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

Abstract

The present application relates to the technical field of traction power supply, and particularly relates to a networked support power supply method and system for a city rail power supply system, which first acquires information of a city rail power supply system and a city rail line within a specified range, and constructs a city rail topology model; inputs the city rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtains a backup capacity of each switching station under a normal operation state; inputs the city rail topology model into the preset simulation simulator to perform a second simulation experiment, and obtains operation parameters of the city rail power supply system when different candidate schemes are adopted respectively in the case of a fault of a specified switching station; judges whether each candidate scheme satisfies a preset constraint condition, and calculates a number of stations covered by a power supply region corresponding to an adjacent switching station for support power supply for each candidate scheme satisfying the preset constraint condition, and selects a candidate scheme with the least number of stations as an optimal support power supply scheme. The method is feasible and has better effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of traction power supply, in particular to a networked support power supply method and system for a city rail power supply system. BACKGROUND

[0002] In recent years, with the acceleration of urbanization, the city rail transit system has developed rapidly, the number of transfer stations has increased day by day, the network scale has expanded continuously, and network operation has become an inevitable trend. However, in this process, the power supply system, as the lifeblood of rail transit, is facing severe challenges. Although the city rail network is becoming larger and larger, it has the obvious characteristics of network operation, but at the power supply system level, most of them still use the traditional mode of mutual support within a single line. This mode has great limitations in resource utilization, resulting in waste of power supply system resources. Beijing subway is one of the examples.

[0003] In the face of the above problems, the academic and industrial circles have begun to explore effective ways to share network resources of the power supply system. However, despite many researches and practices, how to realize real network support in the power supply system is still a key technical problem to be solved. Especially when the city rail transit system encounters a fault, how to use the external power supply of adjacent lines for support power supply, and how to optimize the power supply partition, reduce voltage loss under the constraints of meeting the standby capacity of the substation, the maximum load flow of the medium voltage cable and the bus voltage of the transformer substation, these are all technical obstacles that must be overcome. In addition, the feasibility and necessity of network support power supply under different fault conditions need to be analyzed in depth, and a solid theoretical foundation and technical guidance should be provided for the development of power supply system network support power supply strategy.

[0004] In summary, although the current research and practice of power supply system network support power supply strategy have made some progress, there are still many challenges. How to maximize the flexibility and reliability of power supply under the premise of ensuring the safe and stable operation of the power supply system, and realize the optimal allocation of resources, is an important direction for the development of future city rail transit power supply system. SUMMARY

[0005] (I) Technical problems to be solved

[0006] In view of the above shortcomings and deficiencies of the prior art, the present application provides a networked support power supply method and system for a city rail power supply system.

[0007] (II) Technical solutions

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

[0009] In a first aspect, an embodiment of the present application provides a networked support power supply method for a city rail power supply system, wherein each open-close station subject to a fault is in a city rail interchange station, and the city rail interchange station has two open-close stations in total, and the two open-close stations are located on different city rail lines, and the method comprises:

[0010] S10, acquiring information of the city rail power supply system and the city rail lines within a specified range, and constructing a city rail topology model according to the information;

[0011] S20, inputting the city rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtaining a standby capacity of each open-close station of the city rail power supply system under a normal operation state;

[0012] S30, inputting the city rail topology model into the preset simulation simulator to perform a second simulation experiment, and obtaining operation parameters of the city rail power supply system under a condition that a specified open-close station is subject to a fault and different candidate schemes are used respectively;

[0013] wherein the different candidate schemes are to use any adjacent open-close station for support power supply, and the adjacent open-close station includes two adjacent open-close stations on a city rail line to which the specified open-close station belongs and another open-close station in the interchange station to which the specified open-close station belongs;

[0014] S40, judging whether each candidate scheme meets a preset constraint condition according to the standby capacity and the operation parameters, and calculating a number of stations covered by a power supply region corresponding to the adjacent open-close station for support power supply for each candidate scheme that meets the preset constraint condition, and selecting a candidate scheme with the least number of stations as an optimal support power supply scheme.

[0015] Optionally, the S10 comprises:

[0016] S11, acquiring information of the city rail power supply system and the city rail lines within a specified range;

[0017] S12, acquiring an access point of an external power source, a protocol capacity, a voltage range of a medium-voltage bus in the city rail power supply system, and a maximum allowable carrying capacity of a contact ring network cable;

[0018] S13, determining division of power supply partitions of the city rail power supply system under a normal operation condition, and recording a power supply range and an end voltage loss of each power supply partition;

[0019] S14, constructing the city rail topology model based on the information in S11-S13.

[0020] Optionally, the city rail topology model indicates relationships between each substation, open-close station, cross-line contact ring network contact switch, city rail line, and power supply partition.

[0021] Optionally, the S11 comprises:

[0022] S111, obtaining specific information of the urban rail line and transfer station within the specified range, including the line direction, the geographical position of the station, the layout and connection mode of the transfer station;

[0023] S112, obtaining facility information in the urban rail power supply system, including the location, type, capacity, connection mode of the transformer substation and switching station, and the state of the interconnection switch between lines.

[0024] Optionally, the S20 comprises:

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

[0026] S22, starting simulation after setting the normal operation condition in the simulation simulator, simulating the working state of the urban rail power supply system in normal operation, and obtaining the load distribution of each switching station in the normal operation of the urban rail power supply system and the load condition of each switching station two-way incoming line;

[0027] S23, calculating the standby capacity of each switching station in the normal operation of the urban rail power supply system according to the load distribution and load condition, i.e. the unused part of the power of the switching station.

[0028] Optionally, the S30 comprises:

[0029] S31, importing the urban rail topology model constructed in the S10 into a preset simulation simulator, setting a fault condition, i.e. specifying that the switching station S i is in a split maintenance condition and cannot supply power normally;

[0030] S32, simulating three different candidate schemes and obtaining the operation parameters of each candidate scheme;

[0031] The three candidate schemes are:

[0032] Using the switching station S i adjacent to the switching station S i-1 on the urban rail line to which the switching station S i belongs to support power supply, by closing the looped network interconnection switch between S i-1 and S i-1 , allowing S i-1 to support the power supply interval of the original S i ;

[0033] Using another switching station S i adjacent to the switching station S i+1 on the urban rail line to which the switching station S i belongs to support power supply, by closing the looped network interconnection switch between S i and S i+1 , allowing Si+1 Supporting original S i power supply section;

[0034] By opening and closing the S i the other switching station in the S' i support power supply, by closing the S i and S' i between the cross-line loop network contact switch, let S' i supporting the power supply section of the original S i .

[0035] Optionally, the S40 comprises:

[0036] S41, according to the standby capacity and the operating parameter, using a preset formula to determine whether each candidate scheme meets the preset constraint condition;

[0037] The preset formula is:

[0038]

[0039] Wherein, U T is the end of the power supply section when supporting power supply, U Tmin and U Tmax are the preset minimum and maximum allowable voltage values, S i-1 is the standby capacity of the opening and closing S i-1 , S i+1 is the standby capacity of the opening and closing S i+1 , S' i is the standby capacity of the opening and closing S' i , SΔ is the capacity required by the power supply section of the supporting original S i , Q is the carrying capacity of the contact loop network cable when supporting power supply, Q max is the maximum allowable carrying capacity of the contact loop network cable;

[0040] S42, for each candidate scheme meeting the preset constraint condition, the number of substations covered by the power supply area corresponding to the adjacent opening and closing of the supporting power supply is calculated, and the candidate scheme with the least number of substations is selected as the optimal supporting power supply scheme.

[0041] Optionally, the S40 further comprises:

[0042] S43, an emergency response plan library is established, and a plurality of preset supporting power supply schemes are stored for different types of faults and operating conditions.

[0043] Optionally, the number of substations covered by the power supply area corresponding to the adjacent opening and closing of the supporting power supply is not more than 5.

[0044] In a second aspect, the embodiments of the present application provide a networked support power supply system of a city rail power supply system, which is used to implement the networked support power supply method of the city rail power supply system in the first aspect, and comprises:

[0045] a topological model construction module, configured to acquire information of the city rail power supply system and the city rail line within a specified range, and construct a city rail topological model according to the information;

[0046] a backup capacity acquisition module, configured to input the city rail topological model into a preset simulation simulator to perform a first simulation experiment, and obtain backup capacities of each switching station of the city rail power supply system under a normal operation state;

[0047] an operation parameter acquisition module, configured to input the city rail topological model into the preset simulation simulator to perform a second simulation experiment, and obtain operation parameters of the city rail power supply system when different candidate schemes are used respectively under a condition that a specified switching station fails;

[0048] wherein the different candidate schemes are support power supply by using any adjacent switching station, and the adjacent switching station includes two adjacent switching stations on a city rail line to which the specified switching station belongs and another switching station in a transfer station to which the specified switching station belongs;

[0049] an optimal scheme selection module, configured to judge whether each candidate scheme meets a preset constraint condition according to the backup capacities and the operation parameters, calculate a number of stations covered by a power supply region corresponding to the adjacent switching station for support power supply for each candidate scheme meeting the preset constraint condition, and select a candidate scheme with the least number of stations as an optimal support power supply scheme.

[0050] (Three) beneficial effects

[0051] The networked support power supply method and system of the city rail power supply system can accurately evaluate backup capacities of the city rail power supply system under a normal operation state and feasibility and effects of support power supply by using adjacent switching stations when a specific switching station fails by constructing a topological model of the city rail power supply system and using simulation simulation technology, which greatly improves resource utilization of the power supply system, reduces resource waste, and realizes optimal allocation of power supply system resources under a networked operation background.

[0052] By simulating support power supply schemes under different failure scenarios, an optimal support power supply scheme can be quickly determined under the constraint conditions of backup capacities of switching stations, maximum current-carrying capacities of medium-voltage cables, and bus voltages of substations, which ensures that power supply can be quickly and effectively restored when a failure occurs, reduces the impact on city rail transportation operation, and improves flexibility and reliability of the power supply system.

[0053] By calculating the number of service stations covered by the power supply area corresponding to adjacent switches that provide power support, the scheme with the fewest service stations is selected as the optimal power support scheme. This strategy not only reduces voltage loss and improves power quality, but also optimizes the layout of power supply zones, making the power supply system more efficient. Attached Figure Description

[0054] Figure 1 This is a flowchart illustrating the networked power supply support method for urban rail power supply systems in Embodiment 1 of the present invention.

[0055] Figure 2 This is a schematic diagram of the urban rail topology model in Embodiment 2 of the present invention;

[0056] Figure 3 This is a schematic diagram of the networked support power supply system for urban rail power supply system in Embodiment 3 of the present invention. Detailed Implementation

[0057] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Example 1

[0059] like Figure 1 As shown, this embodiment provides a networked support power supply method for an urban rail power supply system. The faulty switching stations targeted in this method are all located within urban rail transfer stations, and there are two switching stations within each urban rail transfer station, located on different urban rail lines. The method may include:

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

[0061] Specifically, obtain detailed information on urban rail lines and transfer stations within a specified range, including the route 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, and connection method of substations and switching stations, as well as the status of interconnecting switches between lines;

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

[0064] Determine the division of power supply zones for 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 information obtained and determined above, an urban rail topology model was constructed.

[0066] The city rail topology model indicates the relationship between each substation, switching station, cross-line looped network contact switch, city rail line and power supply partition.

[0067] S20, input the city rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtain the standby capacity of each switching station of the city rail power supply system under normal operation.

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

[0069] In the simulation simulator, the simulation is started after setting the normal operation condition, simulating the working state of the city rail power supply system under normal operation, obtaining the load distribution of each switching station under the normal operation of the city rail power supply system and the load condition of the two incoming lines of each switching station;

[0070] According to the load distribution and load condition, the standby capacity of each switching station under the normal operation of the city rail power supply system is calculated, that is, the unused part of the electric quantity of the switching station.

[0071] S30, input the city rail topology model into a preset simulation simulator to perform a second simulation experiment, and obtain the operation parameters of the city rail power supply system under the condition that a specified switching station fails and different selected schemes are used.

[0072] The different selected schemes are to use any adjacent switching station for support power supply, and the adjacent switching stations include two adjacent switching stations on the city rail line to which the specified switching station belongs and another switching station in the transfer station to which the specified switching station belongs.

[0073] Specifically, the city rail topology model is imported into a preset simulation simulator, and a failure condition is set, that is, the specified switching station S i is in a split maintenance working condition and cannot normally supply power;

[0074] The three different selected schemes are simulated to obtain the operation parameters of each selected scheme;

[0075] The three selected schemes are as follows:

[0076] The adjacent switching station S i on the city rail line to which the switching station S i-1 belongs is used for support power supply, and the looped network contact switch between S i and S i-1 is closed to allow S i-1 to support the power supply interval of the original S i ;

[0077] The adjacent switching station Si Another adjacent switching station S on the urban rail line belongs to this line. i+1 Provide support power by closing S i and S i+1 The ring network interconnection switch between them allows S i+1 Support the original S i The power supply range;

[0078] Using switch station S i Another switching station S' within the same transfer station i Provide support power by closing S i and S' i The cross-ring network interconnection switch between them allows S' i Support the original S i The power supply range.

[0079] S40. Based on the reserve capacity and the operating parameters, determine whether each candidate scheme meets the preset constraints. For each candidate scheme that meets the preset constraints, calculate the number of service stations covered by the power supply area corresponding to the adjacent switch that provides support power supply, and select the candidate scheme with the fewest service stations as the optimal support power supply scheme.

[0080] Specifically, based on the reserve capacity and the operating parameters, a preset formula is used to determine whether each candidate scheme meets the preset constraints.

[0081] The preset formula is:

[0082]

[0083] Among them, U T To provide support for the terminal grid voltage of the power supply zone during power supply operation, U Tmin and U Tmax These are the preset minimum and maximum allowable voltage values, S i-1 For switch station S i-1 The spare capacity, S i+1 For switch station S i+1 The reserve capacity, S' i For the switchgear S' i The spare capacity, SΔ, is to support the original S i The required capacity for the power supply range, Q is the current carrying capacity of the interconnecting ring network cable when supporting power supply, Q max The maximum allowable current carrying capacity of the connecting ring network cable;

[0084] For each candidate scheme that meets the preset constraints, the number of service booths covered by the power supply area corresponding to the adjacent switches providing support power supply is calculated. The candidate scheme with the fewest service booths is selected as the optimal support power supply scheme.

[0085] Wherein, the number of substations covered by the power supply area corresponding to the adjacent open and closed station for supporting power supply does not exceed 5.

[0086] Optionally, an emergency response plan library is established, and multiple support power supply schemes are planned in advance for unpredictable 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 exchange is carried out with the power supply systems of adjacent urban rail lines, resource coordination and sharing across lines are realized, and the networked support power supply capability is further enhanced.

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

[0089] The networked support power supply method of the urban rail power supply system provided by the embodiment has the following remarkable beneficial effects:

[0090] Improve power supply reliability and continuity: By building a detailed urban rail topology model and conducting multi-scenario simulation, this method can predict and evaluate the power supply system response when a specific open and closed station fails, quickly determine the optimal support power supply scheme, effectively guarantee the continuity and reliability of urban rail power supply, and reduce the impact of power supply interruption on operation.

[0091] Optimize resource scheduling and utilization efficiency: Using the simulation simulator to analyze different selected schemes in depth, the running parameters under each scheme can be accurately calculated, including backup capacity, the number of substations covered by the power supply area, and other key indicators, so as to select the most economical and efficient support power supply scheme, avoid resource waste, and improve the utilization efficiency of the overall power supply network.

[0092] Strengthen emergency response capability: This embodiment not only focuses on regular fault scenarios, but also establishes an emergency response plan library, which plans multiple support power supply schemes in advance for unpredictable events such as extreme weather and natural disasters, greatly enhancing the response speed and processing capacity of the urban rail power supply system in the face of emergencies.

[0093] Promote cross-line resource sharing: Through the real-time communication system, information exchange is carried out with the power supply systems of adjacent urban rail lines, resource coordination and sharing across lines are realized, and the networked support power supply capability is further enhanced, building a more flexible and collaborative urban rail power supply network.

[0094] Closed-loop feedback mechanism enhances intelligent management: Implementing a closed-loop feedback mechanism feeds the actual effect of the power supply solution back to the simulation simulator, continuously improving the prediction accuracy of the simulation simulator, making the management of the urban rail power supply system more intelligent and refined, which helps to optimize power supply strategies and improve service quality in the long term.

[0095] Reduce operational risks and costs: By selecting a scientific and reasonable power supply solution, the operational risks and maintenance costs caused by power failures can be effectively reduced, while minimizing the impact on passenger travel and improving the overall operational efficiency and economic benefits of urban rail transit.

[0096] Example 2

[0097] To facilitate a more convenient and intuitive understanding, this embodiment provides a specific example, such as... Figure 2 As shown, in a city's subway network, assume that Line 1 and Line 2 intersect at a certain transfer station. This transfer station has two switching stations, each serving one of the two lines. Considering that a certain switching station S of Line 1... i Due to equipment failure, the line is temporarily out of service. This embodiment aims to utilize other adjacent switching stations S on Line 1 through a networked power supply method. i-1 S i+1 Or the switching station S' of Line 2 i Temporary power supply was provided to ensure the normal operation of the subway.

[0098] Under normal operating conditions, the power supply zones are divided as follows: Figure 2 As shown. All external power supplies have a protocol capacity of 12MVA. U Tmin For 1000V, U Tmax The voltage is 1800V. The maximum permissible current carrying capacity of the connecting ring network cable is 448A. The non-switching station in the diagram is a transformer station.

[0099] S i-1 S i+1 S' i The three switching stations respectively support S i The operating mode is as follows:

[0100] (1) Using the support of this line, close S. i and S i-1 The ring network interconnection switch between them, originally S i The power supply range is S i-1 Support, at this time S i-1 The power supply range is S of the pavilion. i a, b, S i-1 There are a total of 4 pavilions;

[0101] (2) Using the support of this line, close S. i and S i+1The ring network interconnection switch between S i The power supply range of S i+1 is the five substations S i+1 , S i , S i+1 , S i and S' i .

[0102] (3) With the support of adjacent lines, the ring network interconnection switch between S i and S' i is closed, the power supply range of S i is supported by S' i , and the power supply range of S' i is the four substations S i , S' i , S i+1 and S' i .

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

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

[0105]

[0106] According to the above analysis, it can be seen that in the three support schemes, the support power supply using S i+1 and S' i open and closed substations can meet the support constraint conditions, and the power supply scheme of S i-1 does not meet the conditions because the network voltage at the end of the power supply partition is lower than the limited U Tmin value. Therefore, using S i+1 and S' i for support becomes a feasible support power supply selection.

[0107] For the above two feasible schemes, considering the problem of power supply stability, the scheme with the least number of substations covered by the power supply area is selected as the optimal support power supply scheme, the cross-line ring network interconnection switch between S i and S' i is closed, the adjacent line S' i is used for temporary power supply for the original power supply partition of S i , and after the fault is recovered / overhauled, the ring network interconnection switch is disconnected and the original power supply partition power supply mode is switched back.

[0108] Example Three

[0109] As shown in Figure 3 , the embodiment provides a networked support power supply system of an urban rail transit power supply system, which is used to realize the networked support power supply method of the urban rail transit power supply system described in Example One, and can include:

[0110] a topological model construction module, configured to acquire information of a city rail power supply system and a city rail line within a specified range, and construct a city rail topological model according to the information;

[0111] a backup capacity acquisition module, configured to input the city rail topological model into a preset simulation simulator to perform a first simulation experiment, and obtain backup capacities of each opening and closing station of the city rail power supply system under a normal operation state;

[0112] a running parameter acquisition module, configured to input the city rail topological model into the preset simulation simulator to perform a second simulation experiment, and obtain running parameters of the city rail power supply system under a condition that a specified opening and closing station fails and different candidate schemes are adopted respectively;

[0113] wherein the different candidate schemes are to use any one of adjacent opening and closing stations for support power supply, and the adjacent opening and closing stations include two adjacent opening and closing stations on a city rail line to which the specified opening and closing station belongs and another opening and closing station in a transfer station to which the specified opening and closing station belongs;

[0114] an optimal scheme selection module, configured to judge whether each candidate scheme meets a preset constraint condition according to the backup capacities and the running parameters, calculate a number of stations covered by a power supply region corresponding to the adjacent opening and closing station for support power supply for each candidate scheme meeting the preset constraint condition, and select a candidate scheme with the least number of stations as an optimal support power supply scheme.

[0115] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0116] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0117] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature is "over", "above" and "on top of" a second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature is "under", "below" and "underneath" a second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0118] In the description of the present application, 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 connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0119] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A networked assistance power supply method for a power supply system of a city rail, characterized by, The method is characterized in that the malfunctioning switch stations are all in the urban rail transit interchange station, and the urban rail transit interchange station has two switch stations in total, and the two switch stations are located on different urban rail lines. S10, information of an urban rail power supply system and an urban rail line within a specified range is acquired, and an urban rail topology model is constructed according to the information; S20, the urban rail topology model is input into a preset simulation simulator to perform a first simulation experiment, and a standby capacity of each switch station of the urban rail power supply system under a normal operation state is obtained; Specifically, the method comprises the following steps: S21, the urban rail topology model constructed in S10 is imported into the preset simulation simulator; S22, after setting a normal operation condition in the simulation simulator, the simulation is started, the working state of the urban rail power supply system under the normal operation is simulated, and load distribution of each switch station under the normal operation of the urban rail power supply system and load conditions of two incoming lines of each switch station are obtained; S23, according to the load distribution and the load conditions, the standby capacity of each switch station under the normal operation of the urban rail power supply system, i.e., an unused power part of the switch station, is calculated; S30, the urban rail topology model is input into the preset simulation simulator to perform a second simulation experiment, and operation parameters of the urban rail power supply system under a specified switch station failure condition and under different selected schemes are obtained; The different selected schemes are support power supply by using any one of adjacent switch stations, and the adjacent switch stations include two adjacent switch stations on the urban rail line to which the specified switch station belongs and another switch station in the interchange station to which the specified switch station belongs. Specifically, the method comprises the following steps: S31, import the urban rail topology model constructed in S10 into a preset simulation simulator, set a fault condition, i.e., specify opening and closing S i under the decoupling maintenance working condition, normal power supply cannot be provided; S32, the three different selected schemes are simulated, and operation parameters of each selected scheme are obtained respectively; The three different selected schemes are as follows: Using the open-close station S i The adjacent open-close station S on the urban rail route i-1 Support power supply, by closing S i And the loop network contact switch between S i-1 Let S i-1 Support the power supply section of the original S i ​ Using switch station S i Another adjacent switching station S on the urban rail line belongs to it i+1 Provide support power by closing S i and S i+1 The ring network interconnection switch between them allows S i+1 Support the original S i The power supply range; Utilizing the open-close station S i Another open-close station S' in the transfer station of the same i Supporting power supply by closing the cross-line loop network contact switch between S i and S' i , allowing S' i to support the power supply section of the original S i ; S40, according to the standby capacity and the operation parameters, judging whether each candidate scheme meets the preset constraint condition, and for each candidate scheme meeting the preset constraint condition, respectively calculating the number of stations covered by the power supply area corresponding to the adjacent open-close station for supporting power supply, and selecting the candidate scheme with the least number of stations as the optimal supporting power supply scheme.

2. The networked booster power supply method for a city rail power supply system according to claim 1, characterized by, S10 comprises the following steps: S11, information of an urban rail power supply system and an urban rail line within a specified range is acquired; S12, an access point of an external power supply, protocol capacity, a voltage range of a medium-voltage bus in the urban rail power supply system, and a maximum allowable carrying capacity of a contact ring network cable are acquired; S13, division of power supply partitions of the urban rail power supply system under a normal operation condition is determined, and power supply ranges and end voltage loss conditions of the power supply partitions are recorded; S14, the urban rail topology model is constructed based on the information in S11-S13.

3. The networked booster power supply method for a city rail power supply system according to claim 2, characterized by, The urban rail topology model indicates relationships between each substation, switch station, cross-line contact ring network contact switch, urban rail line and power supply partition.

4. The networked booster power supply method for a city rail power supply system according to claim 2, characterized by, S11 comprises the following steps: S111, specific information of an urban rail line and interchange station within a specified range is acquired, including a line direction, a station geographical position, an interchange station layout and a connection mode; S112, facility information in the urban rail power supply system is acquired, including positions, types, capacities, connection modes of substations and switch stations, and contact switch states between lines.

5. The networked booster power supply method for a city rail power supply system according to claim 4, characterized by, S40 comprises the following steps: S41, whether each selected scheme meets a preset constraint condition is judged by using a preset formula according to the standby capacity and the operation parameters; The preset formula is as follows: ； Among them, U T To provide support for the terminal grid voltage of the power supply zone during power supply operation, U Tmin and U Tmax These are the preset minimum and maximum allowable voltage values, S i-1 For switch station S i-1 The spare capacity, S i+1 For switch station S i+1 The reserve capacity, S' i For the switchgear S' i The spare capacity, SΔ, is to support the original S i The required capacity for the power supply range, Q is the current carrying capacity of the interconnecting ring network cable when supporting power supply, Q max The maximum allowable current carrying capacity of the connecting ring network cable; S42, for each candidate scheme satisfying the preset constraint condition, the number of substations covered by the power supply area corresponding to the adjacent open-close station for supporting power supply is calculated respectively, and the candidate scheme with the least number of substations is selected as the optimal supporting power supply scheme.

6. The networked booster power supply method for a city rail power supply system according to claim 5, wherein The S40 further comprises: S43, an emergency response plan library is established, and a plurality of preset supporting power supply schemes are stored for different types of faults and operating conditions.

7. The networked booster power supply method for a transit power supply system according to claim 1, wherein The number of substations covered by the power supply area corresponding to the adjacent open-close station for supporting power supply does not exceed 5.

8. A networked assistance power supply system for a transit power supply system for implementing the networked assistance power supply method for the transit power supply system according to any one of claims 1 to 7, characterized by Comprise: A topology model construction module is configured to obtain information of a city rail power supply system and a city rail line within a specified range, and construct a city rail topology model according to the information; A backup capacity acquisition module is configured to input the city rail topology model into a preset simulation simulator to perform a first simulation experiment, and obtain backup capacity of each open-close station of the city rail power supply system under a normal operating state; An operating parameter acquisition module is configured to input the city rail topology model into the preset simulation simulator to perform a second simulation experiment, and obtain operating parameters of the city rail power supply system when different candidate schemes are used respectively in the case of a fault occurring in a specified open-close station; Wherein, the different candidate schemes are to use any adjacent open-close station for supporting power supply, and the adjacent open-close station includes two adjacent open-close stations on a city rail line to which the specified open-close station belongs and another open-close station in a transfer station to which the specified open-close station belongs; An optimal scheme selection module is configured to determine whether each candidate scheme satisfies a preset constraint condition according to the backup capacity and the operating parameters, calculate the number of substations covered by the power supply area corresponding to the adjacent open-close station for supporting power supply for each candidate scheme satisfying the preset constraint condition, and select the candidate scheme with the least number of substations as the optimal supporting power supply scheme.

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