Load transfer path regulation and control method and system based on maintenance topology rule base

Abstract

The invention discloses a load transfer path regulation and control method and system based on a maintenance topology rule base, and relates to the technical field, and the method comprises the following steps: constructing a graph model, obtaining a load node of a shutdown device in the graph model, and obtaining a load path switching node based on a connected component analysis method; correcting the graph model to obtain a power grid topological graph of load path switching nodes, and generating a load path switching scheme based on a shortest path algorithm; a pre-switching adjustment strategy is set, and a load transfer action instruction is generated and executed step by step based on a load path switching scheme; carrying out local control on load transfer path adjustment based on a load transfer action instruction and a distributed control technology; the optimal load switching path is identified through connected component analysis and the shortest path algorithm, and the load transfer path of the maintenance equipment is controlled and switched according to the load transfer action instruction in combination with the distributed control technology, so that the stability, the flexibility, the response speed and the regulation and control precision of load path regulation and control are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of load transfer path regulation, and more specifically, to a load transfer path regulation method and system based on a maintenance topology rule library. Background Art

[0002] During the operation of the power grid, in order to ensure the safety and stability of power equipment, it is necessary to regularly maintain the power transmission and transformation equipment. However, the outage of some equipment during maintenance will lead to a decrease in power supply capacity and may even cause power outages on the user side. In order to reduce the power outage scope caused by maintenance, it is usually necessary to formulate a load transfer strategy to switch the affected load to other lines or substations for power supply to ensure the continuity of power supply.

[0003] The load transfer path refers to the redistribution of power through standby lines or other substations in the power system when a power supply line or equipment fails, is maintained, or encounters other special situations, so as to ensure the reliability and stability of power supply.

[0004] For example, the control method of an intelligent agent, an intelligent device, and a storage medium disclosed in the invention patent announcement with the publication number of CN116909133A includes: according to the current state and target state of the intelligent agent, determining the first distance and state transition pair between the current state and the target state through a reinforcement learning model; constructing a directed weighted graph based on the state transition pair and the first distance; determining state transition nodes according to the directed weighted graph; determining target state transition nodes according to the shortest path algorithm; and controlling the intelligent agent to transition from the current state to the target state according to the target state transition nodes.

[0005] For example, a method for testing the control time of multi-point load shedding for rapid load shedding protection of a power grid system disclosed in the invention patent announcement with the publication number of CN107703926A. The present invention discloses a method for testing the control time of multi-point load shedding for rapid load shedding protection of a power grid system. When the load shedding condition is reached, the co-control center station issues a load shedding command, and the load shedding command is sequentially transmitted to the control center station, the control sub-station, and the network-load interaction terminal. The network-load interaction terminal cuts off the corresponding interruptible load user branch switch according to the load shedding command; during the load shedding process, the time when the co-control center station issues the load shedding command, the time when the control center station receives the load shedding command, the time when the control sub-station receives the load shedding command, the time when the network-load interaction terminal receives the load shedding command, the time when the interruptible load user branch switch trips, and the time when the load current on the user side drops to zero are recorded, and the difference between the corresponding event times is the control delay. The principle of the present invention is simple, only a small number of test instruments are required, and it can effectively verify the accuracy of the control strategy, channel information, and control function of the system protection for rapid load shedding, optimize the cooperation between subsystems, and improve the overall operation performance of the system.

[0006] In the above - disclosed technical solutions, there are at least the following technical problems: In the actual application of most current load transfer path regulation methods, first of all, the identification of load path switching nodes and path planning lack systematic analysis and often rely on experience and manual operation, resulting in low scheduling efficiency. Existing load transfer path switching usually executes based on a fixed order and fails to dynamically adjust in combination with the health status and real - time operation conditions of load equipment, resulting in overloading of some standby equipment loads while other equipment resources are not fully utilized. And traditional power grid load transfer usually relies on a centralized control method and lacks a regional - level distributed control mechanism, resulting in inflexible adjustment of load transfer paths in local areas, affecting the coordinated operation of the overall power grid and making it difficult to achieve refined load balancing scheduling.

[0007] In view of the above problems, the present invention proposes a solution. Summary of the Invention

[0008] In order to overcome the above - mentioned defects of the prior art, embodiments of the present invention provide a load transfer path regulation method and system based on an overhaul topology rule library. By using a connected - component analysis method and a shortest - path algorithm, the optimal load switching path is identified, and the load transfer path of the overhaul equipment is controlled and adjusted according to the load transfer action instruction in combination with distributed control technology, significantly improving the stability, flexibility, response speed, and regulation accuracy of load path regulation.

[0009] To achieve the above object, the present invention provides the following technical solutions: A load transfer path regulation method based on an overhaul topology rule library includes the following steps: constructing a graph model, obtaining the load nodes of the out - of - service equipment in the graph model, and based on the connected - component analysis method, obtaining the load path switching nodes; modifying the graph model to obtain the power grid topology graph of the load path switching nodes, and generating a load path switching scheme based on the shortest - path algorithm; setting a pre - switching adjustment strategy, and based on the load path switching scheme, generating a load transfer action instruction to be executed step by step; and locally controlling the adjustment of the load transfer path based on the load transfer action instruction and distributed control technology.

[0010] In a preferred embodiment, obtaining the load nodes of the out - of - service equipment in the graph model and based on the connected - component analysis method to obtain the load path switching nodes specifically includes: obtaining the load nodes of the out - of - service equipment according to the graph model, and topologically traversing the load nodes based on the breadth - first search algorithm; and based on the topological traversal result and the connected - component analysis method, marking the load nodes of the out - of - service equipment as load path switching nodes.

[0011] In a preferred embodiment, the power grid topology map obtained by correcting the graph model to obtain the load path switching node is specifically as follows: the nodes and edges of the graph model are corrected, and path weights are set to obtain the power grid topology map; the path weights are obtained through the objective function and constraint conditions of the load path, and the objective function is constructed by calculating path first data based on load path data, and the path first data includes load path resistance, path power flow load, and response time of the device.

[0012] In a preferred embodiment, the generation of the load path switching scheme based on the shortest path algorithm is specifically as follows: based on the shortest path algorithm, the load paths of the load path switching nodes are gradually traversed and updated in real time through the power grid topology map; with the objective of minimizing the objective function of the load path in the path weights, the shortest load path switching scheme is generated through the constraint conditions.

[0013] In a preferred embodiment, the setting of the pre-switching adjustment strategy is specifically as follows: the load data of each load path switching node in the power grid is obtained in real time; based on the historical data and the load data of the load path switching node, the load change of the power grid is predicted according to the time series analysis algorithm, and the historical data includes historical load data; the load change of the power grid is compared and analyzed with a preset first threshold, and based on the adaptive control algorithm, the reactive power output of the reactive power compensation device and the synchronous compensation device is increased.

[0014] In a preferred embodiment, the generation of the load transfer action instruction based on the load path switching scheme is gradually executed, specifically as follows: the load bearing capacity of the standby device on the load switching path is obtained; dynamic priority sorting is performed according to the load capacity of the standby device, and load transfer is performed according to the priority order; path switching is performed based on the load path switching scheme, the original path switch is cut off, the switching path switch is turned on, and the load on the switching path is gradually increased. According to the sorting result, the load is transferred from the overhauled and out-of-service device to the standby device; based on the pre-switching adjustment strategy, the path load change is monitored in real time and reactive power compensation adjustment is synchronously performed.

[0015] In a preferred embodiment, the local control of the load transfer path adjustment based on the load transfer action instruction and the distributed control technology is specifically as follows: The power grid area is divided into several local control areas according to the load path switching nodes; a load transfer action instruction is set in each local control area and a cooperation mechanism is established; in combination with the load transfer action instruction, the load transfer path in the local area is switched once; based on the preset load unevenness formula, the load unevenness of the equipment after the first path switching is obtained and judged, and according to the judgment result, the secondary load path switching is triggered; the health assessment data of the standby equipment in different local control areas is obtained, and a health assessment model is constructed based on the BP neural network according to the health assessment data; the secondary load transfer path is obtained through the output of the health assessment model combined with the load path switching scheme, and based on the cooperation mechanism, the path switching is performed and the load transfer action instruction is executed; the load transfer path switching and the stop of the load transfer are controlled based on the load unevenness.

[0016] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: 1. By accurately analyzing the power grid topology through the connected component analysis method combined with the breadth-first search algorithm, the load nodes affected by the outage equipment can be effectively identified, so as to optimize the load switching path in real time. This method can improve the reliability and stability of the power grid while dynamically adjusting the power grid topology structure, reducing the power outage risk, and providing intelligent support for the power grid operation and maintenance.

[0017] 2. By correcting the power grid topology diagram, the load path switching nodes are accurately identified and calibrated, reducing the interference of irrelevant nodes and lines, thus effectively simplifying the search space of the shortest path algorithm and improving the efficiency of the load path switching. At the same time, the corrected topology diagram incorporates dynamic load information and equipment status, making the selection of the load path more accurate, avoiding risks such as overload and faults, and improving the stability and reliability of the power grid operation. In addition, the objective function constructed based on multi-dimensional factors such as the power flow load and resistance of the load path can dynamically optimize the load switching path in the shortest path algorithm, ensuring that the switching instruction not only meets the equipment capacity but also satisfies the system constraints, and finally realizing the optimization of the load path switching.

[0018] 3. By combining pre-switching adjustment and distributed control technology, the stability, reliability, and efficiency of power grid load switching have been significantly improved. Pre-switching adjustment can effectively reduce the impact of sudden load increase on the power grid, avoid problems such as overload and voltage fluctuations, and smoothly transfer the load through real-time monitoring and the assistance of reactive power compensation devices. Distributed control technology divides the power grid into multiple local control areas, enabling real-time and flexible adjustment of the load distribution in each area, avoiding the lag of single whole-network scheduling, and improving the response speed and control accuracy. The load unevenness feedback mechanism in local areas can ensure the reasonable distribution of the whole-network load, guaranteeing the overall stability and operation efficiency of the power grid. Overall, this solution optimizes the load switching process through accurate load forecasting, dynamic adjustment, and regional cooperation, reducing the system operation risk. Description of the Drawings

[0019] Figure 1 It is a schematic flowchart of the load transfer path regulation method based on the maintenance topology rule library provided by the embodiment of the present application.

[0020] Figure 2 It is a schematic structural diagram of the load transfer path regulation system based on the maintenance topology rule library provided by the embodiment of the present application. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1 Figure 1 It is a schematic flowchart of the load transfer path regulation method based on the maintenance topology rule library provided by the embodiment of the present application, including the following steps: S1. Construct a graph model, obtain the load nodes of the out-of-service equipment in the graph model, and based on the connected component analysis method, obtain the load path switching nodes.

[0023] The maintenance topology rule library is an important tool in power system operation and maintenance and load regulation. It usually contains the topology change rules under various maintenance operations in the power grid. These rules clarify how to adjust and control the operation topology structure of the power grid in different maintenance scenarios to ensure the reliability and stability of the power grid during maintenance. The maintenance topology rule library mainly includes content such as equipment maintenance constraints, topology structure, maintenance scheduling operation logic, and safety verification rules.

[0024] Construct a graph model, obtain the load nodes of the out-of-service equipment in the graph model, and based on the connected component analysis method, obtain the load path switching nodes. Specifically: Obtain the topological structure data of the power grid based on the maintenance topology rule library and construct a graph model. The topological structure data includes substations, switch states, transmission lines, and load nodes; The construction of the graph model is specifically as follows: Define the nodes of the graph model based on substations and load nodes, and define the edges of the graph model based on switch states and transmission lines; Construct a graph model according to the connection methods of each node and edge. The connection methods include the number of line connections between nodes and the switch states between substations and load nodes; Obtain the load nodes of the out-of-service equipment according to the graph model; Based on the connected component analysis method, perform a topological traversal on the load nodes of the out-of-service equipment based on the breadth-first search algorithm; According to the topological traversal results, mark the load nodes of each out-of-service equipment that has lost power supply as load path switching nodes.

[0025] It should be noted that when performing connected component analysis, it is first necessary to obtain the out-of-service equipment or disconnected lines. The outage and disconnection of these equipment or lines will cause some nodes to be unable to access other nodes. Assume that a certain substation is out of service, then all the lines connected to this substation need to be marked as disconnected and these connection relationships are removed. Performing a topological traversal based on the breadth-first search algorithm can be understood as starting from a node and expanding layer by layer to access all other nodes that can be directly or indirectly connected to the load nodes of the out-of-service equipment. According to the connected component analysis results, check whether each load node still belongs to the connected component containing an effective power source. If a load node is not in any connected component, it has lost power supply and needs to perform a load switch. Through the connected component analysis method, it is possible to accurately identify which load nodes are affected by the out-of-service equipment and cannot continue to obtain power. At this time, based on these results, the load switching path can be optimized to ensure that power continues to be supplied to all load nodes and avoid power outages or grid overloads.

[0026] S2. Modify the graph model to obtain the power grid topology graph of the load path switching nodes, and generate a load path switching scheme based on the shortest path algorithm. Specifically: The key to modifying the graph model lies in accurately identifying the load path switching nodes, that is, those nodes that need to reallocate loads during maintenance, faults, or other operations. These nodes may be disconnected, overloaded, or devices to be switched. By identifying these nodes as load path switching nodes, the positions of these key nodes can be clarified in the shortest path algorithm, making the load switching path more accurate and avoiding misselecting irrelevant paths or unsuitable devices. And it can effectively simplify the search space of the shortest path algorithm. The unmodified graph model may contain many irrelevant nodes and lines, making the path search complex and time-consuming. While the modified graph model will streamline the key path nodes according to the real-time topology and load status of the power grid, reducing ineffective calculations. The modified graph model is not only the topological structure of the lines but also contains the dynamic information of the load status. By modifying the graph model, it can indicate which nodes and lines have the risk of load imbalance, which lines are currently close to the maximum load capacity, and which devices are in the maintenance state, etc. This provides richer weight information for the shortest path algorithm and can select the optimal path during load switching.

[0027] Modify the graph model to obtain the power grid topology graph of the load path switching nodes, specifically as follows: Modify the nodes of the graph model to standby devices and load path switching nodes, modify the edges of the graph model to load paths and switch states, and set path weights on each edge to obtain the power grid topology graph; Obtain load path data, and calculate the first path data based on the load path data according to a preset calculation formula. The first path data includes path power flow load, load path impedance, and response time of the device. The load path data includes path power transmission load, voltage amplitude between nodes, voltage phase angle, reactive power of the path, resistance and reactance of the path, line temperature, maximum load capacity of the path, and maximum load capacity of the device; Construct the objective function of the load path according to the first path data and set the constraint conditions; Use the objective function and constraint conditions of the load path as the path weights.

[0028] The load path impedance, the specific calculation formula is as follows:

[0029] The path power flow load, the specific calculation formula is as follows:

[0030] The response time of the device, the specific calculation formula is as follows:

[0031] In the formula, is the response time of the device, is the reference response time of the device, is the maximum load capacity of the path, is the line voltage, is the rated line voltage, is the path power flow load, is the node voltage amplitude of, is the node voltage amplitude of, is the node and the node line impedance between, is the node voltage phase angle of, voltage phase angle of the node is, is the amplitude of voltage fluctuation on the path, is the reactive power of the path, is the regulation coefficient for controlling the influence of voltage fluctuation on power flow load, is the resistance of the path, is the reactance of the path, is the current temperature of the line, is the standard temperature of the line, is the line load, is the maximum load capacity of the device, is the regulation coefficient for controlling the influence of temperature change on impedance, is the regulation coefficient for controlling the influence of load change on impedance.

[0032] It should be noted that in power grid load switching and path optimization, line power flow load, line impedance, and equipment response time are the key factors affecting load transfer. The line power flow load is not only determined by voltage, impedance, and phase angle difference, but also closely related to other dynamic factors in the power grid (such as power factor, voltage fluctuation, etc.). The calculation formula of the path power flow load introduces the influence of voltage fluctuation and power factor on the basis of standard power transmission, making the calculation of power flow load more complex and dynamic. Through this formula, the influence of changes in voltage and reactive power in the power grid on line load can be considered. Line impedance directly affects the flow of current, and thus affects power transmission efficiency and loss. In an actual power grid, line impedance is not only affected by line material and length, but also related to factors such as temperature, load status, and equipment loss. The calculation formula of the load path impedance takes into account the dynamic changes of temperature, load status, and line carrying capacity, so as to calculate line impedance more accurately and avoid current overload or excessive power loss when the load is heavy. Equipment response time refers to the time when equipment (such as switches, transformers, buses, etc.) responds and completes load transfer when a fault occurs or load switching occurs in the power grid. Equipment response time is affected by various factors, such as the type of equipment, the speed of load change, and the efficiency of the power grid control system. The calculation formula of the response time of the equipment comprehensively considers factors such as load, maximum carrying capacity of the equipment, voltage, and power load, and can dynamically adjust the equipment response time. When the load is large or the voltage fluctuation is large, the response time of the equipment will increase, resulting in a delay in the load transfer process. The load path switching node contains equipment that is out of service for maintenance.

[0033] The objective function of the load path is specifically calculated as follows:

[0034] In the formula, is the objective function of the load path, is the path power flow load, is the node and the node The line impedance between them, is the response time of the equipment, , , Are weight coefficients respectively, Is the set of load switching paths, that is, all feasible paths for load switching from node And node .

[0035] The constraint conditions are specifically:

[0036]

[0037]

[0038] Among them, is the path flow load, is the maximum load capacity of the device, is the node and the node is the line impedance between them, is the response time of the device, is the maximum impedance value set according to the power grid design and line characteristics, is the maximum allowable time for the device to respond, is for load switching from node to node all feasible paths is the load switching path set.

[0039] The load path switching scheme generated based on the shortest path algorithm is specifically as follows: Based on the shortest path algorithm, traverse the load paths of the load path switching nodes through the power grid topology diagram; Calculate the path weights of each load path respectively with the objective function of minimization, and under the condition of meeting the constraint conditions, compare and analyze the path weights, and select the path with the smallest path weight as the load path switching scheme.

[0040] S3. Set the pre-switching adjustment strategy, and generate load transfer action instructions based on the load path switching scheme and execute them step by step.

[0041] Setting the pre-switching adjustment strategy before load path switching can effectively improve the stability, reliability and operation efficiency of the power grid. The purpose of pre-switching adjustment is to reduce the possible unstable factors and risks in the power grid during the load path switching process, so as to ensure the smooth progress of the switching operation and avoid the impact on the power grid caused by sudden load increase. When the load path is switched, the load of the power grid will be redistributed, which may cause some lines or equipment to bear sudden load increase. Without prior adjustment, this sudden increase may cause problems such as overload and voltage fluctuation, and even may lead to equipment failure. Through pre-switching adjustment, such as starting standby equipment, adjusting load distribution and reactive power compensation, the load can be smoothly transferred from the out-of-service equipment to other equipment, avoiding the load impact caused by sudden increase.

[0042] The setting of the pre-switching adjustment strategy is specifically as follows: Obtain the load data of each load path switching node in the power grid in real time; Based on historical data and the load data, predict the load change of the power grid during switching according to the time series analysis algorithm. The historical data includes historical load data. Compare and analyze the load change of the power grid with a preset first threshold. If the load change of the power grid is higher than the preset first threshold, based on the adaptive control algorithm, control the reactive power output of the reactive power compensation device and the synchronous compensation device, and synchronously adjust the load change of the power grid to restore stability.

[0043] It should be noted that the adjustment of the load change of the power grid to restore stability can be understood as that the load change of the power grid is lower than the preset first threshold.

[0044] Based on the load path switching scheme, generate a load transfer action instruction and execute it step by step. Specifically: The system dispatching center confirms the load path switching scheme and obtains the load bearing capacity of the standby equipment on the load switching path. Perform dynamic priority sorting based on the load capacity of the standby equipment, and transfer the load according to the priority order. The priority order is sorted from large to small according to the load bearing capacity. When performing path switching based on the load path switching scheme, cut off the original path switch, connect the switching path switch, and gradually increase the load on the switching path. Based on the sorting result, transfer the load from the overhauled and out-of-service equipment to the standby equipment. If the load bearing capacity of the current standby equipment can no longer accept the load, switch the standby equipment on the current load path. Based on the pre-switching adjustment strategy, every time the load increases, monitor the path load change in real time and synchronously perform reactive power compensation adjustment to prevent unbalanced load increase.

[0045] S4. Based on the load transfer action instruction and distributed control technology, perform local control on the regulation of the load transfer path.

[0046] Divide the power grid into multiple local control areas. The dynamic change of the load can be quickly adjusted through local strategies, avoiding the lag of a single whole-network regulation and improving the flexibility and real-time response ability of load allocation. The whole-network dispatching system can adjust the load transfer path in real time to ensure the reasonable sharing of the load between different local areas, avoid overloading of a certain local area, and ensure the load balance and stability of each area of the power grid. By dividing the local control areas and managing the load transfer action instructions, the burden on the whole-network dispatching system can be effectively dispersed. Each local control area independently manages the load adjustment within its own area, reducing the pressure on the whole-network dispatching system and improving the overall efficiency of the system.

[0047] Combined with the load transfer action instruction, perform local control on the regulation of the load transfer path through distributed control technology. Specifically: Divide the power grid area into several local control areas according to the load path switching nodes; Set load transfer action instructions in each local control area and establish a cooperation mechanism between different local control areas; Combined with the load transfer action instructions, perform a primary switching of the load transfer path within the local area; Obtain the load unevenness of the equipment after the primary path switching based on a preset load unevenness formula and make a determination based on a preset load safety threshold. If the load unevenness exceeds the preset load safety threshold, trigger a secondary load path switching according to the determination result; Obtain the health assessment data of the standby equipment in different local control areas, and construct a health assessment model based on the BP neural network according to the health assessment data. The health assessment data includes load impact data, equipment aging data, and equipment maintenance data; Obtain the secondary load transfer path by combining the output of the health assessment model with the load path switching scheme. Based on the cooperation mechanism, perform path switching and execute the load transfer action instructions. The combination of the output of the health assessment model and the load path switching scheme can be understood as that the better the health of the standby equipment according to the larger the output of the health assessment model, and then find the optimal secondary switching path in combination with the load path switching scheme; Control the load transfer path switching and load transfer stop based on the load unevenness. After the secondary load path switching, calculate the load unevenness again. If it is lower than the preset load safety threshold, stop the control.

[0048] The specific calculation formula of the load unevenness is as follows:

[0049] In the formula, is the load unevenness, is the total equipment, is the active power of the th overhauled and out-of-service equipment, is the reactive power of the th overhauled and out-of-service equipment, is the load capacity of the th overhauled and out-of-service equipment, is the average active power of the total equipment,

[0050] It should be noted that and Quantify the deviation of each overhauled and out-of-service device from the average load of the entire network, and standardize it according to the load capacity of the overhauled and out-of-service device. This ensures that the impact of overhauled and out-of-service devices with large load differences is amplified in the formula, while the impact of those with small load differences is smaller.

[0051] The specific calculation formula for the load impact data is as follows:

[0052] The specific calculation formula for the health assessment model is as follows:

[0053] In the formula, is the health assessment degree, is the load impact data, is the average load of the device over a past period, is the rated load of the standby device, is the number of years the standby device has been in use, is the rated life of the standby device, is the number of regular maintenance times of the standby device, is the number of historical failures, and and are weight coefficients respectively.

[0054] It should be noted that the load impact data is the ratio of the current load of the device to its rated load, the device aging data is to measure the service life of the device, and the device maintenance data is to measure the maintenance situation of the device. is the calculation formula for the device aging data, is the device maintenance data. The larger the output of the health assessment model, the better the health assessment degree of the standby device.

[0055] Embodiment 2, Figure 2 This is a schematic structural diagram of a load transfer path regulation system based on an overhaul topology rule library provided by an embodiment of the present application, including a path switching node acquisition module, a load path switching scheme generation module, a load transfer action instruction execution module, and a load transfer path local control module, and there are connections between the modules: The path switching node acquisition module is used to construct a graph model, obtain the load nodes of the out-of-service devices in the graph model, and obtain the load path switching nodes based on the connected component analysis method; The load path switching scheme generation module is used to correct the graph model to obtain the power grid topology graph of the load path switching nodes, and generate a load path switching scheme based on the shortest path algorithm; A load transfer action instruction module is used to set a pre-switching adjustment strategy, and based on a load path switching scheme, generate a load transfer action instruction to be executed step by step; A local control module for the load transfer path is used to perform local control on the adjustment of the load transfer path based on the load transfer action instruction and distributed control technology.

[0056] All of the above formulas are dimensionless and take their numerical values for calculation. The formula is obtained by collecting a large amount of data and performing software simulation to obtain a formula that is closest to the actual situation. The preset parameters in the formula are set by those skilled in the art according to the actual situation.

[0057] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product.

[0058] Those of ordinary skill in the art can realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0059] In addition, the functional modules in each embodiment of this application can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module.

[0060] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0061] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A load transfer path control method based on a maintenance topology rule base, characterized in that: The steps include: Construct a graphical model, obtain the load nodes of the outage equipment in the graphical model, and obtain the load path switching nodes based on the connected component analysis method; The graph model is modified to obtain the grid topology of the load path switching node, and a load path switching scheme is generated based on the shortest path algorithm; Set up a pre-switching adjustment strategy, generate load transfer action instructions based on the load path switching plan, and execute them step by step; Based on load transfer action instructions and distributed control technology, local control is performed on the load transfer path adjustment.

2. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: The load nodes of the outage equipment in the graph model are obtained and the load path switching nodes are obtained based on the connected component analysis method, specifically: Obtain the load nodes of the outage equipment according to the graph model, and perform topological traversal on the load nodes based on a breadth-first search algorithm; According to the topology traversal results and based on the connected component analysis method, the load nodes of the outage equipment are marked as load path switching nodes.

3. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: The power grid topology diagram of the load path switching node is obtained by modifying the graph model, specifically: Modify the nodes and edges of the graph model and set the path weights to obtain the power grid topology map; The path weight is obtained through the objective function and constraint conditions of the load path. The objective function is constructed by calculating the first path data based on the load path data. The first path data includes the load path resistance, path flow load and the response time of the equipment.

4. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: The load path switching scheme is generated based on the shortest path algorithm, specifically: Based on the shortest path algorithm, the load path of the load path switching node is gradually traversed through the power grid topology diagram and updated in real time; Taking the objective function of minimizing the load path in the path weight as the goal, the shortest load path switching plan is generated through constraint conditions.

5. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: The setting of the pre-switching adjustment strategy is specifically as follows: Obtain load data of each load path switching node in the power grid in real time; Based on historical data and load data of load path switching nodes, predicting load changes of the power grid according to a time series analysis algorithm, wherein the historical data includes historical load data; Comparison and analysis are performed based on the load change of the power grid and a preset first threshold value, and based on an adaptive control algorithm, the reactive power output of the reactive compensation device and the synchronous compensation device is increased.

6. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: Based on the load path switching scheme, the load transfer action instructions are generated and executed step by step, specifically: Obtain the load carrying capacity of the standby equipment on the load switching path; Dynamically prioritize the load capacity of backup equipment and transfer load according to the priority order; Execute path switching based on the load path switching plan, cut off the original path switch, turn on the switch path switch, and gradually increase the load on the switch path. According to the sorting results, transfer the load from the maintenance and shutdown equipment to the standby equipment; Based on the pre-switching adjustment strategy, the path load changes are monitored in real time and the reactive power compensation is controlled synchronously for adjustment.

7. The load transfer path control method based on the maintenance topology rule base according to claim 1 is characterized in that: The local control of load transfer path adjustment based on load transfer action instructions and distributed control technology is specifically as follows: Divide the power grid area into several local control areas according to the load path switching nodes; Set up load transfer action instructions and establish a collaboration mechanism in each local control area; Combined with the load transfer action instruction, the load transfer path in the local area is switched; Obtaining and judging the load unevenness of the equipment after the primary path switching based on a preset load unevenness formula, and triggering the secondary load path switching according to the judgment result; Obtain health assessment data of backup equipment in different local control areas, and build a health assessment model based on the BP neural network according to the health assessment data; The output of the health assessment model is combined with the load path switching scheme to obtain the secondary load transfer path, and based on the collaboration mechanism, the path is switched and the load transfer action instructions are executed; The load transfer path switching and the stopping of the load transfer are controlled based on the load unevenness.

8. The load transfer path control method based on the maintenance topology rule base according to claim 3 is characterized in that: The load path resistance is specifically calculated as follows: The specific calculation formula of the path flow load is as follows: The specific calculation formula for the response time of the device is as follows: In the formula, is the response time of the device, is the benchmark response time of the device, is the maximum load capacity of the path, is the line voltage, is the line rated voltage, is the path power flow load, For Node The voltage amplitude, For Node The voltage amplitude, For Node With Node The line impedance between For Node The voltage phase angle, Node Voltage phase angle, is the amplitude of voltage fluctuation on the path, is the reactive power of the path, In order to control the regulation coefficient of voltage fluctuation on power flow load, is the resistance of the path, is the reactance of the path, is the current temperature of the line, is the line standard temperature, is the line load, is the maximum load capacity of the equipment, To control the adjustment coefficient of the effect of temperature change on resistance, It is the adjustment coefficient to control the effect of load change on resistance.

9. The load transfer path control method based on the maintenance topology rule base according to claim 7 is characterized in that: The specific calculation formula of the load unevenness is as follows: The specific calculation formula of the load unevenness is as follows: In the formula, is the load unevenness, For the total equipment, For the Active power of equipment shut down for maintenance, For the The reactive power of the equipment shut down for maintenance, For the first The load capacity of the equipment shut down for maintenance, is the average active power of the total equipment, Average reactive power of the total equipment.

10. A system using the load transfer path control method based on the maintenance topology rule base as described in any one of claims 1 to 9, characterized in that: It includes a path switching node acquisition module, a load path switching plan generation module, a load transfer action instruction execution module, and a load transfer path local control module. There are connections between the modules: A path switching node acquisition module is used to construct a graph model, obtain the load nodes of the outage equipment in the graph model, and obtain the load path switching nodes based on the connected component analysis method; A load path switching scheme generation module is used to modify the graph model to obtain a power grid topology graph of the load path switching node, and generate a load path switching scheme based on the shortest path algorithm; The load transfer action instruction module is used to set the pre-switching adjustment strategy and generate load transfer action instructions based on the load path switching plan for step-by-step execution; The load transfer path local control module is used to perform local control on the load transfer path adjustment based on the load transfer action instruction and distributed control technology.

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