Networked support power supply method and system of urban rail power supply system

Abstract

The invention relates to the technical field of traction power supply, in particular to a networked support power supply method and system for an urban rail power supply system, and the method comprises the steps: firstly obtaining the information of the urban rail power supply system and an urban rail line in a designated range, and constructing an urban rail topology model; the urban rail topology model is input into a preset simulator for a first simulation experiment, and the reserve capacity of each switching station in the normal operation state is obtained; the urban rail topology model is input into a preset simulator for a second simulation experiment, and operation parameters of the urban rail power supply system when different to-be-selected schemes are adopted under the condition that the designated switching station breaks down are obtained; and judging whether each candidate scheme meets a preset constraint condition, for each candidate scheme meeting the preset constraint condition, respectively calculating the number of kiosk covered by the power supply area corresponding to the adjacent switching station for supporting power supply, and selecting the candidate scheme with the minimum number of kiosk as the optimal supporting power supply scheme. The feasibility and the effect of the method are better.

Description

Technical Field

[0001] The present invention relates to the technical field of traction power supply, and in particular to a networked support power supply method and system for an urban rail power supply system. Background Art

[0002] In recent years, with the acceleration of urbanization, urban rail transit systems have flourished, the number of transfer stations has increased day by day, the scale of the line network has continued to expand, and network operation has become an inevitable trend. However, in this process, the power supply system, as the lifeblood of rail transit, faces severe challenges. Although the urban rail network is becoming increasingly large and has the significant characteristics of network operation, at the power supply system level, most of them still adopt the traditional mode of mutual support within a single line. This mode has great limitations in resource utilization and has caused waste of power supply system resources. Beijing Metro is one example.

[0003] In the face of the above problems, academia and industry have begun to explore effective ways to share network resources in power supply systems. However, despite many studies and practices, how to achieve true network support in power supply systems is still a key technical problem that needs to be solved urgently. Especially when urban rail transit systems encounter faults, how to use external power supplies from adjacent lines for support power supply, and how to optimize power supply partitions and reduce voltage losses under constraints such as the spare capacity of the switch station, the maximum current carrying capacity of the medium-voltage cable, and the bus voltage of the substation, these are technical obstacles that must be overcome. In addition, it is necessary to conduct an in-depth analysis of the feasibility and necessity of networked support power supply under different fault conditions, so as to provide a solid theoretical basis and technical guidance for the formulation of networked support power supply strategies for power supply systems.

[0004] In summary, although the current research and practice of network-based support power supply strategies for power supply systems has made some progress, there are still many challenges. How to maximize the flexibility and reliability of power supply and achieve optimal allocation of resources while ensuring the safe and stable operation of the power supply system is an important direction for the development of future urban rail transit power supply systems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a networked support power supply method and system for an urban rail power supply system.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, an embodiment of the present invention provides a networked support power supply method for an urban rail power supply system, wherein the switchgears with faults in the method are all located in an urban rail transfer station, and there are two switchgears in the urban rail transfer station, and the two switchgears are located on different urban rail lines, respectively. The method comprises:

[0010] S10, obtaining information about the urban rail power supply system and urban rail lines within a specified range, and constructing an urban rail topology model according to the information;

[0011] S20, inputting the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtaining the spare capacity of each switch station of the urban rail power supply system under normal operating conditions;

[0012] S30, inputting the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtaining operating parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch;

[0013] Among them, different options are to use any adjacent switchgear for supporting power supply, wherein the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs;

[0014] S40. Determine whether each candidate plan meets the preset constraints based on the backup capacity and the operating parameters. For each candidate plan that meets the preset constraints, calculate the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply, and select the candidate plan with the least number of booths as the optimal supporting power supply plan.

[0015] Optionally, the S10 includes:

[0016] S11. Obtain information on the urban rail power supply system and urban rail lines within a specified range;

[0017] S12, obtaining the access point and protocol capacity of the external power supply, as well as the voltage range of the medium-voltage busbar of the urban rail power supply system and the maximum allowable current carrying capacity of the interconnection ring network cable;

[0018] S13, determine the division of power supply zones of the urban rail power supply system under normal operating conditions, and record the power supply range and terminal voltage loss of each power supply zone;

[0019] S14. Based on the information in S11-S13, construct an urban rail topology model.

[0020] Optionally, the urban rail topology model indicates the relationship between each substation, switch station, cross-line ring network connection switch, urban rail line and power supply partition.

[0021] Optionally, the S11 includes:

[0022] S111. Obtaining detailed information of urban rail lines and transfer stations within a specified range, including the direction of the lines, the geographical locations of the stations, and the layout and connection methods of the transfer stations;

[0023] S112. Acquire facility information within the urban rail power supply system, including the location, type, capacity, connection method of substations and switchgear, and the status of interconnection switches between lines.

[0024] Optionally, the S20 includes:

[0025] S21, importing the urban rail topology model constructed in S10 into a preset simulation simulator;

[0026] S22. In the simulation simulator, after setting the normal operating conditions, start the simulation to simulate the working state of the urban rail power supply system during normal operation, and obtain the load distribution of each switch under the normal operation of the urban rail power supply system and the load conditions of the two incoming lines of each switch;

[0027] S23. According to the load distribution and load conditions, the spare capacity of each switch under normal operation of the urban rail power supply system is calculated, that is, the unused power of the switch.

[0028] Optionally, the S30 includes:

[0029] S31, importing the urban rail topology model constructed in S10 into a preset simulation simulator, setting the fault conditions, i.e., specifying the switch S i It is in the disconnected maintenance state and cannot supply power normally;

[0030] S32, simulating three different candidate solutions, and obtaining operating parameters of each candidate solution respectively;

[0031] The three options are:

[0032] Use switch i Adjacent switchgear station S on the urban rail line i-1 To provide support power, close S i and S i-1 The ring network connection switch between them allows S i-1 Support original S i Power supply interval;

[0033] Use switch i Another adjacent switchgear station S on the urban rail line i+1 To provide support power, close S i and S i+1 The ring network connection switch between them allows Si+1 Support original S i Power supply interval;

[0034] Use switch i Another switch station S' in the transfer station i To provide support power, close S i and S' i The cross-line ring network contact switch between them allows S' i Support original S i power supply range.

[0035] Optionally, the S40 includes:

[0036] S41, judging whether each candidate solution satisfies preset constraint conditions by using a preset formula according to the spare capacity and the operating parameters;

[0037] The preset formula is:

[0038]

[0039] Among them, U T The terminal network voltage of the power supply partition during the backup power supply, U Tmin and U Tmax are the preset minimum and maximum allowable voltage values, S i-1 For opening and closing i-1 The spare capacity, S i+1 For opening and closing i+1 The spare capacity, S' i For opening and closing i The spare capacity SΔ is the capacity to support the original S i The capacity required for the power supply section, Q is the current carrying capacity of the interconnection ring network cable when supporting power supply, Q max The maximum allowable current carrying capacity of the interconnection ring network cable;

[0040] S42. For each candidate solution that meets the preset constraint conditions, the number of kiosks covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of kiosks is selected as the optimal supporting power supply solution.

[0041] Optionally, the S40 further includes:

[0042] S43. Establish an emergency response plan library to store a variety of preset support power supply plans for different types of faults and operating conditions.

[0043] Optionally, the number of kiosks covered by the power supply area corresponding to the adjacent switchgear providing supporting power supply does not exceed 5.

[0044] In a second aspect, an embodiment of the present invention provides a networked support power supply system for an urban rail power supply system, which is used to implement the networked support power supply method for the urban rail power supply system described in the first aspect, including:

[0045] A topology model building module is used to obtain information about the urban rail power supply system and urban rail lines within a specified range, and build an urban rail topology model based on the information;

[0046] The spare capacity acquisition module inputs the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtains the spare capacity of each switch station of the urban rail power supply system under normal operating conditions;

[0047] An operation parameter acquisition module is used to input the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtain the operation parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch station;

[0048] Among them, different options are to use any adjacent switchgear for supporting power supply, wherein the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs;

[0049] The optimal solution selection module is used to determine whether each candidate solution meets the preset constraints based on the spare capacity and the operating parameters. For each candidate solution that meets the preset constraints, the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of booths is selected as the optimal supporting power supply solution.

[0050] (III) Beneficial effects

[0051] The networked support power supply method and system of the urban rail power supply system of the present invention, by constructing a topological model of the urban rail power supply system and using simulation technology, can accurately evaluate the spare capacity of the urban rail power supply system under normal operation, and the feasibility and effect of using adjacent switchgears for support power supply when a specific switchgear fails. This method greatly improves the resource utilization rate of the power supply system, reduces resource waste, and realizes the optimal configuration of power supply system resources under the background of networked operation;

[0052] By simulating the support power supply schemes under different fault scenarios, the optimal support power supply scheme can be quickly determined under the constraints of the switchgear spare capacity, the maximum current carrying capacity of the medium-voltage cable and the bus voltage of the substation. This instant response capability ensures that power supply can be restored quickly and effectively when a fault occurs, reducing the impact on urban rail transit operations and improving the flexibility and reliability of the power supply system.

[0053] By calculating the number of booths covered by the power supply area corresponding to the adjacent switchgear supporting power supply, the solution with the least number of booths is selected as the optimal supporting power supply solution. This strategy not only reduces voltage loss and improves power supply quality, but also optimizes the layout of power supply partitions, making the power supply system more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of a flow chart of a network-based power supply method for a city rail power supply system in Embodiment 1 of the present invention;

[0055] Figure 2 Schematic diagram of the urban rail topology model in the second embodiment of the present invention;

[0056] Figure 3 It is a structural schematic diagram of the networked support power supply system of the urban rail power supply system in the third embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0058] Embodiment 1

[0059] like Figure 1 As shown, this embodiment provides a networked support power supply method for a city rail power supply system. The switchgears with faults in the method are all located in a city rail transfer station, and there are two switchgears in the city rail transfer station, and the two switchgears are located on different city rail lines. The method may include:

[0060] S10, obtaining information on the urban rail power supply system and urban rail lines within a specified range, and constructing an urban rail topology model based on the information.

[0061] Specifically, obtain detailed information about urban rail lines and transfer stations within a specified range, including the direction of the lines, the geographical location of the stations, and the layout and connection methods of the transfer stations;

[0062] Obtain facility information within the urban rail power supply system, including the location, type, capacity, connection method of substations and switchgear, and the status of interconnection switches between lines;

[0063] Obtain the access point and protocol capacity of the external power supply, as well as the voltage range of the medium-voltage busbar of the urban rail power supply system and the maximum allowable current carrying capacity of the interconnection ring network cable;

[0064] Determine the division of power supply zones of the urban rail power supply system under normal operating conditions, and record the power supply range and terminal voltage loss of each power supply zone;

[0065] Based on the above-obtained and determined information, a topological model of the urban rail transit is constructed.

[0066] The urban rail topology model shows the relationship between substations, switchgear, cross-line ring network interconnection switches, urban rail lines and power supply partitions.

[0067] S20, inputting the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtaining the spare capacity of each switchgear station of the urban rail power supply system under normal operating conditions.

[0068] Specifically, the urban rail topology model constructed in S10 is imported into a preset simulation simulator;

[0069] In the simulation simulator, after setting the normal operating conditions, start the simulation to simulate the working state of the urban rail power supply system during normal operation, and obtain the load distribution of each switch station under the normal operation of the urban rail power supply system and the load conditions of the two incoming lines of each switch station;

[0070] According to the load distribution and load conditions, the spare capacity of each switch under normal operation of the urban rail power supply system is calculated, that is, the portion of electricity not used by the switch.

[0071] S30, inputting the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtaining operating parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch.

[0072] Among them, different options are to use any adjacent switchgear for supporting power supply, and the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs.

[0073] Specifically, the urban rail topology model is imported into a preset simulation simulator, and the fault conditions are set, that is, the switch S is specified. i It is in the disconnected maintenance state and cannot supply power normally;

[0074] Simulate three different candidate solutions and obtain the operating parameters of each candidate solution;

[0075] Among them, the three options are:

[0076] Use switch i Adjacent switchgear station S on the urban rail line i-1 To provide support power, close S i and S i-1 The ring network connection switch between them allows S i-1 Support original S i Power supply interval;

[0077] Use switchi Another adjacent switchgear station S on the urban rail line i+1 To provide support power, close S i and S i+1 The ring network connection switch between them allows S i+1 Support original S i Power supply interval;

[0078] Use switch i Another switch station S' in the transfer station i To provide support power, close S i and S' i The cross-line ring network contact switch between them allows S' i Support original S i power supply range.

[0079] S40. Determine whether each candidate plan meets the preset constraints based on the backup capacity and the operating parameters. For each candidate plan that meets the preset constraints, calculate the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply, and select the candidate plan with the least number of booths as the optimal supporting power supply plan.

[0080] Specifically, according to the spare capacity and the operating parameters, a preset formula is used to determine whether each candidate solution meets the preset constraint condition;

[0081] The preset formula is:

[0082]

[0083] Among them, U T The terminal network voltage of the power supply partition during the backup power supply, U Tmin and U Tmax are the preset minimum and maximum allowable voltage values, S i-1 For opening and closing i-1 The spare capacity, S i+1 For opening and closing i+1 The spare capacity, S' i For opening and closing i The spare capacity SΔ is the capacity to support the original S i The capacity required for the power supply section, Q is the current carrying capacity of the interconnection ring network cable when supporting power supply, Q max The maximum allowable current carrying capacity of the interconnection ring network cable;

[0084] For each candidate solution that meets the preset constraints, the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of booths is selected as the optimal supporting power supply solution.

[0085] Among them, the number of booths covered by the power supply area corresponding to the adjacent switchgear providing supporting power supply shall not exceed 5.

[0086] Optionally, establish an emergency response plan library to plan multiple support power supply plans in advance for unforeseen events such as extreme weather and natural disasters to ensure the continuity and stability of the urban rail power supply system;

[0087] Through the real-time communication system, information is exchanged with the power supply systems of adjacent urban rail lines to achieve cross-line resource coordination and sharing, further enhancing the network support power supply capabilities.

[0088] Preferably, a closed-loop feedback mechanism is implemented to feed back the actual effect of the power supply support plan to the simulation simulator, continuously improve the prediction accuracy of the simulation simulator, and enhance the intelligent management level of the urban rail power supply system.

[0089] The networked support power supply method for the urban rail power supply system provided in this embodiment has the following significant beneficial effects:

[0090] Improve power supply reliability and continuity: By constructing a detailed urban rail topology model and conducting multi-scenario simulations, this method can predict and evaluate in advance the response of the power supply system when a failure occurs in a specific switchgear, thereby quickly determining the optimal support power supply plan, effectively ensuring the continuity and reliability of urban rail power supply, and reducing the operational impact caused by power outages.

[0091] Optimize resource scheduling and utilization efficiency: Use simulation simulators to conduct in-depth analysis of different options, and accurately calculate the operating parameters of each option, including key indicators such as backup capacity and the number of kiosks covered by the power supply area, so as to select the most economical and efficient support power supply plan, avoid waste of resources, and improve the utilization efficiency of the overall power supply network.

[0092] Strengthen emergency response capabilities: This embodiment not only focuses on conventional fault scenarios, but also establishes an emergency response plan library to pre-plan a variety of support power supply solutions for unforeseen events such as extreme weather and natural disasters, greatly enhancing the response speed and processing capabilities of the urban rail power supply system in the face of emergencies.

[0093] Promoting cross-line resource sharing: By exchanging information with the power supply systems of adjacent urban rail lines through a real-time communication system, cross-line resource coordination and sharing are achieved, the networked support power supply capability is enhanced, and a more flexible and coordinated urban rail power supply network is built.

[0094] Closed-loop feedback mechanism improves intelligent management: A closed-loop feedback mechanism is implemented to feed back the actual effects of the power supply support plan to the simulation simulator, continuously improve the prediction accuracy of the simulation simulator, and make the management of the urban rail power supply system more intelligent and refined, which will help optimize the power supply strategy and improve service quality in the long term.

[0095] Reduce operational risks and costs: Through the scientific and reasonable selection of support power supply solutions, the operational risks and maintenance costs caused by power supply failures can be effectively reduced, while reducing the impact on passenger travel and improving the overall operational efficiency and economic benefits of urban rail transit.

[0096] Embodiment 2

[0097] For a more convenient and intuitive understanding, this embodiment provides a specific case, such as Figure 2 As shown in the figure, in a certain city's subway network, it is assumed that Line 1 and Line 2 intersect at a certain transfer station. There are two switch stations in the transfer station, serving the two lines respectively. Considering that a switch station S i The equipment is temporarily out of service due to equipment failure. This embodiment aims to use the network support power supply method to utilize other adjacent switchgears on Line 1. i-1 , S i+1 , or the switch station S' of Line 2 i Provide temporary power supply support to ensure normal operation of the subway.

[0098] Under normal operation, the power supply partitions are divided as follows: Figure 2 The agreed capacity of all external power supplies is 12MVA. Tmin 1000V, U Tmax The maximum allowable current carrying capacity of the interconnection ring network cable is 448A. The non-switch station in the figure is a transformer station.

[0099] S i-1 , S i+1 , S' i The three switchgear stations support S i The operation mode is:

[0100] (1) Use the main line to support and close S i and S i-1 The ring network contact switch between the original S i The power supply interval is composed of S i-1 Support, at this time S i-1 The power supply range is S i , a, b, S i-1 There are 4 pavilions in total;

[0101] (2) Use the support of the main line to close S i and S i+1The ring network contact switch between the original S i The power supply interval is composed of S i+1 Support, at this time S i+1 The power supply range is a, S i ,c,S i+1 , d There are 5 pavilions in total;

[0102] (3) Use the support of adjacent lines to close S i and S' i The ring network contact switch between the original S i The power supply interval is S' i Support, at this time S' i The power supply range is S i , S' i There are 4 pavilions in total, namely a, f.

[0103] Among them, the substation refers to the switchgear and non-switchgear (transformer substation) in the urban rail.

[0104] Combined with the simulation results of the simulated fault conditions, the constraint results are shown in the following table:

[0105]

[0106] According to the above analysis, it can be seen that among the three support plans, the use of S i+1 and S' i The support power supply provided by the switch can meet the support constraints, and S i-1 The power supply scheme is due to the fact that the network voltage at the end of the power supply partition is lower than the specified U Tmin Therefore, S i+1 and S' i Support becomes a viable support power supply option.

[0107] For the above two feasible solutions, considering the problem of power supply stability, the solution with the least number of kiosks covered by the power supply area is selected as the optimal support power supply solution, and S is closed. i and S' i The cross-line ring network contact switch between the adjacent lines S' i For S i Temporary power supply is provided to the original power supply section. After the fault is restored / maintenance is completed, the ring network interconnection switch is disconnected and the power supply mode is switched back to the original power supply section.

[0108] Embodiment 3

[0109] like Figure 3 As shown, this embodiment provides a networked support power supply system for a city rail power supply system, which is used to implement the networked support power supply method for a city rail power supply system described in Embodiment 1, and may include:

[0110] A topology model building module is used to obtain information about the urban rail power supply system and urban rail lines within a specified range, and build an urban rail topology model based on the information;

[0111] The spare capacity acquisition module inputs the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtains the spare capacity of each switch station of the urban rail power supply system under normal operating conditions;

[0112] An operation parameter acquisition module is used to input the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtain the operation parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch station;

[0113] Among them, different options are to use any adjacent switchgear for supporting power supply, wherein the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs;

[0114] The optimal solution selection module is used to determine whether each candidate solution meets the preset constraints based on the spare capacity and the operating parameters. For each candidate solution that meets the preset constraints, the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of booths is selected as the optimal supporting power supply solution.

[0115] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0116] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0117] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0118] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0119] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A network-based supporting power supply method for an urban rail power supply system, characterized in that: The switchgears with faults in the method are all located in the urban rail transfer station, and there are two switchgears in the urban rail transfer station, and the two switchgears are located on different urban rail lines. The method includes: S10, obtaining information about the urban rail power supply system and urban rail lines within a specified range, and constructing an urban rail topology model according to the information; S20, inputting the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtaining the spare capacity of each switch station of the urban rail power supply system under normal operating conditions; S30, inputting the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtaining operating parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch; Among them, different options are to use any adjacent switchgear for supporting power supply, wherein the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs; S40. Determine whether each candidate plan meets the preset constraints based on the backup capacity and the operating parameters. For each candidate plan that meets the preset constraints, calculate the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply, and select the candidate plan with the least number of booths as the optimal supporting power supply plan.

2. The network-based supporting power supply method for the urban rail power supply system according to claim 1, characterized in that: The S10 includes: S11. Obtain information on the urban rail power supply system and urban rail lines within a specified range; S12, obtaining the access point and protocol capacity of the external power supply, as well as the voltage range of the medium-voltage busbar of the urban rail power supply system and the maximum allowable current carrying capacity of the interconnection ring network cable; S13, determine the division of power supply zones of the urban rail power supply system under normal operating conditions, and record the power supply range and terminal voltage loss of each power supply zone; S14. Based on the information in S11-S13, construct an urban rail topology model.

3. The network-based supporting power supply method for the urban rail power supply system according to claim 2, characterized in that: The urban rail topology model shows the relationship between substations, switchgear, cross-line ring network interconnection switches, urban rail lines and power supply partitions.

4. The network-based supporting power supply method for the urban rail power supply system according to claim 2, characterized in that: The S11 includes: S111. Obtaining detailed information of urban rail lines and transfer stations within a specified range, including the direction of the lines, the geographical locations of the stations, and the layout and connection methods of the transfer stations; S112. Acquire facility information within the urban rail power supply system, including the location, type, capacity, connection method of substations and switchgear, and the status of interconnection switches between lines.

5. The network-based supporting power supply method for the urban rail power supply system according to claim 1, characterized in that: The S20 includes: S21, importing the urban rail topology model constructed in S10 into a preset simulation simulator; S22. In the simulation simulator, after setting the normal operating conditions, start the simulation to simulate the working state of the urban rail power supply system during normal operation, and obtain the load distribution of each switch under the normal operation of the urban rail power supply system and the load conditions of the two incoming lines of each switch; S23. According to the load distribution and load conditions, the spare capacity of each switch under normal operation of the urban rail power supply system is calculated, that is, the unused power of the switch.

6. The network-based supporting power supply method for the urban rail power supply system according to claim 1, characterized in that: The S30 includes: S31, importing the urban rail topology model constructed in S10 into a preset simulation simulator, setting the fault conditions, i.e., specifying the switch S i It is in the disconnected maintenance state and cannot supply power normally; S32, simulating three different candidate solutions, and obtaining operating parameters of each candidate solution respectively; The three options are: Use switch i Adjacent switchgear station S on the urban rail line i-1 To provide support power, close S i and S i-1 The ring network connection switch between them allows S i-1 Support original S i Power supply interval; Use switch S i Another adjacent switchgear station S on the urban rail line i+1 To provide support power, close S i and S i+1 The ring network connection switch between them allows S i+1 Support original S i Power supply interval; Use switch i Another switch station S' in the transfer station i To provide support power, close S i and S' i The cross-line ring network contact switch between them makes S' i Support original S i power supply range.

7. The network-based supporting power supply method for the urban rail power supply system according to claim 4, characterized in that: The S40 includes: S41, judging whether each candidate solution satisfies preset constraint conditions by using a preset formula according to the spare capacity and the operating parameters; The preset formula is: Among them, U T The terminal network voltage of the power supply partition during the backup power supply, U Tmin and U Tmax are the preset minimum and maximum allowable voltage values, S i-1 For opening and closing i-1 The spare capacity, S i+1 For opening and closing i+1 The spare capacity, S' i For opening and closing i The spare capacity SΔ is the capacity to support the original S i The capacity required for the power supply section, Q is the current carrying capacity of the interconnection ring network cable when supporting power supply, Q max The maximum allowable current carrying capacity of the interconnection ring network cable; S42. For each candidate solution that meets the preset constraint conditions, the number of kiosks covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of kiosks is selected as the optimal supporting power supply solution.

8. The network-based supporting power supply method for the urban rail power supply system according to claim 7, characterized in that: The S40 further includes: S43. Establish an emergency response plan library to store a variety of preset support power supply plans for different types of faults and operating conditions.

9. The network-based supporting power supply method for the urban rail power supply system according to claim 1, characterized in that: The number of booths covered by the power supply area corresponding to the adjacent switchgear providing supporting power supply shall not exceed 5.

10. A networked support power supply system for an urban rail power supply system, used to implement the networked support power supply method for an urban rail power supply system according to any one of claims 1 to 9, characterized in that: include: A topology model building module is used to obtain information about the urban rail power supply system and urban rail lines within a specified range, and build an urban rail topology model based on the information; The spare capacity acquisition module inputs the urban rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtains the spare capacity of each switch station of the urban rail power supply system under normal operating conditions; An operation parameter acquisition module is used to input the urban rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtain the operation parameters of the urban rail power supply system when different alternative solutions are adopted when a fault occurs in a designated switch station; Among them, different options are to use any adjacent switchgear for supporting power supply, wherein the adjacent switchgear includes two adjacent switchgears on the urban rail line to which the designated switchgear belongs and another switchgear in the transfer station to which the designated switchgear belongs; The optimal solution selection module is used to determine whether each candidate solution meets the preset constraints based on the spare capacity and the operating parameters. For each candidate solution that meets the preset constraints, the number of booths covered by the power supply area corresponding to the adjacent switchgear for supporting power supply is calculated respectively, and the candidate solution with the least number of booths is selected as the optimal supporting power supply solution.

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