Train continuous power supply system and method applied between main line and branch line

Abstract

The application relates to the technical field of electrified railway traction power supply, and particularly provides a train uninterrupted power supply system and method applied to a main line and a branch line, which comprises a first substation connected to a main line catenary, a second substation connected to a branch line catenary, and a switch station arranged on the branch line catenary and located on one side of the second substation close to the main line catenary; the switch station comprises an electric section and a section feeder circuit breaker, wherein the electric section is arranged in series on the branch line catenary, and the section feeder circuit breaker is arranged in parallel at both ends of the electric section. The application realizes dynamic connection of the branch line and the main line power supply system through the cooperative power supply of the first substation, the second substation and the switch station, supports cross-zone power supply by the first substation when the switch station is turned on, and can be taken over by the local second substation after the switch station is turned off, so that the main line catenary can be safely isolated in the car collection and maintenance stage.

Description

Technical Field

[0001] This application relates to the field of traction power supply technology for electrified railways, and in particular to an uninterrupted power supply system and method for trains used between main lines and branch lines. Background Technology

[0002] In electrified railway traction power supply systems, the mainline overhead contact system undertakes the high-frequency, high-stability power supply needs of mainline trains, while the branch line overhead contact system mainly serves train operation, short-distance dispatching, and maintenance work in areas such as depots, parking lots, and freight branch lines. Currently, electrified railway traction power supply systems generally adopt a phase-switching single-sided power supply method. Adjacent traction substations are separated by an electrical phase-splitting device, and each power supply section is powered by only a single substation with different phase sequences connected in rotation.

[0003] Therefore, in existing mainline and branchline connection structures within the same power supply section, a single disconnecting switch is typically used to switch the branchline contact network and the mainline contact network on and off, achieving electrical isolation between the branchline section and the mainline contact network. However, when the mainline contact network needs to be de-energized for maintenance due to equipment wear, fault diagnosis, or routine maintenance, the power supply output from the substation to the mainline must be cut off, at which point the branchline contact network will also be de-energized simultaneously. Similarly, since the mainline and branchline contact networks share a power supply circuit, if the branchline contact network needs to be kept energized or if maintenance is performed on the branchline in the depot, the mainline contact network must be energized simultaneously, making electrical isolation between the mainline and branchline contact networks impossible. Especially during peak periods and other times with dense train scheduling, this conflict can cause transportation delays and affect the overall line operation efficiency. Summary of the Invention

[0004] To address the aforementioned issues, this application provides an uninterrupted power supply system and method for trains operating between main lines and branch lines. Through coordinated control of the switching station and the first and second substations, branch line trains can enter the main line with power during departure, and the main line enters maintenance phase while the branch line trains in the depot maintain power supply for maintenance during return, significantly improving transportation efficiency.

[0005] To achieve the objectives of this application, the following technical solution is provided: In a first aspect, this application provides an uninterruptible power supply system for trains used between main lines and branch lines, comprising: The first substation is connected to the main line contact network; The second substation is connected to the branch contact network; A switching station is provided on the branch contact network and located on the side of the second substation closer to the main contact network; the switching station includes an electrical section and a section feeder circuit breaker, wherein the electrical section is connected in series on the branch contact network, and the section feeder circuit breaker is connected in parallel at both ends of the electrical section.

[0006] A further improvement of the present invention is that the switch station further includes a disconnecting switch, which is connected in series with the sectional feeder circuit breaker and then connected in parallel with the electrical sectionalizing section.

[0007] A further improvement of the present invention is that the switch station further includes a segmented busbar, which is connected in parallel to both ends of the electrical segment; wherein, one end of the segmented feeder circuit breaker is connected to the segmented busbar, and the other end of the segmented feeder circuit breaker is connected to the branch contact network of the electrical segment near the main contact network; one end of the disconnecting switch is connected to the segmented busbar, and the other end of the disconnecting switch is connected to the branch contact network of the electrical segment away from the main contact network.

[0008] A further improvement of the present invention is that the switch station further includes a segmented busbar, which is connected in parallel to both ends of the electrical segment; wherein, one end of the segmented feeder circuit breaker is connected to the segmented busbar, and the other end of the segmented feeder circuit breaker is connected to the branch contact network of the electrical segment near the main contact network; one end of the disconnecting switch is connected to the segmented busbar, and the other end of the disconnecting switch is connected to the segmented feeder circuit breaker.

[0009] A further improvement of the present invention is that the first substation includes a first main transformer, a first traction bus, and a first feeder circuit breaker connected in sequence, the first feeder circuit breaker being connected to the main line contact network; the second substation includes a second main transformer, a second traction bus, and a second feeder circuit breaker connected in sequence, the second feeder circuit breaker being connected to the branch line contact network.

[0010] Secondly, this application provides a method for uninterrupted power supply to trains between main lines and branch lines, applied to the aforementioned uninterrupted power supply system for trains, the method comprising: When the trains are in the off-line state, after all the running trains have entered the branch line, the first feeder circuit breaker of the first substation is opened, the section feeder circuit breaker of the switching station is opened, and the second feeder circuit breaker of the second substation is closed, so that the trains on the branch line contact network are powered by the second substation for maintenance, and the main line contact network enters the maintenance window. When the train is in the departure state, the second feeder circuit breaker is controlled to open, the section feeder circuit breaker of the switching station is controlled to close, and the first feeder circuit breaker is controlled to close, so that the train on the branch line contact network is powered by the first substation, so that the train can enter the main line contact network from the branch line contact network without interrupting power supply.

[0011] A further improvement of the present invention is that the switching station includes an electrical section, a disconnecting switch, and the section feeder circuit breaker. The electrical section is connected in series on the branch contact network. The disconnecting switch and the section feeder circuit breaker are connected in parallel at both ends of the electrical section. When isolation is required for train departure, the section feeder circuit breaker is first opened, and then the disconnecting switch is opened. When conduction is required for train departure, the disconnecting switch is first closed, and then the section feeder circuit breaker is closed, so that the electrical section is bypassed.

[0012] A further improvement of the present invention is that, in the event of an abnormality in the first substation causing it to shut down, the second feeder circuit breaker is controlled to close, and the disconnecting switch and the sectional feeder circuit breaker are controlled to be in the closed state, so as to enable the second substation to provide support power to the main line contact network.

[0013] A further improvement of the present invention is that, in the event of an abnormality in the second substation causing it to shut down, the first feeder circuit breaker is controlled to close, and the disconnecting switch and the sectional feeder circuit breaker are controlled to be in the closed state, so as to enable the first substation to provide power support to the branch contact network.

[0014] A further improvement of the present invention is that both the first substation and the second substation adopt single-sided power supply.

[0015] Therefore, through the coordination of the switchyard circuit breakers, the mainline substation feeder circuit breakers, and the branch line substation feeder circuit breakers, when a train returns to the branch line for maintenance without power interruption, the switchyard circuit breaker is opened to disconnect it from the main line, allowing the main line to be de-energized for maintenance. When a train departs, power is cut off at the branch line substation, the switchyard circuit breaker is closed, and power is restored through the mainline substation, allowing the train to enter the main line for operation. When the required train leaves the branch line, the switchyard circuit breaker can be opened, allowing the branch line to be maintained.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The uninterrupted power supply system and method for trains operating between main lines and branch lines provided in this application achieve dynamic connection between the power supply systems of the branch lines and the main lines through the coordinated power supply of the first substation, the second substation, and the switching station. It supports cross-regional power supply from the first substation when the switching station is operational, and allows the local second substation to take over after the switching station is disconnected, thus safely isolating the main line contact network during depot maintenance. Therefore, it satisfies the need for uninterrupted train operation while ensuring the autonomy of branch line power supply during depot maintenance. Attached Figure Description

[0017] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. Figure 1 This is a schematic diagram of the normal operating state of a power supply system for uninterrupted train operation and maintenance, as shown in some embodiments of this specification. Figure 2 This is a schematic diagram of the mainline maintenance status of the power supply system for uninterrupted operation and maintenance of trains, as shown in some embodiments of this specification. Figure 3 This is a schematic diagram of the power supply system status when the first substation is out of service, as shown in some embodiments of this specification.

[0018] Figure label: 1. First Substation; 11. First Main Transformer; 12. First Traction Busbar; 13. First Feeder Circuit Breaker; 2. Second Substation; 21. Second Main Transformer; 22. Second Traction Busbar; 23. Second Feeder Circuit Breaker; 3. Switching Station; 31. Electrical Section; 32. Section Feeder Circuit Breaker; 33. Disconnecting Switch; 34. Section Busbar; 4. Main Line Contact Network; 5. Branch Line Contact Network. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0021] In electrified railway traction power supply systems, the mainline overhead contact system meets the high-frequency, high-stability power supply needs of mainline trains, undertaking the crucial task of providing electrical energy to trains operating on the mainline. The branch line overhead contact system primarily serves train operation, short-distance dispatching, and maintenance work in areas such as depots, parking lots, and freight branch lines. Currently, electrified railway traction power supply systems generally adopt a single-phase power supply method, where adjacent traction substations are separated by an electrical phase-splitting device, and each power supply section is powered by only a single substation with different phase sequences alternately connected.

[0022] In schemes where the main line contact network and the branch line contact network are located in the same power supply section, the main line and branch line contact networks are often designed as a single interconnected system, with simple on / off switching achieved only through a single isolating switch. When the main line contact network needs to be shut down for maintenance due to equipment wear, fault diagnosis, or other requirements, the existing scheme requires cutting off the power supply output from the substation to the main line. Since the main line and branch line are connected, the branch line contact network will also be de-energized simultaneously. At this time, trains on the branch line in the depot cannot be energized for maintenance. If the main line power outage is postponed to ensure power supply for the branch line trains, it will delay the main line maintenance progress, creating a conflict between main line maintenance and branch line train power supply. To solve this problem, the main line contact network and the branch line contact network are usually maintained alternately through time scheduling. However, this not only affects transportation efficiency but also results in a serious lack of adaptability of the power supply system to multiple operation scenarios, making it difficult to meet the refined operation requirements of complex lines.

[0023] Furthermore, when the mainline contact network and the branchline contact network are located in different (adjacent) power supply sections, the power outage zone formed by the phase separation will require trains to undergo a forced power outage process when passing through, resulting in traction interruption, speed loss, and electric braking failure. This will further amplify the negative impact of the power outage zone in urban rail transit scenarios with short station spacing and high train density.

[0024] To address the aforementioned technical problems, the present invention proposes the following technical solutions and corresponding embodiments.

[0025] The following is combined Figures 1 to 3 The illustrated embodiments describe the technical solution of the present invention: Example 1 This application provides an embodiment of a train uninterruptible power supply system applied between a main line and a branch line, referring to... Figure 1 As shown, the system includes a first substation 1 connected to the main line contact network 4, a second substation 2 connected to the branch line contact network 5, and a switch station 3. The switch station 3 is located on the branch line contact network 5 and on the side of the second substation 2 closer to the main line contact network 4, and is used to control the connection and disconnection of the contact network between the branch line contact network 5 and the main line contact network 4. The switch station 3 includes an electrical section 31 and a section feeder circuit breaker 32. The electrical section 31 is connected in series on the branch line contact network 5, and the section feeder circuit breaker 32 is connected in parallel at both ends of the electrical section 31.

[0026] In this embodiment, a substation is a power facility that provides traction power to electrified railways, converting high-voltage grid power into a voltage level suitable for train operation via transformers. In this embodiment, the first substation 1 includes a first main transformer 11, a first traction busbar 12, and a first feeder circuit breaker 13 connected in sequence, with the first feeder circuit breaker 13 connected to the main line contact network 4. The second substation 2 includes a second main transformer 21, a second traction busbar 22, and a second feeder circuit breaker 23 connected in sequence, with the second feeder circuit breaker 23 connected to the branch line contact network 5. Both the first and second substations in this embodiment use single-sided power supply.

[0027] In this embodiment, the mainline contact network 4 is an contact network erected along the mainline track to supply power to the running train; the branchline contact network 5 is a dedicated contact network connecting the depot, maintenance base, and mainline, used for power supply during train entry and exit from the depot and during maintenance. Here, the power supply range of the branchline contact network 5 is relatively small, while the mainline contact network 4 has relatively high power supply reliability and stability.

[0028] In this embodiment, the switching station 3 is a facility used to achieve electrical isolation in the traction power supply system. By setting up the electrical segmentation device 31, the contact network is divided into independent power supply sections, allowing trains to pass through without interruption of power. The switching station 3 is located on the side of the second substation 2 close to the main line contact network 4. This layout ensures that the branch line and the main line power supply system can be dynamically connected through the switching station 3, forming a power supply architecture of "zoned control and on-demand connection".

[0029] Therefore, the power supply system achieves uninterrupted train operation between the main line and the depot branch line by intelligently controlling the connection status of the main line contact network 4 and the branch line contact network 5 through the switch station 3.

[0030] Figure 1 This is a schematic diagram illustrating the normal operating state of a power supply system for uninterrupted train operation and maintenance, according to some embodiments of this specification. In this embodiment, the branch line contact network 5 is a depot branch line. (Refer to...) Figure 1 As shown, when a train needs to enter the main line from the depot branch line, the switching station 3 closes its sectional feeder circuit breaker 32 and disconnecting switch, connecting the main line contact network 4 and the branch line contact network 5. At this time, the electrical energy output from the first substation 1 flows through the main line contact network 4 and the switching station 3 to the branch line contact network 5, providing traction power for the train on the branch line. Under this power supply condition, the train can directly enter the main line without any power outage.

[0031] Figure 2 This is a schematic diagram of the mainline maintenance status of the power supply system for uninterrupted train operation and maintenance, as shown in some embodiments of this specification. (Refer to...) Figure 2As shown, when the train returns to the branch line of the depot for maintenance, switch station 3 disconnects the connection between the main line contact network 4 and the branch line contact network 5. At this time, the branch line contact network 5 is independently powered by the second substation 2, while the main line contact network 4 is completely electrically isolated from the branch line contact network 5. When the train is carrying out maintenance work on the branch line contact network 5, the main line contact network 4 can safely enter a power outage maintenance state, while the branch line contact network 5 continues to be powered, ensuring the power supply for the train under maintenance.

[0032] In this way, by controlling the on / off state of switch station 3, the system constructs a dynamically adjustable power supply topology in space: when switch station 3 is on, the main line contact network 4 and the branch line contact network 5 are integrated into a unified power supply network; when switch station 3 is off, the two become electrically isolated independent power supply systems. This flexible power supply mode eliminates the traditional phase-separated power outage zone, enabling trains to travel energized throughout the entire route between the main line and the depot branch line.

[0033] In this embodiment, the electrical shunt 31 is connected in series with the branch line contact network 5 to form a physical isolation point, while the shunt feeder circuit breaker 32 is connected in parallel across the two ends of the electrical shunt 31. When the shunt feeder circuit breaker 32 is closed, the current directly bypasses the shunt feeder circuit breaker 32, thus bypassing the electrical shunt 31. At this time, the branch line contact network 5 is electrically connected at the location of the electrical shunt 31. When the shunt feeder circuit breaker 32 is opened, the isolation function of the electrical shunt 31 over the branch line contact network 5 is restored. This design allows for rapid switching between the "connected / isolated" states of the branch line contact network 5 and the main line contact network 4 through the operation of a single device, eliminating the need for power outages when trains pass through the electrical shunt 31. It also preserves the physical isolation capability of the electrical shunt 31 over its two power supply zones, providing a foundation for subsequent maintenance. This eliminates the impact of traditional power outage zones on train operation while maintaining the manageability of the power supply zones, significantly reducing system complexity and failure risks.

[0034] In this embodiment, the switch station 3 further includes a disconnecting switch 33, which is connected in series with the sectional feeder circuit breaker 32 and then in parallel with the electrical section 31. The sectional feeder circuit breaker 32 performs the main function of switching current, while the disconnecting switch 33 provides a visible physical break point after its tripping. When conduction is required, the disconnecting switch 33 is closed first, followed by the sectional feeder circuit breaker 32, allowing current to bypass the electrical section 31 via the parallel branch. When isolation is required, the sectional feeder circuit breaker 32 is tripped first, followed by the disconnecting switch 33, forming two breaks. The introduction of the disconnecting switch 33 ensures a definite power-off state during maintenance of the electrical section 31 equipment, avoiding the risk of residual charge or misoperation. Through the coordinated operation of mechanical isolation and electrical disconnection, the system's operational safety and maintenance convenience are significantly improved while maintaining uninterrupted power supply, especially ensuring personnel safety during maintenance windows.

[0035] In this embodiment, the switch station 3 further includes a segmented busbar 34, which is connected in parallel to both ends of the electrical section 31. One end of the segmented feeder circuit breaker 32 is connected to the segmented busbar 34, and the other end is connected to the branch contact network 5 near the main contact network 4 of the electrical section 31. For example, the segmented busbar 34 serves as a current collection point, enabling the segmented feeder circuit breaker 32 to achieve a parallel connection with the electrical section 31 by connecting to the segmented busbar 34. When the segmented feeder circuit breaker 32 is closed, the current flows directly from the branch contact network 5 across the segmented busbar 34 to the two ends of the electrical section 31, forming a bypass and creating a closed path of "branch contact network 5—disconnecting switch 33—segmented busbar 34—segmented feeder circuit breaker 32—branch contact network 5".

[0036] As a feasible implementation, the disconnector 33 can also be connected in series with the sectional feeder circuit breaker 32, with its connection point extending to the sectional busbar 34 (not shown in the figure). For example, one end of the disconnector 33 is fixedly connected to the busbar, and the other end is connected to the sectional feeder circuit breaker 32, forming a closed circuit of "branch contact network 5—sectional busbar 34—disconnector 33—sectional feeder circuit breaker 32—branch contact network 5".

[0037] In this embodiment of the application, for the first substation 1, the first main transformer 11 steps down the high voltage of the power grid to the traction voltage and outputs it to the first traction bus 12; the first feeder circuit breaker 13 acts as a controllable switch, connecting or disconnecting the connection between the first traction bus 12 and the main line contact network 4 according to operational requirements (such as departure / receipt instructions), thereby controlling the energized state of the main line contact network 4.

[0038] In this way, the opening and closing operations of the first feeder circuit breaker 13 and the second feeder circuit breaker 23 enable rapid switching between the main line contact network 4 and the branch line contact network 5. This supports cross-regional power supply from the first substation 1 when the switching station 3 is on (during the departure phase), and also allows the local second substation 2 to take over after the switching station 3 is off, safely isolating the main line contact network 4 (during the return and maintenance phase). This master-slave switching mechanism satisfies the need for uninterrupted train operation while ensuring the autonomy of branch line power supply during depot maintenance.

[0039] Example 2 Based on the foregoing embodiments, combined with Figures 1-2 This embodiment provides a method for uninterrupted power supply to trains between main lines and branch lines, applied to the aforementioned uninterrupted power supply system. The power supply method of this embodiment includes the following: When the trains are in the off-line state, after all the running trains have entered the branch line, the isolating switch 33 and the section feeder circuit breaker 32 of the control switch station 3 are opened, the second feeder circuit breaker 23 of the first substation 1 is opened, and the feeder circuit breaker of the second substation 2 is closed, so that the trains on the branch line contact network 5 are powered by the second substation 2 and the trains are inspected, and the main line contact network 4 enters the maintenance window; the maintenance window is the operation state of power outage for maintenance within a predetermined time period; When the train is in the departure state, the second feeder circuit breaker 23 of the second substation 2 is opened, the isolating switch 33 and the sectional feeder circuit breaker 32 of the switching station 3 are closed, and the first feeder circuit breaker 13 of the first substation 1 is closed, so that the train on the branch line contact network 5 is powered by the first substation 1, and the train enters the main line contact network 4 from the branch line contact network 5 without interrupting power.

[0040] The uninterrupted power supply method for trains between main lines and branch lines provided in this embodiment achieves uninterrupted power switching between main lines and branch lines by coordinating the opening and closing timing of the second feeder circuit breaker 23, the sectional feeder circuit breaker 32 and the first feeder circuit breaker 13.

[0041] It should be noted that in this embodiment, the opening and closing of the switch station is uniformly controlled and managed through the power supply system monitoring system (i.e., data acquisition and monitoring control system; SCADA, Supervisory Control and Data Acquisition).

[0042] In this embodiment, during the departure phase, the second feeder circuit breaker 23 of the second substation 2 is first tripped to cut off the local power supply from the second substation 2 to the branch line contact network 5. Then, the sectional feeder circuit breaker 32 of the switching station 3 is closed, allowing the electrical sectionalizing section 31 to be bypassed. Simultaneously, the first feeder circuit breaker 13 of the first substation 1 is closed. At this time, the electrical energy output from the first substation 1 forms a power supply path via the main line contact network 4 → switching station 3 → branch line contact network 5. Trains on the branch line contact network 5 operate continuously energized under this power supply path, seamlessly entering the coverage area of ​​the main line contact network 4.

[0043] During the return phase, after the train has returned and fully entered the branch line contact network 5, the section feeder circuit breaker 32 is first opened to restore the isolation function of the electrical section 31 between the main line contact network 4 and the branch line contact network 5. Then, the first feeder circuit breaker 13 of the first substation 1 is opened to completely de-energize the main line contact network 4. Simultaneously, the second feeder circuit breaker 23 of the second substation 2 is closed to switch the branch line contact network 5 to independent power supply from the second substation 2. At this time, the trains on the branch line contact network 5 are directly powered by the second substation 2, maintaining continuous power supply during maintenance. Meanwhile, the main line contact network 4, due to the power outage, enters the maintenance window state, forming electrical isolation from the energized branch line contact network 5.

[0044] Figure 3 This is a schematic diagram of the power supply system status when the first substation is disconnected, according to some embodiments of this specification. In the embodiments of this application, refer to... Figure 3 As shown, when the first substation 1 experiences an anomaly and is forced to shut down, the second feeder circuit breaker 23 of the second substation 2 is closed, and the isolating switch 33 and the sectional feeder circuit breaker 32 of the switching station 3 are also closed, enabling the second substation 2 to supply power to the main line contact network 4. When the first substation 1 is forced to shut down for any reason (such as equipment failure or planned maintenance), the second substation 2 is controlled to supply power to the main line contact network 4 to maintain train operation. By controlling the second feeder circuit breaker 23, the sectional feeder circuit breaker 32, and the isolating switch 33 to close, the branch contact network 5 and the main line contact network 4 are connected, allowing the current output from the second substation 2 to be transmitted to the main line via the branch contact network 5—switching station 3—maintaining the main line contact network 4, thus replacing the original function of the first substation 1.

[0045] As a feasible implementation method, when the second substation 2 experiences an anomaly leading to its shutdown, the status of the power supply system and Figure 1 Similarly, the system controls the first feeder circuit breaker 13 of substation 1 to close, and controls the disconnecting switch 33 and the sectional feeder circuit breaker 32 of switch station 3 to be in the closed state, enabling substation 1 to provide power to the branch contact network 5. In the scenario where substation 2 is out of service, the system controls substation 1 to provide power to the branch contact network 5. The system controls the first feeder circuit breaker 13 of substation 1 to close, and the sectional feeder circuit breaker 32 and the disconnecting switch 33 to close, allowing the current output from substation 1 to extend to the depot area via the main contact network 4, switch station 3, and branch contact network 5.

[0046] The uninterrupted power supply method for trains operating between main lines and branch lines provided in this embodiment achieves this through coordinated control of the switching station and the feeder circuit breakers of the two substations. This ensures that the trains do not experience power outages during the entire departure / return process: when departing, the branch line train enters the main line energized; when returning, the main line enters maintenance while the branch line train maintains power supply for maintenance, significantly improving transportation efficiency. Simultaneously, by having the second substation support the main line when the first substation fails, and the first substation support the branch line when the second substation fails, the other substation can seamlessly take over power supply when one substation is out of service, forming a redundancy backup mechanism and significantly improving the overall system reliability.

[0047] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a portion of a module, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0048] It should be noted that although several modules or units of the device for performing actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0049] In the several embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.

[0050] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. A train uninterruptible power supply system applied between a main line and a branch line, characterized in that, include: The first substation is connected to the main line contact network; The second substation is connected to the branch contact network; The switching station is located on the branch contact network and on the side of the second substation closer to the main contact network. The switching station includes an electrical section, a section feeder circuit breaker, and a disconnecting switch. The electrical section is connected in series on the branch contact network, and the section feeder circuit breaker is connected in parallel at both ends of the electrical section. The disconnecting switch is connected in series with the section feeder circuit breaker and then connected in parallel with the electrical section.

2. The uninterruptible power supply system for trains applied between main lines and branch lines according to claim 1, characterized in that, The switch station also includes segmented busbars, which are connected in parallel to both ends of the electrical segment; Wherein, one end of the segmented feeder circuit breaker is connected to the segmented busbar, and the other end of the segmented feeder circuit breaker is connected to the branch contact network of the electrical segment near the main contact network; one end of the disconnecting switch is connected to the segmented busbar, and the other end of the disconnecting switch is connected to the branch contact network of the electrical segment away from the main contact network.

3. The uninterruptible power supply system for trains applied between main lines and branch lines according to claim 1, characterized in that, The switch station also includes segmented busbars, which are connected in parallel to both ends of the electrical segment; Wherein, one end of the segmented feeder circuit breaker is connected to the segmented busbar, and the other end of the segmented feeder circuit breaker is connected to the branch contact network of the electrical segment near the main contact network side; one end of the disconnecting switch is connected to the segmented busbar, and the other end of the disconnecting switch is connected to the segmented feeder circuit breaker.

4. The uninterruptible power supply system for trains applied between main lines and branch lines according to any one of claims 1-3, characterized in that, The first substation includes a first main transformer, a first traction busbar, and a first feeder circuit breaker connected in sequence, with the first feeder circuit breaker connected to the main contact network; The second substation includes a second main transformer, a second traction busbar, and a second feeder circuit breaker connected in sequence, with the second feeder circuit breaker connected to the branch contact network.

5. A method for uninterrupted power supply to trains between a main line and a branch line, applied to the uninterrupted power supply system of claim 1, characterized in that, include: When the trains are in the off-line state, after all the running trains have entered the branch line, the first feeder circuit breaker of the first substation is opened, the section feeder circuit breaker of the switching station is opened, and the second feeder circuit breaker of the second substation is closed, so that the trains on the branch line contact network are powered by the second substation for maintenance, and the main line contact network enters the maintenance window. When the train is in the departure state, the second feeder circuit breaker is controlled to open, the section feeder circuit breaker of the switching station is controlled to close, and the first feeder circuit breaker is controlled to close, so that the train on the branch line contact network is powered by the first substation, so that the train can enter the main line contact network from the branch line contact network without interrupting power supply. The switch station includes an electrical substation, a disconnecting switch, and the substation feeder circuit breaker. The electrical substation is connected in series on the branch contact wire. The disconnecting switch and the substation feeder circuit breaker are connected in series and then connected in parallel at both ends of the electrical substation. When isolation is required during vehicle retrieval, first control the circuit breaker of the segmented feeder to open, and then control the disconnecting switch to open. When the train needs to be connected, first control the disconnect switch to close, and then control the section feeder circuit breaker to close, so that the electrical section is bypassed.

6. The method for uninterrupted power supply to trains between main lines and branch lines according to claim 5, characterized in that, Also includes: In the event of an abnormality at the first substation causing it to shut down, the second feeder circuit breaker is controlled to close, and the disconnecting switch and the sectional feeder circuit breaker are controlled to be in the closed state, so that the second substation can provide power support to the main contact network.

7. The method for uninterrupted power supply to trains between main lines and branch lines according to claim 6, characterized in that, Also includes: In the event of an anomaly at the second substation causing it to shut down, the first feeder circuit breaker is controlled to close, and the disconnecting switch and the sectional feeder circuit breaker are controlled to be in the closed state, so that the first substation can provide power support to the branch contact network.

8. The method for uninterrupted power supply to trains between main lines and branch lines according to claim 5, characterized in that, Both the first substation and the second substation use single-sided power supply.

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