Line load rate determination method and device, storage medium and electronic equipment

Abstract

The invention discloses a line load rate determination method and device, a storage medium and electronic equipment. The method comprises the steps that a T contact existing in a power grid is determined, and the T contact is a contact where a branch line is led out from a main line in the power grid; under the condition that the number of the T contacts is multiple, a preset processing mode is adopted, T contact end currents corresponding to the multiple T contacts are obtained, the preset processing mode is a mode that the T contact end current of the next T contact is determined based on the T contact end current of the previous T contact, and a preset T connection line segmentation sequence exists among the multiple T contacts; the plurality of T contacts divide the main line into a plurality of branch lines; and determining load rates corresponding to the plurality of branch lines based on the T contact end currents corresponding to the plurality of T contacts. According to the invention, the technical problem of large limitation of a line load rate acquisition mode in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a method, device, storage medium and electronic device for determining a line load rate. Background Art

[0002] In recent years, with the rapid development of power systems and the accelerated construction of new power systems based on new energy, some key control functions in the existing dispatching automation system can no longer meet the latest technical standards of smart grid dispatching technology and the actual needs of lean management of control and operation, and urgently need to be optimized and improved.

[0003] Limited by planning conditions and construction costs, 35kV (kilovolt) and above distribution networks have adopted a large number of segmented T-connection wiring methods. In related technologies, many existing substation incoming line measurement devices are insufficiently configured, resulting in the inability to grasp the load rate of some segmented lines in real time, which has caused great obstacles to the real-time perception of the operating status of 35kV and above power grids, online analysis of operating risks, and intelligent generation of auxiliary strategies, resulting in a high dependence on hardware detection devices and difficulty in obtaining line load rates.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a method, device, storage medium and electronic device for determining a line load rate, so as to at least solve the technical problem that the method for obtaining the line load rate in the related art is very limited.

[0006] According to one aspect of an embodiment of the present application, a method for determining a line load rate is provided, comprising: determining a T-contact existing in a power grid, wherein the T-contact is a contact point for leading a branch line from a main line in the power grid; in the case where there are multiple T-contacts, adopting a predetermined processing method to obtain T-contact terminal currents corresponding to multiple T-contacts respectively, wherein the predetermined processing method is a method for determining the T-contact terminal current of a subsequent T-contact based on the T-contact terminal current of a previous T-contact, and there is a predetermined T-contact line segmentation order between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; based on the T-contact terminal currents corresponding to the multiple T-contacts respectively, determining the load rates corresponding to the multiple branch lines respectively.

[0007] Optionally, the predetermined processing method is adopted to obtain the T-contact terminal currents corresponding to multiple T-contacts, including: determining a starting point among the multiple T-contacts as the previous T-contact; based on the segmentation order of the T-contact line, determining the next T-contact after the starting point as the next T-contact; based on the T-contact terminal current corresponding to the starting point and the power data of the next plant station connected to the next T-contact, determining the T-contact terminal current corresponding to the next T-contact; adopting the method of determining the T-contact terminal current corresponding to the next T-contact to obtain the T-contact terminal currents corresponding to the multiple T-contacts.

[0008] Optionally, the power data includes active power and current value, and the T-contact terminal current corresponding to the next T-contact is determined based on the T-contact terminal current corresponding to the starting point and the power data of the next plant connected to the next T-contact, including: adjusting the current value positively or negatively based on the positive or negative condition of the active power of the next plant to obtain an adjusted current value; determining the T-contact terminal current corresponding to the next T-contact based on the T-contact terminal current corresponding to the starting point and the adjusted current value.

[0009] Optionally, the method further includes: when the power data of the next plant station is missing, terminating the calculation processing of the T-contact terminal current corresponding to the next T-contact.

[0010] Optionally, determining the starting point among multiple T-junctions includes: determining the plant station connection status corresponding to the multiple T-junctions respectively; and among the multiple T-junctions, determining the plant station connection status indicating that two plant stations are connected as the starting point.

[0011] Optionally, determining the load rates corresponding to the multiple branch lines respectively based on the T-contact end currents corresponding to the multiple T-contacts respectively includes: determining the maximum current-carrying values ​​corresponding to the multiple branch lines respectively; determining the load rates corresponding to the multiple branch lines respectively based on the maximum current-carrying values ​​corresponding to the multiple branch lines respectively and the T-contact end currents corresponding to the multiple T-contacts respectively.

[0012] Optionally, the method further includes: determining a maximum load rate among the load rates corresponding to the multiple branch lines respectively; and using the maximum load rate as the load rate of the main line.

[0013] According to another aspect of an embodiment of the present application, a line load rate determination device is provided, comprising: a first determination module, used to determine a T-contact existing in a power grid, wherein the T-contact is a contact point where a branch line is derived from a main line in the power grid; a calculation and processing module, used to, when there are multiple T-contacts, adopt a predetermined processing method to obtain T-contact terminal currents corresponding to multiple T-contacts respectively, wherein the predetermined processing method is a method of determining the T-contact terminal current of a subsequent T-contact based on the T-contact terminal current of a previous T-contact, and there is a predetermined T-contact line segmentation order between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; a second determination module, used to determine the load rates corresponding to the multiple branch lines respectively based on the T-contact terminal currents corresponding to the multiple T-contacts respectively.

[0014] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executing any one of the line load rate determination methods.

[0015] According to another aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the line load rate determination methods described.

[0016] In the embodiment of the present application, by determining the T-contacts existing in the power grid, wherein the T-contacts are the contacts for drawing branch lines from the main line in the power grid; in the case of multiple T-contacts, a predetermined processing method is adopted to obtain the T-contact terminal currents corresponding to the multiple T-contacts respectively, wherein the predetermined processing method is a method for determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; based on the T-contact terminal currents corresponding to the multiple T-contacts respectively, the load rates corresponding to the multiple branch lines are determined. The purpose of using the automatic calculation method to reduce the configuration requirements for the line detection equipment is achieved, and the technical effect of improving the flexibility of obtaining the line load rate is achieved, thereby solving the technical problem of the large limitations of the line load rate acquisition method in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1is a flow chart of an optional line load rate determination method provided according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of an optional method for determining a line load rate provided according to an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of an optional line load rate determination device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0024] In high-voltage power supply, a T-connection refers to a line that is connected from the line that supplies power to Party B to supply power to a third party, Party C. This wiring method forms a shape similar to the letter "T", so it is called a T-connected line. It is the key point for distributing power from the main line to the branch line, and determines which users or systems can obtain power.

[0025] The widespread application of interactive energy-consuming equipment such as electric vehicles, distributed energy, and energy storage has put forward extremely high requirements for the online safety analysis of distribution networks of 35kV and above. There is an urgent need for a set of online safety analysis calculation methods for 35kV and above power grids and real-time monitoring technical solutions for heavy overload equipment, so that power grid operators can always grasp the load of the lines, and provide reference and support for load transfer decisions when the power grid is under high load.

[0026] In response to the above problems, an embodiment of the present application provides an optional method embodiment for determining a line load rate. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] Figure 1 is a flow chart of an optional method for determining a line load rate according to an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0028] Step S102, determining a T-junction existing in the power grid, wherein the T-junction is a junction where a branch line is derived from a main line in the power grid;

[0029] It can be understood that through the topological structure analysis of the power grid, the junction where the branch line is drawn from the main line, that is, the T junction, is identified. The T junction is a key node for current distribution in the power grid, which determines how the main line current is diverted to each branch line. By accurately identifying the T junction, support is provided for the subsequent calculation of the load rate of each branch line. By automatically identifying the T junction, manual intervention is reduced, and efficiency and accuracy are improved.

[0030] Optionally, the execution entity may be a power grid cloud control system.

[0031] Optionally, the calculation is performed according to the flow direction maintained in the AC line segment table and the sequence of T-connected line segments, and the current value of the direct-collected line segment equipped with a current transformer is used to infer the current value of the segmented branch line that cannot be directly collected.

[0032] Step S104, when there are multiple T-contacts, a predetermined processing method is used to obtain T-contact terminal currents corresponding to the multiple T-contacts, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines;

[0033] It can be understood that when there are multiple T-junctions in the power grid, according to the predetermined T-junction line segmentation sequence (such as from the source to the end of the main line), based on the T-junction end current of the previous T-junction, through the current distribution principle (such as Kirchhoff's current law) or the preset algorithm model, the T-junction end current of the next T-junction is gradually calculated. This method of calculating the current of the next T-junction based on the current of the previous T-junction avoids the need to install current detection equipment at each T-junction, reducing equipment costs and maintenance difficulties. At the same time, through automated calculations, the efficiency and accuracy of data processing are improved, providing a guarantee for the accurate calculation of the load rate.

[0034] In an optional embodiment, a predetermined processing method is adopted to obtain T-contact terminal currents corresponding to multiple T-contacts respectively, including: determining a starting point among multiple T-contacts as the previous T-contact; based on the segmentation order of the T-contact line, determining the next T-contact after the starting point as the next T-contact; based on the T-contact terminal current corresponding to the starting point and the power data of the next plant station connected to the next T-contact, determining the T-contact terminal current corresponding to the next T-contact; adopting the method of determining the T-contact terminal current corresponding to the next T-contact, the T-contact terminal currents corresponding to multiple T-contacts are obtained.

[0035] It can be understood that through the topological structure analysis of the power grid, all the junctions of the branch lines drawn from the main line, that is, the T junctions, are identified. These T junctions are the key nodes for current distribution in the power grid. Among the multiple T junctions, one is selected as the starting point, and the starting point will be used as the "previous T junction" in the subsequent calculation. According to the predetermined segmentation order of the T-connected line in the power grid, the next T junction after the starting point, that is, the "next T junction", is determined. This order reflects the flow path of the current in the power grid. Based on the T junction terminal current corresponding to the starting point, and the power data (such as voltage, power, etc.) of the next plant station connected to the next T junction, the T junction terminal current corresponding to the next T junction is obtained. Here, the power data may include the current value directly collected from the plant station, or the current value indirectly obtained by other means (such as based on power and voltage calculation). The T junction terminal current of each subsequent T junction is calculated in sequence by using the above method of determining the T junction terminal current corresponding to the next T junction until all T junctions are processed. After obtaining the T-contact end current of each T-contact, the load rate of each branch line is calculated according to the current distribution of the branch line (that is, the current size drawn from the T-contact of each branch line) and the rated capacity or design parameters of the branch line.

[0036] By automatically calculating the T-junction current and branch line load rate, the need for manual intervention and on-site measurement is reduced, and the efficiency of data acquisition is improved. The need to install current detection equipment at each T-junction is avoided, reducing equipment costs and maintenance difficulties.

[0037] Optionally, the above power data can be of multiple types, for example, active power, current value, voltage value, etc.

[0038] In an optional embodiment, the power data includes active power and current value. Based on the T-contact terminal current corresponding to the starting point and the power data of the next plant connected to the next T-contact, the T-contact terminal current corresponding to the next T-contact is determined, including: based on the positive and negative conditions of the active power of the next plant, the current value is adjusted to obtain the adjusted current value; based on the T-contact terminal current corresponding to the starting point and the adjusted current value, the T-contact terminal current corresponding to the next T-contact is determined.

[0039] It can be understood that through the topological structure analysis of the power grid, all the junctions of the branch lines drawn from the main line, that is, the T junctions, are identified. Based on the positive and negative conditions of the active power of the next plant station, the collected current value is adjusted positively and negatively. If the active power is positive, it means that the plant station is injecting power into the power grid, and the current direction may be consistent with the original measurement direction. If the active power is negative, it means that the plant station is absorbing power from the power grid, and the current direction may be opposite to the original measurement direction. Therefore, it is necessary to make corresponding positive and negative adjustments to the current value according to the positive and negative active power to obtain the adjusted current value. Based on the T-junction terminal current corresponding to the starting point and the current value after positive and negative adjustments, the T-junction terminal current corresponding to the next T-junction is calculated. The above calculation process can also take into account other parameters such as the impedance and voltage of the power grid. Using the above method, the T-junction terminal current of each subsequent T-junction is calculated in turn until all T-junctions are processed. After obtaining the T-contact end current of each T-contact, the load rate of each branch line is calculated according to the current distribution of the branch line (that is, the current size drawn from the T-contact of each branch line) and the rated capacity or design parameters of the branch line.

[0040] Optionally, find the active power and current values ​​corresponding to the endpoints of the line. Determine the positive and negative of the current value based on the positive and negative active power value. If both the active power and current data do not exist, stop the calculation. Filter the plant stations (A, B) connected to the starting point T1, and find out the active power and current values ​​corresponding to the endpoints of the line. If the active power ≥ 0, the current is positive; if the active power < 0, the current is negative; if both the active power and the current do not exist, stop the calculation. Calculate the current of the line between the T contacts. Assuming that there is a T contact T2 connected to T1, the current at the T1 end of the T1 to T2 line = the line current value of station A + the line current value of station B, and so on, calculate the current values ​​of the subsequent lines between the T contacts.

[0041] In an optional embodiment, the method further includes: when the power data of the next plant station is missing, terminating the calculation processing of the T-contact terminal current corresponding to the next T-contact.

[0042] It is understandable that if the power data of the next plant is found to be missing (such as data not collected, data loss caused by equipment failure, etc.), the calculation and processing of the T-contact terminal current corresponding to the next T-contact will be terminated. In the case of incomplete data, no inaccurate calculation will be attempted, thereby avoiding potential errors and misleading.

[0043] Optionally, there can be multiple starting points. After the calculation process for one starting point is terminated, calculation can be performed from another starting point. In the new calculation process, there is no need to repeat the calculation of the calculated branch. By integrating the calculation processes of multiple starting points, the calculation results of the branches in the entire power grid can be obtained.

[0044] In an optional embodiment, determining a starting point among multiple T-junctions includes: determining the plant station connection status corresponding to the multiple T-junctions respectively; and among the multiple T-junctions, determining the plant station connection status indicating that two plant stations are connected as the starting point.

[0045] It can be understood that according to the topological structure of the power grid, all T-junctions in the power grid are identified and determined to form a T-junction set. For each T-junction in the set, the plant station information connected to it is collected, including the number of plant stations and which specific plant stations they are. Based on the collected plant station connection information, the plant station connection status of each T-junction is analyzed. Those T-junctions that are connected to two plant stations are found as the starting point. It can be understood that a T-junction can have three connection ends, generally only one end is connected to a plant station, and the other two ends are connected to other T-junctions, thus forming a connection sequence connected end to end, and the T-junction that is the starting point, the previous one connected is not a T-junction, but another plant station, that is, the starting point needs to have two connection ends connected to the plant station, and the remaining connection end is connected to the next T-junction.

[0046] Step S106, based on the T-contact terminal currents corresponding to the multiple T-contacts, respectively, the load rates corresponding to the multiple branch lines are determined.

[0047] It can be understood that after obtaining the T-contact end current of each T-contact, the load rate of each branch line is calculated according to the current distribution of the branch line (that is, the current size drawn from the T-contact of each branch line) and the rated capacity or design parameters of the branch line. By automatically calculating the load rate of each branch line, the load conditions of each part of the power grid can be grasped in real time and accurately, providing an important basis for the dispatching, operation and planning of the power grid. At the same time, this method of calculating the load rate based on the T-contact current reduces the dependence on line detection equipment, reduces costs, and improves the level of intelligence in power grid management.

[0048] In an optional embodiment, based on the T-contact end currents corresponding to the multiple T-contacts, the load rates corresponding to the multiple branch lines are determined, including: determining the maximum current-carrying values ​​corresponding to the multiple branch lines; based on the maximum current-carrying values ​​corresponding to the multiple branch lines, and the T-contact end currents corresponding to the multiple T-contacts, the load rates corresponding to the multiple branch lines are determined.

[0049] It is understandable that it is necessary to obtain the technical parameters of each branch line, such as the maximum allowable current value, that is, the maximum current carrying value. The above maximum current carrying value is determined based on factors such as the wire specifications, insulation materials, ambient temperature and safety margin of the branch line. After obtaining the maximum current carrying value of each branch line and the current at the T-contact end connected to it, the load rate of each branch line can be obtained by calculation. By utilizing the existing measurement data and power grid topology information, the load conditions of each section of the T-connected line are calculated through a mathematical model, avoiding the problem of being unable to detect the line load rate in real time due to insufficient configuration of the measuring device, and providing data support for issues such as power grid dispatching decisions.

[0050] It can be understood that the T-contact terminal current corresponding to each T-contact is calculated based on the topological structure and power data of the power grid, reflecting the situation where the current is diverted from the main line to each branch line at the T-contact. For each branch line, the maximum current value that the branch line can safely carry, that is, the maximum current carrying value, is determined based on its design parameters, rated capacity or historical operation data. This value represents the maximum current that the branch line can continuously transmit without overheating, damage or other safety problems. Based on the maximum current carrying value corresponding to each branch line and the T-contact terminal current diverted to the branch line through the T-contact, the load rate of the branch line is calculated. The load rate is usually obtained by dividing the actual current value by the maximum current carrying value, which reflects the degree to which the current operating state of the branch line is close to full load.

[0051] In an optional embodiment, the method further includes: determining a maximum load rate among the load rates corresponding to the plurality of branch lines; and using the maximum load rate as the load rate of the main line.

[0052] It can be understood that according to the real-time operation data of the power grid, the T-contact terminal current corresponding to each T-contact is obtained. Based on the T-contact terminal current and the maximum current-carrying value of each branch line, the load rate of each branch line is calculated. Compare these load rate values ​​and find the maximum value, that is, the maximum load rate. By using the maximum branch line load rate as the load rate of the main line, the evaluation process of the main line load condition can be simplified. Using the maximum branch line load rate as the load rate of the main line actually provides an estimation method for the operating status of the main line, which helps to ensure that during the grid dispatching and operation and maintenance process, sufficient vigilance is maintained on the performance and capacity of the main line, thereby avoiding potential heavy overload risks.

[0053] Optionally, when determining the load rate of the main line, in addition to directly using the maximum load rate of multiple branch lines as the load rate of the main line, a variety of other methods can be used to more comprehensively reflect the load situation of the main line. These methods include but are not limited to weighted average method, capacity ratio method, and statistical methods based on actual operation data.

[0054] The weighted average method is a method that takes into account the different degrees of influence of the load rate of each branch line on the main line. Each branch line load rate is assigned a weight, which can be determined based on factors such as the capacity, importance, and historical load conditions of the branch line. Then, these weighted load rates are added together and divided by the sum of the weights to obtain the weighted average load rate of the main line.

[0055] The capacity ratio method is a method for determining the load rate based on the ratio of the capacity of each branch line to the total capacity of the main line. First, the ratio of the capacity of each branch line to the total capacity of the main line is calculated, and then the weighted sum of the load rates of each branch line is calculated according to these ratios to obtain the load rate of the main line. This method can more directly reflect the contribution of each branch line to the load of the main line.

[0056] If there is enough historical operation data in the system, statistical methods can be used to determine the load rate of the main line. For example, the load of the main line in different time periods (such as day, week, month, etc.) can be analyzed, and its average, maximum, minimum and other statistics can be calculated, and then the load rate of the main line can be evaluated based on these statistics. In addition, time series analysis, machine learning and other methods can be used to predict the load of the main line in the future.

[0057] In some cases, only considering the current load rate may not be enough to fully reflect the load status of the main line. In this case, the change rate of the load rate can be considered as an evaluation factor. For example, the change rate of the load rate of each branch line can be calculated, and their weight or influence in determining the load rate of the main line can be adjusted accordingly, which can better reflect the dynamic change characteristics of the load.

[0058] Optionally, the load rate is calculated based on the maximum current carrying value of each branch line, the load rates of members of the same line set are compared, and the maximum value is taken and assigned to the load rate of the main line.

[0059] Optionally, a line load rate screen is designed in terms of human-machine display, and an identification item of "whether it is T-connected" is added. The user only needs to perform simple operations (such as right-clicking) to quickly query relevant load rate information according to the T-connection status of the line. If the line is a T-connected line, the system will display the detailed details of the load rate of each member; if it is not a T-connected line, a clear prompt will be given to ensure the convenience of user operation and the intuitiveness of information acquisition. Through the methods provided in the above embodiments, online analysis, calculation and modeling methods for large-scale multi-level nested T-connected networks can be provided, which not only improves the intelligent level of power grid dispatching, but also provides strong technical support for the safe and efficient operation of the power grid through its universality, automated statistics, intelligent calculation and optimized human-computer interaction design.

[0060] Through the above step S102, the T-contacts existing in the power grid are determined, wherein the T-contacts are the contacts that lead out the branch lines from the main line in the power grid; in step S104, in the case of multiple T-contacts, a predetermined processing method is adopted to obtain the T-contact terminal currents corresponding to the multiple T-contacts respectively, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; in step S106, based on the T-contact terminal currents corresponding to the multiple T-contacts respectively, the load rates corresponding to the multiple branch lines are determined. The purpose of using the automatic calculation method to reduce the configuration requirements for the line detection equipment is achieved, thereby solving the technical problem of the large limitations of the line load rate acquisition method in the related art.

[0061] Based on the above embodiments and optional embodiments, the present application proposes an optional implementation method, providing a method for calculating the load rate of a T-connected line in a 35kV and above distribution network, so as to accurately and timely grasp the load rate of the line branch. According to the flow direction maintained in the AC line segment table and the T-connected line segment sequence, the calculation is performed, and the current value of the direct-collected line segment equipped with a current transformer is used to infer the current value of the segmented branch line that cannot be directly collected.

[0062] Establish a line segmentation model, determine the subordinate relationship between the main line and branch lines and the priority between the branch lines, find all T-junctions in the line set, and if a T-junction connects two plants, it will be used as the starting point of the flow direction.

[0063] Filter non-T-connected plant stations and obtain data, filter non-T-connected plant stations connected by T contacts (such as A, B), if T1 is not connected to any T contact, stop calculating.

[0064] Find the active value and current value corresponding to the line endpoints. Determine the positive and negative current value based on the active value. If both the active value and the current data do not exist, stop the calculation. Filter the plant stations (A, B) connected to the starting point T1, and find the active value and current value corresponding to the line endpoints. If the active value ≥ 0, the current is positive; if the active value < 0, the current is negative; if both the active value and the current do not exist, stop the calculation.

[0065] Calculate the current of the line between T contacts. Assuming that there is a T contact T2 connected to T1, the current at the T1 end of the T1 to T2 line = the line current value of station A + the line current value of station B, and so on. Calculate the current value of the subsequent lines between T contacts.

[0066] Select the next T junction T2 connected to point T1, and search for all sites (T1, C, T3) connected to point T2. If T2 has no new T junctions connected except T1, stop the calculation.

[0067] Query the active power and current value of the above station C. If the active power ≥ 0, the current is positive; if the active power < 0, the current is negative; if the active power and current do not exist, stop the calculation.

[0068] Assuming that there is a T-junction T3 connected to T2, the current at the T2 end of the T2 to T3 line = the line current value at the T1 end + the line current value at the C station.

[0069] The above process is executed in a loop until there is no new T-connection connected to the Tn connection, and the calculation stops.

[0070] If there are multiple T-junctions in the line set that meet the starting point requirements, any one of the multiple T-junctions that meet the starting point requirements can be selected and the above steps are performed sequentially until all starting points are calculated.

[0071] The load rate is calculated based on the maximum current carrying value of each branch line, the load rates of each member of the same line set are compared, and the maximum value is assigned to the main line load rate.

[0072] Figure 2 is a schematic diagram of an optional line load rate determination method provided according to an embodiment of the present application, such as Figure 2 As shown, taking an example including three T-junctions, the network topology of the power grid is as follows: 220kV Station A and Station E are two power stations, 110kV Station B, Station C, and Station D are three pure load stations, and Stations B, C, and D are connected to the line from Station A to Station E through T-junctions T1, T2, and T3.

[0073] Step S1, sort out the T-connected line set of the main line in the power grid, which includes lines 1 to 7. Mark the flow direction, and mark the segmentation order of the T-connected line according to the flow direction. Establish a line segmentation model based on the plant-station topology relationship, determine that the line composed of lines 1, 3, 5, and 7 is the main line, and the line connected from point T1 to point B, from point T2 to point C, and from point T3 to point D is the branch line.

[0074] In step S2, it is found that T1 is connected to two power plants at points A and B, and T3 is connected to two power plants at points D and E. Both T points are connected to two power plants, so both can be used as starting points. Any point can be selected as the starting point, for example, T1 is selected as the starting point of the flow direction of the tidal current, and the calculation is performed from left to right.

[0075] Step S3, searching for all sites (A, B, T2) connected to T junction T1.

[0076] Step S4, screen the power plants (A, B) and find out the active value and current value corresponding to their line endpoints. If the active value is ≥ 0, the current is positive; if the active value is < 0, the current is negative and set as Ia and Ib respectively.

[0077] Step S5, the electrical contact current at the T1 end of the T1 to T2 line = the line current value of station A + the line current value of station B, that is, I1 = Ia + Ib.

[0078] Step S6, select the next T junction T2 connected to point T1, search all sites (T1, C, T3) connected to point T2, find a new T junction T3 that T2 is connected to in addition to T1, and continue calculation.

[0079] Step S7, query the active power value and current value of the above-mentioned station C. If the active power ≥ 0, the current is positive; if the active power < 0, the current is negative; if the active power and current do not exist, stop the calculation.

[0080] Step S8, the current at the T2 end of the T2 to T3 line = the current at the T1 end of the T1 to T2 line + the current value of the C station line, that is, I2 = I1 + Ic.

[0081] Step S9, loop through steps S6-S8, and if it is found that T3 has no new T-connection connected except T2, stop the calculation.

[0082] Step S10, in the line set, there are 2 T-junctions that meet the starting point requirements, namely T1 and T3, and steps S2 to S9 are executed in sequence, but it is found that lines 1, 2, 3, 4, and 5 have been calculated, so the calculation stops.

[0083] Step S11, calculating the load rate according to the maximum current carrying capacity of each branch line, and obtaining the load rate of each member of the line set accordingly.

[0084] In addition, this method also has certain usage conditions. When the same T-connected lines are concentrated, and there is a line end at the physical plant station such as A, B, C, D, and E where the current value is not collected, the current of the physical station can be calculated by adjusting the T-connected line segmentation sequence to a later time.

[0085] The above optional implementation method achieves at least the following effects: a complete set of online analysis, calculation and modeling methods for large-scale multi-level nested T-connection networks is proposed, which is not only applicable to power grid lines of 35kV and above voltage levels, but also can effectively realize real-time detection of load rate, and provide solid data support for auxiliary decision-making under heavy overload conditions. It shows a high degree of universality and can be flexibly applied to similar networks of different voltage levels, especially those institutions facing the challenges of large-scale multi-level nested T-connection networks, providing a reference solution for reference and promoting the improvement of the intelligent level of power grid dispatching. Through this method, the load rate of all segmented lines under a single-loop T-connection line set can be automatically counted according to the line ID, which greatly improves the efficiency and accuracy of data processing. This function enables power grid dispatchers to quickly grasp the load conditions of each section of the line, providing a strong guarantee for the safe and stable operation of the power grid. For lines that are not equipped with current transformers and other collection and metering facilities, the system can automatically calculate its current load rate through arithmetic addition and subtraction algorithms according to the flow direction, thereby avoiding the need for hardware investment on each line. This innovation not only simplifies the power grid construction process, but also significantly reduces the future planning and construction costs.

[0086] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0087] In this embodiment, a line load rate determination device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the terms "module" and "device" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0088] According to an embodiment of the present application, there is also provided an embodiment of a device for implementing a method for determining a line load rate. Figure 3 is a schematic diagram of a line load rate determination device according to an embodiment of the present application, such as Figure 3 As shown, the above-mentioned line load rate determination device includes: a first determination module 302, a calculation processing module 304, and a second determination module 306. The device is described below.

[0089] A first determination module 302 is used to determine a T-junction existing in the power grid, wherein the T-junction is a junction where a branch line is drawn from a main line in the power grid;

[0090] The calculation processing module 304 is connected to the first determination module 302 and is used to obtain the T-contact terminal currents corresponding to the multiple T-contacts respectively by using a predetermined processing method when there are multiple T-contacts, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines;

[0091] The second determination module 306 is connected to the calculation processing module 304 and is used to determine the load rates corresponding to the plurality of branch lines respectively based on the T-contact terminal currents corresponding to the plurality of T-contacts respectively.

[0092] In a line load rate determination device provided by an embodiment of the present application, a first determination module 302 is set to determine the T-contacts existing in the power grid, wherein the T-contacts are the contacts of the branch lines drawn from the main line in the power grid; a calculation processing module 304 is connected to the first determination module 302, and is used to adopt a predetermined processing method to obtain the T-contact terminal currents corresponding to the multiple T-contacts respectively when there are multiple T-contacts, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; a second determination module 306 is connected to the calculation processing module 304, and is used to determine the load rates corresponding to the multiple branch lines respectively based on the T-contact terminal currents corresponding to the multiple T-contacts. The purpose of using the automatic calculation method to reduce the configuration requirements for the line detection equipment is achieved, and the technical effect of improving the flexibility of line load rate acquisition is achieved, thereby solving the technical problem of the large limitations of the line load rate acquisition method in the related art.

[0093] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0094] It should be noted that the first determination module 302, the calculation processing module 304, and the second determination module 306 correspond to steps S102 to S168 in the embodiment, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the modules as part of the device can be run in a computer terminal.

[0095] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0096] The above-mentioned line load rate determination device may also include a processor and a memory. The first determination module 302, the calculation processing module 304, the second determination module 306, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.

[0097] The processor includes a kernel, which retrieves the corresponding program unit from the memory. There can be one or more kernels. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one storage chip.

[0098] An embodiment of the present application provides a non-volatile storage medium on which a program is stored. When the program is executed by a processor, a method for determining a line load rate is implemented.

[0099] The embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program stored in the memory and can be run on the processor. When the processor executes the program, the following steps are implemented: determining the T-contacts existing in the power grid, wherein the T-contacts are the contacts that lead out the branch lines from the main line in the power grid; in the case of multiple T-contacts, a predetermined processing method is adopted to obtain the T-contact terminal currents corresponding to the multiple T-contacts respectively, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation order between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; based on the T-contact terminal currents corresponding to the multiple T-contacts respectively, the load rates corresponding to the multiple branch lines are determined. The device in this article can be a server, a PC, etc.

[0100] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with the following method steps: determining a T-contact existing in a power grid, wherein the T-contact is a contact for leading a branch line from a main line in the power grid; in the case of multiple T-contacts, adopting a predetermined processing method to obtain T-contact terminal currents corresponding to multiple T-contacts respectively, wherein the predetermined processing method is a method of determining the T-contact terminal current of a subsequent T-contact based on the T-contact terminal current of a previous T-contact, there is a predetermined T-contact line segmentation order between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; based on the T-contact terminal currents corresponding to the multiple T-contacts respectively, determining the load rates corresponding to the multiple branch lines respectively.

[0101] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0102] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0103] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0105] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0106] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0107] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0108] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0109] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0110] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining a line load rate, characterized in that: include: Determine a T-junction existing in the power grid, wherein the T-junction is a junction where a branch line is drawn from a main line in the power grid; In the case where there are multiple T-contacts, a predetermined processing method is used to obtain T-contact terminal currents corresponding to the multiple T-contacts, wherein the predetermined processing method is a method of determining the T-contact terminal current of the next T-contact based on the T-contact terminal current of the previous T-contact, and there is a predetermined T-contact line segmentation sequence between the multiple T-contacts, and the multiple T-contacts divide the main line into multiple branch lines; Based on the T-contact terminal currents respectively corresponding to the multiple T-contacts, the load rates respectively corresponding to the multiple branch lines are determined.

2. The method according to claim 1, characterized in that: The method adopts a predetermined processing method to obtain the T-contact terminal currents corresponding to the plurality of T-contacts, including: Determine a starting point among a plurality of T junctions as the previous T junction; Based on the segmentation sequence of the T-junction line, determining the next T-junction after the starting point as the next T-junction; Determine the T-point terminal current corresponding to the next T-point based on the T-point terminal current corresponding to the starting point and the power data of the next plant connected to the next T-point; The T-contact terminal currents corresponding to the multiple T-contacts are obtained by determining the T-contact terminal current corresponding to the next T-contact.

3. The method according to claim 2, characterized in that The power data includes active power and current value, and the determining of the T-point terminal current corresponding to the next T-point based on the T-point terminal current corresponding to the starting point and the power data of the next plant connected to the next T-point includes: Based on the positive or negative condition of the active power of the next plant station, the current value is adjusted to obtain an adjusted current value; Based on the T-junction terminal current corresponding to the starting point and the adjusted current value, the T-junction terminal current corresponding to the next T-junction is determined.

4. The method according to claim 2, characterized in that: The method further comprises: In the case that the power data of the next plant station is missing, the calculation process of the T-contact terminal current corresponding to the next T-contact is terminated.

5. The method according to claim 2, characterized in that: The step of determining a starting point among a plurality of T-junctions comprises: Determine the plant-station connection status corresponding to each of the plurality of T-junctions; Among the multiple T-junctions, the one whose plant station connection status indicates that two plants are connected is determined as the starting point.

6. The method according to any one of claims 1 to 5, characterized in that: The determining the load rates corresponding to the plurality of branch lines respectively based on the T-contact terminal currents corresponding to the plurality of T-contacts respectively includes: Determine the maximum current carrying values ​​corresponding to the plurality of branch lines respectively; Based on the maximum current carrying values ​​respectively corresponding to the plurality of branch lines and the T-contact terminal currents respectively corresponding to the plurality of T-contacts, the load rates respectively corresponding to the plurality of branch lines are determined.

7. The method according to claim 6, characterized in that The method further comprises: Determine a maximum load rate among the load rates corresponding to the plurality of branch lines; The maximum load rate is used as the load rate of the main line.

8. A line load factor determination device, characterized in that: include: A first determination module is used to determine a T-junction existing in a power grid, wherein the T-junction is a junction where a branch line is drawn from a main line in the power grid; a calculation processing module, configured to obtain T-contact terminal currents corresponding to the plurality of T-contacts respectively by adopting a predetermined processing method when there are a plurality of T-contacts, wherein the predetermined processing method is a method of determining the T-contact terminal current of a subsequent T-contact based on the T-contact terminal current of a previous T-contact, and a predetermined T-contact line segmentation sequence exists between the plurality of T-contacts, and the plurality of T-contacts divide the main line into a plurality of branch lines; The second determination module is used to determine the load rates corresponding to the multiple branch lines respectively based on the T-contact terminal currents corresponding to the multiple T-contacts respectively.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the line load rate determination method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: One or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the line load rate determination method described in any one of claims 1 to 7.

Images