A method for modeling and analyzing electrical circuits in substations

Abstract

A method for modeling and analyzing a substation electrical circuit. A method for modeling and analyzing a substation electrical circuit is provided to improve the digital expression and application efficiency of a substation secondary circuit. The method comprises the following steps: S1, defining a substation electrical circuit model; S2, establishing a substation electrical circuit model; S3, analyzing the substation electrical circuit model; S4, completion. The present invention realizes the modeling and analysis of electrical circuits, solves the problem of complex topological relationships of electrical circuits, changes the original way that substation electrical circuits can only be expressed in CAD drawings, improves the model system of substation secondary circuits, and greatly improves the digital expression and application efficiency of substation secondary circuits in the future.

Description

Technical Field

[0001] The invention relates to a substation secondary system, and in particular to a substation electric circuit modeling and analysis method. Background Art

[0002] Both conventional substations and smart substations involve a large number of electrical circuits. The traditional design and display methods are to draw CAD drawings. The topological relationship of the electrical circuit is complex and cannot be clearly modeled and expressed. In the design of optical fiber circuits in smart substations, modeling and analysis research has been carried out on primary wiring methods, secondary optical fiber physical connections, and virtual circuit signals, which are expressed using SSD files, SPCD files, and SCD files respectively. However, there is currently no corresponding solution for the modeling and analysis methods of secondary electrical circuits. Summary of the invention

[0003] In view of the above problems, the present invention provides a substation electrical circuit modeling and analysis method for improving the digital expression and application efficiency of the substation secondary circuit.

[0004] The technical solution of the present invention is: comprising the following steps:

[0005] S1. Define the substation electrical circuit model;

[0006] S2. Establishing the substation electrical circuit model;

[0007] S3, analyzing the substation electrical circuit model;

[0008] S4. Completed.

[0009] In step S1, the object model of the electrical circuit in the substation includes panels, devices, various components, terminals, nodes, wiring and short connectors within the panel, and cables between panels. The model file is expressed in XML format.

[0010] Step S2 includes the following steps:

[0011] S2.1. Establish the panel cabinet and device model. According to the panel cabinet and device configuration in the substation, establish the model, including the name and model attributes;

[0012] S2.2. Establish component models. According to the components configured in the cabinet, establish models including cabinet terminal blocks, circuit breakers, pressure plates, power supplies, indicator lights and sensors, including name and model attributes;

[0013] S2.3, establish a terminal model, and establish a model according to the number of terminals of the device and components;

[0014] S2.4, establish node model,

[0015] S2.41. Select the two terminals where you want to create nodes.

[0016] S2.42, select the node type, select a node type from open input, open output, analog input and power supply type, specify the two terminals of the node,

[0017] S2.43, complete node modeling;

[0018] S2.5. Establish an electrical circuit model.

[0019] S2.6. Complete the model; after all models are established, save the model file in XML format according to the defined substation electrical circuit model to complete the modeling.

[0020] In step S2.3, it also includes whether the device and components are on the board;

[0021] If it exists, establish the corresponding board information, including power supply, input, output, sampling and terminal segment board information;

[0022] If it does not exist, create default board information.

[0023] In step S2.41,

[0024] When there is an internal loop or relay between two terminals that can open or close them, the two terminals are defined as a secondary node;

[0025] When multiple terminals need to be defined as nodes with the same common terminal, multiple node information is created in the model.

[0026] Step S2.5 includes the following steps:

[0027] S2.51, select the positive terminal of the power node,

[0028] S2.52, create cables,

[0029] S2.53, select the terminal to be connected,

[0030] S2.54, when the connection terminal is the negative terminal of the power node, the modeling of a loop is completed;

[0031] S2.55, when the connection terminal is a terminal in a secondary node, select another terminal of the secondary node to continue modeling the remaining connections in the electrical circuit;

[0032] S2.56. When there are multiple paths in the electrical circuit between the nodes of a secondary power supply, repeat the operations between S2.52-S2.55 to establish multiple electrical circuit models;

[0033] S2.57, completed.

[0034] Step S3 includes the following steps:

[0035] S3.1. Analyze the electrical connection information.

[0036] S3.2, analyze the terminal and node information of the panel cabinet,

[0037] S3.3, search for electrical circuit information,

[0038] S3.4. Complete the analysis.

[0039] Step S3.1 includes the following steps:

[0040] S3.11. Analyze the substation electrical circuit model file, traverse all the cabinets therein, select each cabinet in turn, and analyze the electrical connection information according to the cabinet;

[0041] S3.12. According to each in-panel wiring and short connector, or inter-panel cable and its fiber core, record the terminal information on both sides of the in-panel wiring and short connector, and the panel cabinet cable fiber core.

[0042] Step S3.2 includes the following steps:

[0043] S3.21. Select each cabinet in turn, traverse all the terminals in the selected cabinet, and record their names;

[0044] S3.22. Traverse all node information in the panel cabinet, record the type of each sub-node and the names of the two terminals in the node.

[0045] Step S3.3 includes the following steps:

[0046] S3.31. Select and record a positive terminal of a power node.

[0047] S3.32, record the information of the opposite terminal to which the terminal is connected,

[0048] S3.33, when the opposite terminal is the negative terminal of the power node, a loop analysis is completed;

[0049] S3.34. If the opposite terminal does not belong to any node, use the opposite terminal name to search for the next level opposite terminal connected to it in the electrical connection information;

[0050] If the opposite terminal belongs to a node, then the name of another terminal in the node is obtained according to the node information, and the name of the other terminal is used to search for the next-level opposite terminal connected to it in the electrical connection information;

[0051] S3.35. When there are multiple records of the opposite terminal searched in the electrical connection information, repeat step S3.34 for each record.

[0052] In operation, the present invention defines a model format for the panels, devices, components, terminals, nodes and cables in the substation electrical circuit. Each sub-node in the electrical circuit needs to specify its type, including input, output, analog input and power supply. Each electrical circuit can only specify one power supply node as the starting point, so as to realize the modeling and analysis of the electrical circuit, solve the complex topological relationship of the electrical circuit, change the original way that the substation electrical circuit can only be expressed by CAD drawings, improve the model system of the substation secondary circuit, and greatly improve the digital expression and application efficiency of the substation secondary circuit in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a flow chart of the present invention,

[0054] Figure 2 is a flow chart modeled in the present invention,

[0055] Figure 3 It is a flowchart of the analysis in the present invention. DETAILED DESCRIPTION

[0056] The present invention Figure 1-3 As shown, the following steps are included:

[0057] S1. Define the substation electrical circuit model;

[0058] S2. Establishing the substation electrical circuit model;

[0059] S3, analyzing the substation electrical circuit model;

[0060] S4. Completed.

[0061] in,

[0062] S1. Define the substation electrical circuit model

[0063] 1) The object model of the power circuit in the substation includes the panel cabinet, device, various components, terminals, nodes, wiring and short connectors in the panel, and cables between panels. The model structure is expressed in XML format;

[0064] 2) The attributes of the cabinet and device models use the model attributes defined in the existing SPCD file;

[0065] 3) All kinds of component models are defined as UNIT elements in the SPCD file, with iedName being empty. In the class type attribute, add "TERMS-terminal row", "Enable-pressure plate", "AirSwitch-air switch", "Light-indicator light", "Button-button", "TransferSwitch-transfer switch", "Power-power supply" and other elements to represent the components and devices in the electrical circuit; for components that do not distinguish between boards, the slot number element of the board element is always "1". For terminal rows, the board element is used to describe each terminal segment in the terminal row;

[0066] 4) Terminal model: Terminals are used for connection in electrical circuits. Terminal models are defined as PORT elements in the SPCD file, with the direction attribute set to "RT-transmit / receive" and the plug attribute set to "none" direction.

[0067] 5) Node model: Add a new PNode sub-element under the Board element in the SPCD file to identify the node. Its attributes are defined as follows:

[0068] Property Name Attribute Description class Node category, enumeration value is DI-input node, DO-output node, AI-analog input node, PWR-power node desc Device description text portA Name of port A in the node portB Port B name in the node

[0069] 6) In-panel wiring and short-circuit model: The in-panel wiring and short-circuit used in the electrical circuit connection are defined as the IntCore element in the SPCD file. Add "DTX-electrical jumper" and "TLP-short-circuit" in the type jumper type attribute;

[0070] 7) Panel cable model: The panel cables used in the electrical circuit connection are defined as Cable and Core elements in the SPCD file. "DL-cable" is added to the type physical cable type attribute of the Cable element. The ports referenced by the portA and portB attributes in the Core element are the terminal models described under various component models.

[0071] S2. Establishing the substation electrical circuit model

[0072] The core of substation electrical circuit modeling is to create clear node types. The nodes are composed of two terminals, including open input, open output, modular input and power supply nodes. During the modeling process, the nodes or terminals in the device and various components are connected by cables to form a complete circuit, and each circuit is connected to a unique secondary power supply node to finally complete the modeling of the entire electrical circuit.

[0073] 1) Create cabinet and device models

[0074] According to the configuration of the panels and devices in the substation, establish the panel and device models, including the name, model and other attributes;

[0075] 2) Establish component model

[0076] According to the components configured in the cabinet, a component model is established, including the cabinet terminal block, circuit breaker, pressure plate, power supply, indicator light, sensor, transfer switch, etc. The model includes attributes such as name and model;

[0077] 3) Establish terminal model

[0078] Establish terminal models according to the number of terminals of devices and components;

[0079] A. For devices and components that distinguish between boards, first create the corresponding board information, such as power supply, input, output, sampling, terminal segment and other boards. For components that do not distinguish between boards, create one board by default;

[0080] B. Then create a terminal model on the board, including properties such as terminal name and serial number;

[0081] 4) Establish node model

[0082] A. When there is an internal loop or relay between two terminals that can open or close them, define the two terminals as a secondary node. When multiple terminals need to be defined as nodes with the same common terminal, create multiple node information in the model.

[0083] B. The two terminals in a node are connected by default during parsing, so it is necessary to define the node according to the depth of model expression. For example, when the secondary circuit of the device needs to be expressed by the model, the node can be established on the terminal of the device; when only the secondary circuit between the cabinets needs to be expressed by the model, the node can be established on the terminal of the terminal row;

[0084] C. Select a node type from the open input, open output, modular input and power supply types, specify the two terminals of the node, and complete the node modeling;

[0085] 5) Establish an electrical circuit model

[0086] Connect the electrical circuit model according to the design of the electrical circuit in the substation;

[0087] A. Select a power node at the starting point, such as a current or voltage type power node in a transformer junction box, a power node in a DC panel, or an input or output type power node in a control cabinet;

[0088] B. Start with the positive terminal of the power node and connect the terminals that the entire electrical circuit needs to pass through in sequence;

[0089] C. Create in-panel wiring and short connectors, inter-panel cables and their fiber cores according to the type of cable used between the two terminals, and use in-panel wiring, short connectors or cable cores to connect the terminals on both sides;

[0090] D. When the terminal connected to is the negative terminal in the power supply node at the starting point, the modeling of the entire electrical circuit is completed;

[0091] E. When the terminal connected to one side is a terminal in a secondary node, select another terminal of the secondary node to continue modeling the remaining connections in the electrical circuit;

[0092] F. When there are multiple paths in the electrical circuit between a pair of power supply nodes, repeat the operation between CEs to establish multiple electrical circuit models;

[0093] 6) Complete the model

[0094] After all models are established, the model files are saved as files in XML format according to the defined substation electrical circuit model to complete the modeling.

[0095] S3. Analytical substation electrical circuit model

[0096] When analyzing the substation electrical circuit model, each secondary power node is used as the starting point and end point of the circuit. It starts by automatically analyzing the positive pole of the power supply, identifying and recording each connected terminal in turn, and completing a complete electrical circuit analysis when it reaches the negative terminal of the power supply. This process is repeated and the entire substation electrical circuit model analysis is completed after all the circuits connecting the power nodes in the model are retrieved.

[0097] 1) Analyze electrical connection information

[0098] A. Analyze the substation electrical circuit model file, traverse all the cabinets in it, select each cabinet in turn, and analyze the electrical connection information according to the cabinet;

[0099] B. According to each in-panel wiring and short connector, or inter-panel cable and its fiber core, record the terminal information on both sides of the in-panel wiring and short connector, and the panel cabinet cable fiber core;

[0100] 2) Analyze the terminal and node information of the panel cabinet

[0101] A. Select each cabinet in turn, traverse all the terminals in the selected cabinet, and record their names;

[0102] B. Traverse all node information in the panel cabinet, record the type of each sub-node and the names of the two terminals in the node;

[0103] 3) Search for electrical circuit information

[0104] A. Select each cabinet in turn. If there is a power node in the cabinet, start searching from the positive terminal of the node.

[0105] B. Searching for information of the opposite terminal connected to the positive terminal in the electrical connection information;

[0106] C. When the opposite terminal found in the electrical connection information is the negative terminal in the starting power supply node, the electrical circuit search ends, and the name information of all terminals, nodes, in-panel wiring and short connectors, and panel cabinet cable cores that the electrical circuit passes through are recorded to complete the electrical circuit search;

[0107] D. If the opposite terminal does not belong to any node, use the opposite terminal name to search for the next-level opposite terminal connected to it in the electrical connection information; if the opposite terminal belongs to a node, then according to the node information, obtain the name of another terminal in the node, and use the other terminal name to search for the next-level opposite terminal connected to it in the electrical connection information;

[0108] E. When there are multiple records of the opposite terminal searched in the electrical connection information, repeat operation D for each record;

[0109] 4) Complete the parsing.

[0110] When the power supply nodes in all the cabinets have completed the electrical circuit search and recorded the name information of all the terminals, nodes, wiring in the panel and short connectors, and cable cores of the cabinets through which each electrical circuit passes, the analysis of the electrical circuit model of the entire substation is completed.

[0111] Regarding the contents disclosed in this case, there are a few points that need to be explained:

[0112] (1) The drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design;

[0113] (2) In the absence of conflict, the embodiments and features of the embodiments disclosed in this case may be combined with each other to obtain new embodiments;

[0114] The above are only specific implementation methods disclosed in this case, but the protection scope of the present disclosure is not limited thereto. The protection scope disclosed in this case should be based on the protection scope of the claims.

Claims

1. A substation electrical circuit modeling and analysis method, characterized in that: The following steps are involved: S1. Define the substation electrical circuit model; S2. Establishing the substation electrical circuit model; S3, analyzing the substation electrical circuit model; S4, completed; In step S1, the object model of the electrical circuit in the substation includes the panel cabinet, device, various components, terminals, nodes, wiring and short connectors in the panel, and cables between panels, and the model file is expressed in XML format; Step S2 includes the following steps: S2.

1. Establish the panel cabinet and device model. According to the panel cabinet and device configuration in the substation, establish the model, including the name and model attributes; S2.

2. Establish component models. According to the components configured in the cabinet, establish models including cabinet terminal blocks, circuit breakers, pressure plates, power supplies, indicator lights and sensors, including name and model attributes; S2.3, establish a terminal model, and establish a model according to the number of terminals of the device and components; S2.4, establish node model, S2.

41. Select the two terminals where you want to create nodes. S2.42, select the node type, select a node type from open input, open output, analog input and power supply type, specify the two terminals of the node, S2.43, complete node modeling; S2.

5. Establish an electrical circuit model. S2.6, complete the model; after all models are established, save the model file in XML format according to the defined substation electrical circuit model to complete the modeling; Step S2.5 includes the following steps: S2.51, select the positive terminal of the power node, S2.52, create cables, S2.53, select the terminal to be connected, S2.54, when the connection terminal is the negative terminal of the power node, the modeling of a loop is completed; S2.55, when the connection terminal is a terminal in a secondary node, select another terminal of the secondary node to continue modeling the remaining connections in the electrical circuit; S2.

56. When there are multiple paths in the electrical circuit between the nodes of a secondary power supply, repeat the operations between S2.52-S2.55 to establish multiple electrical circuit models; S2.57, completed; Step S3 includes the following steps: S3.

1. Analyze the electrical connection information. S3.2, analyze the terminal and node information of the panel cabinet, S3.3, search for electrical circuit information, S3.4, complete the analysis; Step S3.1 includes the following steps: S3.

11. Analyze the substation electrical circuit model file, traverse all the cabinets therein, select each cabinet in turn, and analyze the electrical connection information according to the cabinet; S3.

12. According to each in-panel wiring and short connector, or inter-panel cable and its fiber core, record the terminal information on both sides of the in-panel wiring and short connector, and the panel cabinet cable fiber core; Step S3.2 includes the following steps: S3.

21. Select each cabinet in turn, traverse all the terminals in the selected cabinet, and record their names; S3.22, traverse all node information in the panel cabinet, record the type of each sub-node and the names of the two terminals in the node; Step S3.3 includes the following steps: S3.

31. Select and record a positive terminal of a power node. S3.32, record the information of the opposite terminal to which the terminal is connected, S3.33, when the opposite terminal is the negative terminal of the power node, a loop analysis is completed; S3.

34. If the opposite terminal does not belong to any node, use the opposite terminal name to search for the next level opposite terminal connected to it in the electrical connection information; If the opposite terminal belongs to a node, then the name of another terminal in the node is obtained according to the node information, and the name of the other terminal is used to search for the next-level opposite terminal connected to it in the electrical connection information; S3.

35. When there are multiple records of the opposite terminal searched in the electrical connection information, repeat step S3.34 for each record.

2. A substation electrical circuit modeling and analysis method according to claim 1, characterized in that: In step S2.3, it also includes whether the device and components are on the board; If it exists, establish the corresponding board information, including power supply, input, output, sampling and terminal segment board information; If it does not exist, create the default board information.

3. A substation electrical circuit modeling and analysis method according to claim 1, characterized in that: In step S2.41, When there is an internal loop or relay between two terminals that can open or close them, the two terminals are defined as a secondary node; When multiple terminals need to be defined as nodes with the same common terminal, multiple node information is created in the model.

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