AVC locking method and device based on bus loop closing scene, terminal equipment and storage medium

Abstract

The invention discloses an AVC locking method and device based on a bus loop closing scene, terminal equipment and a storage medium, and belongs to the field of electric power systems.The method comprises the steps that when a user triggers loop closing operation of two target buses, a power grid topological graph is obtained; determining a power supply of the target bus; if the power supplies of the target bus are not the same power supply, determining that the target bus is a heterogenous bus, otherwise, acquiring a voltage phasor and a frequency time sequence of the target bus, and calculating a phase angle difference and a Pearson correlation coefficient of the target bus; according to the phase angle difference and the Pearson's correlation coefficient, determining whether the target bus is a heterogenous bus or a homologous bus; and if the target bus is a heterogenous bus, locking AVC of reactive equipment in a transformer substation where the target bus is located. The technical blank of bus loop closing scene recognition in the prior art is filled, and the problem that the prior art depends on manual recognition can be solved through implementation of the bus loop closing scene recognition method and device.

Description

Technical Field

[0001] This invention relates to the field of power systems, and in particular to an AVC blocking method, apparatus, terminal equipment, and storage medium based on a bus loop scenario. Background Technology

[0002] In today's society, users have increasingly higher requirements for power supply quality. Voltage is a crucial indicator of power quality, and ensuring that the voltage operates close to its rated value is one of the fundamental tasks of power system dispatching and operation. The task of reactive power and voltage optimization in the power grid is to regulate voltage, ensure that the voltage is within the allowable range, adjust reactive power flow to a reasonable level, and reduce grid losses. Voltage regulation generally follows the principle of local regulation. In power systems, several capacitors, reactors, and on-load tap changers on the low-voltage side of substations are often used as reactive power compensation devices to regulate bus voltage and power factor.

[0003] Currently, low-voltage side voltage control in substations mainly relies on AVC, or Automatic Voltage and Reactive Power Control. AVC systems are commonly used voltage regulation systems in power grids, playing a crucial role in ensuring voltage stability by maintaining low-voltage side voltage at normal levels and achieving comprehensive control of voltage and reactive power. However, AVC suffers from several drawbacks, including a lack of bus loop control scenarios and incomplete control strategies. This problem primarily manifests in the reliance on manual judgment of whether the buses to be closed are powered by the same or different sources; it also stems from the need for manual triggering of AVC blocking and voltage regulation of the buses with different power sources when they are connected to different sources.

[0004] Because the AVC lacks the aforementioned bus loop control scenario and relies on manual operation, there is a risk of operational omissions. Therefore, there is an urgent need for a method for automatic identification and voltage regulation of the control scenarios missing from the AVC. Summary of the Invention

[0005] This invention provides an AVC interlocking method, device, terminal equipment, and storage medium based on a bus loop scenario, which can solve the problem of relying on manual control of AVC interlocking in the prior art.

[0006] One embodiment of the present invention provides an AVC blocking method based on a bus loop closing scenario, comprising: When a user triggers a loop-closing operation on two target buses, a power grid topology map is obtained; wherein, the power grid topology map is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches; For each target bus, a bidirectional breadth-first search is performed on the power grid topology map, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply source for the target bus. If the power supplies for the two target buses are not from the same source, then the two target buses are determined to be heterogeneous buses. Otherwise, the voltage phasors and frequency time series of the two target buses are obtained; the phase angle difference between the two target buses is calculated based on the voltage phasors; the Pearson correlation coefficient between the two target buses is calculated based on the frequency time series; and the two target buses are determined to be heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient. If the two target buses are of different origins, then the AVC of the reactive power equipment in the substations where the two target buses are located will be blocked.

[0007] Further, determining whether the two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: If the phase angle difference is less than a preset phase angle difference threshold and the Pearson correlation coefficient is greater than a preset Pearson correlation coefficient threshold, then the two target buses are determined to be of the same origin; otherwise, the two target buses are determined to be of different origins.

[0008] Further, determining whether the two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: Using a fuzzy logic decision tree, the source confidence level is output based on the voltage phase angle difference and the Pearson correlation coefficient. If the confidence level of the two target buses exceeds the preset confidence level threshold, then the two target buses are determined to be the same source buses; otherwise, the two target buses are determined to be different source buses.

[0009] Furthermore, after blocking the AVC of reactive power equipment in the substations where the two target buses are located, it also includes: Obtain the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; Based on the historical loop-closed bus voltage difference and the corresponding historical loop-closed results, the voltage difference threshold is determined using the random forest algorithm; When the voltage difference between the two target buses exceeds the voltage difference threshold, the voltage of the two target buses is adjusted to reduce the voltage difference between the two target buses to the voltage difference threshold.

[0010] Further, the step of regulating the voltage of the two target buses to reduce the voltage difference between the two target buses to the voltage difference threshold includes: Using the switching status of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables, and taking minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of equipment actions, and minimizing the regulation cost as multiple objectives, and using voltage safety boundary, equipment capacity limit, and regulation compensation limit as constraints, a voltage regulation model is constructed. Solving the voltage regulation model yields the Pareto front that satisfies the multiple objectives; Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power equipment, the target tap position of the main transformer, and the target reactive power output of the reactive power equipment corresponding to each equilibrium point are taken as candidate schemes. For each of the candidate schemes, a preliminary simulation is performed to deduce the voltage change curve; Based on the voltage change curve, the candidate scheme with the lowest probability of exceeding the limit is selected as the final scheme; According to the final solution, the reactive power equipment is adjusted.

[0011] Furthermore, adjusting the reactive power equipment according to the final solution includes: Obtain the current switching status and current reactive power output of each of the aforementioned reactive power devices; For each of the aforementioned reactive power devices, compare the current switching state and the target switching state of the reactive power device, and compare the current reactive power output and the target reactive power output of the reactive power device; When the target switching state is inconsistent with the current switching state or the target reactive power output is inconsistent with the current reactive power output, unlock the AVC of the reactive power device; The reactive power equipment is adjusted according to the target switching state and target reactive power output of the reactive power equipment. After adjustment, the AVC of the reactive power equipment is locked.

[0012] Another embodiment of the present invention provides an AVC interlocking device based on a busbar loop-closing scenario, comprising: a data acquisition module, an anomaly detection module, and an interlocking control module; The data acquisition module is used to acquire a power grid topology map when the user triggers the loop-closing operation of two target buses; wherein, the power grid topology map is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches; The heterogeneous source determination module is used to perform a bidirectional breadth-first search on the power grid topology map for each target bus, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply of the target bus. If the power supplies of two target buses are not the same, the two target buses are determined to be heterogeneous buses; otherwise, the voltage phasors and frequency time series of the two target buses are obtained. Based on the voltage phasors of the two target buses, the phase angle difference between the two target buses is calculated. Based on the frequency time series of the two target buses, the Pearson correlation coefficient between the two target buses is calculated. Based on the phase angle difference and the Pearson correlation coefficient, the two target buses are determined to be heterogeneous buses or homogeneous buses. The interlocking control module is used to interlock the AVC of reactive power equipment in the substation where the two target buses are located when the two target buses are of different origins.

[0013] Furthermore, the AVC interlocking device based on the busbar loop-closing scenario also includes: an over-limit voltage regulation module; The data acquisition module is also used to acquire the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; The over-limit voltage regulation module is used to determine the voltage difference threshold based on the historical closed-loop bus voltage difference and the corresponding historical closed-loop results using a random forest algorithm. When the voltage difference between two target buses exceeds the voltage difference threshold, a voltage regulation model is constructed using the switching state of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables. The model has multiple objectives: minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of device actions, and minimizing regulation costs. Voltage safety boundaries, device capacity limits, and regulation compensation limits are used as constraints. The voltage regulation model is solved to obtain the Pareto front that satisfies the multiple objectives. Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power device, the target tap position of the main transformer, and the target reactive power output of the reactive power device corresponding to each equilibrium point are used as candidate schemes. Each candidate scheme is pre-simulated to deduce the voltage change curve. Based on the voltage change curve, the candidate scheme with the lowest over-limit probability is selected as the final scheme. The reactive power device is then regulated according to the final scheme.

[0014] Another embodiment of the present invention provides a terminal device, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the steps of the AVC blocking method based on the bus loop scenario of the present invention.

[0015] Another embodiment of the present invention provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of the AVC blocking method based on the bus loop scenario of the present invention.

[0016] The following benefits can be obtained by implementing the present invention: This invention acquires a power grid topology map when a user triggers a loop-closing operation on two target buses. For each target bus, a bidirectional breadth-first search is performed on the topology map, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply source of the target bus. If the power supplies of the two target buses are not the same, the two target buses are determined to be heterogeneous buses; otherwise, the voltage phasors and frequency time series of the two target buses are acquired. Based on the voltage phasors of the two target buses, the phase angle difference between the two target buses is calculated. Based on the frequency time series of the two target buses, the Pearson correlation coefficient between the two target buses is calculated. Based on the phase angle difference and the Pearson correlation coefficient, it is determined whether the two target buses are heterogeneous or homogeneous buses. If the two target buses are heterogeneous buses, the AVC of the reactive power equipment in the substation where the two target buses are located is blocked. This invention can automatically identify bus loop-closing scenarios and automatically block AVC, filling the technical gap in bus loop-closing scenario identification in the prior art. This method no longer relies on manual identification, overcoming some accuracy and efficiency defects of manual judgment. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating an AVC blocking method based on a bus loop scenario provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an AVC interlocking device based on a busbar loop scenario provided by an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] See Figure 1 To address the problem of existing technologies relying on manual control of AVC interlocking, an embodiment of the present invention provides an AVC interlocking method based on a bus loop closing scenario, comprising: S1. When the user triggers the loop-closing operation of two target buses, obtain the power grid topology diagram; wherein, the power grid topology diagram is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches.

[0023] It should be noted that the target busbar refers to the busbar to be closed in the loop, typically a 10kV busbar. User-triggered loop closure means the user opens the remote control interface of the intermediate switch on the 10kV line between the two target buses, changes the switch's status from open to closed, and passes the preset check. The system then recognizes that the two target buses will undergo a loop closure operation. At this point, the loop closure operation is not yet executed but is about to begin; the user needs to click the execute button for it to actually start.

[0024] In one embodiment, the remote control interface is equipped with a cancel button, which can be used to pause the loop closure operation when the dispatch urgently needs to be suspended.

[0025] In one embodiment, obtaining the power grid topology map includes: constructing a full-network topology model based on the CIM / 61850 standard, and establishing a hierarchical graph structure containing nodes, branches, and power sources. Nodes refer to the busbars of each voltage level in substations, including 500kV, 220kV, 110kV, and 10kV busbars; branches refer to transmission lines, transformer windings, and switching equipment, including circuit breakers and disconnectors; and power sources refer to the 500kV main grid power supply points.

[0026] S2. For each target bus, starting from the node corresponding to the target bus and ending at each power source, perform a bidirectional breadth-first search on the power grid topology to determine the power supply source for the target bus.

[0027] It should be noted that the bidirectional breadth-first search starts from the node corresponding to the target bus and backtracks to higher voltage levels. At the same time, it starts from the power source and expands the search downwards. If the bidirectional paths intersect, it proves that the power source is the power supply for the target bus. If they do not intersect, it proves that the power source is not the power supply for the target bus.

[0028] S3. If the power supply sources for the two target buses are not the same, then the two target buses are determined to be heterogeneous buses; otherwise, obtain the voltage phasors and frequency time series of the two target buses; calculate the phase angle difference between the two target buses based on the voltage phasors; calculate the Pearson correlation coefficient between the two target buses based on the frequency time series of the two target buses; S5. Determine whether the two target buses are heterogeneous buses or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient.

[0029] In step S3, if the power supply sources of the two target buses are determined to be different through the power grid topology diagram, the two target buses are directly identified as heterogeneous buses. Otherwise, the two target buses are considered to be possibly homogeneous buses, and further judgment is required. This necessitates obtaining the voltage phasors and frequency time series of the two target buses. Specifically, the frequency time series of the two target buses are synchronously acquired through the WAMS system.

[0030] It should be noted that voltage phasors include amplitude and phase angle, which are used to calculate the phase angle difference between the two target buses.

[0031] This invention provides two methods for determining whether two target buses are heterogeneous or homogeneous based on phase angle difference and Pearson coefficient. One method is a threshold judgment method based on phase angle difference and Pearson coefficient, and the other method is a threshold judgment method based on homogeneity confidence.

[0032] In a preferred embodiment, determining whether two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: If the phase angle difference is less than a preset phase angle difference threshold and the Pearson correlation coefficient is greater than a preset Pearson correlation coefficient threshold, then the two target buses are determined to be of the same origin; otherwise, the two target buses are determined to be of different origins. The Pearson correlation coefficient threshold is set to 0.9.

[0033] In this embodiment, a threshold judgment method based on phase angle difference and Pearson coefficient is provided. When the phase angle difference is less than the phase angle difference threshold and the Pearson correlation coefficient is greater than the Pearson correlation coefficient threshold, the two target buses are determined to be of the same origin; otherwise, the two buses are determined to be of different origins.

[0034] In a preferred embodiment, determining whether two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: Using a fuzzy logic decision tree, the source confidence level is output based on the voltage phase angle difference and the Pearson correlation coefficient. If the confidence level of the two target buses exceeds the preset confidence level threshold, then the two target buses are determined to be the same source buses; otherwise, the two target buses are determined to be different source buses.

[0035] In this embodiment, a threshold judgment method based on phase angle difference and Pearson coefficient is provided. Fuzzy logic decision tree is introduced to assign confidence values ​​to the two types of power sources and to determine whether they are the same power source based on the final confidence value.

[0036] S4. If the two target buses are of different origins, then block the AVC of the reactive power equipment in the substations where the two target buses are located.

[0037] It should be noted that if the two target buses are of different origins, in order to avoid excessive voltage difference between the target buses causing impact on the closing switch, leading to loop failure or even damage to the switch, it is necessary to lock the AVC of the reactive power equipment on the target bus for subsequent voltage regulation operations.

[0038] In a preferred embodiment, after blocking the AVC of the reactive power equipment in the substations where the two target buses are located, the method further includes: Obtain the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; Based on the historical loop-closed bus voltage difference and the corresponding historical loop-closed results, the voltage difference threshold is determined using the random forest algorithm; When the voltage difference between the two target buses exceeds the voltage difference threshold, the voltage of the two target buses is adjusted to reduce the voltage difference between the two target buses to the voltage difference threshold.

[0039] It should be noted that the goal of the random forest algorithm is to maximize the success rate of loop merging.

[0040] In a preferred embodiment, the step of regulating the voltage of the two target buses to reduce the voltage difference between the two target buses to the voltage difference threshold includes: Using the switching status of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables, and taking minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of equipment actions, and minimizing the regulation cost as multiple objectives, and using voltage safety boundary, equipment capacity limit, and regulation compensation limit as constraints, a voltage regulation model is constructed. Solving the voltage regulation model yields the Pareto front that satisfies the multiple objectives; Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power equipment, the target tap position of the main transformer, and the target reactive power output of the reactive power equipment corresponding to each equilibrium point are taken as candidate schemes. For each of the candidate schemes, a preliminary simulation is performed to deduce the voltage change curve; Based on the voltage change curve, the candidate scheme with the lowest probability of exceeding the limit is selected as the final scheme; According to the final solution, the reactive power equipment is adjusted.

[0041] In this embodiment, when the voltage difference between the two target buses exceeds the preset voltage difference threshold, a multi-objective optimization algorithm is applied to provide candidate voltage regulation schemes, and the results of the candidate schemes are simulated to select the final scheme.

[0042] It should be noted that in multi-objective optimization, the Pareto front describes the set of optimal solutions among multiple conflicting objectives, where it is impossible to further optimize a particular objective by sacrificing other objectives. The equilibrium point refers to a specific solution within the set of optimal solutions among multiple conflicting objectives, where it is impossible to further optimize a particular objective without harming other objectives.

[0043] Several equilibrium points can be selected from the Pareto front. These points can be selected based on the actual needs of the power grid or randomly.

[0044] In a preferred embodiment, adjusting the reactive power equipment according to the final solution includes: Obtain the current switching status and current reactive power output of each of the aforementioned reactive power devices; For each of the aforementioned reactive power devices, compare the current switching state and the target switching state of the reactive power device, and compare the current reactive power output and the target reactive power output of the reactive power device; When the target switching state is inconsistent with the current switching state or the target reactive power output is inconsistent with the current reactive power output, unlock the AVC of the reactive power device; The reactive power equipment is adjusted according to the target switching state and target reactive power output of the reactive power equipment. After adjustment, the AVC of the reactive power equipment is locked.

[0045] In this embodiment, after the system successfully executes the voltage regulation scheme, it will continue to execute the target bus loop-closing command and the loop-breaking command. After the loop is broken, the AVC of the corresponding reactive power compensation device is unlocked.

[0046] This invention provides an AVC blocking method based on bus loop closing scenarios. This method can automatically identify bus loop closing scenarios and automatically block AVC, filling the technical gap in bus loop closing scenario identification in the prior art. This method no longer relies on manual identification, overcoming some accuracy and efficiency deficiencies of manual judgment.

[0047] This invention also provides a method for regulating the voltage of a different bus after AVC blocking, which improves the AVC control strategy and makes the application scope and action strategy of AVC more extensive; it realizes intelligent automatic control of the entire process of substation bus voltage in the reverse supply scenario, ensures the voltage quality of users, and prevents dispatching omissions.

[0048] like Figure 2 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; One embodiment of the present invention provides an AVC interlocking device based on a bus loop scenario, comprising: a data acquisition module, an anomaly detection module, and an interlocking control module; The data acquisition module is used to acquire a power grid topology map when the user triggers the loop-closing operation of two target buses; wherein, the power grid topology map is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches; The heterogeneous source determination module is used to perform a bidirectional breadth-first search on the power grid topology map for each target bus, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply of the target bus. If the power supplies of two target buses are not the same, the two target buses are determined to be heterogeneous buses; otherwise, the voltage phasors and frequency time series of the two target buses are obtained. Based on the voltage phasors of the two target buses, the phase angle difference between the two target buses is calculated. Based on the frequency time series of the two target buses, the Pearson correlation coefficient between the two target buses is calculated. Based on the phase angle difference and the Pearson correlation coefficient, the two target buses are determined to be heterogeneous buses or homogeneous buses. The interlocking control module is used to interlock the AVC of reactive power equipment in the substation where the two target buses are located when the two target buses are of different origins.

[0049] In a preferred embodiment, the AVC interlocking device based on the busbar loop scenario further includes: an over-limit voltage regulation module; The data acquisition module is also used to acquire the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; The over-limit voltage regulation module is used to determine the voltage difference threshold based on the historical closed-loop bus voltage difference and the corresponding historical closed-loop results using a random forest algorithm. When the voltage difference between two target buses exceeds the voltage difference threshold, a voltage regulation model is constructed using the switching state of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables. The model has multiple objectives: minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of device actions, and minimizing regulation costs. Voltage safety boundaries, device capacity limits, and regulation compensation limits are used as constraints. The voltage regulation model is solved to obtain the Pareto front that satisfies the multiple objectives. Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power device, the target tap position of the main transformer, and the target reactive power output of the reactive power device corresponding to each equilibrium point are used as candidate schemes. Each candidate scheme is pre-simulated to deduce the voltage change curve. Based on the voltage change curve, the candidate scheme with the lowest over-limit probability is selected as the final scheme. The reactive power device is then regulated according to the final scheme.

[0050] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the AVC blocking method based on the bus loop scenario provided by any of the above-described method embodiments of the present invention.

[0051] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0052] Based on the above-described method embodiments, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the AVC blocking method based on the bus loop scenario of any embodiment of the present invention.

[0053] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0054] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0055] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0056] Based on the above-described method embodiments, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the AVC blocking method based on the bus loop scenario described in any of the above-described method embodiments of the present invention.

[0057] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0058] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An AVC blocking method based on a busbar loop-closing scenario, characterized in that, include: When a user triggers a loop-closing operation on two target buses, a power grid topology map is obtained; wherein, the power grid topology map is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches; For each target bus, a bidirectional breadth-first search is performed on the power grid topology map, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply source for the target bus. If the power supplies for the two target buses are not from the same source, then the two target buses are determined to be heterogeneous buses. Otherwise, the voltage phasors and frequency time series of the two target buses are obtained; the phase angle difference between the two target buses is calculated based on the voltage phasors; the Pearson correlation coefficient between the two target buses is calculated based on the frequency time series; and the two target buses are determined to be heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient. If the two target buses are of different origins, then the AVC of the reactive power equipment in the substations where the two target buses are located will be blocked.

2. The AVC blocking method based on the bus loop closing scenario as described in claim 1, characterized in that, The step of determining whether two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: If the phase angle difference is less than a preset phase angle difference threshold and the Pearson correlation coefficient is greater than a preset Pearson correlation coefficient threshold, then the two target buses are determined to be of the same origin; otherwise, the two target buses are determined to be of different origins.

3. The AVC blocking method based on the bus loop closing scenario as described in claim 1, characterized in that, The step of determining whether two target buses are heterogeneous or homogeneous buses based on the phase angle difference and the Pearson correlation coefficient includes: Using a fuzzy logic decision tree, the source confidence level is output based on the voltage phase angle difference and the Pearson correlation coefficient. If the confidence level of the two target buses exceeds the preset confidence level threshold, then the two target buses are determined to be the same source buses; otherwise, the two target buses are determined to be different source buses.

4. The AVC blocking method based on the bus loop closing scenario as described in claim 1, characterized in that, After blocking the AVC of reactive power equipment in the substations where the two target busbars are located, it also includes: Obtain the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; Based on the historical loop-closed bus voltage difference and the corresponding historical loop-closed results, the voltage difference threshold is determined using the random forest algorithm; When the voltage difference between the two target buses exceeds the voltage difference threshold, the voltage of the two target buses is adjusted to reduce the voltage difference between the two target buses to the voltage difference threshold.

5. The AVC blocking method based on the bus loop closing scenario as described in claim 4, characterized in that, The step of adjusting the voltage of the two target buses to reduce the voltage difference between the two target buses to the voltage difference threshold includes: A voltage regulation model is constructed with the switching status of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables. The model has multiple objectives, including minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of equipment actions, and minimizing the regulation cost. The model is constrained by voltage safety boundary, equipment capacity limit, and regulation compensation limit. Solving the voltage regulation model yields the Pareto front that satisfies the multiple objectives; Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power equipment, the target tap position of the main transformer, and the target reactive power output of the reactive power equipment corresponding to each equilibrium point are taken as candidate schemes. For each of the candidate schemes, a preliminary simulation is performed to deduce the voltage change curve; Based on the voltage change curve, the candidate scheme with the lowest probability of exceeding the limit is selected as the final scheme; According to the final solution, the reactive power equipment is adjusted.

6. The AVC blocking method based on the bus loop closing scenario as described in claim 5, characterized in that, The adjustment of reactive power equipment according to the final solution includes: Obtain the current switching status and current reactive power output of each of the aforementioned reactive power devices; For each of the aforementioned reactive power devices, compare the current switching state and the target switching state of the reactive power device, and compare the current reactive power output and the target reactive power output of the reactive power device; When the target switching state is inconsistent with the current switching state or the target reactive power output is inconsistent with the current reactive power output, unlock the AVC of the reactive power device; The reactive power equipment is adjusted according to the target switching state and target reactive power output of the reactive power equipment. After adjustment, the AVC of the reactive power equipment is locked.

7. An AVC interlocking device based on a busbar loop-closing scenario, characterized in that, include: Data acquisition module, anomaly detection module, and interlocking control module; The data acquisition module is used to acquire a power grid topology map when the user triggers the loop-closing operation of two target buses; wherein, the power grid topology map is a hierarchical topology structure of nodes-branch-power sources, with buses as nodes and transmission lines, transformer windings and switching equipment as branches; The heterogeneous source determination module is used to perform a bidirectional breadth-first search on the power grid topology map for each target bus, starting from the node corresponding to the target bus and ending at each power source, to determine the power supply of the target bus. If the power supplies of two target buses are not the same, the two target buses are determined to be heterogeneous buses; otherwise, the voltage phasors and frequency time series of the two target buses are obtained. Based on the voltage phasors of the two target buses, the phase angle difference between the two target buses is calculated. Based on the frequency time series of the two target buses, the Pearson correlation coefficient between the two target buses is calculated. Based on the phase angle difference and the Pearson correlation coefficient, the two target buses are determined to be heterogeneous buses or homogeneous buses. The interlocking control module is used to interlock the AVC of reactive power equipment in the substation where the two target buses are located when the two target buses are of different origins.

8. The AVC interlocking device based on the busbar loop-closing scenario as described in claim 7, characterized in that, Also includes: Over-limit voltage regulation module; The data acquisition module is also used to acquire the historical loop-closing bus voltage difference and historical loop-closing results during several historical loop-closing operations; wherein, the types of loop-closing results include: success and failure; The over-limit voltage regulation module is used to determine the voltage difference threshold based on the historical closed-loop bus voltage difference and the corresponding historical closed-loop results using a random forest algorithm. When the voltage difference between two target buses exceeds the voltage difference threshold, a voltage regulation model is constructed using the switching state of each reactive power device, the tap position of the main transformer, and the reactive power output of each reactive power device as decision variables. The model has multiple objectives: minimizing the deviation between the voltage difference and the voltage difference threshold, minimizing the number of device actions, and minimizing regulation costs. Voltage safety boundaries, device capacity limits, and regulation compensation limits are used as constraints. The voltage regulation model is solved to obtain the Pareto front that satisfies the multiple objectives. Several equilibrium points are selected from the Pareto front, and the target switching state of the reactive power device, the target tap position of the main transformer, and the target reactive power output of the reactive power device corresponding to each equilibrium point are used as candidate schemes. Each candidate scheme is pre-simulated to deduce the voltage change curve. Based on the voltage change curve, the candidate scheme with the lowest over-limit probability is selected as the final scheme. The reactive power device is then regulated according to the final scheme.

9. A terminal device, characterized in that, The system includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the AVC blocking method based on the bus loop scenario as described in any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, include: A stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the AVC blocking method based on the bus loop scenario as described in any one of claims 1-6.

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