A node-branch model establishment method and device of a direct current traction power supply system and a storage medium

Abstract

The application discloses a node-branch model establishment method and device of a direct-current traction power supply system and a storage medium; the method comprises the following steps: performing topological analysis on a city rail transit power supply system to obtain topological information of a traction substation; according to the classification result of topological nodes of the traction substation, topological nodes required for establishing a node model are screened out, and the connection relationship between the screened topological nodes and a traction network is determined; topological information of a train connected with the traction network is acquired; a node model is constructed through the screened topological nodes and the topological nodes corresponding to each train; each node in the node model is connected in turn according to the order of kilometer marks from small to large, the connection relationship between the nodes is obtained, the resistance of each branch is determined, and the node-branch model of the direct-current traction power supply system is obtained. The application can provide strong technical support for the traction power supply calculation, application development and the like of the city rail transit power supply system.

Description

Technical Field

[0001] This invention relates to the field of simulation and calculation technology for urban rail transit power supply systems, and in particular to a method, apparatus and storage medium for establishing a node-branch model of a DC traction power supply system. Background Technology

[0002] The establishment of node-branch models for DC traction power supply systems is the foundation for traction power supply calculations, which are an important network analysis tool for urban rail transit power supply systems. Currently, traction power supply calculations are mainly used in the design phase of urban rail transit power supply systems. Simulation software is generally used for calculations, and primitives are used to model the power supply system. However, when using primitives for modeling, in order to improve the speed of reading primitive information, there is often a problem of extensive simplification of the actual power supply system. The calculation errors caused by the model simplification affect the accuracy of traction power supply calculations. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method, device and storage medium for establishing a node-branch model of a DC traction power supply system, which can provide strong technical support for the development of traction power supply calculation applications for urban rail transit power supply systems.

[0004] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0005] In a first aspect, the present invention provides a method for establishing a node-branch model of a DC traction power supply system, the method comprising:

[0006] A topology analysis was performed on the urban rail transit power supply system to obtain the topology information of the traction substation.

[0007] Based on the topology information, the topology nodes of the traction substation are classified, and the topology nodes that meet the requirements for establishing the node model are selected according to the classification results.

[0008] Based on the structural characteristics of the DC traction power supply system, the connection relationship between the selected topology nodes and the traction network is determined;

[0009] Using traction calculation and flat running diagrams, the topology information of trains connected to the traction network is obtained, and each train is equivalent to two topology nodes;

[0010] A node model is constructed using the selected topology nodes and the topology nodes corresponding to each train.

[0011] By combining the connection relationship between the topological nodes and the traction network, the nodes in the node model are connected in order of their kilometer markers from smallest to largest to obtain the connection relationship between the nodes and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system.

[0012] In conjunction with the first aspect, preferably, the topology information of the traction substation includes:

[0013] The topology nodes contained within the traction substation;

[0014] The connection relationship between the topology nodes contained in the traction substation and the traction network;

[0015] Kilometer markers for traction substations;

[0016] The kilometer markers of the traction substation serve as the location information of its topological nodes.

[0017] In conjunction with the first aspect, preferably, the step of classifying the topology nodes of the traction substation based on the topology information includes: classifying the topology nodes of the traction substation into the following six categories according to the connection relationship between the topology nodes in the traction substation and the rectifier units and the traction network, and by defining an enumeration quantity DCTNODETYPE:

[0018] allrecnode represents a topology node that can establish a connection with the positive terminals of two rectifier units within the traction substation;

[0019] trecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 1 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 2.

[0020] zrecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 2 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 1.

[0021] ocsnode refers to a topology node that can establish a connection with the overhead contact line but cannot establish a connection with the positive terminal of the rectifier unit;

[0022] negrecnode represents a topology node that can establish a connection with the negative terminal of the rectifier unit;

[0023] A railnode is a topology node that can connect to a rail but cannot connect to the negative terminal of a rectifier unit.

[0024] In conjunction with the first aspect, preferably, the step of selecting the topology nodes that meet the requirements for establishing the node model based on the classification results includes: removing the topology nodes in the traction substation that are classified as ocsnode and railnode, and the remaining topology nodes are the topology nodes that meet the requirements for establishing the node model.

[0025] In conjunction with the first aspect, preferably, determining the connection relationship between the selected topology nodes and the traction network includes: connecting the left and right traction networks, connecting the right traction network, connecting the left traction network, and connecting the right traction network; the "left" and "right" in the connection relationship are defined by the kilometer marker size of another traction substation connected to the traction network.

[0026] In conjunction with the first aspect, preferably, the train's topology information includes:

[0027] Types of train topology nodes;

[0028] Injected current at train topology nodes;

[0029] Location information of train topology nodes.

[0030] In conjunction with the first aspect, preferably, the step of constructing a node model using the selected topology nodes and the topology nodes corresponding to each train includes:

[0031] Add the selected topology nodes to the node model;

[0032] Determine whether the topology nodes corresponding to each train overlap with the topology nodes within the traction substation;

[0033] If an overlap occurs, find the node in the node model that overlaps with the topological node in the traction substation, and superimpose the injected current of the train onto the overlapping node.

[0034] If there is no overlap, the topology node corresponding to that train will be directly added to the node model.

[0035] Secondly, the present invention provides a node-branch model establishment device for a DC traction power supply system, the device comprising:

[0036] The topology analysis module is used to perform topology analysis on the urban rail transit power supply system to obtain the topology information of the traction substation.

[0037] The classification and filtering module is used to classify the topology nodes of the traction substation based on the topology information, and filter out the topology nodes that meet the requirements for establishing the node model according to the classification results.

[0038] The connection relationship determination module is used to determine the connection relationship between the selected topology nodes and the traction network based on the structural characteristics of the DC traction power supply system.

[0039] The train topology information acquisition module is used to acquire the topology information of trains connected to the traction network by means of traction calculation and flat operation diagram, and to treat each train as two topology nodes.

[0040] The node model building module is used to build a node model using the selected topology nodes and the topology nodes corresponding to each train.

[0041] The node-branch model acquisition module is used to combine the connection relationship between the topological nodes and the traction network, connect each node in the node model in ascending order of its kilometer marker, obtain the connection relationship between each node, and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system.

[0042] Thirdly, the present invention provides a node-branch model building device for a DC traction power supply system, including a processor and a storage medium;

[0043] The storage medium is used to store instructions;

[0044] The processor is configured to operate according to the instructions to perform the steps of the node-branch model establishment method for the DC traction power supply system according to any one of the first aspects.

[0045] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the node-branch model establishment method for a DC traction power supply system as described in any of the first aspects.

[0046] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0047] This invention can effectively avoid calculation errors caused by model simplification and can provide strong technical support for the development of traction power supply calculation applications for urban rail transit power supply systems. In traction power supply calculation, the node-branch model of this invention can be directly called for calculation without additional programming, which is convenient and fast and meets the needs of R&D staff for rapid research and use. It not only has the advantages of small calculation volume and high calculation accuracy, but also has great theoretical research and practical value. Attached Figure Description

[0048] Figure 1 This is a flowchart of a node-branch model establishment method for a DC traction power supply system provided in an embodiment of the present invention;

[0049] Figure 2This is a schematic diagram of a DC traction power supply system provided in an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the AC busbar provided in an embodiment of the present invention being connected to two circuit breakers via a topological connection;

[0051] Figure 4 This is a schematic diagram of the connection between the topology nodes and transformer branches formed by the CIM model of the power system provided in this embodiment of the invention;

[0052] Figure 5 This is a schematic diagram illustrating the connection relationship between the topology nodes and the traction network provided in an embodiment of the present invention;

[0053] Figure 6 This is a schematic diagram of the node-branch model provided in an embodiment of the present invention;

[0054] Figure 7 This is a structural block diagram of a node-branch model establishment device for a DC traction power supply system provided in an embodiment of the present invention. Detailed Implementation

[0055] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0056] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0057] Example 1:

[0058] During the operation phase of urban rail transit, the urban rail transit network power dispatching system can provide models conforming to the IEC-61970 standard. Topology analysis can be used to establish node-branch models of the AC power supply system of urban rail transit, effectively avoiding calculation errors caused by model simplification, improving the accuracy of traction power supply calculations, and providing technical support for decision-making by urban rail transit power dispatching personnel. However, the DC traction power supply system of urban rail transit is unique. It includes traction substations, the traction network, and trains. Data from the traction substations and traction network can be obtained from the urban rail transit network power supply system; however, train data cannot be directly collected by the urban rail transit network power dispatching system and can only be simulated. Therefore, to establish a node-branch model of the DC traction power supply system through topology analysis, special processing of the topology analysis results and train information is required. To this end, this embodiment proposes a method for establishing node-branch models of the DC traction power supply system based on topology analysis. Figure 1 As shown, the method specifically includes the following steps:

[0059] Step S1: Perform topology analysis on the urban rail transit power supply system to obtain the topology information of the traction substation;

[0060] Step S2: Based on the topology information, classify the topology nodes of the traction substation, and select the topology nodes that meet the requirements for establishing the node model according to the classification results;

[0061] Step S3: Based on the structural characteristics of the DC traction power supply system, determine the connection relationship between the selected topology nodes and the traction network;

[0062] Step S4: Using traction calculation and flat running diagram, obtain the topology information of trains connected to the traction network, and treat each train as two equivalent topology nodes;

[0063] Step S5: Construct a node model using the selected topology nodes and the topology nodes corresponding to each train;

[0064] Step S6: Combining the connection relationship between the topology nodes and the traction network, connect each node in the node model in ascending order of its kilometer marker to obtain the connection relationship between each node, and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system.

[0065] Specifically, this embodiment uses... Figure 2 This section introduces the DC traction power supply system, which includes the traction substation, overhead contact line, rails, and train. This embodiment provides... Figure 2It includes two traction substations, TSS1 and TSS2, and four trains, TRA1 to TRA4. Taking TSS1 as an example, the power equipment in the traction substation and the power supply principle of the DC traction power supply system are introduced: RecT1 and RecT2 in traction substation TSS1 are two parallel-operating rectifier units (i.e., rectifier unit 1 and rectifier unit 2). Taking rectifier unit 1, RecT1, as an example, RecT1 is connected to the AC bus through an AC circuit breaker, and connected to the DC 1500V positive bus and DC 1500V negative bus through DC circuit breakers 1012 and 1011, respectively. The DC 1500V positive bus and DC 1500V negative bus are then connected to the contact network and the rails through DC circuit breakers, respectively. The power supply principle of rectifier unit 2, RecT2, is the same as that of rectifier unit 1, RecT1, and will not be described in detail here. In addition, the rectifier unit is the most important power equipment in the traction substation. The rectifier unit receives high-voltage AC power from the AC bus, and after stepping down and rectifying it into low-voltage DC power, it provides power to the train.

[0066] It should be noted that before performing the topology analysis in step S1, this embodiment requires modeling the entire power supply system using a Common Information Model (CIM). Based on an object-oriented approach, power equipment is described using classes, and all power equipment classes constitute the entire power supply system. To model the connection relationships between different power equipment, this embodiment defines Terminal and ConnectivityNode classes in the CIM, which are the basic elements constituting the topology analysis. An endpoint refers to a power connection point on a power device, used to connect to a ConnectivityNode. Each type of power equipment has its own specific number of endpoints; for example, a busbar contains one endpoint, and a circuit breaker contains two endpoints. Figure 3 As shown, the AC busbar (ACBUS) includes terminal BUST1, and the circuit breaker (BREAK) includes terminals BRKT1 and BRKT2. Different electrical devices are connected through connection nodes, which are the points where the terminals of the electrical devices are connected together with zero impedance, such as... Figure 3 The AC bus ACBUS is connected to BREAK1 and BREAK2 via connection node CN1.

[0067] To further clarify, the topology analysis in step S1 is the process of generating power system bus / branch connections. In actual power system models, a large number of components are switching devices. Through topology analysis, circuit breakers and disconnectors are reasonably omitted, and only non-zero impedance power equipment such as lines, loads, transformers, and generators are considered to form topology nodes. The connection relationships between power equipment are then transformed into connections based on topology nodes. Topology analysis requires forming all topology nodes in the power system and identifying all connection nodes contained in each topology node. After topology analysis, the power system is expressed as topology nodes and the impedance-bearing connections between topology nodes, i.e., the bus / branch model. Specifically, this embodiment combines... Figure 4 To further explain the topology analysis, Figure 4 Figure (a) is a simple CIM model of a power system. Figure (a) includes circuit breakers B1–B6, terminals 1–26, and connection nodes CN1–CN11. Topology analysis requires forming all connection node objects in the CIM model and identifying all connection nodes contained in each topology node. Assuming all circuit breakers in Figure (a) are in a closed state, the topology analysis ignores the influence of closed switches, merging connection nodes CN1–CN10 to form topology node TN1, and connection node CN11 to form topology node TN2. Load 1 is connected to topology node TN1, and load 2 is connected to topology node TN2. TN1 and TN2 are connected through transformer branches, as detailed below. Figure 4 As shown in Figure (b).

[0068] As one embodiment of the invention, step S1 involves performing topology analysis on the urban rail transit power supply system, including both AC-side and DC-side topology analysis. The AC-side topology analysis focuses on the energization status of the AC-side topology nodes of the rectifier unit, while the DC-side topology analysis focuses on the connection relationships between various electrical devices on the DC side. Specifically, the rectifier unit forms the boundary between the AC-side and DC-side power supply systems. When establishing the node-branch model of the DC traction power supply system, it is necessary to analyze the energized topology nodes. Therefore, it is necessary to focus on the energization status of the DC-side topology nodes. If the AC-side topology nodes of the rectifier unit are energized, then the DC-side topology nodes of the rectifier unit are also energized. Furthermore, if other topology nodes within the DC traction power supply system can establish connections with the energized DC-side topology nodes of the rectifier unit, then their topology nodes are also energized. In this embodiment, after topology analysis, the energization status of all topology nodes within the urban rail transit power supply system is obtained.

[0069] In step S1 of this embodiment of the invention, the topology information of the traction substation obtained based on the results of topology analysis includes: the topology nodes contained in the traction substation, the connection relationship between the topology nodes contained in the traction substation and the traction network, and the kilometer markers of the traction substation; wherein, the kilometer markers of the traction substation serve as the location information of its topology nodes.

[0070] As an embodiment of the present invention, step S2, which classifies the topology nodes of the traction substation based on the topology information, includes: classifying the topology nodes of the traction substation into the following six categories according to the connection relationship between the topology nodes in the traction substation and the rectifier unit and the traction network, and by defining the enumeration quantity DCTNODETYPE:

[0071] allrecnode represents a topology node that can establish a connection with the positive terminals of two rectifier units within the traction substation;

[0072] trecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 1 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 2.

[0073] zrecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 2 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 1.

[0074] ocsnode refers to a topology node that can establish a connection with the overhead contact line but cannot establish a connection with the positive terminal of the rectifier unit;

[0075] negrecnode represents a topology node that can establish a connection with the negative terminal of the rectifier unit;

[0076] A railnode is a topology node that can connect to a rail but cannot connect to the negative terminal of a rectifier unit.

[0077] It should be noted that the purpose of classifying the topology nodes of the traction substation in step S2 includes: first, classifying the topology nodes within the traction substation as positive or negative; since the DC traction power supply system has positive and negative terminals, the topology nodes within the traction substation should also have positive and negative terminals. Topology nodes that are connected to the positive terminal of the rectifier unit or the contact network are considered positive nodes, and topology nodes that are connected to the negative terminal of the rectifier unit or the rail are considered negative nodes; second, determining the number of rectifier units connected to the topology nodes within the traction substation. Different numbers of rectifier units connected result in different injected currents at the corresponding nodes.

[0078] Furthermore, the step S2, which involves selecting the topology nodes that meet the requirements for establishing the node model based on the classification results, includes removing the topology nodes in the traction substation that are classified as ocsnode and railnode, and the remaining topology nodes are the topology nodes that meet the requirements for establishing the node model.

[0079] As an embodiment of the present invention, in step S3, based on the structural characteristics of the DC traction power supply system, the connection relationships between the selected topology nodes and the traction network include four types: connecting to the left and right traction networks, connecting to the right traction network, connecting to the left traction network, and connecting to the right traction network. The "left" and "right" in the connection relationship are determined by the kilometer marker size of another traction substation connected to the traction network. In this embodiment, four boolean variables, bisconnectleftup, bisconnectrightup, bisconnectleftdown, and bisconnectrightdown, are used to represent the above four connection relationships. Each selected topology node within the traction substation contains the above four variables.

[0080] The following is combined with Figure 5 The meanings of the above four variables will be further explained; Figure 5 In this diagram, TSS_A, TSS_B, and TSS_C represent three traction substations. Substation TSS_A contains topology nodes TN_A1 and TN_A2; substation TSS_B contains topology nodes TN_B1 and TN_B2; and substation TSS_C contains topology nodes TN_C1 and TN_C2. CAUP1 and CAUP2 are the upstream contact network between substations TSS_A and TSS_B, and CADOWN1 and CADOWN2 are the downstream contact network between substations TSS_B and TSS_C. This embodiment takes topology node TN_B1 as an example to analyze the determination of the four connection relationships of topology node TN_B1. Assuming that the kilometer markers of substations TSS_A, TSS_B, and TSS_C increase sequentially, and the uplink contact network CAUP1 connects topology nodes TN_A1 and TN_B1, and the kilometer marker of topology node TN_A1 is smaller than that of TN_B1, then TN_A1 is defined as being on the "left" side of TN_B1. From this, it can be concluded that TN_B1 has a connection relationship with the uplink left traction network, and bisconnectleftup is set to true. Similarly, it can be determined that bisconnectrightup, bisconnectleftdown, and bisconnectrightdown of TN_B1 are also true.

[0081] As an embodiment of the present invention, in step S4, since the power supply information of the train cannot be directly collected, the train is not included in the power supply system model. However, the train is part of the power supply system, so the node information of the train needs to be specially processed. In this embodiment, the power supply information of the train is obtained through simulation: first, the traction calculation of a single train is performed to simulate the operation of a single train on the line; then, based on the departure interval information and the traction calculation results of the single train, a flat running map is generated to simulate the distribution of trains along the entire line. Specifically, when simulating the distribution of trains along the entire line, the flat running map is traversed to obtain the running time information in the running map. When the running time is equal to the current calculation time, all trains on the entire line at the current calculation time are found, and each train corresponds to two topology nodes. In addition, obtaining the topology-related information of the train, that is, obtaining the information of the corresponding topology node of the train, includes: the type of the train topology node, the injected current of the train topology node, and the location information of the train topology node. Among them, the location information of the corresponding topology node of the train includes whether the train is going up or down, and the kilometer marker information of the train.

[0082] Furthermore, step S4 in this embodiment also includes classifying the topology node type corresponding to the train, including ocsnode and railnode; where ocsnode indicates that the topology node corresponding to the train can establish a connection with the overhead contact line, and railnode indicates that the topology node corresponding to the train can establish a connection with the rail. In addition, the topology node corresponding to the train needs to be distinguished from the topology nodes within the traction substation. Here, a boolean value bisoftrain is defined; when bisoftrain is true, it indicates a topology node corresponding to the train; otherwise, it is a topology node within the traction substation.

[0083] As an embodiment of the present invention, step S5, which involves constructing a node model using the selected topology nodes and the topology nodes corresponding to each train, includes:

[0084] Add the selected topology nodes to the node model;

[0085] Determine whether the topology nodes corresponding to each train overlap with the topology nodes within the traction substation;

[0086] If an overlap occurs, find the node in the node model that overlaps with the topological node in the traction substation, and superimpose the injected current of the train onto the overlapping node.

[0087] If there is no overlap, the topology node corresponding to that train will be directly added to the node model.

[0088] As an embodiment of the present invention, in step S6, based on the node model of the DC traction power supply system constructed above, branches between nodes are added to obtain the branch model. The specific process is as follows:

[0089] First, construct the lateral branches: based on the connection relationship between the topology nodes within the traction substation and the corresponding topology nodes on the train; the lateral branches include upward lateral branches and downward lateral branches; refer to... Figure 6 This embodiment uses the upstream lateral branch as an example to introduce the construction process of the lateral branch: Based on the nodes corresponding to the upstream train topology nodes and the corresponding traction substation topology nodes in the node model; the nodes are divided into positive and negative categories, sorted according to the kilometer marker from smallest to largest, and then connected from front to back to obtain the connection relationship between the nodes, and the resistance of each branch is further determined. Specifically, Figure 6 It includes 12 nodes: Nodes ① and ② are two nodes of the first traction substation; nodes ⑤ and ⑥ are two nodes of the second traction substation; nodes ⑨ and ⑩ are two nodes of the third traction substation; nodes ③ and ⑦... ④、⑧、 "Don't" refers to 6 trains; among them, nodes ①, ③, ⑤, ⑦, ⑨, Positive nodes, nodes ②, ④, ⑥, ⑧, ⑩ Negative nodes; when constructing the branch model, each node is sorted by kilometer marker from smallest to largest and then connected sequentially to form branches between nodes. Then, the resistance of the transverse branch is determined based on the connection relationship between the topological nodes in the traction substation and the traction network.

[0090] Furthermore, with Figure 6 Taking node ⑤ as an example, determine the resistance of its lateral branch. In the upward lateral branch, consider two connection relationships for node ⑤: bisconnectleftup and bisconnectrightup. Assume that bisconnectleftup of node ⑤ is true and bisconnectrightup is false. If bisconnectleftup is true, it means that node ⑤ and node ③ can be connected normally. Then, the branch resistance R3 between node ⑤ and node ③ is the resistance of the traction network between the two nodes. If bisconnectrightup is false, it means that node ⑤ and node ⑦ cannot be connected normally, and the branch is in a short-circuit state. Then, the branch resistance R4 is infinite.

[0091] Then construct the longitudinal branches: First, add the branches between the positive and negative terminals of the rectifier unit in the traction substation. In a DC traction power supply system, the traction substation is equivalent to a voltage source in series with a resistor, such as... Figure 6The branch between node ① and node ② has a branch resistance R1 that is the internal impedance of the traction substation; adding a train branch, in the DC traction power supply system, the train is equivalent to a power source, such as... Figure 6 The branch between node ③ and node ④.

[0092] Finally, construct the negative node's branch to ground: adding branches to ground requires adding them segment by segment, such as... Figure 6 Two ground-connected branches are added to branches ② and ④, with branch resistances R11 and R12 respectively; two ground-connected branches are also added to branches ④ and ⑥, with branch resistances R13 and R14 respectively, and so on to complete the addition of ground-connected branch resistances; the magnitude of the branch resistance is related to the rail-to-ground transition resistance, which will not be elaborated in this embodiment.

[0093] Example 2:

[0094] like Figure 7 As shown, this embodiment of the invention provides a node-branch model establishment device for a DC traction power supply system, which can be used to implement the method described in Embodiment 1, specifically including:

[0095] The topology analysis module is used to perform topology analysis on the urban rail transit power supply system to obtain the topology information of the traction substation.

[0096] The classification and filtering module is used to classify the topology nodes of the traction substation based on the topology information, and filter out the topology nodes that meet the requirements for establishing the node model according to the classification results.

[0097] The connection relationship determination module is used to determine the connection relationship between the selected topology nodes and the traction network based on the structural characteristics of the DC traction power supply system.

[0098] The train topology information acquisition module is used to acquire the topology information of trains connected to the traction network by means of traction calculation and flat operation diagram, and to treat each train as two topology nodes.

[0099] The node model building module is used to build a node model using the selected topology nodes and the topology nodes corresponding to each train.

[0100] The node-branch model acquisition module is used to combine the connection relationship between the topological nodes and the traction network, connect each node in the node model in ascending order of its kilometer marker, obtain the connection relationship between each node, and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system.

[0101] The node-branch model establishment device for DC traction power supply system provided in this embodiment of the invention is based on the same technical concept as the node-branch model establishment method for DC traction power supply system provided in Embodiment 1, and can produce the beneficial effects described in Embodiment 1. For the contents not described in detail in this embodiment, please refer to Embodiment 1.

[0102] Example 3:

[0103] This invention provides a node-branch model building device for a DC traction power supply system, including a processor and a storage medium;

[0104] The storage medium is used to store instructions;

[0105] The processor is configured to operate according to instructions to perform steps according to any of the methods in Embodiment 1.

[0106] Example 4:

[0107] This invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods in Embodiment 1.

[0108] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0109] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0110] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0111] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0112] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for establishing a node-branch model of a DC traction power supply system, characterized in that, The method includes: A topology analysis was performed on the urban rail transit power supply system to obtain the topology information of the traction substation. Based on the topology information, the topology nodes of the traction substation are classified, and the topology nodes that meet the requirements for establishing the node model are selected according to the classification results. Based on the structural characteristics of the DC traction power supply system, the connection relationship between the selected topology nodes and the traction network is determined; Using traction calculation and flat running diagrams, the topology information of trains connected to the traction network is obtained, and each train is equivalent to two topology nodes; A node model is constructed using the selected topology nodes and the topology nodes corresponding to each train. By combining the connection relationship between the topological nodes and the traction network, the nodes in the node model are connected in order of their kilometer markers from smallest to largest to obtain the connection relationship between the nodes and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system. The topology information of the traction substation includes: The topology nodes contained within the traction substation; The connection relationship between the topology nodes contained in the traction substation and the traction network; Kilometer markers for traction substations; Among them, the kilometer marker of the traction substation serves as the location information of its topological node; The step of classifying the topology nodes of the traction substation based on the topology information includes: classifying the topology nodes of the traction substation into the following six categories according to the connection relationship between the topology nodes in the traction substation and the rectifier units and the traction network, and by defining the enumeration quantity DCTNODETYPE: allrecnode represents a topology node that can establish a connection with the positive terminals of two rectifier units within the traction substation; trecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 1 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 2. zrecnode represents a topology node that can establish a connection with the positive terminal of rectifier unit 2 in the traction substation but cannot establish a connection with the positive terminal of rectifier unit 1. ocsnode refers to a topology node that can establish a connection with the overhead contact line but cannot establish a connection with the positive terminal of the rectifier unit; negrecnode represents a topology node that can establish a connection with the negative terminal of the rectifier unit; railnode represents a topology node that can establish a connection with a rail, but cannot establish a connection with the negative terminal of a rectifier unit; The step of selecting the topology nodes that meet the requirements for establishing the node model based on the classification results includes: removing the topology nodes in the traction substation that are classified as ocsnode and railnode, and the remaining topology nodes are the topology nodes that meet the requirements for establishing the node model. The determination of the connection relationship between the selected topology nodes and the traction network includes: connecting to the left and right traction networks, connecting to the right traction network, connecting to the left traction network, and connecting to the right traction network; the "left" and "right" in the connection relationship are defined by the kilometer marker size of another traction substation connected to the traction network.

2. The method for establishing a node-branch model of a DC traction power supply system according to claim 1, characterized in that, The train's topology information includes: Types of train topology nodes; Injected current at train topology nodes; Location information of train topology nodes.

3. The method for establishing a node-branch model of a DC traction power supply system according to any one of claims 1 to 2, characterized in that, The steps for constructing a node model using the selected topology nodes and the topology nodes corresponding to each train include: Add the selected topology nodes to the node model; Determine whether the topology nodes corresponding to each train overlap with the topology nodes within the traction substation; If an overlap occurs, find the node in the node model that overlaps with the topological node in the traction substation, and superimpose the injected current of the train onto the overlapping node. If there is no overlap, the topology node corresponding to that train will be directly added to the node model.

4. A node-branch model establishment device for a DC traction power supply system, characterized in that, The apparatus for implementing the node-branch model establishment method of the DC traction power supply system according to any one of claims 1-3, the apparatus comprising: The topology analysis module is used to perform topology analysis on the urban rail transit power supply system to obtain the topology information of the traction substation. The classification and filtering module is used to classify the topology nodes of the traction substation based on the topology information, and filter out the topology nodes that meet the requirements for establishing the node model according to the classification results. The connection relationship determination module is used to determine the connection relationship between the selected topology nodes and the traction network based on the structural characteristics of the DC traction power supply system. The train topology information acquisition module is used to acquire the topology information of trains connected to the traction network by means of traction calculation and flat operation diagram, and to treat each train as two topology nodes. The node model building module is used to build a node model using the selected topology nodes and the topology nodes corresponding to each train. The node-branch model acquisition module is used to combine the connection relationship between the topological nodes and the traction network, connect each node in the node model in ascending order of its kilometer marker, obtain the connection relationship between each node, and determine the resistance of each branch, thereby obtaining the node-branch model of the DC traction power supply system.

5. A method and apparatus for establishing a node-branch model of a DC traction power supply system, characterized in that, Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the node-branch model establishment method for a DC traction power supply system according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the node-branch model establishment method for the DC traction power supply system as described in any one of claims 1 to 3.

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