Graph technology-based power flow estimation method and apparatus for converter station, device, and medium

Abstract

The present application relates to a graph technology-based power flow estimation method and apparatus for a converter station, a device, and a medium. The method comprises: obtaining plant station data information of each plant station and equipment data information of each power equipment of each plant station in a target area; obtaining, from a graph database, plant station nodes corresponding to the plant stations and equipment nodes corresponding to the power equipment by using the plant station data information and the equipment data information; obtaining a target connection relationship among the nodes on the basis of plant station identifiers and an affiliation relationship; on the basis of the target connection relationship, obtaining all target equipment nodes directly connected with peer plant station nodes corresponding to peer plant stations, wherein the target equipment nodes are used for representing equipment nodes that are directly connected with the peer plant station nodes but are not directly connected with a target converter station node; and on the basis of power measurement corresponding to the target equipment nodes, obtaining exchange power of transmission between the peer plant stations and a target converter station. By adopting the method, the accuracy and efficiency of power flow estimation for a converter station can be improved.

Description

Converter station power flow estimation method, device, equipment and medium based on graph technology Technical Field

[0001] The present application relates to the technical field of power system flow calculation, and in particular to a converter station flow estimation method, device, equipment and medium based on graph technology. Background Art

[0002] Converter stations are a key component of power systems, converting high-voltage electricity to low-voltage energy suitable for transmission and distribution, or converting between different voltage levels. Converter stations are typically located at key nodes in the power system, connecting different power systems or grids for energy transmission.

[0003] Power flow estimation at converter stations provides information on the power being injected or output, helping power system operators understand system load conditions, line load conditions, and power flow distribution. This allows for optimal generator scheduling, load distribution, and network planning, ensuring safe, economical, and reliable operation of the power system. However, due to the unique nature of converter stations, data source systems and content differ from those of ordinary substations. This can lead to missing or inaccurate measurement data, reducing the accuracy of converter station power flow estimation results.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a converter station power flow estimation method, device, equipment and medium based on graph technology that can improve the accuracy of converter station power flow estimation in response to the above technical problems.

[0006] In a first aspect, the present application provides a method for estimating power flow in a converter station based on graph technology. The method comprises:

[0007] Obtaining plant data information of each plant in the target area and equipment data information of each power equipment under each plant. The plant data information includes the plant identification of each plant, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant in the target area includes the target converter station and the plant opposite the target converter station.

[0008] Using the plant data information and equipment data information, the plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment are obtained in the graph database, and the target connection relationship between each node is obtained according to the plant identification and subordinate relationship;

[0009] Based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and the device nodes that are not directly connected to the target converter station node.

[0010] In one embodiment, obtaining all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station includes:

[0011] Obtain all unit nodes in the device nodes directly connected to the opposite plant node and obtain the target unit node;

[0012] Obtain all load nodes in the equipment nodes directly connected to the opposite plant node and obtain the target load node;

[0013] Obtaining, from among the device nodes directly connected to the opposite plant station node, line nodes that are not directly connected to the target converter station node, to obtain the target line node;

[0014] Combine the target unit nodes, target load nodes and target line nodes to obtain all target equipment nodes.

[0015] In one embodiment, obtaining the exchange power transmitted between the opposite plant and the target converter station based on the power measurements corresponding to all target device nodes includes:

[0016] Obtaining power measurements corresponding to all target unit nodes, power measurements corresponding to all target load nodes, and power measurements corresponding to all target line nodes;

[0017] Subtract the power measurements corresponding to all target unit nodes from the power measurements corresponding to all target load nodes to obtain a subtraction result;

[0018] The difference result is subtracted from the power measurement corresponding to all target line nodes to obtain the exchange power transmitted between all opposite-end plants and the target converter station.

[0019] In one embodiment, before obtaining all target device nodes directly connected to all opposite-end plant nodes based on the target connection relationship, the method further includes:

[0020] Based on the target connection relationship, the second-order neighbor nodes of the target converter station node are obtained, and all the opposite-end plant station nodes are obtained.

[0021] In one embodiment, using the plant data information and the equipment data information to obtain plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment in a graph database includes:

[0022] Obtain the plant field information of each plant and station and the equipment field information of each power equipment;

[0023] Establish a plant node model in the graph database through the plant field information, and combine the plant node model and plant data information to obtain the plant nodes corresponding to each plant;

[0024] The device node model is established in the graph database through the device field information, and the device nodes corresponding to each power device are obtained by combining the device node model and the device data information.

[0025] In one embodiment, obtaining a target connection relationship between nodes according to the plant station identifier and the subordinate relationship includes:

[0026] Establishing a first initial connection relationship between the plant node model and the equipment node model, where the first initial connection relationship is used to represent the association between the plant identification field in the plant field information and the subordinate relationship field in the equipment field information;

[0027] The target connection relationship between the nodes is obtained by combining the first initial connection relationship, the plant station identifier and the subordinate relationship.

[0028] In one embodiment, obtaining the target connection relationship between the nodes according to the plant station identifier and the subordinate relationship further includes:

[0029] When establishing a plant station node model, for each plant station node pre-obtained through the plant station node model, a second initial connection relationship directly pointing to the pre-obtained plant station node is established, and the second initial connection relationship is used to represent the association between plants and stations corresponding to the pre-obtained plant station node;

[0030] According to the second initial connection relationship, the plant station identifier and the subordinate relationship, a target connection relationship between the nodes is obtained.

[0031] In a second aspect, the present application also provides a converter station power flow estimation device based on graph technology. The device includes:

[0032] An acquisition module is used to obtain plant station data information of each plant station in the target area and equipment data information of each power equipment under each plant station. The plant station data information includes the plant station identification of each plant station, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant station in the target area includes the target converter station and the plant station opposite the target converter station;

[0033] Establish a module for obtaining the plant nodes corresponding to each plant and the equipment nodes corresponding to each power equipment in the graph database using the plant data information and the equipment data information, and obtaining the target connection relationship between the nodes based on the plant identification and the subordinate relationship;

[0034] The estimation module is used to obtain all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station based on the target connection relationship, and obtain the exchange power transmitted between the opposite plant station and the target converter station based on the power measurement corresponding to all target device nodes. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and not directly connected to the target converter station node.

[0035] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are performed:

[0036] Obtaining plant data information of each plant in the target area and equipment data information of each power equipment under each plant. The plant data information includes the plant identification of each plant, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant in the target area includes the target converter station and the plant opposite the target converter station.

[0037] Using the plant data information and equipment data information, the plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment are obtained in the graph database, and the target connection relationship between each node is obtained according to the plant identification and subordinate relationship;

[0038] Based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and the device nodes that are not directly connected to the target converter station node.

[0039] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the following steps:

[0040] Obtaining plant data information of each plant in the target area and equipment data information of each power equipment under each plant. The plant data information includes the plant identification of each plant, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant in the target area includes the target converter station and the plant opposite the target converter station.

[0041] Using the plant data information and equipment data information, the plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment are obtained in the graph database, and the target connection relationship between each node is obtained according to the plant identification and subordinate relationship;

[0042] Based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and the device nodes that are not directly connected to the target converter station node.

[0043] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0044] Obtaining plant data information of each plant in the target area and equipment data information of each power equipment under each plant. The plant data information includes the plant identification of each plant, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant in the target area includes the target converter station and the plant opposite the target converter station.

[0045] Using the plant data information and equipment data information, the plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment are obtained in the graph database, and the target connection relationship between each node is obtained according to the plant identification and subordinate relationship;

[0046] Based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and the device nodes that are not directly connected to the target converter station node.

[0047] The above-mentioned converter station power flow estimation method, device, equipment and medium based on graph technology obtain the plant station data information of each plant station in the target area and the equipment data information of each power equipment under each plant station, the plant station data information includes the plant station identification of each plant station, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant station in the target area includes the target converter station and the opposite plant station of the target converter station; the plant station data information and equipment data information are used to obtain each plant station node corresponding to each plant station and each device node corresponding to each power equipment in the graph database, and the target connection relationship between each node is obtained according to the plant station identification and the subordinate relationship; based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained, and the exchange power is used to determine the line power flow of the target converter station, wherein the target device node is used to represent the device nodes that are not directly connected to the target converter station node among the device nodes directly connected to the opposite plant station node. The present application estimates the exchange power transmitted between the opposite plant station and the converter station by using the power measurement of the target device node directly connected to the opposite plant station node corresponding to the opposite plant station of the target converter station, thereby performing power flow estimation on the target converter station, avoiding the problem of missing or inaccurate measurement data related to the target converter station itself, and thereby improving the accuracy of the converter station power flow estimation.

[0048] Furthermore, with the development of new power markets, the data required for power grid analysis applications are more source-based and more extensive. The embodiment of the present application adopts graph technology. The query speed of the graph database is fast, and when the data volume is large, the data processing capability is faster. Graph calculation is used in the graph database to estimate the flow of the target converter station, avoiding the query of multi-level plant and equipment relationships, and the flow of the target converter station can be directly and quickly estimated. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG1 is a diagram showing an application environment of a converter station power flow estimation method based on graph technology in one embodiment;

[0050] FIG2 is a flow chart of a converter station power flow estimation method based on graph technology in one embodiment;

[0051] FIG3 is a schematic diagram showing the connection between each plant node and each device node in one embodiment;

[0052] FIG4 is a schematic diagram of a process for obtaining each plant node and each device node in another embodiment;

[0053] FIG5 is a schematic diagram of a process for obtaining a target connection relationship between nodes in another embodiment;

[0054] FIG6 is a schematic diagram showing connections between plant nodes and equipment nodes in another embodiment;

[0055] FIG7 is a structural block diagram of a converter station power flow estimation device based on graph technology in one embodiment;

[0056] FIG8 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0058] The converter station power flow estimation method based on graph technology provided in the embodiment of the present application can be applied to the application environment shown in Figure 1. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. The data storage system can store the device information and monitoring information of the transmission network equipment. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablets, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The server 104 can be implemented as an independent server or a server cluster consisting of multiple servers.

[0059] Power flow estimation is a critical task in power system operation, determining the steady-state and power information of each node in the system. Converter stations, used to achieve bidirectional energy conversion and transmission between different voltage levels, are widely used in large-scale power systems, ultra-high voltage transmission systems, and DC and AC / DC hybrid transmission systems. In these applications, converter stations have large capacities and complex operating conditions, making it easy for data source systems and data content to differ from those of ordinary substations. This often leads to missing or inaccurate measurement data, which reduces the accuracy of converter station power flow estimation.

[0060] To address the low accuracy of current converter station power flow estimation and the often complex and voluminous nature of power system data, embodiments of the present application provide a converter station power flow estimation method based on graph technology. This method utilizes graph database technology, a database based on graph theory that stores data in the form of graphs and describes the connections between data through node and edge relationships. Graph databases can be used to store and manage data on various plants, equipment, lines, and units, and implement power flow estimation through graph traversal and analysis.

[0061] In one embodiment, as shown in FIG2 , a method for estimating power flow in a converter station based on graph technology is provided. The method is described by applying it to the server in FIG1 as an example, including the following steps:

[0062] Step 202: Acquire plant data information of each plant in the target area and equipment data information of each power equipment under each plant.

[0063] The target area may refer to a designated area used to estimate the power flow at the target converter station. The power plants within the target area may include the target converter station, its opposite power plant, and other power plants connected to the opposite power plant of the target converter station. The opposite power plant of the target converter station refers to another power plant connected to the target converter station, used to transmit or exchange electrical energy with the target converter station, such as receiving AC or DC power output from the target converter station and further transmitting it to a target location or other power system. The opposite power plant of the target converter station may be another converter station, a substation, or other types of power stations.

[0064] The embodiment of the present application can obtain the plant station data information of each plant station in the target area. The plant station data information is used to characterize the specific data information of the plant station, such as the specific plant station identification of the plant station, the specific area to which the plant station belongs, the specific voltage level of the plant station, the specific plant station type of the plant station, the specific geographical location of the plant station, etc., wherein the plant station identification is unique, that is, the unique identification of the plant station.

[0065] The embodiment of the present application can also obtain equipment data information of each power equipment corresponding to each plant station, and the equipment data information is used to represent specific data information of the power equipment. In the power system, the power equipment corresponding to the plant station may include units, loads and lines.

[0066] For example, a unit's equipment data may include the unit's specific affiliation and specific power measurements. A unit's affiliation can be used to identify the plant to which the unit belongs, and its specific affiliation can refer to the plant identifier. A unit's power measurement can be used to identify the unit's output power, and its specific power measurement can refer to its specific output active power value. Furthermore, a unit's equipment data may include equipment identification, power estimate, voltage level, power generation type, and more.

[0067] For example, a load's device data information may include the load's specific affiliation and specific power measurement. The load's affiliation can be used to identify the plant to which the load belongs, and the specific affiliation can refer to the plant identifier of the plant to which the load belongs. The load's power measurement can be used to identify the load's power consumption, and the specific power measurement can refer to the load's specific active power consumption. Furthermore, the load's device data information may also include device identification, power estimation, voltage level, and more.

[0068] For another example, the equipment data information of a line may include the specific affiliation of the line and the specific power measurement of the line. The affiliation of the line can be used to characterize the starting plant station and the terminal plant station of the line. The specific affiliation of the line can refer to the plant station identification of the starting plant station of the line and the plant station identification of the terminal plant station. In other words, the line equipment connecting the two plants is commonly present in the power equipment corresponding to the connected plants stations; the power measurement of the line can be used to characterize the transmission power of the line. The specific power measurement of the line can refer to the active power value specifically transmitted by the line. In addition, the equipment data information of the line can also include equipment identification, power estimation, voltage level, line loss, capacity, etc.

[0069] Step 204 , using the plant data information and the equipment data information, obtain the plant nodes corresponding to each plant and the equipment nodes corresponding to each power equipment in the graph database, and obtain the target connection relationship between the nodes according to the plant identification and the subordinate relationship.

[0070] In the embodiment of the present application, a plant node is established in the graph database using plant data information, wherein one plant corresponds to one plant node, and the plant data information is stored in the plant node. A device node is established in the graph database using device data information, wherein one power device corresponds to one device node, and the device data information is stored in the device node.

[0071] The embodiment of the present application establishes a target connection relationship between each node based on the plant station identifier stored in each plant station node and the subordinate relationship stored in each equipment node. The target connection relationship can be represented by an edge in the graph data.

[0072] For example, in one case, each plant station may include the target converter station, the target converter station's opposite plant station substation 1, the target converter station's opposite plant station substation 2, the target converter station's opposite plant station substation 3, and the substation 4 connected to the opposite plant station substation 3; the power equipment corresponding to the target converter station may include unit 1, unit 2, load 1, load 2, line 1, line 2, and line 3; the power equipment corresponding to substation 1 may include unit 3, unit 4, load 3, load 4, and line 1; the power equipment corresponding to substation 2, substation 3, and substation 4 will not be repeated here.

[0073] Referring to Figure 3 , plant nodes are established in the graph database using the plant data of each plant, and device nodes are established in the graph database using the device data of each power device. Taking the target converter station and substation 1 as examples, the target converter station node is established in the graph database using the plant data of the target converter station, and the substation 1 node is established in the graph database using the plant data of substation 1. Furthermore, based on the plant identifiers stored in each plant node and the subordinate relationships stored in each device node, target connection relationships are established between each node. For example, if the subordinate relationship stored in the unit 5 node matches the plant identifier stored in the substation 2 node, an edge is established between the unit 5 node and the substation 2 node. For example, if the subordinate relationship stored in the line 2 node matches the plant identifier stored in the target converter station node and the plant identifier stored in the substation 2 node, edges are established between the line 2 node and the target converter station node and the substation 2 node, respectively.

[0074] It should be noted that, for the convenience of description, Figure 3 only illustrates the target converter station, substation 1, substation 2, substation 3, substation 4 and their corresponding power equipment. In the actual system, there may be more plants and power equipment, which will not be repeated here.

[0075] Step 206: Based on the target connection relationship, all target device nodes directly connected to the opposite plant node corresponding to the opposite plant are obtained, and based on the power measurement corresponding to the target device nodes, the exchange power transmitted between the opposite plant and the target converter station is obtained.

[0076] The target converter station node in the embodiment of the present application refers to the plant station node corresponding to the target converter station in the graph database, and the opposite plant station node refers to the plant station node corresponding to the opposite plant station of the target converter station in the graph database.

[0077] In one implementation, before determining the target device node, all opposite-end plant nodes can be obtained by obtaining the second-order neighbor nodes of the target converter station node based on the target connection relationship. In a graph database, a node's neighbor nodes can include first-order neighbors and second-order neighbors. First-order neighbors can be other nodes connected to the node via edges, and second-order neighbors can be other nodes connected to the node's first-order neighbors via edges, excluding the node itself and its first-order neighbors. It can be understood that by querying the second-order neighbor nodes of the target converter station, all opposite-end plant nodes can be quickly determined.

[0078] After obtaining the opposite plant node, all target device nodes directly connected to the opposite plant node can be obtained based on the target connection relationship, wherein the target device node is used to represent the device nodes directly connected to the opposite plant node and not directly connected to the target converter station node.

[0079] Exemplarily, based on the target connection relationship, all device nodes directly connected to the opposite plant node can be obtained to obtain all candidate device nodes, and then the device nodes directly connected to the target converter station node are eliminated from all candidate device nodes to obtain all target device nodes.

[0080] For example, please continue to refer to Figure 3. Taking the opposite-end plant substation 3 as an example, the equipment nodes directly connected to the substation 3 node include the unit 7 node, the unit 8 node, the load 7 node, the load 8 node, the line 3 node, the line 4 node, and the line 5 node. The line 3 node directly connected to the target converter station node is eliminated from the above candidate equipment nodes, and the target equipment nodes directly connected to the substation 3 node are obtained, namely the unit 7 node, the unit 8 node, the load 7 node, the load 8 node, the line 4 node, and the line 5 node.

[0081] After obtaining all target device nodes directly connected to the opposite plant station, the embodiment of the present application obtains the exchange power transmitted between the opposite plant station and the target converter station based on the power measurements corresponding to all target device nodes. The exchange power is used to determine the line flow of the target converter station. The exchange power transmitted between the opposite plant station and the target converter station can refer to the power sent by the opposite plant station to the target converter station, or it can refer to the power received by the opposite plant station from the target converter station.

[0082] For example, please continue to refer to Figure 3. Taking the opposite-end plant substation 3 as an example, based on the unit output power stored in the unit 7 node and the unit 8 node, the consumption power stored in the load 7 node and the load 8 node, and the power transmitted to the plant of other non-target converter stations stored in the line 4 node and the line 5 node, the exchange power transmitted between the substation 3 and the target converter station is obtained.

[0083] Furthermore, in one implementation, since electric energy may be lost during transmission in the line, the embodiment of the present application can obtain the line node between the opposite plant node and the target converter station node, and estimate the line flow on the target converter station side of the line by combining the line loss stored in the line node and the exchange power transmitted between the opposite plant and the target converter station.

[0084] Furthermore, in another implementation, the exchange power transmitted from all peer plants to the target converter station is aggregated to obtain the target converter station's total line flow. Based on this total line flow and the power consumption stored in the load nodes directly connected to the target converter station, the unit flow within the target converter station can be estimated.

[0085] Furthermore, in another implementation, the line flow estimation result of the target converter station can be compared with the line measurement of the target converter station itself. If the line flow estimation result of the target converter station is inconsistent with the line measurement of the target converter station itself, the line measurement of the target converter station itself may have missing data or inaccurate data, thereby verifying the accuracy of the line measurement of the target converter station itself.

[0086] In the above-mentioned converter station power flow estimation method based on graph technology, the plant station data information of each plant station in the target area and the equipment data information of each power equipment under each plant station are obtained. The plant station data information includes the plant station identification of each plant station, and the equipment data information includes the subordinate relationship and power measurement of each power equipment. Each plant station in the target area includes the target converter station and the opposite plant station of the target converter station; the plant station data information and the equipment data information are used to obtain each plant station node corresponding to each plant station and each device node corresponding to each power equipment in the graph database, and the target connection relationship between each node is obtained according to the plant station identification and the subordinate relationship; based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained. The exchange power is used to determine the line power flow of the target converter station, wherein the target device node is used to represent the device nodes that are not directly connected to the target converter station node among the device nodes directly connected to the opposite plant station node. In the embodiment of the present application, the power exchange power transmitted between the opposite plant station and the converter station is estimated by using the power measurement of the target device node directly connected to the opposite plant station node corresponding to the opposite plant station of the target converter station, thereby performing power flow estimation on the target converter station, avoiding the problem of missing or inaccurate measurement data related to the target converter station itself, and thereby improving the accuracy of the converter station power flow estimation.

[0087] Furthermore, with the development of new power markets, the data required for power grid analysis applications are more source-based and more extensive. The embodiment of the present application adopts graph technology. The query speed of the graph database is fast, and when the data volume is large, the data processing capability is faster. Graph calculation is used in the graph database to estimate the flow of the target converter station, avoiding the query of multi-level plant and equipment relationships, and the flow of the target converter station can be directly and quickly estimated.

[0088] In one embodiment, as shown in FIG4 , using the plant data information and the equipment data information to obtain plant nodes corresponding to each plant and equipment nodes corresponding to each power equipment in the graph database includes:

[0089] Step 402: Acquire the plant field information of each plant and the equipment field information of each power equipment.

[0090] Among them, the plant field information refers to the field corresponding to the plant data information, and the equipment field information refers to the field corresponding to the equipment data information. The field can also be understood as an attribute name.

[0091] For example, the plant data information may include the plant specific identification of the plant, the plant specific region, the plant specific voltage level, the plant specific type, and the plant specific geographical location. The plant field information may include attribute names such as the plant identification field, the region field, the voltage level field, the plant type field, the geographical location field, and the geographical location field.

[0092] In step 404, a plant node model is established in the graph database using the plant field information, and the plant node model and the plant data information are combined to obtain the plant nodes corresponding to each plant.

[0093] Before acquiring each plant node, the embodiment of the present application first establishes a plant node model in the graph database using the plant field information. After establishing the plant node model, the plant node model is instantiated using the plant data information corresponding to each plant, thereby generating each plant node.

[0094] For example, the plant node model can be represented as TopoND. By instantiating TopoND using the plant data information corresponding to the target converter station, a TopoND(i) node can be generated, and the TopoND(i) node represents the target converter station node; by instantiating TopoND using the plant data information corresponding to a certain opposite plant station, a TopoND(n) node can be generated, and the TopoND(n) node represents the opposite plant station node.

[0095] Step 406: Establish a device node model in the graph database using the device field information, and obtain each device node corresponding to each power device by combining the device node model and the device data information.

[0096] Before acquiring each device node, the embodiment of the present application first establishes a device node model in the graph database using the device field information. Different types of power equipment may have different corresponding device field information. Therefore, when establishing the device node model, a device node model can be constructed for each type of power equipment. For example, the device node model can include a unit node model, a load node model, and a line node model.

[0097] After establishing the device node model, the device node model is instantiated using the device data information corresponding to each power device to generate each device node. Specifically, the unit node model can be instantiated using the device data information corresponding to the unit to generate each unit node; the load node model can be instantiated using the device data information corresponding to the load to generate each load node; and the line node model can be instantiated using the device data information corresponding to the line to generate each line node.

[0098] For example, the unit node model can be expressed as unit, the load node model can be expressed as load, and the line node model can be expressed as line.

[0099] In addition, in the plant node model and the equipment node model, the data format of the pre-instantiated data of the field information can also be set. For example, the data format corresponding to the plant identification field is a string, the data format corresponding to the area field is a string, and the data format corresponding to the voltage level field is a double-precision floating point number.

[0100] This embodiment obtains the plant field information of each plant and the equipment field information of each power equipment, uses the plant field information to establish a plant node model in the graph database, and combines the plant node model and the plant data information to obtain each plant node corresponding to each plant, uses the equipment field information to establish a device node model in the graph database, and combines the device node model and the equipment data information to obtain each device node corresponding to each power equipment. By establishing a node model and importing specific data for instantiation, each plant node and device node can be quickly obtained.

[0101] In one embodiment, the target connection relationship between each node is obtained based on the plant site identification and the subordinate relationship, including: establishing a first initial connection relationship between the plant site node model and the device node model, and combining the first initial connection relationship, the plant site identification and the subordinate relationship to obtain the target connection relationship between each node.

[0102] The first initial connection relationship is used to represent the association between the plant identification field in the plant field information and the subordinate relationship field in the equipment field information.

[0103] In an embodiment of the present application, when creating a node model, a connection relationship can be established between the attribute fields of different node models, so that after data instantiation, nodes matching the connection relationship can be connected based on the connection relationship.

[0104] Exemplarily, a first initial connection relationship is established between the plant station identification field of the plant station field information in the plant station node model and the subordinate relationship field of the device field information in the device node model, that is, when the plant station identification stored in the instantiated plant station node and the subordinate relationship stored in the device node match, a target connection relationship is established between the plant station node and the device node.

[0105] In one embodiment, as shown in FIG5 , obtaining the target connection relationship between the nodes according to the plant station identifier and the subordinate relationship further includes:

[0106] Step 502 : When establishing the plant node model, for each plant node pre-obtained through the plant node model, a second initial connection relationship directly pointing to the pre-obtained plant node is established.

[0107] Step 504: Obtain a target connection relationship between the nodes according to the second initial connection relationship, the plant identifier and the subordinate relationship.

[0108] The second initial connection relationship is used to represent the association between the plants corresponding to the pre-obtained plant nodes.

[0109] Specifically, when creating a plant node model, the embodiment of the present application can set a second initial connection relationship in the plant node model that points other plant nodes to its own plant node, that is, each TopoND(x) plant node x instantiated through TopoND has edges from other plant nodes pointing to the plant node x itself.

[0110] In one implementation, a connected plant station identifier field can be set within the plant station field information of the plant station node model. The connected plant station identifier field indicates the identifiers of other plants to which a plant station is directly connected, and a second initial connection relationship is established between the other plants represented by the connected plant station identifier field and the plant station. In this case, the plant station data information includes a specific connected plant station identifier. After data instantiation, the target connection relationship between each plant station node is obtained based on the second initial connection relationship, the plant station identifier stored in each plant station node, and the connected plant station identifier stored in each plant station node.

[0111] For example, referring to Figure 6, the connection plant station identifier in the plant station data information of substation 3 in Figure 6 includes the plant station identifier of the target converter station, the plant station identifier of substation 2, and the plant station identifier of substation 4. After the data is instantiated, the target connection relationship between the substation 3 node and the target converter station node, the substation 2 node, and the substation 4 node is established based on the second initial connection relationship, the connection plant station identifier stored in the substation 3 node, and the plant station identifier stored in other plant station nodes.

[0112] In another implementation, a second initial connection relationship pointing to the pre-obtained plant node itself can be established in the plant node model based on the starting and ending plant nodes represented by the subordinate relationship field in the line node model. After data instantiation, the target connection relationship between each plant node is obtained based on the second initial connection relationship, the specific subordinate relationship stored in each line node, and the plant identifier stored in each plant node.

[0113] For example, referring to FIG6 , after data instantiation, based on the second initial connection relationship and the subordinate relationships stored in the line 1 node, line 2 node, line 3 node, line 4 node, and line 5 node, each plant station node is determined to point to its other end plant station node, and the target connection relationship between each node is obtained.

[0114] This embodiment establishes a second initial connection relationship directly pointing to each pre-obtained plant node for each plant node pre-obtained through the plant node model when establishing the plant node model. Based on the second initial connection relationship, the plant identifier, and the subordinate relationship, a target connection relationship between each plant node in the target connection relationship between each node is obtained. Thus, through the target connection relationship between each plant node, the opposite plant of the target converter station is directly obtained. Specifically, the opposite plant is a plant-type node among the directly connected nodes of the target converter station, or in other words, a plant-type node among the first-order neighbor nodes of the target converter station. In graph computation, this can be represented as TopoND(i)→TopoND(n), directly querying the opposite plant connected to the target converter station. After directly and quickly obtaining the opposite plant, the power flow of the target converter station can be estimated based on the power measurement of the target device node directly connected to the opposite plant. Specifically, the power flow of the target converter station is estimated based on the power measurement of the second-order neighbor nodes of the target converter station, further improving the efficiency of power flow estimation.

[0115] In one embodiment, all target equipment nodes directly connected to the opposite plant node corresponding to the opposite plant are obtained, including: obtaining all unit nodes in the equipment nodes directly connected to the opposite plant node to obtain the target unit node; obtaining all load nodes in the equipment nodes directly connected to the opposite plant node to obtain the target load node; obtaining the line nodes that are not directly connected to the target converter station node among the equipment nodes directly connected to the opposite plant node to obtain the target line node; combining the target unit nodes, target load nodes and target line nodes to obtain all target equipment nodes.

[0116] Specifically, in graph calculation, the unit node directly connected to the opposite plant can be quickly obtained through TopoND(n)→unit(j), the load node directly connected to the opposite plant can be quickly obtained through TopoND(i)→load(l), and the line node directly connected to the opposite plant can be quickly obtained through TopoND(i)→line(k).

[0117] In one embodiment, based on the power measurements corresponding to all target device nodes, obtaining the exchange power transmitted between the opposite power plant and the target converter station includes: obtaining the power measurements corresponding to all target unit nodes, the power measurements corresponding to all target load nodes, and the power measurements corresponding to all target line nodes. Subtracting the power measurements corresponding to all target unit nodes from the power measurements corresponding to all target load nodes to obtain a subtraction result. Subtracting the subtraction result from the power measurements corresponding to all target line nodes to obtain the exchange power transmitted between the opposite power plant and the target converter station.

[0118] Specifically, the exchange power transmitted between the opposite power plant and the target converter station can be calculated as shown in the following figure:

[0119] P line( n,i)=∑(P unit (n)-P load (n)-P line (n, j)), j∈n, j≠i;

[0120] Among them, P unit (n) represents the power measurement of the target unit node at the opposite plant n, P load (n) represents the power measurement P of the target load node at the opposite station n line (n, j) represents the power measurement of the target line node under the opposite plant n.

[0121] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0122] Based on the same inventive concept, embodiments of the present application further provide a graph-based converter station power flow estimation device for implementing the graph-based converter station power flow estimation method described above. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the graph-based converter station power flow estimation device provided below can be found in the limitations of the graph-based converter station power flow estimation method described above and are not further elaborated here.

[0123] In one embodiment, as shown in FIG7 , a converter station power flow estimation device based on graph technology is provided, comprising: an acquisition module 702 , an establishment module 704 , and an estimation module 706 , wherein:

[0124] Acquisition module 702 is configured to acquire plant data information of each plant in the target area and equipment data information of each power device under each plant. The plant data information includes the plant identification of each plant, and the equipment data information includes the subordinate relationship and power measurement of each power device. Each plant in the target area includes the target converter station and the plant station opposite the target converter station.

[0125] Establishing module 704, for obtaining each plant node corresponding to each plant and each device node corresponding to each power device in the graph database using the plant data information and the device data information, and obtaining a target connection relationship between each node based on the plant identifier and the subordinate relationship;

[0126] The estimation module 706 is used to obtain all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station based on the target connection relationship, and obtain the exchange power transmitted between the opposite plant station and the target converter station based on the power measurement corresponding to all target device nodes. The exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to represent the device nodes directly connected to the opposite plant station node and not directly connected to the target converter station node.

[0127] In one embodiment, when executing the acquisition of all target device nodes directly connected to the opposite plant node corresponding to the opposite plant, the estimation module 706 is configured to: acquire all unit nodes in the device nodes directly connected to the opposite plant node to obtain the target unit node; acquire all load nodes in the device nodes directly connected to the opposite plant node to obtain the target load node; acquire the line nodes that are not directly connected to the target converter station node among the device nodes directly connected to the opposite plant node to obtain the target line node; and obtain all target device nodes by combining the target unit nodes, target load nodes and target line nodes.

[0128] In one embodiment, when the estimation module 706 obtains the exchange power transmitted between the opposite plant and the target converter station based on the power measurement corresponding to all target device nodes, it is configured to: obtain the power measurement corresponding to all target unit nodes, the power measurement corresponding to all target load nodes, and the power measurement corresponding to all target line nodes; subtract the power measurement corresponding to all target unit nodes from the power measurement corresponding to all target load nodes to obtain a difference result; and subtract the difference result from the power measurement corresponding to all target line nodes to obtain the exchange power transmitted between all opposite plant and the target converter station.

[0129] In one embodiment, before executing the acquisition of all target device nodes directly connected to all opposite-end plant nodes based on the target connection relationship, the acquisition module 702 is configured to: acquire the second-order neighbor nodes of the target converter station node based on the target connection relationship to obtain all opposite-end plant nodes.

[0130] In one embodiment, when the establishment module 704 uses the plant data information and the equipment data information to obtain the plant station nodes corresponding to each plant station and the device nodes corresponding to each power equipment in the graph database, it is configured to: obtain the plant station field information of each plant station and the device field information of each power equipment; establish a plant station node model in the graph database through the plant station field information, and obtain the plant station nodes corresponding to each plant station in combination with the plant station node model and the plant data information; establish a device node model in the graph database through the device field information, and obtain the device nodes corresponding to each power equipment in combination with the device node model and the device data information.

[0131] In one embodiment, when the establishment module 704 obtains the target connection relationship between each node based on the plant site identification and the subordinate relationship, it is configured to: establish a first initial connection relationship between the plant site node model and the device node model, and the first initial connection relationship is used to characterize the association between the plant site identification field in the plant site field information and the subordinate relationship field in the device field information; combine the first initial connection relationship, the plant site identification and the subordinate relationship to obtain the target connection relationship between each node.

[0132] In one embodiment, when the establishment module 704 executes the process of obtaining the target connection relationship between each node based on the plant station identification and the subordinate relationship, it is configured as follows: when establishing the plant station node model, for each plant station node pre-obtained through the plant station node model, a second initial connection relationship directly pointing to the pre-obtained plant station node is established, and the second initial connection relationship is used to characterize the association between the plants corresponding to the pre-obtained plant station node; based on the second initial connection relationship, the plant station identification and the subordinate relationship, the target connection relationship between each node is obtained.

[0133] Each module in the graph-based converter station power flow estimation device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0134] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in Figure 8. The computer device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, memory, and I / O interface are connected via a system bus, and the communication interface is connected to the system bus via the I / O interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store plant and power equipment data. The I / O interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, a method for estimating power flow in a converter station based on graph technology is implemented.

[0135] Those skilled in the art will understand that the structure shown in FIG8 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0136] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0137] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0138] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0139] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions.

[0140] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0141] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A converter station power flow estimation method based on graph technology, characterized in that: The method comprises: Acquire plant station data information of each plant station in the target area and equipment data information of each power equipment under each plant station, wherein the plant station data information includes the plant station identification of each plant station, and the equipment data information includes the subordinate relationship and power measurement of each power equipment, and each plant station in the target area includes a target converter station and a plant station opposite to the target converter station; Using the plant data information and the equipment data information, obtaining plant nodes corresponding to the plants and equipment nodes corresponding to the power equipment in a graph database, and obtaining a target connection relationship between the nodes according to the plant identifier and the subordinate relationship; Based on the target connection relationship, all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station are obtained, and based on the power measurement corresponding to all the target device nodes, the exchange power transmitted between the opposite plant station and the target converter station is obtained, and the exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to characterize the device nodes that are not directly connected to the target converter station node among the device nodes directly connected to the opposite plant station node.

2. The method according to claim 1, characterized in that The acquiring all target device nodes directly connected to the opposite-end plant station node corresponding to the opposite-end plant station includes: Acquire all unit nodes in the device nodes directly connected to the opposite-end plant node to obtain the target unit node; Acquire all load nodes in the equipment nodes directly connected to the opposite-end plant node to obtain a target load node; Acquire a line node that is not directly connected to the target converter station node among the device nodes directly connected to the opposite-end plant station node, and obtain a target line node; Combine the target unit node, the target load node and the target line node to obtain all the target device nodes.

3. The method according to claim 2, characterized in that The obtaining, based on the power measurements corresponding to all the target device nodes, the exchange power transmitted between the opposite plant station and the target converter station includes: Obtaining power measurements corresponding to all of the target unit nodes, power measurements corresponding to all of the target load nodes, and power measurements corresponding to all of the target line nodes; Subtract the power measurements corresponding to all the target unit nodes from the power measurements corresponding to all the target load nodes to obtain a subtraction result; The difference result is subtracted from the power measurements corresponding to all the target line nodes to obtain the exchange power transmitted between all the opposite-end plants and the target converter station.

4. The method according to claim 1, characterized in that: Before acquiring all target device nodes directly connected to all opposite-end plant nodes based on the target connection relationship, the method further includes: Based on the target connection relationship, the second-order neighbor nodes of the target converter station node are acquired to obtain all the opposite-end plant station nodes.

5. The method according to claim 1, characterized in that The obtaining, in a graph database, each plant node corresponding to each plant and each device node corresponding to each power device by using the plant data information and the device data information includes: Acquire the plant field information of each plant and station and the equipment field information of each power equipment; Establishing a plant station node model in a graph database through the plant station field information, and obtaining plant station nodes corresponding to each plant station by combining the plant station node model and the plant station data information; A device node model is established in a graph database through the device field information, and the device nodes corresponding to the power devices are obtained by combining the device node model and the device data information.

6. The method according to claim 5, characterized in that The obtaining of the target connection relationship between the nodes according to the plant station identifier and the subordinate relationship includes: Establishing a first initial connection relationship between the plant node model and the device node model, wherein the first initial connection relationship is used to represent the association between the plant identification field in the plant field information and the subordinate relationship field in the device field information; Combine the first initial connection relationship, the plant station identifier and the subordinate relationship to obtain the target connection between each node. Connect relationship.

7. The method according to claim 6, characterized in that The step of obtaining the target connection relationship between the nodes according to the plant station identifier and the subordinate relationship further includes: When establishing the plant station node model, for each plant station node pre-obtained through the plant station node model, a second initial connection relationship directly pointing to the pre-obtained plant station node is established, and the second initial connection relationship is used to characterize the association between the plants corresponding to the pre-obtained plant station node; According to the second initial connection relationship, the plant site identifier and the subordinate relationship, a target connection relationship between the nodes is obtained.

8. A converter station power flow estimation device based on graph technology, characterized in that: The device comprises: An acquisition module, used to acquire plant station data information of each plant station in the target area and equipment data information of each power equipment under each plant station, wherein the plant station data information includes the plant station identification of each plant station, and the equipment data information includes the subordinate relationship and power measurement of each power equipment, and each plant station in the target area includes a target converter station and an opposite plant station of the target converter station; Establish a module for obtaining, in a graph database, each plant node corresponding to each plant and each device node corresponding to each power device using the plant data information and the device data information, and obtaining a target connection relationship between each node according to the plant identifier and the subordinate relationship; An estimation module is used to obtain all target device nodes directly connected to the opposite plant station node corresponding to the opposite plant station based on the target connection relationship, and obtain the exchange power transmitted between the opposite plant station and the target converter station based on the power measurement corresponding to all the target device nodes, and the exchange power is used to determine the line flow of the target converter station, wherein the target device node is used to characterize the device nodes directly connected to the opposite plant station node and not directly connected to the target converter station node.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images