy system, an inter-station self-consistent energy system and / or a section self-consistent energy system; the in-station self-consistent energy system is arranged at the substation power distribution phase, the inter-station self-consistent energy system is arranged at the substation power distribution phase, the section self-consistent energy system is arranged on the power supply arm, and the central controller is communicatively connected with the in-station self-consistent energy system, the inter-station self-consistent energy system and the section self-consistent energy system. The present invention can select the integrated development form of renewable energy and railway system according to local conditions, grid conditions and load conditions, which is conducive to realizing the diversified greening of railway energy supply and the flexibility of energy management, and at the same time, under the premise of not changing the original traction power supply system structure, it can effectively improve the power quality of the traction power supply system and improve the system power supply reliability.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technologies for electrified railways, and in particular relates to a multi-scenario self-consistent energy system for electrified railways. Background Art

[0002] As of the end of 2020, the operating mileage of electrified railways in my country has exceeded 100,000 kilometers. As a special large-scale industrial user, its rapid development is also accompanied by huge energy consumption problems. According to statistics, the national electrified railway electricity consumption in 2020 alone has reached 90 billion kWh, equivalent to an annual consumption of 11.07 billion kilograms of standard coal, and emissions of about 89.73 billion kilograms of carbon dioxide, 2.7 billion kilograms of sulfur dioxide, and 1.35 billion kilograms of nitrogen oxides, of which traction energy consumption accounts for more than 60% of the total railway energy consumption. How to achieve energy conservation and emission reduction in the railway system has attracted widespread attention from all walks of life, especially the new requirements for the development of green, high-efficiency and high-flexibility of the railway system. Therefore, it is the current national trend to study the integrated development of renewable energy and railway systems, especially in the field of traction where energy consumption accounts for a higher proportion.

[0003] Due to the natural intersection of energy grid and transportation grid in geographical space, railways are often accompanied by abundant renewable energy, such as the southwest, which is rich in hydropower resources, the western region, which is rich in photovoltaic resources, and the southeast coast, which is rich in wind resources. The railway itself not only has a large amount of land resources that can be developed and utilized, but also has a broad space for electricity consumption, which provides an effective way for railway assets to be energy-based. However, due to the particularity of the application environment, the following issues still need to be focused on during the research process: (1) For the application of railway renewable energy, on the one hand, it can be connected to a new energy power generation system based on the railway's own land resources; on the other hand, it can be directly connected to the existing new energy grid-connected power generation system or microgrid group along the line, so as to increase the electricity consumption rate of the existing system while reducing the investment cost of the railway new energy system. Therefore, it is necessary to explore how to develop and build railway new energy systems according to local conditions to ensure the self-consistent (self-sufficient) and diversified development of railway energy supply. (2) Most of the existing electrified railway traction power supply systems adopt a split-phase power supply system. This particularity forces the formation of linear power supply islands between the sections of the traction network. Therefore, it is necessary to explore how to access the new energy system according to the network conditions, and realize the energy routing of specific sections and improve the reliability of system power supply through flexible interconnection of global / local lines. (3) The traction load is different from the conventional power load. In addition to generating power quality problems such as reactive power, negative sequence, harmonics, and grid voltage fluctuations, megawatt-level regenerative braking energy will be generated during the braking process. If it is not recycled, it will cause a huge waste of energy. Therefore, on the premise of realizing the effective access of the new energy system, it is also necessary to explore how to improve the power supply quality and energy efficiency of the traction power supply system according to the load conditions.

[0004] In the existing technology, the solutions for connecting new energy to the electrified railway traction power supply system are all based on the connection of newly built systems, and rarely consider the integration of existing new energy systems along the line according to local conditions, that is, reducing the cost of system construction while reducing the abandonment of wind, solar and water. Secondly, in the existing technical solutions, the access points of new energy systems are mostly located at traction substations. For traction networks with wide regional spans and segmented power supply characteristics, substations and independent power supply sections are also important optional access points, especially for realizing multi-station energy routing and power integration. In addition, for unabsorbed new energy electricity and regenerative braking energy, existing solutions mostly use single-station energy storage to directly store or feed back to the distribution network. The energy utilization form can also be adaptively selected based on different application scenarios, such as multi-station collaborative energy use, external charging piles, and electricity-to-gas conversion. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a multi-scenario self-consistent energy system for electrified railways, which can select the integrated development form of renewable energy and railway systems according to local conditions, grid conditions and load conditions, which is conducive to realizing the diversified greening of railway energy supply and the flexibility of energy management. At the same time, without changing the structure of the original traction power supply system, it can effectively improve the power quality of the traction power supply system and improve the power supply reliability of the system.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an electrified railway multi-scenario self-consistent energy system, including a phase-separated traction power supply system and a central controller, and also including an in-station self-consistent energy system, an inter-station self-consistent energy system and / or a section self-consistent energy system, wherein the in-station self-consistent energy system, the inter-station self-consistent energy system and / or the section self-consistent energy system are independently or combinedly arranged;

[0007] The in-station self-consistent energy system is arranged at the traction substation power distribution phase of the phase-split traction power supply system, the inter-station self-consistent energy system is arranged at the substation power distribution phase of the phase-split traction power supply system, the section self-consistent energy system is arranged on the power supply arm of the phase-split traction power supply system, and the central controller is communicatively connected with the in-station self-consistent energy system, the inter-station self-consistent energy system, and the section self-consistent energy system.

[0008] Furthermore, the self-consistent energy system within the institute includes a multi-directional energy routing device I, a multi-heterogeneous new energy supply system I and a local control unit I; the two-phase AC transmission ports of the multi-directional energy routing device I are respectively bridged between the power supply arm and the rail of the corresponding traction substation power distribution phase, and the DC transmission port of the multi-directional energy routing device I is connected to the DC energy hub line of the multi-heterogeneous new energy supply system I; the multi-directional energy routing device I and the multi-heterogeneous new energy supply system I are both communicatively connected to the local control unit I, and the local control unit I is communicatively connected to the central controller.

[0009] Furthermore, the inter-station self-consistent energy system structure includes a multi-directional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; the AC transmission port of the multi-directional energy routing device II is respectively connected between the power supply arms and the rails on both sides of the sub-station power distribution center, and the DC transmission port of the multi-directional energy routing device II is connected to the DC energy hub line of the multi-heterogeneous new energy supply system II; the multi-directional energy routing device II and the multi-heterogeneous new energy supply system II are both communicatively connected to the local control unit II, and the local control unit II is communicatively connected to the central controller.

[0010] Furthermore, the interval self-consistent energy system includes a single-phase step-down transformer III, a single-phase four-quadrant converter III, a DC support capacitor II, a multi-heterogeneous new energy supply system III and a local control unit III; wherein the output port of the multi-heterogeneous new energy supply system III is connected to the DC side of the single-phase four-quadrant converter III via the DC support capacitor II, the AC side of the single-phase four-quadrant converter III is connected to the secondary side of the single-phase step-down transformer III, and its primary side is connected to an independent power supply arm; each component link is communicated and connected by the local control unit III and the central controller.

[0011] Furthermore, the multi-directional energy routing device I and the multi-directional energy routing device II have the same structure, including a single-phase step-down transformer I, a single-phase step-down transformer II and a back-to-back converter; the AC 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 to the secondary sides of the single-phase step-down transformer I and the single-phase step-down transformer II, and the DC sides are connected to the two ends of the DC support capacitor I, jointly maintaining the stability of the DC bus voltage; the primary sides of the single-phase step-down transformer I and the single-phase step-down transformer II respectively lead out two-phase AC transmission ports, and the two ends of the DC support capacitor I lead out DC transmission ports, which perform multi-directional energy interaction with the split-phase traction power supply system and the multi-heterogeneous new energy supply system; while ensuring the effective transmission of energy, the multi-directional energy routing device can also have the function of realizing the comprehensive compensation of power quality on the traction side.

[0012] Furthermore, the structures of 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 the same, and according to different energy supply scenarios, they include existing new energy power generation and energy supply units, newly built new energy power generation and energy supply units and / or energy storage and comprehensive utilization units. The existing new energy power generation and energy supply units, newly built new energy power generation and energy supply units and / or energy storage and comprehensive utilization units are independently or combinedly arranged; the existing new energy power generation and energy supply units, the newly built new energy power generation and energy supply units, and the energy storage and comprehensive utilization units are connected to the DC energy hub line in parallel; the multi-heterogeneous new energy supply system can select the above-mentioned independent or combined energy supply scenarios according to the actual construction of the line, local conditions, load conditions and grid conditions, so as to ensure that the comprehensive benefits of the system are maximized.

[0013] Furthermore, the existing new energy power generation and energy supply unit includes an energy supply device that independently utilizes an existing new energy grid-connected power generation system along the line and / or an energy supply device that independently utilizes an existing DC microgrid group along the line;

[0014] The energy supply devices of the existing renewable energy grid-connected power generation systems along the route are independent or combined, including existing photovoltaic grid-connected power generation systems, existing wind grid-connected power generation systems, existing hydropower grid-connected power generation systems and / or other renewable energy grid-connected power generation systems. By setting an unabsorbed power transmission point of the same voltage level between the existing grid-connected power generation system and the three-phase public power grid II, the available renewable energy power along the route is collected as much as possible to the AC lightning protection junction box. The collected power is stepped down by a three-phase step-down transformer and then rectified into direct current of the required voltage level by a three-phase AC / DC rectifier I; wherein the AC side of the three-phase AC / DC rectifier I is connected to the secondary side of the three-phase step-down transformer, and the DC side is connected in parallel to the DC energy hub line to realize energy interaction;

[0015] Independently utilize the existing DC microgrid group energy supply devices along the line, including the first DC microgrid to the nth DC microgrid available along the line. The unabsorbed electric energy of the microgrid is merged through the DC lightning protection combiner box, and then converted into DC power of the required voltage level by the DC / DC converter I. The input side of the DC / DC converter I is connected to the DC lightning protection combiner box, and the output side is connected to the DC energy hub line in parallel to realize energy exchange.

[0016] Furthermore, taking into account the distribution of renewable energy sources along the route and the construction conditions, a multi-heterogeneous energy system is constructed independently or in combination, and the newly built new energy power generation and energy supply unit independently or in combination includes photovoltaic power generation devices, wind power generation devices, hydropower generation devices, micro gas turbine power generation devices and / or other available new energy power generation devices; wherein, the output end of the photovoltaic array in the photovoltaic power generation device is connected to the input end of the DC / DC converter V; the output end of the wind generator in the wind power generation device is connected to the AC end of the three-phase AC / DC converter II; the output end of the hydropower generator in the hydropower generation device is connected to the AC end of the three-phase AC / DC converter III; the output end of the micro gas turbine in the micro gas turbine power generation device is connected to the AC end of the three-phase AC / DC converter IV; the DC output end of each converter is connected in parallel to the DC energy hub line to realize energy interaction, and each converter independently realizes functions such as AC / DC power conversion and maximum power point tracking.

[0017] Furthermore, the energy storage and comprehensive utilization unit independently or in combination includes an energy storage unit, a DC charging pile device, a hydrogen production device and / or a fuel cell power generation device; the output end of the energy storage device in the energy storage unit is connected to a bidirectional DC / DC converter; the DC charging pile in the DC charging pile unit is connected to the output end of the DC / DC converter II; the electrolyzer in the hydrogen production unit is connected to the output end of the DC / DC converter III; the fuel cell stack in the fuel cell power generation unit is connected to the input end of the DC / DC converter IV; the DC input / output ends of each converter are connected in parallel to the DC energy hub line to realize energy interaction;

[0018] The energy storage and comprehensive utilization unit serves as an energy transfer station. On the one hand, when there is new energy electric energy that cannot be fully absorbed or regenerative braking electric energy that has not been transferred and utilized in the system, this link can directly store the excess electric energy in the energy storage unit, or use the excess electric energy through the DC charging pile unit to charge the on-board emergency power supply with energy consumption on the train / or charge the electric vehicles traveling to and from the station, or convert the excess electric energy into hydrogen through the hydrogen production unit. In addition to supplying fuel to the fuel cell power generation unit, the excess hydrogen can also be supplied to nearby local loads. On the other hand, when the electric power demand on the traction side cannot be fully met, the energy storage unit and the fuel cell power generation unit will replenish the electric energy in time to ensure the balance of supply and demand of energy for the entire system.

[0019] Furthermore, the in-institute self-consistent energy system adopts a multiple in-institute self-consistent energy system, which is composed of multiple in-institute self-consistent energy systems in modular parallel connection; the inter-institute self-consistent energy system adopts a multiple inter-institute self-consistent energy system, which is composed of multiple inter-institute self-consistent energy systems in modular parallel connection; the interval self-consistent energy system adopts a multiple interval self-consistent energy system, which is composed of multiple interval self-consistent energy systems in modular parallel connection; so as to achieve the operational purposes of system expansion, fault tolerance and so on.

[0020] The beneficial effects of adopting this technical solution are:

[0021] The present invention can select different forms of renewable energy energy supply according to local conditions. For existing renewable energy grid-connected power generation systems or microgrid groups along the line, direct energy supply can be adopted, which can improve the power consumption rate of existing systems (reduce wind, solar and water abandonment) while reducing the investment cost of railway new energy systems. For lines that do not have existing new energy systems, the distribution of renewable energy along the line and construction conditions can be comprehensively considered to adopt the form of newly built renewable energy power generation systems for energy supply. This type of application is conducive to ensuring the economic sustainability of energy supply scenarios.

[0022] The present invention can select the coupling scheme of the new energy power generation system and the traction power supply system according to the network conditions, including the coupling scheme of the self-consistent energy system within the station, the coupling scheme of the self-consistent energy system between stations, and the coupling scheme of the self-consistent energy system between stations. Each scheme can independently realize the low-carbon and green energy supply; multiple coupling positions can better adapt to the wide area span and segmented power supply characteristics of the existing traction network, increasing the selectivity of practical application scenarios; at the same time, the combined power supply scheme can also realize flexible interconnection of global / local lines on the basis of the above benefits, which is beneficial to the energy routing and power integration of specific sections, especially for the unabsorbed electric energy and emergency power supply scenarios, which can further improve the system energy efficiency and power supply reliability.

[0023] The present invention can improve the power supply quality and energy flexibility of the traction power supply system according to the load. Specifically, on the one hand, the back-to-back structure adopted in the self-consistent energy system within / between stations can realize the comprehensive compensation function of the power quality on the traction side while ensuring the effective transmission of energy; although the single-phase inverter structure adopted in the interval self-consistent energy system has an inferior comprehensive power quality effect as the former, it has higher technical maturity and lower construction cost, which also provides users with a variety of trade-off spaces; on the other hand, all three schemes are provided with energy storage and comprehensive utilization links, which can realize the efficient utilization of new energy electricity and regenerative braking energy, and is conducive to maximizing the comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the topological structure of a multi-scenario self-consistent energy system for an electrified railway according to the present invention.

[0025] Figure 2 Schematic diagram of the structure of a multi-directional energy routing device in an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the structure of a multi-heterogeneous new energy supply system in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the topological structure of a multiplexed intra- and inter-institute self-consistent energy system in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the topological structure of a multiple interval self-consistent energy system in an embodiment of the present invention.

[0029] In the figure: 1-phase split traction power supply system, 2-self-consistent energy system within the institute, 3-multi-heterogeneous new energy supply system I, 4-self-consistent energy system between institutes, 5-inter-area self-consistent energy system, 6-central controller;

[0030] 11-three-phase public power grid I, 12-traction substation, 13-substation power phase separation, 14-substation power phase separation, 15-power supply arm, 16-rail, 17-onboard emergency power supply, 18-train;

[0031] 21-Multi-directional energy routing device I, 22-Local control unit I;

[0032] 211-single-phase step-down transformer I, 212-single-phase step-down transformer II, 213-back-to-back converter, 2131-single-phase four-quadrant converter I, 2132-single-phase four-quadrant converter II, 2133-DC support capacitor I;

[0033] 31-DC energy hub line, 32-existing new energy power generation and supply unit, 33-energy storage and comprehensive utilization unit, 34-newly built new energy power generation and supply unit;

[0034] 321-three-phase AC / DC rectifier Ⅰ, 322-three-phase step-down transformer, 323-AC lightning protection junction box, 324-existing new energy grid-connected power generation system energy supply device along the line, 3241-existing photovoltaic grid-connected power generation system along the line, 3242-existing wind grid-connected power generation system along the line, 3243-existing hydropower grid-connected power generation system along the line, 3244 / 3245 / 3246-unabsorbed power transmission point, 3247-three-phase public power grid Ⅱ;

[0035] 325-DC / DC converter I, 326-DC lightning protection combiner box, 327-independent use of existing DC microgrid group energy supply device along the line, 3271-first DC microgrid, 3272-nth DC microgrid;

[0036] 331 - energy storage unit, 3311 - bidirectional DC / DC converter, 3312 - energy storage device, 332 - DC charging pile unit, 3321 - DC / DC converter II, 3322 - DC charging pile, 333 - hydrogen production unit, 3331 - DC / DC converter III, 3332 - electrolyzer, 334 - fuel cell power generation unit, 3341 - DC / DC converter IV, 3342 - fuel cell stack;

[0037] 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 generator, 343 - Hydroelectric power generation device, 3431 - Three-phase AC / DC converter III, 3432 - Hydroelectric generator, 344 - Micro gas turbine power generation device, 3441 - Three-phase AC / DC converter IV, 3442 - Micro gas turbine;

[0038] 51 - single-phase step-down transformer III, 52 - single-phase four-quadrant converter III, 53 - DC support capacitor II, 54 - multi-heterogeneous new energy supply system III, 55 - local control unit III. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described below with reference to the accompanying drawings.

[0040] In this embodiment, see Figure 1 As shown, an electrified railway multi-scenario self-consistent energy system includes a phase-separated traction power supply system 1 and a central controller 6, and also includes an in-station self-consistent energy system 2, an inter-station self-consistent energy system 4 and / or a section self-consistent energy system 5, wherein the in-station self-consistent energy system 2, the inter-station self-consistent energy system 4 and / or the section self-consistent energy system 5 are independently or combinedly arranged;

[0041] The in-station self-consistent energy system 2 is arranged at the traction substation phase 13 of the phase-split traction power supply system 1, the inter-station self-consistent energy system 4 is arranged at the substation phase 14 of the phase-split traction power supply system 1, and the section self-consistent energy system 5 is arranged on the power supply arm 15 of the phase-split traction power supply system 1. The central controller 6 is communicatively connected with the in-station self-consistent energy system 2, the inter-station self-consistent energy system 4, and the section self-consistent energy system 5.

[0042] As an optimization scheme of the above embodiment, the self-consistent energy system 2 within the institute includes a multi-directional energy routing device Ⅰ21, a multi-heterogeneous new energy supply system Ⅰ3 and a local control unit Ⅰ22; the two-phase AC transmission ports of the multi-directional energy routing device Ⅰ21 are respectively bridged between the power supply arm 15 and the rail 16 at the corresponding traction substation electrical phase 13, and the DC transmission port of the multi-directional energy routing device Ⅰ21 is connected to the DC energy hub 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 both communicatively connected to the local control unit Ⅰ22, and the local control unit Ⅰ22 is communicatively connected to the central controller 6.

[0043] The structure of the inter-station self-consistent energy system 4 includes a multi-directional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; the AC transmission port of the multi-directional energy routing device II is respectively connected between the power supply arms 15 and the rails 16 on both sides of the power phase 14 of the sub-station, and the DC transmission port of the multi-directional energy routing device II is connected to the DC energy hub line 31 of the multi-heterogeneous new energy supply system II; the multi-directional energy routing device II and the multi-heterogeneous new energy supply system II are both communicatively connected to the local control unit II, and the local control unit II is communicatively connected to the central controller 6.

[0044] The interval self-consistent energy system 5 includes a single-phase step-down transformer Ⅲ51, a single-phase four-quadrant converter Ⅲ52, a DC support capacitor Ⅱ53, a multi-heterogeneous new energy supply system Ⅲ54 and a local control unit Ⅲ55; wherein, the output port of the multi-heterogeneous new energy supply system Ⅲ54 is connected to the DC side of the single-phase four-quadrant converter Ⅲ52 via the DC support capacitor Ⅱ53, and the AC side of the single-phase four-quadrant converter Ⅲ52 is connected to the secondary side of the single-phase step-down transformer Ⅲ51, and its primary side is connected to an independent power supply arm 15; each component link is connected by the local control unit Ⅲ55 and the central controller 6 for communication.

[0045] As an optimization solution of the above embodiment, Figure 2 As shown, the multi-directional energy routing device I21 has the same structure as the multi-directional energy routing device II, including a single-phase step-down transformer I211, a single-phase step-down transformer II212 and a back-to-back converter 213; the AC sides of the single-phase four-quadrant converter I2131 and the single-phase four-quadrant converter II2132 in the back-to-back converter 213 are respectively connected to the secondary sides of the single-phase step-down transformer I211 and the single-phase step-down transformer II212, and the DC sides are connected to the two ends of the DC support capacitor I2133, so as to jointly maintain the stability of the DC bus voltage; the primary sides of the single-phase step-down transformer I211 and the single-phase step-down transformer II212 respectively lead out two-phase AC transmission ports, and the two ends of the DC support capacitor I2133 lead out DC transmission ports, so as to perform multi-directional energy interaction with the split-phase traction power supply system 1 and the multi-heterogeneous new energy supply system; while ensuring the effective transmission of energy, the multi-directional energy routing device can also realize the comprehensive compensation function of the power quality on the traction side.

[0046] As an optimization solution of the above embodiment, Figure 3 As shown, the structures of the multi-heterogeneous new energy supply system I3, the multi-heterogeneous new energy supply system II and the multi-heterogeneous new energy supply system III54 are the same. According to different energy supply scenarios, they include the existing new energy power generation and energy supply unit 32, the newly built new energy power generation and energy supply unit 34 and / or the energy storage and comprehensive utilization unit 33. The existing new energy power generation and energy supply unit 32, the newly built new energy power generation and energy supply unit 34 and / or the energy storage and comprehensive utilization unit 33 are independently or combinedly arranged; the existing new energy power generation and energy supply unit 32, the newly built new energy power generation and energy supply unit 34 and the energy storage and comprehensive utilization unit 33 are connected to the DC energy hub line 31 in parallel; the multi-heterogeneous new energy supply system can select the above-mentioned independent or combined energy supply scenarios according to the actual construction of the line, local conditions, load conditions and grid conditions, so as to maximize the comprehensive benefits of the system.

[0047] Wherein, the existing new energy power generation and energy supply unit 32 includes an energy supply device 324 independently utilizing an existing new energy grid-connected power generation system along the line and / or an energy supply device 327 independently utilizing an existing DC microgrid group along the line;

[0048] The existing renewable energy grid-connected power generation system energy supply device 324 along the line includes, independently or in combination, the existing photovoltaic grid-connected power generation system 3241, the existing wind grid-connected power generation system 3242, the existing hydropower grid-connected power generation system 3243 and / or other renewable energy grid-connected power generation systems along the line. By setting the unconsumed power transmission point 3244 / 3245 / 3246 of the same voltage level between the existing grid-connected power generation system and the three-phase public power grid II 3247, the available renewable energy power along the line is collected as much as possible to the AC lightning protection junction box 323. The collected power is stepped down by the three-phase step-down transformer 322, and then rectified into direct current of the required voltage level by the three-phase AC / DC rectifier I 321; wherein, the AC side of the three-phase AC / DC rectifier I 321 is connected to the secondary side of the three-phase step-down transformer 322, and the DC side is connected in parallel to the DC energy hub line 31 to realize energy interaction;

[0049] The existing DC microgrid group energy supply device 327 along the line is independently utilized, including the first DC microgrid 3271 to the nth DC microgrid 3272 available along the line. The electric energy not consumed by the microgrid is merged through the DC lightning protection junction box 326, and then converted into DC power of the required voltage level by the DC / DC converter I 325. The input side of the DC / DC converter I 325 is connected to the DC lightning protection junction box 326, and the output side is connected to the DC energy hub line 31 in parallel to realize energy interaction.

[0050] Among them, taking into account the distribution of renewable energy along the route and the construction conditions, a multi-heterogeneous energy system is constructed independently or in combination, and the newly built new energy power generation and energy supply unit 34 independently or in combination includes a photovoltaic power generation device 341, a wind power generation device 342, a hydropower generation device 343, a micro gas turbine power generation device 344 and / or other available new energy power generation devices; wherein the output end of the photovoltaic array 3412 in the photovoltaic power generation device 341 is connected to the input end of the DC / DC converter V 3411; the wind generator in the wind power generation device 342 The output end 3422 is connected to the AC end of the three-phase AC / DC converter II 3421; the output end of the hydroelectric generator 3432 in the hydroelectric power generation device 343 is connected to the AC end of the three-phase AC / DC converter III 3431; the output end of the micro gas turbine 3442 in the micro gas turbine power generation device 344 is connected to the AC end of the three-phase AC / DC converter IV; the DC output ends of each converter are connected in parallel to the DC energy hub line 31 to realize energy interaction, and each converter independently realizes functions such as AC / DC power conversion and maximum power point tracking.

[0051] The energy storage and comprehensive utilization unit 33 independently or in combination includes an energy storage unit 331, a DC 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 a bidirectional DC / DC converter 3311; the DC charging pile 3322 in the DC charging pile unit 332 is connected to the output end of the DC / DC converter II 3321; the electrolyzer 3332 in the hydrogen production unit 333 is connected to the output end of the DC / DC converter III 3331; the fuel cell stack 3342 in the fuel cell power generation unit 334 is connected to the input end of the DC / DC converter IV 3341; the DC input / output ends of each converter are connected in parallel to the DC energy hub line 31 to realize energy interaction;

[0052] The energy storage and comprehensive utilization unit 33 serves as an energy transfer station. On the one hand, when there is new energy electric energy that cannot be fully absorbed or regenerative braking electric energy that has not been transferred and utilized in the system, this link can directly store the excess electric energy in the energy storage unit 331, or use the excess electric energy through the DC charging pile unit 332 to charge the on-board emergency power supply with energy consumption on the train / or charge the electric vehicles traveling to and from the station, or use the hydrogen production unit 333 to convert the excess electric energy into hydrogen. In addition to supplying fuel to the fuel cell power generation unit 334, the excess hydrogen can also be supplied to nearby local loads. On the other hand, when the power demand on the traction side cannot be fully met, the energy storage unit 331 and the fuel cell power generation unit 334 are replenished with electric energy in a timely manner to ensure the balance of supply and demand of energy for the entire system.

[0053] As an optimization solution of the above embodiment, in addition to adopting a single structure, the self-consistent energy system 2 within the institute can also modularly connect multiple self-consistent energy systems 2 in parallel to form a multiple self-consistent energy system within the institute, such as Figure 4 As shown; In addition to adopting a single structure, the inter-institute self-consistent energy system 4 can also modularly connect multiple inter-institute self-consistent energy systems 4 in parallel to form a multiple inter-institute self-consistent energy system, such as Figure 4 As shown; In addition to adopting a single structure, the interval self-consistent energy system 5 can also modularly connect multiple interval self-consistent energy systems 5 in parallel to form a multiple interval self-consistent energy system, such as Figure 5 As shown, in order to achieve the operation goals of system expansion, fault tolerance, etc.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrified railway multi-scenario self-consistent energy system, characterized in that: It comprises a split-phase traction power supply system (1) and a central controller (6), and also comprises an in-house self-consistent energy system (2), an inter-house self-consistent energy system (4) and / or a section self-consistent energy system (5), wherein the in-house self-consistent energy system (2), the inter-house self-consistent energy system (4) and / or the section self-consistent energy system (5) are independently or combinedly arranged; The in-station self-consistent energy system (2) is arranged at the traction substation power phase (13) of the phase-splitting traction power supply system (1), the inter-station self-consistent energy system (4) is arranged at the substation power phase (14) of the phase-splitting traction power supply system (1), the section self-consistent energy system (5) is arranged on the power supply arm (15) of the phase-splitting traction power supply system (1), and the central controller (6) is communicatively connected with the in-station self-consistent energy system (2), the inter-station self-consistent energy system (4), and the section self-consistent energy system (5); The self-consistent energy system (2) within the station comprises a multi-directional energy routing device ⅠⅠ (21), a multi-heterogeneous new energy supply system Ⅰ (3) and a local control unit Ⅰ (22); the two-phase AC transmission ports of the multi-directional energy routing device Ⅰ (21) are respectively connected between the power supply arm (15) and the rail (16) at the corresponding traction substation electrical phase (13), and the DC transmission port of the multi-directional energy routing device Ⅰ (21) is connected to the DC energy hub 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 both connected in communication with the local control unit Ⅰ (22), and the local control unit Ⅰ (22) is connected in communication with the central controller (6); The inter-station self-consistent energy system (4) structure includes a multi-directional energy routing device II, a multi-heterogeneous new energy supply system II and a local control unit II; the AC transmission port of the multi-directional energy routing device II is respectively connected between the power supply arms (15) and the rails (16) on both sides of the sub-station power phase (14), and the DC transmission port of the multi-directional energy routing device II is connected to the DC energy hub line (31) of the multi-heterogeneous new energy supply system II; the multi-directional energy routing device II and the multi-heterogeneous new energy supply system II are both connected in communication with the local control unit II, and the local control unit II is connected in communication 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 DC support capacitor II (53), a multi-heterogeneous new energy supply system III (54) and a local control unit III (55); wherein the output port of the multi-heterogeneous new energy supply system III (54) is connected to the DC side of the single-phase four-quadrant converter III (52) via the DC support capacitor II (53), the AC side of the single-phase four-quadrant converter III (52) is connected to the secondary side of the single-phase step-down transformer III (51), and the primary side thereof is connected to an independent power supply arm (15); and each component link is connected to the central controller (6) by the local control unit III (55) in communication.

2. The multi-scenario self-consistent energy system for electrified railways according to claim 1 is characterized in that: The multi-directional energy routing device I (21) and the multi-directional energy routing device II have the same structure, comprising a single-phase step-down transformer I (211), a single-phase step-down transformer II (212) and a back-to-back converter (213); the AC sides of the single-phase four-quadrant converter I (2131) and the single-phase four-quadrant converter II (2132) in the back-to-back converter (213) are respectively connected to the secondary sides of the single-phase step-down transformer I (211) and the single-phase step-down transformer II (212), and the DC sides are both connected to the two ends of the DC support capacitor I (2133); the primary sides of the single-phase step-down transformer I (211) and the single-phase step-down transformer II (212) respectively lead out two-phase AC transmission ports, and the two ends of the DC support capacitor I (2133) lead out DC transmission ports, so as to perform multi-directional energy interaction with the split-phase traction power supply system (1) and the multi-heterogeneous new energy supply system.

3. The multi-scenario self-consistent energy system for electrified railways according to claim 1 is 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, including an existing new energy power generation and energy supply unit (32), a newly built new energy power generation and energy supply unit (34) and / or an energy storage and comprehensive utilization unit (33), wherein the existing new energy power generation and energy supply unit (32), the newly built new energy power generation and energy supply unit (34) and / or the energy storage and comprehensive utilization unit (33) are independently or combinedly arranged; the existing new energy power generation and energy supply unit (32), the newly built new energy power generation and energy supply unit (34) and the energy storage and comprehensive utilization unit (33) are connected to the DC energy hub line (31) in parallel.

4. The multi-scenario self-consistent energy system for electrified railways according to claim 3 is characterized in that: The existing new energy power generation and energy supply unit (32) comprises an energy supply device (324) independently utilizing an existing new energy grid-connected power generation system along the line and / or an energy supply device (327) independently utilizing an existing DC microgrid group along the line; The existing renewable energy grid-connected power generation system energy supply device (324) along the line includes, independently or in combination, existing photovoltaic grid-connected power generation system (3241), existing wind grid-connected power generation system (3242), existing hydropower grid-connected power generation system (3243) and / or other renewable energy grid-connected power generation systems along the line. By setting an unabsorbed power transmission point of the same voltage level between the existing grid-connected power generation system and the three-phase public power grid II (3247), the available renewable energy power along the line is collected as much as possible to the AC lightning protection junction box (323). The collected power is stepped down by a three-phase step-down transformer (322) and then rectified into direct current of the required voltage level by a three-phase AC / DC rectifier I (321); wherein the AC side of the three-phase AC / DC rectifier I (321) is connected to the secondary side of the three-phase step-down transformer (322), and the DC side is connected in parallel to the DC energy hub line (31) to realize energy interaction; The existing DC microgrid group energy supply device (327) along the line is independently utilized, including the first DC microgrid (3271) to the nth DC microgrid (3272) available along the line. The electric energy not consumed by the microgrid is merged through the DC lightning protection junction box (326) and then converted into DC power of the required voltage level by the DC / DC converter I (325). The input side of the DC / DC converter I (325) is connected to the DC lightning protection junction box (326), and the output side is connected in parallel to the DC energy hub line (31) to realize energy interaction.

5. The multi-scenario self-consistent energy system for electrified railways according to claim 3 is characterized in that: The newly built new energy power generation and supply unit (34) independently or in combination includes a photovoltaic power generation device (341), a wind power generation device (342), a hydropower generation device (343), a micro gas turbine power generation device (344) and / or other available new energy power generation devices; wherein the output end of the photovoltaic array (3412) in the photovoltaic power generation device (341) is connected to the input end of the DC / DC converter V (3411); the output end of the wind generator (3422) in the wind power generation device (342) is connected to the AC end of the three-phase AC / DC converter II (3421); the output end of the hydropower generator (3432) in the hydropower generation device (343) is connected to the AC end of the three-phase AC / DC converter III (3431); the output end of the micro gas turbine (3442) in the micro gas turbine power generation device (344) is connected to the AC end of the three-phase AC / DC converter IV; the DC output ends of the converters are connected in parallel to the DC energy hub line (31).

6. The multi-scenario self-consistent energy system for electrified railways according to claim 3 is characterized in that: The energy storage and comprehensive utilization unit (33) independently or in combination comprises an energy storage unit (331), a DC charging pile unit (332), a hydrogen production unit (333) and / or a fuel cell power generation unit (334); the output end of the energy storage device (3312) in the energy storage unit (331) is connected to a bidirectional DC / DC converter (3311); the DC charging pile (3322) in the DC charging pile unit (332) is connected to the output end of a DC / DC converter II (3321); the electrolyzer (3332) in the hydrogen production unit (333) is connected to 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 to the input end of a DC / DC converter IV (3341); the DC input / output ends of the converters are connected in parallel to a DC energy hub line (31) to achieve energy interaction.

7. The multi-scenario self-consistent energy system for electrified railways according to claim 1 is characterized in that: The in-house self-consistent energy system (2) adopts a multiple in-house self-consistent energy system, which is composed of multiple in-house self-consistent energy systems (2) connected in parallel in a modular manner; the inter-house self-consistent energy system (4) adopts a multiple inter-house self-consistent energy system, which is composed of multiple inter-house self-consistent energy systems (4) connected in parallel in a modular manner; and the interval self-consistent energy system (5) adopts a multiple interval self-consistent energy system, which is composed of multiple interval self-consistent energy systems (5) connected in parallel in a modular manner.

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