Railway new energy long-distance two-phase sending and accessing system

Abstract

The utility model discloses a kind of railway new energy long-distance two-phase sending and access system, it is related to electrified railway new energy technical field.Power supply and energy storage are through railway energy router, change into the medium-high voltage two-phase alternating current compatible with two-phase of railway traction power supply system, through long-distance two-phase line channel, using source side switch cabinet and net side switch cabinet complete grid connection, exit and protection operation, realize railway new energy long-distance sending and access, effectively solve the technical problem that renewable new energy access railway traction power supply system lacks efficient, low-cost long-distance transmission channel in prior art.

Description

Technical Field

[0001] This utility model belongs to the field of new energy technology for traction power supply of electrified railways, and in particular relates to a long-distance two-phase transmission and access system for new energy in railways. Background Technology

[0002] For a long time, electrified railways have been highly dependent on public power grids that rely mainly on fossil fuels, resulting in persistently high carbon emissions. The integration of green energy with traction power supply systems and the recycling of train regenerative braking energy are becoming trends in the development of electrified railway technology.

[0003] For the segmented and phase-separated traction power supply system commonly used in my country, the existing electrified railway traction power supply system adopts a railway energy router (RER) to integrate new energy access and recover regenerative braking energy from trains, while improving the reactive power and negative sequence problems of the traction power supply system. The invention patent "A Photovoltaic Energy Storage Grid-Connected Device and Control Method for Traction Power Supply System (Application No.: 2016112190862)" is based on a back-to-back inverter connected to two phases of the traction power supply on the AC side, connecting photovoltaic and energy storage to the DC bus of the back-to-back inverter via DC-DC converters, realizing the absorption of new energy and recovery of braking energy in traction power supply. The invention patent "A Traction Power Supply Active Power Integration System and its Control Method (Application No.: 2022103937612)" is based on a single inverter connected across two phases of the traction power supply on the AC side, connecting photovoltaic and energy storage to the DC bus of the back-to-back inverter via DC-DC converters. The invention patent "An Energy Router System and Control Method for Electrified Railways (Application No.: 2023117044307)" is based on a single inverter and a back-to-back inverter connected across two phases of the traction power supply on the AC side. The DC sides of the single inverter and the back-to-back inverter are connected in parallel to the DC bus to form a star structure. The back-to-back inverter mainly undertakes reactive power compensation. Photovoltaic and energy storage are connected to the DC bus via DC-DC converters, realizing the absorption of new energy in traction power supply and the recovery of braking energy. The above patents mainly specify the system for the access of new energy and energy storage in electrified railways. However, new energy generation may be far from the railway. Long-distance transmission lines have high impedance and communication delays, making it difficult to balance voltage drop and source-load power. Further improvements are needed to solve the problems caused by long-distance transmission.

[0004] Based on long-distance transmission, the patent "A Distributed Green Energy Access Traction Power Supply System and Control Method (Application No.: 2023107838485)" proposes to invert and boost the voltage of long-distance green energy power to 10kV or 35kV before transmitting it, and then step down and rectify it to connect it to the railway energy router to achieve long-distance green energy power access to the railway traction power supply system. However, this solution requires additional steps such as inversion, boosting, stepping down, and rectification, which severely reduces system efficiency and significantly increases equipment costs. Moreover, the system before and after inversion is a three-phase system, which is fundamentally different from the two-phase power supply and single-phase power consumption of the traction power supply system, making the system more complex and unfavorable for project management. In addition, existing long-distance transmission systems for wind and solar renewable energy are all three-phase or high-voltage DC systems, which are also incompatible with the two-phase power supply and single-phase power consumption of the traction power supply system, making related technologies unsuitable. Utility Model Content

[0005] In order to overcome the shortcomings of existing technologies, the purpose of this utility model is to propose a railway new energy long-distance two-phase transmission and access system, which solves the technical problem that existing technologies lack efficient and low-cost long-distance transmission channels for renewable new energy to access railway traction power supply systems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a railway new energy long-distance two-phase transmission and access system, comprising: a phase-separated traction power supply system PST and a grid-side a-phase switch cabinet GSS. a Grid-side b-phase switchgear GSS b Long-distance two-phase line DTL, combiner cabinet ACB, source-side switch cabinet SSS i Railway Energy Router (RER) i Energy Storage Unit (ESU) i Power supply GPR i and the central control unit (CCU);

[0007] The phase-separated traction power supply system (PST) includes: phase a circuit, phase b circuit, and rails, located in a railway traction substation or sectioning station;

[0008] The two-phase outputs of the combiner cabinet ACB are connected to the grid-side a-phase switch cabinet GSS via a long-distance two-phase line DTL. a The input terminal and the grid-side b-phase switchgear GSS b Input terminal; Grid-side a-phase switchgear GSS a Output and grid-side b-phase switchgear GSS b The outputs are respectively connected to the a-phase circuit and the b-phase circuit of the phase-splitting traction power supply system PST;

[0009] The railway energy router RER iIt includes a DC port, an AC-side a-phase port, and an AC-side b-phase port, all three ports allowing for bidirectional power flow regulation as needed; the DC port is connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the AC side a-phase port and the AC side b-phase port is connected to the source-side switch cabinet SSS. i Input terminal; Source-side switchgear SSS i The output terminal is connected to the input terminal of the combiner cabinet ACB;

[0010] The signal ports of the Central Control Unit (CCU) are connected to the Phase-Specific Traction Power Supply (PST) system and the Railway Energy Router (RER) respectively. i Power supply GPR i Energy Storage Unit (ESU) i The signal terminals are connected.

[0011] Furthermore, the railway energy router RER i It adopts a back-to-back converter configuration, including a single-phase inverter DAC. a Single-phase inverter DAC b Single-phase transformer SIT a and single-phase transformer SIT b ;

[0012] The single-phase inverter DAC a and single-phase inverter DAC b Both are connected on their DC sides and connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the single-phase inverter DAC; a and single-phase inverter DAC b Both are connected to a single-phase transformer SIT on their AC sides. a and single-phase transformer SIT b The low-pressure side;

[0013] The single-phase transformer SIT a and single-phase transformer SIT b The high-voltage side is connected to the source-side switchgear SSS. i The input terminal.

[0014] Furthermore, the long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, using a double-circuit four-wire system;

[0015] In the A-phase busbar of the combiner block (ACB), the phase line and neutral line are respectively connected to the phase line of the DTL's A-phase circuit. a and neutral line LTLaN In the ACB (Aggregator Busbar), the phase line and neutral line of the b-phase busbar are respectively connected to the b-phase circuit phase line of the DTL (Digital Transmission Line) for long-distance two-phase lines. b and neutral line LTL bN ;

[0016] Then, phase line LTL of phase a loop a and neutral line LTL aN Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail, respectively; the phase wire LTL of the phase b circuit... b and neutral line LTL bN Access network side b-phase switch cabinet GSS b The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail, respectively.

[0017] Furthermore, the long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, using a double-circuit three-wire system;

[0018] The phase line in the a-phase busbar of the combiner block ACB connects to the phase line of the long-distance two-phase line DTL, which is the a-phase loop phase line LTL. a The phase line in the b-phase busbar of the combiner block ACB connects to the b-phase loop phase line of the long-distance two-phase line DTL, LTL. b The neutral wires of both phase a busbar and phase b busbar in the combiner block (ACB) are connected to the neutral wire of the long-distance two-phase line DTL (Local Time Limit Transmission Line). N ;

[0019] Then, phase line LTL of phase a loop a and neutral line LTL N Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail, respectively; the phase wire LTL of the phase b circuit... b and neutral line LTL N Access network side b-phase switch cabinet GSS b The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail, respectively.

[0020] Furthermore, the source-side switchgear SSS i It includes phase a output terminal, phase b output terminal, and neutral output terminal, and is respectively connected to the phase a busbar, phase b busbar, and neutral busbar of the combiner cabinet ACB.

[0021] Furthermore, the railway energy router RER i The system employs a cross-phase converter with reactive power compensation, including a cross-phase single-phase inverter (IBI) and a reactive power compensation device (RPO). a Reactive power compensation equipment RPO b And single-phase transformer SIT;

[0022] The DC side of the cross-phase single-phase inverter IBI is connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the two AC ports of the cross-phase single-phase inverter IBI is respectively connected in parallel with reactive power compensation devices RPO. a Reactive power compensation equipment RPO b It is then connected to the two low-voltage side ports of the single-phase transformer SIT;

[0023] The high-voltage side of the single-phase transformer SIT and the reactive power compensation device RPO a Reactive power compensation equipment RPO b The neutral wires are connected to the source-side switch cabinet SSS respectively. i The input terminal;

[0024] Furthermore, the long-distance two-phase line DTL is a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower. The a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N ;

[0025] Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

[0026] Furthermore, the railway energy router RER i It adopts a converter form with dual SVG star topology, including a cross-phase single-phase inverter (IBI) and a static var generator (SVG). aStatic Var Generator (SVG) b And single-phase transformer SIT;

[0027] The cross-phase single-phase inverter IBI and static var generator SVG a Static Var Generator (SVG) b The three components are connected to the DC side and connected to the power supply GPR. i Or power supply GPR i With energy storage unit ESU i The combination;

[0028] The two AC ports of the cross-phase single-phase inverter IBI are respectively connected to the static var generator (SVG). a Static Var Generator (SVG) b After being connected in parallel on the AC side, it is then connected to the railway energy router RER. i The two low-voltage ports of the single-phase transformer SIT in the middle are connected.

[0029] The high-voltage side of the single-phase transformer SIT and the static var generator SVG a Static Var Generator (SVG) b The neutral wires are connected to the source-side switch cabinet SSS respectively. i The input terminal.

[0030] Furthermore, the long-distance two-phase line DTL is either a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower. The a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N ;

[0031] Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

[0032] Furthermore, the source-side switchgear SSS i ,GSS phase a switchgear on the grid side aand the grid-side B-phase switchgear GSS b Each includes at least one of disconnecting switches and circuit breakers.

[0033] The beneficial effects of adopting this technical solution are:

[0034] This invention proposes a long-distance two-phase transmission and access system for railway new energy sources. The power source and energy storage are converted into medium-high voltage two-phase AC power compatible with the railway traction power supply system via a railway energy router. A suitable long-distance two-phase line channel for railway new energy transmission and access is invented. An interface connection topology for long-distance new energy sources, railway energy routers, switchgear, combiner cabinets, long-distance two-phase lines, and the traction power supply system is proposed. Grid connection, disconnection, and protection operations are completed using source-side and grid-side switchgear, realizing long-distance transmission and access of railway new energy sources. This effectively solves the technical problem of the lack of efficient and low-cost long-distance transmission channels for renewable energy access to railway traction power supply systems in existing technologies. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a railway new energy long-distance two-phase transmission and access system according to the present invention;

[0036] Figure 2 This is a system structure topology diagram of the first embodiment of the present invention;

[0037] Figure 3 This is a system structure topology diagram of the second embodiment of the present invention;

[0038] Figure 4 This is a system structure topology diagram of the third embodiment of the present invention;

[0039] Figure 5 This is a system structure topology diagram of the fourth embodiment of the present invention. Detailed Implementation

[0040] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described below with reference to the accompanying drawings.

[0041] In this embodiment, see Figures 1-5 As shown, a railway new energy long-distance two-phase transmission and access system is described.

[0042] As attached Figure 1 The diagram shown is a topology diagram of a long-distance two-phase power transmission and access system for new energy in railways according to the present invention. The system includes a phase-separated traction power supply system (PST) and a railway energy router (RER). i Energy Storage Unit (ESU) i Power supply GPR i Source-side switchgear SSSi Combiner cabinet (ACB), long-distance two-phase line (DTL), grid-side phase a switch cabinet (GSS) a Grid-side b-phase switchgear GSS b And the central control unit (CCU), where i is a positive integer from 1 to n and n is a positive integer ≥ 1.

[0043] The phase-separated traction power supply system (PST) consists of a phase a circuit, a phase b circuit, and rails, and is located in a railway traction substation or sectioning station.

[0044] The two-phase outputs of the combiner cabinet ACB are connected to the grid-side a-phase switch cabinet GSS via a long-distance two-phase line DTL. a The input terminal and the grid-side b-phase switchgear GSS b Input terminal; Grid-side a-phase switchgear GSS a Output and grid-side b-phase switchgear GSS b The outputs are respectively connected to the a-phase circuit and the b-phase circuit of the phase-splitting traction power supply system PST;

[0045] The railway energy router RER i It includes a DC port, an AC-side A-phase port, and an AC-side B-phase port, all three ports allowing for bidirectional power flow regulation as needed;

[0046] Green energy sources such as wind and solar power, located far from railway traction substations or substations, are divided into n (n is a positive integer ≥ 1) power generation zones based on spatial distance. The green energy in the i-th zone (i = 1 to n is a positive integer) forms a controllable DC power generation source GPR. i Equipped with energy storage unit ESU i Connect to the railway energy router RER at the nearest location. i DC side, railway energy router RER i The AC side phase a port and AC side phase b port are connected to the source side switch cabinet SSS. i Source-side switchgear SSS1, ..., Source-side switchgear SSS i ..., source-side switchgear SSS n The output terminals of a total of n source-side switchgear are connected to the input terminals of the combiner cabinet ACB;

[0047] The signal ports of the Central Control Unit (CCU) are connected to the Phase-Specific Traction Power Supply (PST) system and the Railway Energy Router (RER) respectively. i Power supply GPR i Energy Storage Unit (ESU) i The signal terminal is connected to monitor and analyze traction load operating parameters and control the generator GPR. i Output and energy storage unit (ESU) i Charge and discharge and railway energy routers (RER)i In operation, it enables long-distance transmission of new energy power generation to supply power to traction loads, and realizes the recovery and utilization of braking energy and optimization of power quality in the traction power supply system.

[0048] Preferably, the railway energy router (RER) i The AC side a-phase port and AC side b-phase port output single-phase electricity at a voltage level of 27.5kV.

[0049] Preferably, the source-side switchgear SSS i ,GSS phase a switchgear on the grid side a and the grid-side B-phase switchgear GSS b Each includes at least one of disconnecting switches and circuit breakers.

[0050] The power source GPR i Including but not limited to one or more of photovoltaic, wind power, hydropower, and fuel cells.

[0051] The energy storage unit ESU i Including but not limited to one or more of lithium titanate batteries, lithium iron phosphate batteries, solid-state batteries, semi-solid-state batteries, and sodium-ion batteries.

[0052] As attached Figure 2 The diagram shown is a system topology diagram of the first embodiment of this utility model. The system includes a phase-separated traction power supply system (PST) and a railway energy router (RER). i Energy Storage Unit (ESU) i Power supply GPR i Source-side switchgear SSS i Combiner cabinet (ACB), long-distance two-phase line (DTL), grid-side phase a switch cabinet (GSS) a Grid-side b-phase switchgear GSS b The system includes a central control unit (CCU), where i is a positive integer from 1 to n, and n is a positive integer ≥ 1. The phase-separated traction power supply system (PST) consists of phase a circuit, phase b circuit, and rails, and is located at a railway traction substation or sectioning station.

[0053] The railway energy router RER i It adopts a back-to-back converter configuration, including a single-phase inverter DAC. a Single-phase inverter DAC b Single-phase transformer SIT a Single-phase transformer SIT b Composition, single-phase inverter DAC a and single-phase inverter DAC b Both are connected to the DC side and connected to the power source GPR. i and energy storage unit ESU iSingle-phase inverter DAC a and single-phase inverter DAC b Both are connected to a single-phase transformer SIT on their AC sides. a and single-phase transformer SIT b On the low-voltage side, single-phase transformer SIT a and single-phase transformer SIT b The high-voltage side is connected to the source-side switchgear SSS. i Input terminals; Source-side switchgear SSS1, ..., Source-side switchgear SSS i ..., source-side switchgear SSS n A total of n source-side switchgear units have their a-phase output terminals and b-phase output terminals connected to the a-phase busbar and b-phase busbar of the combiner cabinet ACB, respectively. The long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, using a double-circuit four-wire system. The phase wire and neutral wire in the a-phase busbar of the combiner cabinet ACB are respectively connected to the a-phase loop phase wire LTL of the long-distance two-phase line DTL. a and neutral line LTL aN In the ACB (Aggregator Busbar), the phase line and neutral line of the b-phase busbar are respectively connected to the b-phase circuit phase line of the DTL (Digital Transmission Line) for long-distance two-phase lines. b and neutral line LTL bN Then phase a circuit phase line LTL a and neutral line LTL aN Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail (grounded) respectively, and the phase wire LTL of the phase b circuit is connected to the rail. b and neutral line LTL bN Access network side b-phase switch cabinet GSS b The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail (grounded), respectively.

[0054] As attached Figure 3 The diagram shown is a system topology diagram of the second embodiment of this utility model. The system includes a phase-separated traction power supply system (PST) and a railway energy router (RER). i Energy Storage Unit (ESU) i Power supply GPR i Source-side switchgear SSS i Combiner cabinet (ACB), long-distance two-phase line (DTL), grid-side phase a switch cabinet (GSS) a Grid-side b-phase switchgear GSS bThe system includes a central control unit (CCU), where i is a positive integer from 1 to n, and n is a positive integer ≥ 1. The phase-separated traction power supply system (PST) consists of phase a circuit, phase b circuit, and rails, and is located at a railway traction substation or sectioning station.

[0055] The railway energy router RER i It adopts a back-to-back converter configuration, including a single-phase inverter DAC. a Single-phase inverter DAC b Single-phase transformer SIT a Single-phase transformer SIT b Composition, single-phase inverter DAC a and single-phase inverter DAC b Both are connected to the DC side and connected to the power source GPR. i and energy storage unit ESU i Single-phase inverter DAC a and single-phase inverter DAC b Both are connected to a single-phase transformer SIT on their AC sides. a and single-phase transformer SIT b On the low-voltage side, single-phase transformer SIT a and single-phase transformer SIT b The high-voltage side is connected to the source-side switchgear SSS. i Input terminals; Source-side switchgear SSS1, ..., Source-side switchgear SSS i ..., source-side switchgear SSS n A total of n source-side switchgear units have their phase a and phase b output terminals connected to the phase a busbar and phase b busbar of the combiner cabinet ACB, respectively. The long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, using a double-circuit three-wire system. The phase wire in the phase a busbar of the combiner cabinet ACB is connected to the phase wire LTL of the phase a circuit of the long-distance two-phase line DTL. a The phase line in the b-phase busbar of the combiner block ACB connects to the b-phase loop phase line of the long-distance two-phase line DTL, LTL. b The neutral wires of both phase a busbar and phase b busbar of the combiner block ACB are connected to the neutral wire of the long-distance two-phase line DTL, LTL. N Then phase a circuit phase line LTL a and neutral line LTL N Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail (grounded) respectively, and the phase wire LTL of the phase b circuit is connected to the rail. b and neutral line LTL N Access network side b-phase switch cabinet GSSb The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail (grounded), respectively.

[0056] As attached Figure 4 The diagram shown is a system topology diagram of the third embodiment of this utility model. The system includes a phase-separated traction power supply system (PST) and a railway energy router (RER). i Energy Storage Unit (ESU) i Power supply GPR i Source-side switchgear SSS i Combiner cabinet (ACB), long-distance two-phase line (DTL), grid-side phase a switch cabinet (GSS) a Grid-side b-phase switchgear GSS b The system includes a central control unit (CCU), where i is a positive integer from 1 to n, and n is a positive integer ≥ 1. The phase-separated traction power supply system (PST) consists of phase a circuit, phase b circuit, and rails, and is located at a railway traction substation or sectioning station.

[0057] The railway energy router RER i The system employs a cross-phase converter with reactive power compensation, including a cross-phase single-phase inverter (IBI) and a reactive power compensation device (RPO). a Reactive power compensation equipment RPO b And single-phase transformer SIT, railway energy router RER i The DC side of the interphase single-phase inverter (IBI) is connected to the power source GPR. i and energy storage unit ESU i Railway Energy Router (RER) i The AC side of the intermediate phase single-phase inverter (IBI) is connected in parallel with reactive power compensation devices (RPOs). a Reactive power compensation equipment RPO b It is then connected to the two low-voltage side ports of the single-phase transformer SIT, the railway energy router RER. i High-voltage side two-port of single-phase transformer SIT and reactive power compensation equipment RPO a Reactive power compensation equipment RPO b The neutral wires are connected to the source-side switch cabinet SSS respectively. i The input terminal (it should be noted that the reactive power compensation device RPO) a Reactive power compensation equipment RPO b Connecting them in parallel to the two high-voltage sides of a single-phase transformer SIT has the same effect and is also within the scope of this patent protection; Source-side switchgear SSS i Includes phase a output terminal, phase b output terminal, and neutral output terminal, source-side switchgear SSS1, ..., source-side switchgear SSS i ..., source-side switchgear SSSn The output terminals (a-phase port, b-phase port, and neutral port) of the n source-side switchgear are respectively connected to the a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB; the long-distance two-phase line DTL is a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower, and the a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

[0058] As attached Figure 5 The diagram shown is a system topology diagram of the fourth embodiment of this utility model. The system includes a phase-separated traction power supply system (PST) and a railway energy router (RER). i Energy Storage Unit (ESU) i Power supply GPR i Source-side switchgear SSS i Combiner cabinet (ACB), long-distance two-phase line (DTL), grid-side phase a switch cabinet (GSS) a Grid-side b-phase switchgear GSS b The system includes a central control unit (CCU), where i is a positive integer from 1 to n, and n is a positive integer ≥ 1. The phase-separated traction power supply system (PST) consists of phase a circuit, phase b circuit, and rails, and is located at a railway traction substation or sectioning station.

[0059] The railway energy router RER i It adopts a converter form with dual SVG star topology, including a cross-phase single-phase inverter (IBI) and a static var generator (SVG). a Static Var Generator (SVG) b And single-phase transformer SIT, railway energy router RER i The interphase single-phase inverter (IBI) and static var generator (SVG) in the middle a Static Var Generator (SVG) b The three components are connected to the DC side and connected to the power supply GPR.i and energy storage unit ESU i Railway Energy Router (RER) i The two AC ports of the IBI (Interphase Inverter) are connected to the Static Var Generator (SVG) respectively. a Static Var Generator (SVG) b After being connected in parallel on the AC side, it is then connected to the railway energy router RER. i The two low-voltage ports of the single-phase transformer SIT in the railway energy router RER are connected. i The high-voltage side two-port of the single-phase transformer SIT and the static var generator (SVG) a Static Var Generator (SVG) b The neutral wires are connected to the source-side switch cabinet SSS respectively. i The input terminal (it should be noted that the static var generator SVG) a Static Var Generator (SVG) b Connecting them in parallel to the two high-voltage sides of a single-phase transformer SIT has the same effect and is also within the scope of this patent protection; Source-side switchgear SSS i Includes phase a output terminal, phase b output terminal, and neutral output terminal, source-side switchgear SSS1, ..., source-side switchgear SSS i ..., source-side switchgear SSS n The output terminals (a-phase port, b-phase port, and neutral port) of the n source-side switchgear are respectively connected to the a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB; the long-distance two-phase line DTL is a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower, and the a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

[0060] The working principle of this utility model is as follows: the power source and energy storage are converted into single-phase AC power that is compatible with the two-phase power supply system of the railway traction power supply system via the railway energy router. The power is then transmitted through a long-distance two-phase line channel, and grid connection, disconnection and protection operations are completed by the source-side switch cabinet and the grid-side switch cabinet.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A railway new energy long-distance two-phase transmission and access system, characterized in that, include: Phase-separated traction power supply system PST, grid-side a-phase switchgear GSS a Grid-side b-phase switchgear GSS b Long-distance two-phase line DTL, combiner cabinet ACB, source-side switch cabinet SSS i Railway Energy Router (RER) i Energy Storage Unit (ESU) i Power supply GPR i and the central control unit (CCU); The phase-separated traction power supply system (PST) includes: phase a circuit, phase b circuit, and rails, located in a railway traction substation or sectioning station; The two-phase outputs of the combiner cabinet ACB are connected to the grid-side a-phase switch cabinet GSS via a long-distance two-phase line DTL. a The input terminal and the grid-side b-phase switchgear GSS b Input terminal; Grid-side a-phase switchgear GSS a Output and grid-side b-phase switchgear GSS b The outputs are respectively connected to the a-phase circuit and the b-phase circuit of the phase-splitting traction power supply system PST; The railway energy router RER i It includes a DC port, an AC-side a-phase port, and an AC-side b-phase port, all three ports allowing for bidirectional power flow regulation as needed; the DC port is connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the AC side a-phase port and the AC side b-phase port is connected to the source-side switch cabinet SSS. i Input terminal; Source-side switchgear SSS i The output terminal is connected to the input terminal of the combiner cabinet ACB; The signal ports of the Central Control Unit (CCU) are connected to the Phase-Specific Traction Power Supply (PST) system and the Railway Energy Router (RER) respectively. i Power supply GPR i Energy Storage Unit (ESU) i The signal terminals are connected.

2. The railway new energy long-distance two-phase transmission and access system according to claim 1, characterized in that, The railway energy router RER i It adopts a back-to-back converter configuration, including a single-phase inverter DAC. a Single-phase inverter DAC b Single-phase transformer SIT a and single-phase transformer SIT b ; The single-phase inverter DAC a and single-phase inverter DAC b Both are connected on their DC sides and connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the single-phase inverter DAC; a and single-phase inverter DAC b Both are connected to a single-phase transformer SIT on their AC sides. a and single-phase transformer SIT b The low-pressure side; The single-phase transformer SIT a and single-phase transformer SIT b The high-voltage side is connected to the source-side switchgear SSS. i The input terminal; the source-side switch cabinet SSS i It includes phase a output terminal and phase b output terminal, and is connected to the phase a busbar and phase b busbar of the combiner cabinet ACB respectively.

3. A railway new energy long-distance two-phase transmission and access system according to claim 2, characterized in that, The long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, using a double-circuit four-wire system. In the A-phase busbar of the combiner block (ACB), the phase line and neutral line are respectively connected to the phase line of the DTL's A-phase circuit. a and neutral line LTL aN In the ACB (Aggregator Busbar), the phase line and neutral line of the b-phase busbar are respectively connected to the b-phase circuit phase line of the DTL (Digital Transmission Line) for long-distance two-phase lines. b and neutral line LTL bN ; Then, phase line LTL of phase a loop a and neutral line LTL aN Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail, respectively; the phase wire LTL of the phase b circuit... b and neutral line LTL bN Access network side b-phase switch cabinet GSS b The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail, respectively.

4. A railway new energy long-distance two-phase transmission and access system according to claim 2, characterized in that, The long-distance two-phase line DTL is a double-circuit cable line in the same trench or a double-circuit overhead line on the same tower, and adopts a double-circuit three-wire system. The phase line in the a-phase busbar of the combiner block ACB connects to the phase line of the long-distance two-phase line DTL, which is the a-phase loop phase line LTL. a The phase line in the b-phase busbar of the combiner block ACB connects to the b-phase loop phase line of the long-distance two-phase line DTL, LTL. b The neutral wires of both phase a busbar and phase b busbar in the combiner block (ACB) are connected to the neutral wire of the long-distance two-phase line DTL (Digital Transmission Line) LTL. N ; Then, phase line LTL of phase a loop a and neutral line LTL N Access network side phase a switch cabinet GSS a The input terminal of the grid-side a-phase switchgear GSS a The phase and neutral wires at the output terminals are connected to the traction phase a circuit and the rail, respectively; the phase wire LTL of the phase b circuit... b and neutral line LTL N Access network side b-phase switch cabinet GSS b The input terminal of the grid-side b-phase switchgear GSS b The phase line and neutral line at the output end are connected to the traction phase b circuit and the rail, respectively.

5. A railway new energy long-distance two-phase transmission and access system according to claim 1, characterized in that, Source-side switchgear SSS i It includes phase a output terminal, phase b output terminal and neutral output terminal, and is respectively connected to the phase a busbar, phase b busbar and neutral busbar of the combiner cabinet ACB.

6. A railway new energy long-distance two-phase transmission and access system according to claim 1 or 5, characterized in that, The railway energy router RER i The system employs a cross-phase converter with reactive power compensation, including a cross-phase single-phase inverter (IBI) and a reactive power compensation device (RPO). a Reactive power compensation equipment RPO b and single-phase transformer SIT; The DC side of the cross-phase single-phase inverter IBI is connected to the power source GPR. i Or power supply GPR i With energy storage unit ESU i The combination of the two AC ports of the cross-phase single-phase inverter IBI is respectively connected in parallel with reactive power compensation devices RPO. a Reactive power compensation equipment RPO b It is then connected to the two low-voltage side ports of the single-phase transformer SIT; The high-voltage side of the single-phase transformer SIT and the reactive power compensation device RPO a Reactive power compensation equipment RPO b The neutral wires are connected to the source-side switch cabinet SSS respectively. i The input terminal.

7. A railway new energy long-distance two-phase transmission and access system according to claim 6, characterized in that, The long-distance two-phase line DTL is a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower. The a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N ; Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

8. A railway new energy long-distance two-phase transmission and access system according to claim 1 or 5, characterized in that, The railway energy router RER i It adopts a converter form with dual SVG star topology, including a cross-phase single-phase inverter (IBI) and a static var generator (SVG). a Static Var Generator (SVG) b and single-phase transformer SIT; The cross-phase single-phase inverter IBI and static var generator SVG a Static Var Generator (SVG) b The three components are connected to the DC side and connected to the power supply GPR. i Or power supply GPR i With energy storage unit ESU i The combination; The two AC ports of the cross-phase single-phase inverter IBI are respectively connected to the static var generator (SVG). a Static Var Generator (SVG) b After being connected in parallel on the AC side, it is then connected to the railway energy router RER. i The two low-voltage ports of the single-phase transformer SIT in the middle are connected. The high-voltage side of the single-phase transformer SIT and the static var generator SVG a Static Var Generator (SVG) b The neutral wires are respectively connected to the source-side switch cabinet SSS. i The input terminal.

9. A railway new energy long-distance two-phase transmission and access system according to claim 8, characterized in that, The long-distance two-phase line DTL is a double-circuit three-wire cable line in the same trench or a double-circuit three-wire overhead line on the same tower. The a-phase busbar, b-phase busbar, and neutral busbar of the combiner cabinet ACB are respectively connected to the a-phase line LTL of the long-distance two-phase line DTL. a b-phase line LTL b and neutral line LTL N Then, phase a line LTL a and neutral line LTL N Connect to the grid-side a-phase switchgear GSS respectively a The input terminal of the grid-side a-phase switchgear GSS a The output terminals of phase a and neutral are connected to the traction phase a circuit and the rail, respectively; phase b line LTL b and neutral line LTL N Connect to the B-phase switchgear GSS on the grid side respectively b The input terminal of the grid-side b-phase switchgear GSS b The output terminals of phase b and neutral are respectively connected to the traction phase b circuit and the rail.

10. A railway new energy long-distance two-phase transmission and access system according to any one of claims 1-5, characterized in that, The source-side switchgear SSS i ,GSS phase a switchgear on the grid side a and the grid-side B-phase switchgear GSS b Each includes at least one of disconnecting switches and circuit breakers.

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