A method for selecting a signal equipment room that is compatible with electromagnetic interference

Abstract

The invention provides a method for selecting a signal equipment room that is compatible with electromagnetic interference, which belongs to the field of signal equipment room selection, including determining a candidate area for a signal equipment room, and based on the location of a substation, narrowing the scope of the candidate area through density clustering analysis to obtain a selection area; dividing a number of cells in the selection area, and using a substation that meets a preset electromagnetic interference condition as a substation to be simulated; filtering out some cells by performing finite element simulation on the electric field strength and magnetic field strength of the substation to be simulated during normal operation; determining the selection priority of the remaining cells after filtering by performing finite element simulation on the electric field strength and magnetic field strength when the substation to be simulated is in a ground fault; and selecting the corresponding cell as the selection location of the signal equipment room according to the selection priority. The method considers the influencing factors of electromagnetic interference, and determines the selection area with the best conditions according to the actual substation situation of the railway project.

Description

Technical Field

[0001] The invention relates to the field of site selection for a signal equipment room, and in particular to a site selection method for a signal equipment room that is compatible with electromagnetic interference. Background Art

[0002] In the construction of railway projects, it is usually necessary to build substations containing electrical equipment, as well as signal equipment rooms such as signal towers, relay stations, and line stations. Studies have shown that electrical cables between electrical equipment will produce a certain electromagnetic induction on signal cables between signal equipment. Since the parallel distance between 10kV and 0.4kV power cables and signal cables is short, the induced voltage of power cables on signal equipment is small. Therefore, the electromagnetic interference of power equipment is the main factor to be considered. Considering that power cables will have a certain electromagnetic induction effect on signal cables. There are two main coupling pathways for electromagnetic interference: one is through wire transmission, that is, directly invading sensitive equipment through the signal line, control line, power line, etc. of the equipment. This transmission method is called conducted interference. The second is through spatial radiation. The electric field and magnetic field in the space around the disturbance source will interfere with nearby sensitive equipment. This method is called near-field coupling interference. At the same time, the electromagnetic interference energy will be transmitted to a distance in the form of electromagnetic waves, thereby affecting sensitive equipment in the distance. This method is called distant radiation interference. In reality, the above-mentioned disturbance transmission modes are often mixed.

[0003] At present, among the railway projects that have been built and operated in China, some 10 / 0.4kV substations are co-located with signal equipment rooms such as signal towers, relay stations, and line stations, while others are independently set up outside signal equipment rooms such as signal towers, relay stations, and line stations. If the distance between electrical equipment and signal equipment is too close, the electromagnetic interference generated by the mutual coupling of electromagnetic fields may affect the safe and stable operation of signal equipment. If the distance between electrical equipment and signal equipment is too far, the investment in power supply lines, land occupation, and civil engineering will be greatly increased. Therefore, when planning the construction of railway projects, it is necessary to consider the safe clearance between the substation containing electrical equipment and the signal equipment room containing signal equipment, so as to complete the site selection of the signal equipment room. Since railway construction projects usually involve a variety of substations with different capacities or voltage levels, and there is no direct provision for the safe distance between railway indoor substations and signal equipment houses in the current relevant industry standards and specifications, the same railway substation and signal equipment house setting plan and relative distance standard are inconsistent, which is not conducive to the unification of railway power system construction standards and affects the site selection efficiency of signal equipment rooms. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for site selection of a signal equipment room that is compatible with electromagnetic interference, and to determine the site selection area with the best conditions according to the actual substation conditions of a railway project.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for selecting a site for a signal equipment room that is compatible with electromagnetic interference, comprising the following steps:

[0006] S1: Determine the candidate area of ​​the signal equipment room, and based on the location of the substation in the candidate area, narrow the scope of the candidate area through density cluster analysis to obtain the site selection area;

[0007] S2: Divide the site selection area into several cells, and select the substations that meet the preset electromagnetic interference conditions as the substations to be simulated;

[0008] S3: Filter out some cells by performing finite element simulation on the electric field strength and magnetic field strength of the simulated substation during normal operation;

[0009] S4: by performing finite element simulation on the electric field strength and magnetic field strength when the substation to be simulated has a ground fault, combined with historical ground fault data of the substation to be simulated, determining the site selection priority of the cells remaining after filtering;

[0010] S5: According to the site selection priority, select the corresponding cell as the site selection location of the signal equipment room.

[0011] In a preferred solution, in step S1, the steps of determining the site selection area are as follows:

[0012] S11: Based on the coordinate points of the candidate area where the substation is located, the substation is divided into multiple clusters through the DBSCAN algorithm;

[0013] S12: Determine the occupied area of ​​each cluster, remove the occupied area from the candidate area, and use the removed area as the site selection area.

[0014] In a preferred solution, the step S11 specifically includes the following steps:

[0015] S111: Determine the coordinate points of the candidate area where the substation is located, and randomly select a coordinate point;

[0016] S112: Preset an ε-neighborhood and a density threshold, and determine whether the selected coordinate point is a core point according to the preset Eps neighborhood and density threshold, and if so, create a cluster for the selected coordinate point;

[0017] S113: Gather all coordinate points that are density-reachable with the core point into the created cluster;

[0018] S114: reselect new coordinate points from the coordinate points that are not clustered, and repeat S112 to S113 until there is no coordinate point that can be used as a core point.

[0019] In a preferred solution, in step S12, the area occupied by each cluster is determined as follows: based on the four geographical directions of east, west, south and north, an envelope rectangle is generated for each cluster respectively, and the area of ​​the envelope rectangle is used as the area occupied by each cluster.

[0020] In a preferred solution, in step S2, the substation that meets the preset electromagnetic interference condition is a substation that meets any of the following conditions:

[0021] 1) The substation whose distance from the center point of the cell is less than the preset distance value;

[0022] 2) A substation where the transformer capacity is greater than the preset capacity value.

[0023] In a preferred solution, in step S2, the area of ​​the cell is larger than the floor area of ​​the signal equipment room.

[0024] In a preferred solution, the specific operation of step S3 is as follows:

[0025] According to the parameters of the substation during normal operation, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by using physical field simulation software, and a first electric field strength distribution diagram and a first magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the first electric field strength distribution diagram and the first magnetic field strength distribution diagram are both the distances to the substation to be simulated, the ordinates of the first electric field strength distribution diagram are the electric field strength, and the ordinates of the first magnetic field strength distribution diagram are the magnetic field strength;

[0026] In the first electric field intensity distribution diagram and the first magnetic field intensity distribution diagram, respectively, determine a position where the slope is lower than a preset slope threshold, and use the horizontal coordinate value corresponding to the position as a first standard value of the electromagnetic interference safety clearance;

[0027] With the substation to be simulated as the center and the first standard value as the radius, a first electromagnetic interference area corresponding to the substation to be simulated is generated, and cells that overlap with the first electromagnetic interference area are filtered out.

[0028] In a preferred solution, step S4 includes:

[0029] According to the substation parameters at the time of the ground fault, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by using the physical field simulation software, and a second electric field strength distribution diagram and a second magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the second electric field strength distribution diagram and the second magnetic field strength distribution diagram are both the distances from the substation to be simulated, the ordinate of the second electric field strength distribution diagram is the electric field strength, and the ordinate of the second magnetic field strength distribution diagram is the magnetic field strength;

[0030] In the second electric field strength distribution diagram and the second magnetic field strength distribution diagram, respectively, determine a position where the slope is lower than a preset slope threshold, and use the horizontal coordinate value corresponding to the position as a second standard value of the electromagnetic interference safety clearance;

[0031] Taking the substation to be simulated as the center of the circle and the second standard value as the radius, generating a second electromagnetic interference area corresponding to the substation to be simulated, and calculating the overlapping area of ​​the remaining cells and the second electromagnetic interference area;

[0032] According to the historical grounding fault data of the substation to be simulated, the number of occurrences of the grounding faults of the substation to be simulated within a preset historical period is obtained, and the number of occurrences is normalized and then multiplied by the overlap area;

[0033] The site selection priority is set based on the product, and the smaller the product is, the higher the site selection priority is.

[0034] In a preferred solution, the substation parameters in steps S3 and S4 include transformer capacity, transformer voltage level, current on the low-voltage side and the high-voltage side, and transformer installation method, and the transformer installation method includes exposed installation and installation with a closed casing.

[0035] In a preferred solution, in step S5, according to the required number of signal equipment rooms in the construction of the railway power system, the corresponding cells are selected as the site selection locations according to the adjusted site selection priorities from high to low.

[0036] The invention provides a method for selecting a site for a signal equipment room that is compatible with electromagnetic interference, which has the following beneficial effects:

[0037] 1. Combining density cluster analysis with electromagnetic interference simulation, the safe distance between substations and signal equipment in the construction of railway power systems is determined. It has important practical engineering value for the relative layout of substations and signal equipment houses for high-speed railways, intercity railways, railway station planning and site selection, ensuring the safe operation of signal equipment, and saving project investment, and improves the site selection efficiency of signal equipment rooms.

[0038] 2. In step S1 of the present invention, the DBSCAN algorithm is used to analyze the part of the candidate area where the substations are more concentrated. Since the more concentrated the substations are, the greater the electromagnetic interference they generate, this part is eliminated to achieve a preliminary narrowing of the candidate area.

[0039] 3. In step S2 of the present invention, based on the result of density cluster analysis, some substations are selected for simulation without simulation analysis for each substation, thereby reducing the cumbersome steps of simulating some substations that may obviously cause electromagnetic interference.

[0040] 4. In step S5 of the present invention, based on the electromagnetic field simulation results of the substation to be simulated in normal operation and ground fault conditions, it is determined whether each cell meets the construction conditions of the signal equipment room, and the site selection priority of the cells that meet the conditions is determined, so as to determine the site selection area with the best conditions according to the actual substation situation of the railway project. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of the process of the present invention;

[0043] Figure 2 It is a simulation schematic diagram of the electric field intensity distribution diagram of the bare transformer during normal operation;

[0044] Figure 3 It is a simulation schematic diagram of the electric field intensity distribution diagram of the non-exposed transformer during normal operation;

[0045] Figure 4 It is a simulation schematic diagram of the magnetic field intensity distribution diagram of the bare transformer during normal operation;

[0046] Figure 5 It is a simulation schematic diagram of the magnetic field intensity distribution diagram of a non-exposed transformer during normal operation;

[0047] Figure 6 It is a simulation schematic diagram of the electric field intensity distribution diagram when the bare transformer is grounded;

[0048] Figure 7 This is a simulation diagram of the magnetic field intensity distribution diagram corresponding to iron sheets of different thicknesses when a non-exposed transformer has a grounding fault. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution will be clearly and completely described below in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be understood that in various embodiments of the present invention, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0051] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0052] It should be understood that in the present invention, "plurality" refers to two or more than two. "And / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains A, B and C", "Contains A, B, C" means that A, B, and C are all included, "Contains A, B or C" means that one of A, B, and C is included, and "Contains A, B and / or C" means that any one, any two, or any three of A, B, and C are included.

[0053] The technical solution of the present invention is described in detail with specific embodiments below. The embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0054] Combination Figures 1 to 7 The specific embodiments of the present invention are described in further detail.

[0055] In existing railway construction projects, the main signal equipment in the signal equipment room includes: centralized dispatching (CTC) or transportation dispatching and command (TDCS), radio block center (RBC), temporary speed limit server (TSRS), train control center (TCC), LEU, safety data network, automatic block (including ZPW-2000 frequency-shifting track), axle counting equipment, computer interlocking (CBI), centralized signal monitoring (CSM), shunting protection system, EMU control centralized system (CCS), wireless shunting locomotive signal and monitoring system, hump automatic control, integrated intelligent power supply screen, etc. Any electronic equipment inside the signal equipment room is a source of electromagnetic interference and also a sensitive device. On the one hand, surge protection measures are set at the beginning and end of the low-voltage distribution power supply from the railway power department substation to the signal equipment, which can effectively limit the surge voltage impact. On the other hand, the level of conducted interference caused by the power supply line is almost the same. Therefore, when selecting the site for the signal equipment room, this embodiment mainly considers the electromagnetic interference with space radiation as the transmission path.

[0056] This embodiment combines density clustering analysis with electromagnetic interference simulation to achieve the determination of the safe distance between substations and signal equipment in the construction of railway power systems. It has important practical engineering value for the relative layout of substations and signal equipment houses for high-speed railways, intercity railways, etc., railway station planning and site selection, ensuring the safe operation of signal equipment, and saving project investment, and improves the site selection efficiency of signal equipment rooms.

[0057] like Figure 1 As shown, a method for selecting a site for a signal equipment room that is compatible with electromagnetic interference includes the following steps:

[0058] S1: Determine the candidate area of ​​the signal equipment room. In order to preliminarily narrow the scope of the candidate area, analyze the more concentrated parts of the substation distribution in the candidate area, and divide the concentrated substations into a cluster. Specifically, based on the location of the substations in the candidate area, the scope of the candidate area is narrowed through density clustering analysis to obtain the site selection area.

[0059] The specific operations are as follows:

[0060] S11: Based on the coordinate points of the candidate area where the substation is located, the substation is divided into multiple clusters through the DBSCAN algorithm.

[0061] The DBSCAN (Density-Based Spatial Clustering of Applications with Noise) algorithm is a density clustering algorithm that defines a cluster as the largest set of density-connected points. It can divide areas with sufficiently high density into clusters and can find clusters of arbitrary shapes in noisy spatial databases.

[0062] The step S11 specifically includes the following steps:

[0063] S111: Determine the coordinate points of the candidate area where the substation is located, and randomly select a coordinate point.

[0064] S112: Preset an ε-neighborhood and a density threshold, and determine whether the selected coordinate point is a core point according to the preset ε-neighborhood and the density threshold, and if so, create a cluster for the selected coordinate point.

[0065] Here, "ε" is a preset distance threshold, which is used to define a circular area around a point. The distance between all points in this area and the center point is less than or equal to ε. In the DBSCAN algorithm, the ε-neighborhood is an important basis for determining the neighborhood range of a point, and then judging whether the point is a core point, a boundary point, or a noise point. Simply put, the ε-neighborhood is a circular area with a radius of ε around a point, which can be represented by the ε-neighborhood.

[0066] S113: Gather all coordinate points that are density-reachable with the core point into the created cluster.

[0067] S114: reselect new coordinate points from the coordinate points that are not clustered, and repeat S112 to S113 until there is no coordinate point that can be used as a core point.

[0068] The basic idea of ​​the DBSCAN algorithm is to arbitrarily select a data object in the data set, query its neighborhood density within a given radius, and if the neighborhood density exceeds a given threshold, define it as a cluster, and perform the same density calculation on its neighboring data objects, and then expand and merge the clusters. This embodiment uses the DBSCAN algorithm to analyze the part of the candidate area where substations are more concentrated. Since the more concentrated the substations are, the greater the electromagnetic interference they generate, this part is eliminated to achieve a preliminary reduction in the candidate area.

[0069] S12: Determine the occupied area of ​​each cluster, remove the occupied area from the candidate area, and use the removed area as the site selection area.

[0070] The operation of determining the occupied area of ​​each cluster is as follows: based on the four geographical directions of east, west, south and north, an envelope rectangle is generated for each cluster respectively, and the area of ​​the envelope rectangle is used as the occupied area of ​​each cluster.

[0071] The area occupied by each cluster is processed into an envelope rectangle to facilitate the segmentation of candidate areas and provide convenience for the subsequent site selection area division.

[0072] S2: Divide the site selection area into a number of cells. In this embodiment, the actual geographical conditions of the site selection area can be combined, such as selecting a flat area suitable for building a machine room to divide the cells, and the area of ​​the cell is larger than the area occupied by the signal equipment room. In this embodiment, the appropriate site selection location will be determined in units of cells later.

[0073] In addition, in order to improve the efficiency of electromagnetic interference simulation, in this embodiment, based on the results of density cluster analysis, some substations are selected for simulation, without the need to perform simulation analysis on each substation, thereby reducing the cumbersome steps of simulating some substations that will obviously cause electromagnetic interference. The substation that meets the preset electromagnetic interference conditions meets any of the following conditions:

[0074] 1) The substation whose distance from the center point of the cell is less than the preset distance value;

[0075] 2) A substation where the transformer capacity is greater than the preset capacity value.

[0076] The screening principle of the electromagnetic interference conditions is that, on the one hand, the electromagnetic interference impact of substations with a smaller distance is analyzed. If the electromagnetic interference impact caused by these substations meets the construction requirements of the signal equipment room, then other substations with a larger distance must also meet the construction requirements of the signal equipment room; on the other hand, the substations with larger transformer capacity are analyzed. If the electromagnetic interference impact caused by these substations meets the construction requirements of the signal equipment room, then other substations with smaller capacity must also meet the construction requirements of the signal equipment room.

[0077] By selecting some substations for simulation analysis through density cluster analysis, the number of substations that need to be simulated can be reduced and the simulation efficiency can be improved.

[0078] Furthermore, in steps S3 and S4, the present embodiment performs simulations under two conditions, namely, normal operation of the substation to be simulated and ground fault, to improve the accuracy of site selection, as follows:

[0079] S3: By performing finite element simulation on the electric field strength and magnetic field strength of the simulated substation during normal operation, some cells are filtered out. The specific operations are as follows:

[0080] According to the substation parameters during normal operation, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by COMSOL software, and a first electric field strength distribution diagram and a first magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the first electric field strength distribution diagram and the first magnetic field strength distribution diagram are both the distances to the substation to be simulated, the ordinates of the first electric field strength distribution diagram are the electric field strength, and the ordinates of the first magnetic field strength distribution diagram are the magnetic field strength.

[0081] In the first electric field strength distribution diagram and the first magnetic field strength distribution diagram, respectively, positions where the slopes are lower than a preset slope threshold are determined, and the abscissa values ​​corresponding to the positions are used as the first standard values ​​of the electromagnetic interference safety clearance.

[0082] With the substation to be simulated as the center and the first standard value as the radius, a first electromagnetic interference area corresponding to the substation to be simulated is generated, and cells that overlap with the first electromagnetic interference area are filtered out.

[0083] COMSOL software can simulate the electromagnetic field intensity by finite element simulation. The basic idea of ​​finite element method is to transform the well-defined problem described by partial differential equation into variational problem or weighted residual equation, and discretize the variational problem into the extreme value problem of multivariate function or directly expand the weighted residual equation by using split interpolation, so as to form a set of algebraic equations, and then solve the set of equations to obtain the approximate solution of the boundary value problem. The operation process of various traditional analysis software of finite element method is basically the same. In this embodiment, COMSOL software is used to simulate and analyze the power frequency electromagnetic field radiation of railway substation, which includes pre-processing, loading and solving, general post-processing and other main parts to divide the whole simulation process into stages. Pre-processing refers to the preliminary preparation work of finite element simulation, which mainly includes the establishment of simulation model, setting of model material parameters, selection of boundary conditions for solving problems and meshing; loading and solving settings are to select the solution frequency, solution step size, solution accuracy and other settings for the established model; post-processing refers to data processing, and the finite element calculation results are usually displayed in the form of cloud maps.

[0084] In the embodiment, in order to facilitate the determination of the critical point of the electromagnetic field changing with the distance, it is also necessary to process the cloud map simulated by the COMSOL software into a curve graph in the form of two-dimensional coordinates to represent the distribution of the electromagnetic field changing with the distance, such as Figures 2~5 The simulation results of the electromagnetic field strength of transformers with different installation methods under normal operation are shown in turn. It can be seen that no matter how the transformer is installed, the strength decreases with the increase of distance and eventually approaches 0. This embodiment converts the cloud map into a two-dimensional coordinate map, the purpose of which is to determine the critical point where the strength is close to 0, so as to facilitate the determination of the site selection area that meets the electromagnetic field interference requirements.

[0085] S4: By performing finite element simulation on the electric field strength and magnetic field strength when the substation to be simulated has a ground fault, combined with the historical ground fault data of the substation to be simulated, the site selection priority of the cells remaining after filtering is determined. The specific operations are as follows:

[0086] According to the substation parameters during the ground fault, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by COMSOL software, and a second electric field strength distribution diagram and a second magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the second electric field strength distribution diagram and the second magnetic field strength distribution diagram are both the distances to the substation to be simulated, the ordinate of the second electric field strength distribution diagram is the electric field strength, and the ordinate of the second magnetic field strength distribution diagram is the magnetic field strength.

[0087] In the second electric field strength distribution diagram and the second magnetic field strength distribution diagram, respectively, determine a position where the slope is lower than a preset slope threshold, and use the horizontal coordinate value corresponding to the position as a second standard value of the electromagnetic interference safety clearance;

[0088] With the substation to be simulated as the center and the second standard value as the radius, a second electromagnetic interference area corresponding to the substation to be simulated is generated, and the overlapping area of ​​the remaining cells and the second electromagnetic interference area is calculated.

[0089] According to the historical grounding fault data of the substation to be simulated, the number of occurrences of the grounding faults of the substation to be simulated within a preset historical period is obtained, and the number of occurrences is normalized and then multiplied by the overlap area.

[0090] The site selection priority is set based on the product, and the smaller the product is, the higher the site selection priority is.

[0091] In this embodiment, considering the possibility of ground fault in the substation, and the research shows that the electromagnetic interference generated by the substation when the ground fault occurs is generally stronger than that in normal operation. Therefore, in order to further optimize the site selection result of the signal equipment room, this embodiment uses COMSOL software to simulate the electric field strength and magnetic field strength of the simulated substation when the ground fault occurs. Taking the simulation of magnetic field strength as an example, in this embodiment, the single-phase ground fault and two-phase ground fault on the low-voltage side and high-voltage side of the transformer can be simulated in the same way, and the cloud map can be converted into a two-dimensional coordinate map in the same way as S3, such as Figure 6 and Figure 7 Shown is the simulation result of magnetic field intensity distribution during single-phase grounding fault.

[0092] Similarly, this embodiment converts the cloud map into a two-dimensional coordinate map, the purpose of which is to determine the critical point where the intensity is close to 0, so as to facilitate the determination of the site selection area that meets the electromagnetic field interference requirements. It should be noted that, considering that the occurrence of a ground fault in a substation is a probabilistic event, even if the electromagnetic interference intensity during a ground fault does not meet the construction requirements, the corresponding cells will not be directly eliminated, but the corresponding site selection priority will be set according to the number of ground faults in the substation to be simulated within a preset historical period. Therefore, even if no cell can meet the electromagnetic interference conditions at the same time when the substation is operating normally and has a ground fault, it can also be considered to ignore the electromagnetic interference caused by the substation with a relatively low fault frequency, so as to meet the construction needs of the signal equipment room to the greatest extent.

[0093] The substation parameters in the above steps S3 and S4 include transformer capacity, transformer voltage level, current on the low-voltage side and high-voltage side, and transformer installation method, and the transformer installation method includes exposed installation and installation with a closed casing.

[0094] S5: According to the site selection priority, select the corresponding cell as the site selection location of the signal equipment room.

[0095] According to the required number of signal equipment rooms in the construction of the railway power system, the corresponding cells are selected as the site locations according to the adjusted site selection priority from high to low.

[0096] This embodiment determines whether each cell meets the construction conditions of a signal equipment room and determines the site selection priority of cells that meet the conditions based on the electromagnetic field simulation results of the substation to be simulated in normal operation and ground fault conditions, thereby determining the site selection area with the best conditions according to the actual substation conditions of the railway project.

[0097] A specific example is used to assist in explaining how to determine the site selection address according to the site selection priority. Assume that there are two remaining cells B and C, and their overlapping areas with the second electromagnetic interference area of ​​the simulated substation A are 100 square meters and 50 square meters respectively. The normalized number of ground fault occurrences is 0.5.

[0098] The product of the site selection priorities for cell B is: 0.5 × 100 = 50.

[0099] The product of the site selection priorities for cell C is: 0.5 × 50 = 25.

[0100] Therefore, cell C has a higher site selection priority and should be selected as the site selection location for the signal equipment room.

[0101] The serial numbers in the above embodiments are for description only and do not represent the sequence of the components during assembly or use.

[0102] The above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for selecting a site for a signal equipment room that is compatible with electromagnetic interference, characterized in that: The steps include: S1: Determine the candidate area of ​​the signal equipment room, and based on the location of the substation in the candidate area, narrow the scope of the candidate area through density cluster analysis to obtain the site selection area; S2: Divide the site selection area into several cells, and select the substations that meet the preset electromagnetic interference conditions as the substations to be simulated; S3: By performing finite element simulation on the electric field strength and magnetic field strength of the simulated substation during normal operation, some cells are filtered out. The specific operation of step S3 is as follows: According to the parameters of the substation during normal operation, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by using physical field simulation software, and a first electric field strength distribution diagram and a first magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the first electric field strength distribution diagram and the first magnetic field strength distribution diagram are both the distances to the substation to be simulated, the ordinates of the first electric field strength distribution diagram are the electric field strength, and the ordinates of the first magnetic field strength distribution diagram are the magnetic field strength; In the first electric field intensity distribution diagram and the first magnetic field intensity distribution diagram, respectively, determine a position where the slope is lower than a preset slope threshold, and use the horizontal coordinate value corresponding to the position as a first standard value of the electromagnetic interference safety clearance; Taking the substation to be simulated as the center of the circle and the first standard value as the radius, generating a first electromagnetic interference area corresponding to the substation to be simulated, and filtering out cells that overlap with the first electromagnetic interference area; S4: by performing finite element simulation on the electric field strength and magnetic field strength when the substation to be simulated has a ground fault, combined with historical ground fault data of the substation to be simulated, determining the site selection priority of the cells remaining after filtering, the step S4 includes: According to the substation parameters at the time of the ground fault, the electric field strength simulation and the magnetic field strength simulation are respectively performed on the substation to be simulated by using the physical field simulation software, and a second electric field strength distribution diagram and a second magnetic field strength distribution diagram are respectively generated, wherein the abscissas of the second electric field strength distribution diagram and the second magnetic field strength distribution diagram are both the distances from the substation to be simulated, the ordinate of the second electric field strength distribution diagram is the electric field strength, and the ordinate of the second magnetic field strength distribution diagram is the magnetic field strength; In the second electric field strength distribution diagram and the second magnetic field strength distribution diagram, respectively, determine a position where the slope is lower than a preset slope threshold, and use the horizontal coordinate value corresponding to the position as a second standard value of the electromagnetic interference safety clearance; Taking the substation to be simulated as the center of the circle and the second standard value as the radius, generating a second electromagnetic interference area corresponding to the substation to be simulated, and calculating the overlapping area of ​​the remaining cells and the second electromagnetic interference area; According to the historical grounding fault data of the substation to be simulated, the number of occurrences of the grounding faults of the substation to be simulated within a preset historical period is obtained, and the number of occurrences is normalized and then multiplied by the overlap area; Setting a site selection priority based on the product, the smaller the product, the higher the site selection priority; S5: According to the site selection priority, select the corresponding cell as the site selection location of the signal equipment room.

2. A method for selecting a site for a signal equipment room that is compatible with electromagnetic interference according to claim 1, characterized in that: In step S1, the steps for determining the site selection area are as follows: S11: Based on the coordinate points of the candidate area where the substation is located, the substation is divided into multiple clusters through the DBSCAN algorithm; S12: Determine the occupied area of ​​each cluster, remove the occupied area from the candidate area, and use the removed area as the site selection area.

3. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 2, characterized in that: The step S11 specifically includes the following steps: S111: Determine the coordinate point of the candidate area where the substation is located, and randomly select a coordinate point; S112: Preset an ε-neighborhood and a density threshold, and determine whether the selected coordinate point is a core point according to the preset ε-neighborhood and the density threshold, and if so, create a cluster for the selected coordinate point; S113: Gather all coordinate points that are density-reachable with the core point into the created cluster; S114: reselect new coordinate points from the coordinate points that are not clustered, and repeat S112 to S113 until there is no coordinate point that can be used as a core point.

4. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 2, characterized in that: In step S12, the area occupied by each cluster is determined as follows: based on the four geographical directions of east, west, south and north, an envelope rectangle is generated for each cluster respectively, and the area of ​​the envelope rectangle is used as the area occupied by each cluster.

5. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 1, characterized in that: In step S2, the substation that meets the preset electromagnetic interference condition is a substation that meets any of the following conditions: 1) The substation whose distance from the center point of the cell is less than the preset distance value; 2) A substation where the transformer capacity is greater than the preset capacity value.

6. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 1, characterized in that: In the step S2, the area of ​​the cell is larger than the floor area of ​​the signal equipment room.

7. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 1, characterized in that: The substation parameters in steps S3 and S4 include transformer capacity, transformer voltage level, current on the low-voltage side and the high-voltage side, and transformer installation method, and the transformer installation method includes bare installation and installation with a closed casing.

8. The method for selecting a site for a signal equipment room compatible with electromagnetic interference according to claim 1, characterized in that: In step S5, according to the required number of signal equipment rooms in the construction of the railway power system, the corresponding cells are selected as the site selection positions according to the adjusted site selection priorities from high to low.

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