Multi-path topology method for bearing capacity net rack of CIM / E power grid plant station

Abstract

The invention discloses a multi-path topology method for a bearing capacity net rack of a CIM / E power grid plant station. The method comprises the following steps: S1, reading equipment data in a CIM / E format line by line; s2, selecting a bearing capacity evaluation plant station in the region and determining a target voltage grade; s3, judging whether the voltage grade of the winding on the high-voltage side is consistent with the target voltage grade or not when all windings of all transformers in the topological plant station reach buses with the same voltage grade; s4, topology is carried out from the bus to all the overhead conductors, and the types of connection stations at the other ends of the overhead conductors are judged; and S5, summarizing single-path topology results in a hierarchical manner according to the topology sequence and the voltage grades to obtain a complete plant station bearing capacity net rack. According to the method, each transformer winding of a target plant station is taken as a starting point for topology to a bus with the same voltage grade, all overhead conductors connected through bus topology are taken to a subordinate plant station, then each transformer winding of the subordinate plant station is taken as a starting point for topology, and finally single-path topology results are summarized to form the multi-path topology of the bearing capacity analysis net rack of the target plant station.

Description

Technical Field

[0001] The present invention relates to the field of smart power supply technology, and in particular to a method for multi-channel topology of a CIM / E power grid plant load-bearing capacity grid. Background Art

[0002] CIM is an abstract model that uses object classes and attributes to describe all the main objects of a power enterprise and the relationships between them, and represents the public information of power system resources. E language uses special symbols and description syntax to achieve efficient description of various data models in the power system, with three data description methods: meter type, single column type and multi-column type.

[0003] CIM / E is a data file that organizes the related equipment attributes of the physical model of the power grid according to the E format specification. It contains various types of physical connection model objects of the power grid, such as area, load, bay, plant, transformer, bus section, reference voltage, overhead wire, etc., and the attribute items contained in each object have relevant requirements. In order to adapt to the graphic exchange between different systems, the model data of the graphics in the power grid has been generally described by CIM / E.

[0004] The plant-station bearing capacity grid is the topological relationship of the various levels of low-voltage plant-station lines connected by the plant-station through overhead wires in the power supply area, including the plant-station transformers, busbars and overhead wires in the lines. Most of the existing plant-station bearing capacity grids in the power grid are obtained by manually analyzing the plant-station connection relationship in the area. With the development of distributed new energy such as photovoltaic and wind power, the access of distributed power sources to the power grid requires grid bearing capacity assessment, and it is expected to quickly obtain the bearing capacity grid of any plant-station and target voltage level in the area. Therefore, the study of efficiently obtaining the plant-station bearing capacity grid based on CIM / E multi-channel topology to improve the efficiency of bearing capacity analysis has a wide range of practical application value.

[0005] The current research on the bearing capacity grid of power plants and stations mainly includes the following methods: manually collecting the primary wiring diagram of power plants and stations in the region, checking the busbars of each voltage level and manually analyzing the in-and-out overhead wires, and topologically analyzing the CIM / E data in the region with the high-voltage side busbar of the target power plant as the starting point. To manually analyze the relationship between the incoming and outgoing lines of power plants and stations of different voltage levels in the region, it is necessary to collect the primary wiring diagrams of all power plants and stations in the region, and check the line connection relationship from the incoming and outgoing lines of the busbars of each voltage level of the target power plant one by one. This work consumes a lot of manpower and is prone to omissions of power plants and stations; the regional CIM / E data is topologically topologically topologically based on the high-voltage side busbar of the target power plant. When topologically analyzing the connection relationship of the equipment, the full amount of equipment is required. Since the power grid is a mesh connection relationship, many topological analyses will form loops in the process. If T-type wiring and Π-type wiring are encountered, the topology will fail, and the existing topological rules need to be adjusted. This kind of topological analysis is inefficient. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the prior art and propose a method for multi-channel topology of a CIM / E power grid plant and station bearing capacity grid. The method is based on the CIM / E model data of the power grid in the power supply area, and analyzes the power equipment such as terminal blocks, overhead wires, plants and stations, busbars, transformers, transformer windings, switches, grounding switches, loads, etc. stored in the data. The topology is carried out from the windings of each transformer of the target plant and station to the busbar of the same voltage level, and all the overhead wires connected by the busbar topology are connected to the lower plant and station. Then, the topology is carried out from the windings of each transformer of the lower plant and station as the starting point. After the topology is completed, the single-channel topology results are summarized to form a multi-channel topology of the target plant and station bearing capacity analysis grid.

[0007] The present invention discloses a method for CIM / E power grid plant load-bearing capacity grid multi-channel topology, comprising the following steps:

[0008] S1. Segment the regional power grid equipment data by equipment type in CIM / E format, read the equipment data line by line, and build a relational equipment data structure that is convenient for topology;

[0009] S2. Evaluate the carrying capacity of power plants and stations in the selected area and determine the target voltage level;

[0010] S3. Connect all transformer windings in the topology plant to the busbar with the same voltage level to determine whether the voltage level of the high-voltage side winding is consistent with the target voltage level;

[0011] S3.1 If the voltage levels are consistent, the topology of this route is marked as finished, and the topology results are saved for subsequent aggregation;

[0012] S3.2 If it is higher than the target voltage level, the topology continues from the busbar to the overhead conductor;

[0013] S4. Overhead conductors are conductors that connect high-voltage plants and substations to low-voltage plants and substations. That is, when the target voltage level is determined as S3.2, the busbars on the medium and low voltage sides of the high-voltage plant and substation are connected to multiple overhead conductors at the same time, and the conductors are connected to different plants and substations respectively; from the busbar topology to all overhead conductors, the type of station connected to the other end of the overhead conductor is determined;

[0014] S5. After all single-circuit topologies are completed, the single-circuit topology results are summarized hierarchically according to the topological order and voltage level to obtain a complete plant and station bearing capacity grid.

[0015] Preferably, in step S1, the device topology connection relationship in the device data in CIM / E format is identified by I_node and J_node attributes, wherein the single-terminal device uses the I_node attribute to identify the connection target device, and the double-terminal device uses the I_node and J_node attributes to identify the connection target device respectively; the busbar and transformer winding are single-terminal devices and are identified by the I_node attribute.

[0016] Preferably, in step S2, a multi-way topology is started simultaneously with all the windings of all transformers in the target plant as the starting point, and the topology reaches the double-terminal devices of the circuit breaker and the knife switch. The target connection device is searched according to the other terminal to continue the topology, and the topology stops when it reaches a single terminal such as the grounding knife switch and the load, until the topology reaches the bus with the same voltage level as the windings of the transformer.

[0017] Preferably, in step S3, when judging whether the high voltage level of the plant station is consistent with the target voltage level, if they are consistent, stop this topology and save the topology result; if it is higher than the target voltage level, continue the topology to all connected overhead wires through the medium and low voltage busbars, and determine the type of the lower station by the other terminal of the overhead wire.

[0018] Preferably, in step S4, the type of connection station at the other end of the overhead wire and the processing method are:

[0019] A. If connected to a plant station, continue to open the topology according to the plant station topology rules;

[0020] B. If a virtual station is connected, the line is marked as T-type connection or Π-type connection, and the other end of the overhead wire of the virtual station terminal is connected to the plant station with the terminal topology, and the multi-channel topology is opened according to the plant station topology rules;

[0021] C. If other types of stations are connected, stop this topology.

[0022] Preferably, after the multi-way topology of step S5 is completed, the plant, transformer, transformer winding, busbar and overhead wire in the single-way topology result saved in the topology process are summarized according to the topological level and voltage level relationship to complete the plant bearing capacity grid; combined with automatic mapping technology, the plant bearing capacity grid diagram can be automatically drawn based on this topology data.

[0023] The advantages and technical effects of the present invention are:

[0024] 1. The multi-channel topology of the present invention fully describes the target plant and station bearing capacity grid data structure in a tree structure, and describes the topology as a multi-channel topology with the transformer windings of the target plant and station for bearing capacity assessment as the starting point topology to the busbar of the same voltage level, the overhead wire topology connected to the busbar to the lower plant and station, and then the transformer windings of the lower plant and station as the starting point topology. The multi-channel topology is not limited to the bearing capacity grid level, plant and station voltage level, plant and station transformer and bus number, target voltage level, power grid T-type connection and Π-type connection mode, and can be applied to the general plant and station bearing capacity grid topology.

[0025] 2. The multi-channel topology starts from the transformer winding of the plant station. The single-channel topology equipment is only the equipment in the plant station, which simplifies the scope of the simple-channel topology equipment. The plant station equipment has a clear identification of the plant station to which it belongs, and the topology efficiency is greatly improved. The T-type and Π-type connections of the power grid are classified and processed, and the topological methods for processing different connection methods are determined, which has a wider scope of application.

[0026] 3. Multi-channel topology splits the entire capacity grid topology into different levels of plant topology, and can use computer CPU multi-core to enable multi-threading and multi-tasking to improve topology efficiency. In some super-large and complex power grid capacity assessment grids with a large number of devices, distributed computing technology can be used to further improve topology efficiency.

[0027] 4. If the plant and station equipment in the area has not been updated, the plant and station topology results can be temporarily stored and directly used for the subsequent summary of other bearing capacity grid topologies, saving secondary topology time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the method of the present invention;

[0029] Figure 2 A schematic diagram of a single-circuit topology result of a three-winding transformer in the present invention;

[0030] Figure 3 A schematic diagram of a single-circuit topology result of a dual-winding transformer in the present invention;

[0031] Figure 4 It is a schematic diagram of the topological result of the busbar connected to the overhead conductor in the present invention;

[0032] Figure 5 It is a schematic diagram of the topological results of the plant load-bearing capacity grid in the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and cannot be understood as limiting the invention.

[0034] The present invention discloses a method for CIM / E power grid plant load-bearing capacity grid multi-channel topology, comprising the following steps:

[0035] S1. Segment the regional power grid equipment data by equipment type in CIM / E format, read the equipment data line by line, and build a relational equipment data structure that is convenient for topology;

[0036] S2. Evaluate the carrying capacity of power plants and stations in the selected area and determine the target voltage level;

[0037] S3. Connect all transformer windings in the topology plant to the busbar with the same voltage level to determine whether the voltage level of the high-voltage side winding is consistent with the target voltage level;

[0038] S3.1 If the voltage levels are consistent, the topology of this route is marked as finished, and the topology results are saved for subsequent aggregation;

[0039] S3.2 If it is higher than the target voltage level, the topology continues from the busbar to the overhead conductor;

[0040] S4. Overhead conductors are conductors that connect high-voltage plants and substations to low-voltage plants and substations. That is, when the target voltage level is determined as S3.2, the busbars on the medium and low voltage sides of the high-voltage plant and substation are connected to multiple overhead conductors at the same time, and the conductors are connected to different plants and substations respectively; from the busbar topology to all overhead conductors, the type of station connected to the other end of the overhead conductor is determined;

[0041] S5. After all single-circuit topologies are completed, the single-circuit topology results are summarized hierarchically according to the topological order and voltage level to obtain a complete plant and station bearing capacity grid.

[0042] Preferably, the grid multi-way topology method uses the transformer windings of the target plant as the starting point to topology to the bus of the same voltage level, and then connects all the overhead wires connected by the bus topology to the lower-level plant, and then uses the transformer windings of the lower-level plant as the starting point to perform topology. After the topology is completed, the single-way topology results are summarized to form a multi-way topology of the target plant's carrying capacity analysis grid.

[0043] Preferably, in step S1, the device topology connection relationship in the device data in CIM / E format is identified by I_node and J_node attributes, wherein the single-terminal device uses the I_node attribute to identify the connection target device, and the double-terminal device uses the I_node and J_node attributes to identify the connection target device respectively; the busbar and transformer winding are single-terminal devices and are identified by the I_node attribute.

[0044] Preferably, in step S2, a multi-way topology is started simultaneously with all the windings of all transformers in the target plant as the starting point, and the topology reaches the double-terminal devices of the circuit breaker and the knife switch. The target connection device is searched according to the other terminal to continue the topology, and the topology stops when it reaches a single terminal such as the grounding knife switch and the load, until the topology reaches the bus with the same voltage level as the windings of the transformer.

[0045] Preferably, in step S3, when judging whether the high voltage level of the plant station is consistent with the target voltage level, if they are consistent, stop this topology and save the topology result; if it is higher than the target voltage level, continue the topology to all connected overhead wires through the medium and low voltage busbars, and determine the type of the lower station by the other terminal of the overhead wire.

[0046] Preferably, in step S4, the type of connection station at the other end of the overhead wire and the processing method are:

[0047] A. If connected to a plant station, continue to open the topology according to the plant station topology rules;

[0048] B. If a virtual station is connected, the line is marked as T-type connection or Π-type connection, and the other end of the overhead wire of the virtual station terminal is connected to the plant station with the terminal topology, and the multi-channel topology is opened according to the plant station topology rules;

[0049] C. If other types of stations are connected, stop this topology.

[0050] Preferably, after the multi-way topology of step S5 is completed, the plant, transformer, transformer winding, busbar and overhead wire in the single-way topology result saved in the topology process are summarized according to the topological level and voltage level relationship to complete the plant bearing capacity grid; combined with automatic mapping technology, the plant bearing capacity grid diagram can be automatically drawn based on this topology data.

[0051] In order to more clearly illustrate the specific implementation mode of the present invention, an embodiment is provided below:

[0052] The present invention parses the CIM / E data of the power grid in the region, selects the power plant for capacity assessment and determines the target voltage level, and establishes a complete power plant capacity grid after multi-channel topology. Take the windings of each transformer in the power plant as the starting point and topology to the bus with the same voltage level to determine whether the voltage level on the high-voltage side is consistent with the target voltage level. If the voltage level is consistent, save the topology result. If it is higher than the target voltage level, continue the topology from the bus to the overhead wire to determine the type of connection station of the overhead wire terminal. If the connection station is a power plant, open the multi-channel topology according to the power plant rules. If the connection station is a virtual station, the topology of this virtual station connects all power plants and opens the multi-channel topology according to the power plant rules. If it connects other types of stations, stop this topology. After the multi-channel topology is completed, the single-channel topology results are summarized according to the hierarchy and voltage level to obtain a complete power plant capacity grid. The process is as follows Figure 1 shown.

[0053] S1. Segment the regional power grid equipment data by equipment type in CIM / E format, read the equipment data line by line to build a relational equipment data structure that is convenient for topology.

[0054] S2. Select the power plant for capacity assessment in the region and determine the target voltage level. The power plant for capacity assessment is usually a higher voltage level power plant, such as a 220kV voltage level power plant in the region, and the target voltage level is a lower voltage level, such as the 10kV voltage difference between the main network and the distribution network in the power grid as the target voltage level.

[0055] S3. Topology: Connect all transformer windings in the plant to the busbar with the same voltage level to determine whether the voltage level of the high-voltage side winding is consistent with the target voltage level. If the voltage levels are consistent, the topology of this line is marked as finished and the topology results are saved for subsequent summary. If the voltage level is higher than the target voltage level, the topology continues from the busbar to the overhead conductor. The topology results of a single line of a three-winding transformer are as follows: Figure 2 As shown, the result of the single-circuit topology of the dual-winding transformer is as follows Figure 3 shown.

[0056] S4. Overhead conductors are conductors that connect high-voltage plants and stations to low-voltage plants and stations. The busbars on the medium and low voltage sides of high-voltage plants and stations are connected to multiple overhead conductors at the same time, and the conductors are connected to different plants and stations respectively. From the busbar topology to all overhead conductors, determine the type of station connected to the other end of the overhead conductor. If it is connected to a plant station, continue to open the topology according to the plant station topology rules. If it is connected to a virtual station, the topology virtual station is connected to all plants and stations, and then continue to open the topology according to the plant station topology rules. If it is connected to other types of stations, stop this topology. Busbar connection overhead conductors such as Figure 4 shown.

[0057] S5. After all single-line topologies are completed, the single-line topology results are summarized hierarchically according to the topological order and voltage level to obtain a complete plant and station bearing capacity grid. Figure 5 shown.

[0058] Finally, all the parts not described in the present invention adopt mature products and mature technical means in the prior art.

[0059] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the embodiment or example of the invention.

[0060] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for multi-channel topology of CIM / E power grid plant load-bearing capacity grid, characterized in that: The following steps are involved: S1. Segment the regional power grid equipment data by equipment type in CIM / E format, read the equipment data line by line, and build a relational equipment data structure that is convenient for topology; S2. Evaluate the carrying capacity of power plants and stations in the selected area and determine the target voltage level; S3. Connect all transformer windings in the topology plant to the busbar with the same voltage level to determine whether the voltage level of the high-voltage side winding is consistent with the target voltage level; S3.1 If the voltage levels are consistent, the topology of this route is marked as finished, and the topology results are saved for subsequent aggregation; S3.2 If it is higher than the target voltage level, the topology continues from the busbar to the overhead conductor; S4. Overhead conductors are conductors that connect high-voltage plants and substations to low-voltage plants and substations. That is, when the target voltage level is determined as S3.2, the busbars on the medium and low voltage sides of the high-voltage plant and substation are connected to multiple overhead conductors at the same time, and the conductors are connected to different plants and substations respectively; from the busbar topology to all overhead conductors, the type of station connected to the other end of the overhead conductor is determined; S5. After all single-circuit topologies are completed, the single-circuit topology results are summarized hierarchically according to the topological order and voltage level to obtain a complete plant and station bearing capacity grid.

2. A method for multi-channel topology of CIM / E power grid plant load-bearing capacity grid frame according to claim 1, characterized in that: In step S1, the device topology connection relationship in the device data in CIM / E format is identified by I_node and J_node attributes, wherein the single-terminal device uses the I_node attribute to identify the connection target device, and the double-terminal device uses the I_node and J_node attributes to identify the connection target device respectively; the busbar and transformer winding are single-terminal devices and are identified by the I_node attribute.

3. The method of multi-channel topology of a CIM / E power grid plant load-bearing capacity grid according to claim 1, characterized in that: In step S2, a multi-channel topology is started simultaneously with all the windings of all transformers in the target plant as the starting point, and the topology is connected to the double-terminal devices of the circuit breaker and the knife switch. The target connection device is searched according to the other terminal to continue the topology. The topology stops when it reaches a single terminal such as the grounding knife switch and the load, until the topology reaches the bus with the same voltage level as the windings of the transformer.

4. The method of CIM / E power grid plant load-bearing capacity grid multi-channel topology according to claim 1, characterized in that: In step S3, when judging whether the high voltage level of the plant station is consistent with the target voltage level, if they are consistent, stop the topology of this line and save the topology result; if it is higher than the target voltage level, continue the topology to all connected overhead wires through the medium and low voltage busbars, and determine the type of the lower station by the other terminal of the overhead wire.

5. The method of CIM / E power grid plant load-bearing capacity grid multi-channel topology according to claim 1, characterized in that: In step S4, the type of connection station at the other end of the overhead wire and the processing method are: A. If connected to a plant station, continue to open the topology according to the plant station topology rules; B. If a virtual station is connected, the line is marked as T-type connection or Π-type connection, and the other end of the overhead wire of the virtual station terminal is connected to the plant station with the terminal topology, and the multi-channel topology is opened according to the plant station topology rules; C. If other types of stations are connected, stop this topology.

6. The method of multi-channel topology of a CIM / E power grid plant load-bearing capacity frame according to claim 1, characterized in that: After the multi-channel topology of step S5 is completed, the plant, transformer, transformer winding, busbar and overhead wire in the single-channel topology result saved in the topology process are summarized according to the topological level and voltage level relationship to complete the plant bearing capacity grid; combined with automatic mapping technology, the plant bearing capacity grid diagram can be automatically drawn based on this topological data.

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