A safety protection system and method for power transmission and distribution system maintenance

Abstract

The present application provides a safety protection system and method for the maintenance of a power transmission and distribution system. The system determines the load transfer characteristics of each maintenance area to the transmission load in the power transmission and distribution network through the line redundancy of each maintenance area in the power transmission scheduling and all transmission loads; determines the load fluctuation entropy of power distribution in each maintenance area in the power transmission and distribution network, and determines the load safety constraints of the power transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area; determines the safety confidence of each maintenance area in the power transmission and distribution network during power transmission and distribution system maintenance through each transfer characteristic and each load safety constraint, and then issues safety protection warnings to each maintenance area during power transmission and distribution system maintenance based on each safety confidence. Based on the above scheme, confidence safety warnings in power transmission and distribution system maintenance can be realized.

Description

Technical Field

[0001] The present application relates to the field of power transmission and distribution safety technology, and more specifically, to a safety protection system and method for maintaining a power transmission and distribution system. Background Art

[0002] With the continuous increase in global electricity demand, especially the electricity demand in the process of industrialization and urbanization, the load on the power grid continues to rise, which puts higher requirements on the reliability and safety of the transmission and distribution system. At the same time, with the large-scale access of renewable energy, the load volatility and uncertainty of the power grid increase, which also brings challenges to the stability of the transmission and distribution network.

[0003] Traditional safety early warning methods for transmission and distribution systems usually regard distribution and transmission systems as relatively independent modules, but lack a comprehensive assessment of the synergy between the two, and fail to effectively consider the interaction and mutual influence between the two. For example, load fluctuations in the distribution network may affect the load flow direction of the transmission line, and changes in the state of the transmission line may also have a feedback effect on the downstream distribution system. Traditional methods are unable to capture this two-way interactive relationship, resulting in significant limitations in the actual application of load scheduling and risk early warning models. This limitation makes the traditional early warning mechanism often unable to accurately and comprehensively reflect the load changes and potential risks in various areas of the power grid. Especially when the power grid load distribution is complex and the load fluctuations are frequent, the early warning effect is relatively slow or inaccurate. Therefore, how to achieve confident safety early warning in the maintenance of transmission and distribution systems is a difficult problem faced by the industry. Summary of the Invention

[0004] The present application provides a safety protection system and method for power transmission and distribution system maintenance, which can realize reliable safety warning in power transmission and distribution system maintenance.

[0005] In a first aspect, the present application provides a safety early warning method for power transmission and distribution system maintenance, comprising:

[0006] When the power transmission and distribution system transmits and distributes power to various maintenance areas in the power transmission and distribution network, it monitors the power transmission load of each transmission line in the power transmission and distribution network;

[0007] Determine the line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network, and determine the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads;

[0008] Determine the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network, and determine the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the transmission and distribution system;

[0009] The safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system is determined by the transfer characteristics of the transmission load in each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area. Then, based on each safety confidence, a safety protection warning is issued to each maintenance area during the maintenance of the transmission and distribution system.

[0010] In some embodiments, determining the line redundancy of each maintenance area in the transmission and distribution network in the power transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network specifically includes:

[0011] Obtaining the grid topology of transmission lines in the transmission and distribution network;

[0012] For each maintenance area in the transmission and distribution network, quantifying the dispatching possibility of each transmission line when the transmission and distribution network performs power transmission dispatching on the maintenance area through the grid topology structure;

[0013] The line redundancy of the maintenance area in the transmission scheduling is determined through all scheduling possibilities, and then the line redundancy of each maintenance area in the transmission scheduling in the transmission and distribution network is obtained.

[0014] In some embodiments, determining the load transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads specifically includes:

[0015] For each maintenance area, the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission dispatching in the maintenance area are extracted from the line redundancy of the maintenance area;

[0016] Determine the load transfer capacity of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area through each scheduling redundancy feature and all transmission loads;

[0017] The load transfer characteristics of the maintenance area to the transmission load in the transmission and distribution network are determined according to all the load transfer capacities, and then the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are obtained.

[0018] In some embodiments, determining the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network specifically includes:

[0019] Obtain distribution load records for each maintenance area in the transmission and distribution network;

[0020] For each maintenance area in the transmission and distribution network, the load average of the maintenance area at different time nodes is extracted from the distribution load records of the maintenance area;

[0021] The load fluctuation entropy of the power distribution in the maintenance area is determined by the mean value of all loads, and then the load fluctuation entropy of the power distribution in each maintenance area in the transmission and distribution network is obtained.

[0022] In some embodiments, determining the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of the power distribution in each maintenance area and the load distribution characteristics of the power transmission and distribution network in the power transmission and distribution system specifically includes:

[0023] Obtain load distribution characteristics of the transmission and distribution network from the transmission and distribution system;

[0024] For each maintenance area, extracting the constraints of the power distribution load in the maintenance area from the load distribution characteristics;

[0025] The load safety constraints during power distribution in the maintenance area are determined by the constraint conditions and the load fluctuation entropy of power distribution in the maintenance area, thereby obtaining the load safety constraints during power distribution in each maintenance area by the transmission and distribution network.

[0026] In some embodiments, determining the safety confidence level of each maintenance area in the transmission and distribution network during power transmission and distribution system maintenance based on the transfer characteristics of the power transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area specifically includes:

[0027] For each maintenance area in the transmission and distribution network, the load transfer characteristics and load security constraints of the maintenance area are integrated into the load fusion constraints of the maintenance area;

[0028] The load fusion constraint is used to perform confidence constraints on the current load state of the maintenance area, and the safety confidence of the maintenance area in the maintenance of the power transmission and distribution system is obtained, and then the safety confidence of each maintenance area in the power transmission and distribution network in the maintenance of the power transmission and distribution system is obtained.

[0029] In some embodiments, providing safety protection warnings for various maintenance areas during maintenance of the power transmission and distribution system based on various safety confidence levels specifically includes:

[0030] Obtaining load safety thresholds for transmission and distribution system maintenance;

[0031] The maintenance area corresponding to the safety confidence level below the load safety threshold is used as the warning area for safety protection warning.

[0032] In a second aspect, the present application provides a safety protection system for maintaining a power transmission and distribution system, including a safety warning unit, wherein the safety warning unit includes:

[0033] A monitoring module, configured to monitor the transmission load of each transmission line in the transmission and distribution network when the transmission and distribution system transmits and distributes power to each maintenance area in the transmission and distribution network;

[0034] a processing module, configured to determine line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network, and determine load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads;

[0035] The processing module is further configured to determine the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network, and determine the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the power transmission and distribution system;

[0036] An execution module is used to determine the safety confidence level of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system through the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then to provide safety protection warnings for each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence level.

[0037] In a third aspect, the present application provides a computer device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the above-mentioned safety warning method for maintenance of a power transmission and distribution system.

[0038] In a fourth aspect, the present application provides a computer-readable storage medium, which stores instructions or codes. When the instructions or codes are run on a computer, the computer implements the above-mentioned safety warning method for power transmission and distribution system maintenance.

[0039] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects:

[0040] The present application provides a safety protection system and method for the maintenance of a power transmission and distribution system. When the power transmission and distribution system transmits and distributes power to each maintenance area in the transmission and distribution network, the transmission load of each transmission line in the transmission and distribution network is monitored; the line redundancy of each maintenance area in the transmission and distribution network in the transmission scheduling is determined through the grid topology of the transmission lines in the transmission and distribution network, and the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are determined based on the line redundancy of each maintenance area and all transmission loads; the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network is determined, and the load safety constraints of the power distribution network when distributing power to each maintenance area are determined based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the power distribution network in the transmission and distribution system; the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the power transmission and distribution system is determined based on the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints of the power distribution network when distributing power to each maintenance area, and then a safety protection warning is issued to each maintenance area during the maintenance of the power transmission and distribution system based on each safety confidence.

[0041] It can be seen that in this application, the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system is determined by the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then a safety protection warning is given to each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence; first, determining the load transfer characteristics not only helps to measure the flexibility and adaptability of the power grid in the face of load fluctuations, but also can identify potential risks in the transmission and distribution system, especially when certain lines or areas are overloaded or overloaded. By integrating the load transfer characteristics, the transmission and distribution system can more accurately predict the distribution and change trend of the load, thereby improving the accuracy and timeliness of the warning. When the load transfer characteristics are combined with the safety confidence, the load in different areas can be monitored and evaluated in real time. Load changes can be predicted, thereby ensuring that the power grid can be dynamically adjusted during peak load periods and reducing the risk of power outages or system crashes. Then, by reasonably setting load safety constraints, a clear load limit can be provided for the transmission and distribution system to avoid damage to power equipment or power outages caused by excessive loads. Determining the load fluctuation entropy can quantify the disorder and complexity of load fluctuations, further predict the potential risks of load changes, and ensure that the transmission and distribution system can quickly adjust and recover when the load fluctuates. After integrating safety constraints with load transfer characteristics, a more accurate safety early warning mechanism can be provided to monitor the load status of the power grid in real time and issue early warnings in time when the transmission and distribution system faces overload or instability, avoiding accidents and ensuring the reliability and safety of power grid operation. In summary, based on the above scheme, a confident safety early warning in the maintenance of the transmission and distribution system can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 is an exemplary flow chart of a safety warning method for power transmission and distribution system maintenance according to some embodiments of the present application;

[0044] Figure 2 is a transmission flow chart of a power transmission and distribution system according to some embodiments of the present application;

[0045] Figure 3 is a schematic diagram of a process for determining security confidence according to some embodiments of the present application;

[0046] Figure 4 is a schematic structural diagram of a safety warning unit according to some embodiments of the present application;

[0047] Figure 5 It is a structural diagram of a computer device for implementing a safety warning method for power transmission and distribution system maintenance according to some embodiments of the present application. DETAILED DESCRIPTION

[0048] In order to better understand the technical solution of the present application, the technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0049] refer to Figure 1 , which is an exemplary flow chart of a safety warning method for power transmission and distribution system maintenance according to some embodiments of the present application. The safety warning method for power transmission and distribution system maintenance mainly includes the following steps:

[0050] In step 101, when the power transmission and distribution system transmits and distributes power to each maintenance area in the power transmission and distribution network, the power transmission load of each power transmission line in the power transmission and distribution network is monitored.

[0051] In specific implementation, when the power transmission and distribution system transmits and distributes power to various maintenance areas in the power transmission and distribution network, a current sensor is used to monitor the transmission current of each transmission line in the power transmission and distribution network at the current moment, and the transmission current can be used as the transmission load of the transmission line.

[0052] It should be noted that, in this application, the transmission load refers to the power load transmitted on the transmission line; the transmission and distribution network refers to the overall power network composed of the transmission network and the distribution network, which is responsible for the transmission and distribution of electricity from the power plant to the end user; the transmission line refers to the power transmission line connecting the power generation and distribution network, which is used to transmit electric energy from the power source to each distribution area; the maintenance area is the power grid area used for regular inspection, repair and maintenance.

[0053] In some embodiments, reference Figure 2 As described above, the figure is a transmission flow chart of the power transmission and distribution system shown in some embodiments of the present application. The figure shows the transmission process of electricity from the power plant to the user. First, the generator in the power plant generates electricity with a voltage of 6.3 to 20 kV, and then the voltage is increased to 220 to 500 kV through a step-up transformer so that it can be transmitted over long distances through high-voltage transmission lines; during the power transmission process, it will pass through the regional substation, where the voltage is reduced to 35 to 110 kV through a step-down transformer, and then distributed through high-voltage distribution lines; then, the electricity passes through the step-down transformer again to reduce the voltage to 6 to 10 kV, and is further distributed to a wider area through high-voltage distribution lines.

[0054] Before reaching the user, the electricity passes through a step-down transformer, where the voltage is reduced to 0.38 / 0.22 kV. This forms the low-voltage distribution line, ultimately delivering the electricity safely to the user. Throughout this process, transformers play a key role in the rise and fall of voltage, while transmission and distribution lines are responsible for the transmission and distribution of electricity. This layered voltage regulation and transmission method ensures the efficiency and safety of electricity during long-distance transmission, while also meeting the voltage level requirements of different users.

[0055] The diagram details each link in the power transmission process, from power plants to end users, including key components such as step-up transformers, high-voltage transmission lines, step-down transformers, high-voltage distribution lines, and low-voltage distribution lines. Each link corresponds to a specific voltage level, from 6.3 to 20 kV at the power plant, to 220 to 500 kV after stepping up, to 35 to 110 kV at regional substations, and finally to 0.38 / 0.22 kV at the end user. This not only optimizes power transmission efficiency but also ensures the stability and security of power supply. Through the process outlined in the diagram, power can be efficiently and safely transmitted from power plants to end users, meeting the needs of different scales and types of users.

[0056] In step 102, the line redundancy of each maintenance area in the transmission and distribution network in the transmission scheduling is determined based on the grid topology of the transmission lines in the transmission and distribution network, and the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are determined based on the line redundancy of each maintenance area and all transmission loads.

[0057] In some embodiments, determining the line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network can be achieved by using the following steps:

[0058] Obtaining the grid topology of transmission lines in the transmission and distribution network;

[0059] For each maintenance area in the transmission and distribution network, quantifying the dispatching possibility of each transmission line when the transmission and distribution network performs power transmission dispatching on the maintenance area through the grid topology structure;

[0060] The line redundancy of the maintenance area in the transmission scheduling is determined through all scheduling possibilities, and then the line redundancy of each maintenance area in the transmission scheduling in the transmission and distribution network is obtained.

[0061] In specific implementation, first, the grid topology structure of the transmission lines in the transmission and distribution network is obtained, which can be achieved in the following manner, namely: the grid topology structure of the transmission lines in the transmission and distribution network can be obtained from the control console of the transmission and distribution system; then, for each maintenance area in the transmission and distribution network, the scheduling possibility of each transmission line when the transmission and distribution network performs transmission scheduling on the maintenance area through the grid topology structure is quantified, which can be achieved in the following manner, namely: for each maintenance area in the transmission and distribution network, a path planning algorithm is used to plan the transmission scheduling lines of the maintenance area in the grid topology structure, thereby obtaining multiple scheduling lines, and obtaining the usage probability of each scheduling line from the planning results, and counting the usage times of each transmission line from the multiple scheduling lines. For each transmission line, the product of the number of times the transmission line is used and the probability of use of the corresponding dispatching line for the transmission line can be divided by the sum of all usage times as the dispatching possibility of the transmission line. The above method can be used to obtain the dispatching possibility of each transmission line when the transmission and distribution network performs transmission dispatch on the maintenance area; finally, the line redundancy of the maintenance area in transmission dispatch is determined by all dispatching possibilities, and then the line redundancy of each maintenance area in the transmission and distribution network in transmission dispatch is obtained. This can be achieved in the following way: the difference between the sum of all dispatching possibilities and 1 can be used as the line redundancy of the maintenance area in transmission dispatch. The above method can be used to obtain the line redundancy of each maintenance area in the transmission and distribution network in transmission dispatch.

[0062] It should be noted that, in this application, line redundancy refers to the degree of redundancy of the lines that the maintenance area can choose to share in transmission scheduling. The higher the redundancy, the more the maintenance area can share the load through more transmission lines when a transmission line fails, thereby ensuring the stable operation of the power grid; the network topology refers to the spatial connection relationship between each transmission line in the transmission and distribution network; the scheduling possibility indicates the probability of use of each transmission line when the maintenance area performs transmission scheduling.

[0063] In some embodiments, determining the load transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads can be achieved by using the following steps:

[0064] For each maintenance area, the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission dispatching in the maintenance area are extracted from the line redundancy of the maintenance area;

[0065] Determine the load transfer capacity of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area through each scheduling redundancy feature and all transmission loads;

[0066] The load transfer characteristics of the maintenance area to the transmission load in the transmission and distribution network are determined according to all the load transfer capacities, and then the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are obtained.

[0067] In the specific implementation, first, for each maintenance area, the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area are extracted from the line redundancy of the maintenance area. This can be achieved in the following way, namely: for each maintenance area, the ratio of the dispatching possibility of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area to the line redundancy can be used as the dispatching redundancy characteristics of the corresponding transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area, and the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area can be obtained; then, the load transfer capacity of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area is determined by using each dispatching redundancy characteristic and all transmission loads. This can be achieved in the following way, namely: for each transmission line, a multivariate regression model is constructed to transform the transmission line The dispatching redundancy characteristics and transmission load are combined to calculate the load transfer capacity of the transmission line, that is, load transfer capacity = a*dispatching redundancy characteristics+b*transmission load+c, where a, b, and c are parameters of the multivariate regression model, which are obtained by training with historical operation data. The load transfer capacity of each transmission line when the transmission and distribution network performs transmission dispatch on the maintenance area can be obtained through the above method; finally, the load transfer characteristics of the maintenance area to the transmission load in the transmission and distribution network are determined based on all load transfer capacities, and then the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are obtained. This can be achieved in the following way, that is, the set of all load transfer capacities is used as the load transfer characteristics of the maintenance area to the transmission load in the transmission and distribution network. The load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network can be obtained through the above method.

[0068] It should be noted that, in this application, the load transfer characteristic refers to the characteristics of the transmission load transferred between different transmission lines, and the load transfer characteristic reflects the flexibility of the system in load regulation under different scheduling conditions; the scheduling redundancy characteristic refers to the backup load that the transmission and distribution network can accommodate under different scheduling schemes; the load transfer capacity is a quantitative value reflecting the relationship between load scheduling and transmission capacity.

[0069] In step 103, the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network is determined, and the load safety constraints of the transmission and distribution network when distributing power to each maintenance area are determined based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the transmission and distribution system.

[0070] In some embodiments, determining the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network can be achieved by using the following steps:

[0071] Obtain distribution load records for each maintenance area in the transmission and distribution network;

[0072] For each maintenance area in the transmission and distribution network, the load average of the maintenance area at different time nodes is extracted from the distribution load records of the maintenance area;

[0073] The load fluctuation entropy of the power distribution in the maintenance area is determined by the mean value of all loads, and then the load fluctuation entropy of the power distribution in each maintenance area in the transmission and distribution network is obtained.

[0074] In specific implementation, first, obtaining the distribution load records of each maintenance area in the transmission and distribution network can be achieved in the following way, namely: the distribution load records of each maintenance area in the transmission and distribution network within a specified time period can be obtained from the data storage database of the transmission and distribution network; then, for each maintenance area in the transmission and distribution network, the load average of the maintenance area at different time nodes is extracted from the distribution load records of the maintenance area, which can be achieved in the following way, namely: for each maintenance area in the transmission and distribution network, the distribution load value at each time the distribution load changes is obtained from the distribution load records of the maintenance area, and then all the distribution load values ​​are clustered using a clustering algorithm to obtain cluster clusters for multiple collection time periods. , so that the collection time period corresponding to each cluster can be used as a time node. For each time node, the mean of all distribution load values ​​corresponding to the time node can be used as the load mean of the maintenance area at the time node. The load mean of the maintenance area at different time nodes can be obtained by the above method; finally, the load fluctuation entropy of the maintenance area distribution is determined by all load means, and then the load fluctuation entropy of the power distribution of each maintenance area in the transmission and distribution network can be obtained by the following method, namely: using the information entropy algorithm to calculate the information entropy of all load means as the load fluctuation entropy of the power distribution of the maintenance area. The load fluctuation entropy of the power distribution of each maintenance area in the transmission and distribution network can be obtained by the above method.

[0075] It should be noted that in this application, load fluctuation entropy represents the uncertainty of load fluctuation in the time series dimension; distribution load record represents the recorded data of distribution load in each maintenance area of ​​the distribution system within a specified time period; load mean is a parameter used to measure the normal load level in the transmission and distribution network.

[0076] In some embodiments, the following steps may be used to determine the load safety constraints of the power transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of the power distribution in each maintenance area and the load distribution characteristics of the power transmission and distribution network in the power transmission and distribution system:

[0077] Obtain load distribution characteristics of the transmission and distribution network from the transmission and distribution system;

[0078] For each maintenance area, extracting the constraints of the power distribution load in the maintenance area from the load distribution characteristics;

[0079] The load safety constraints during power distribution in the maintenance area are determined by the constraint conditions and the load fluctuation entropy of power distribution in the maintenance area, thereby obtaining the load safety constraints during power distribution in each maintenance area by the transmission and distribution network.

[0080] In specific implementation, first, the load distribution characteristics of the transmission and distribution network are obtained from the transmission and distribution system, which can be achieved in the following way, namely: the real-time load data of each maintenance area in the transmission and distribution network is obtained through the power monitoring system (such as SCADA), including the current, voltage and power parameters of each power node, and the distribution law of the load demand in the spatial dimension of the real-time load data is extracted using statistical methods, so that the collection of the distribution laws of all load demands is used as the load distribution characteristics of the transmission and distribution network, wherein the distribution law includes the maximum load carrying capacity, voltage stability and load fluctuation rate limit; then, for each maintenance area, the constraint conditions of the distribution load in the maintenance area are extracted from the load distribution characteristics, which can be achieved in the following way, namely: the distribution law of the load demand in the maintenance area in the load distribution characteristics can be used as the constraint conditions of the distribution load in the maintenance area; finally, the constraint conditions and the load fluctuation rate of the distribution in the maintenance area are used to obtain the load distribution characteristics of the transmission and distribution network. Dynamic entropy is used to determine the load safety constraints during power distribution in the maintenance area, and then the load safety constraints of the transmission and distribution network during power distribution to each maintenance area can be obtained by the following method: initialize a constraint reasoning model based on fuzzy logic, use the constraint conditions as the fuzzy logic constraint conditions in the constraint reasoning model, and use the load fluctuation entropy of the maintenance area power distribution as the input variable of the load characteristics in the constraint reasoning model, thereby constructing a fuzzy rule base for the safety constraints in the constraint reasoning model. For example: if the load fluctuation entropy is large and the load constraint conditions are strict, then the load safety constraint is strong; if the load fluctuation entropy is small and the load constraint conditions are loose, then the load safety constraint is weak, thereby using the constraint reasoning model to perform fuzzy reasoning on the constraint conditions of the load adjustment process, and thus the result of the fuzzy reasoning of the constraint reasoning model is used as the load safety constraints during power distribution in the maintenance area. Through the above method, the load safety constraints of the transmission and distribution network during power distribution to each maintenance area can be obtained.

[0081] It should be noted that in this application, load safety constraints refer to the safety constraints of the transmission and distribution network during the distribution load scheduling process; load distribution characteristics represent the distribution pattern of loads in different areas of the distribution network; distribution load constraints represent the constraints in the distribution load scheduling process in the transmission and distribution network; constraint reasoning model.

[0082] In step 104, the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system is determined based on the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then a safety protection warning is issued to each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence.

[0083] In some embodiments, the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system is determined by the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, referring to Figure 3 As described above, this figure is a schematic diagram of the process of determining the security confidence level in some embodiments of the present application. In this embodiment, the security confidence level can be determined by the following steps:

[0084] In step 1041, for each maintenance area in the transmission and distribution network, the load transfer characteristics and load security constraints of the maintenance area are fused into a load fusion constraint of the maintenance area;

[0085] In step 1042, the load fusion constraint is used to perform confidence constraints on the current load state of the maintenance area to obtain the safety confidence of the maintenance area in the maintenance of the power transmission and distribution system, and then obtain the safety confidence of each maintenance area in the power transmission and distribution network in the maintenance of the power transmission and distribution system.

[0086] In a specific implementation, first, for each maintenance area in the transmission and distribution network, the load transfer characteristics and load safety constraints of the maintenance area are fused into the load fusion constraints of the maintenance area. This can be achieved in the following manner: for each maintenance area in the transmission and distribution network, a feature fusion algorithm (for example, a principal component analysis algorithm) can be used to fuse the load transfer characteristics and load safety constraints of the maintenance area, and the result of the feature fusion is used as the load fusion constraint of the maintenance area; then, the load fusion constraint is used to perform a confidence constraint on the current load state of the maintenance area to obtain the safety confidence of the maintenance area in the maintenance of the transmission and distribution system, and then the safety confidence of each maintenance area in the transmission and distribution network in the maintenance of the transmission and distribution system is obtained. This can be achieved in the following manner: the cosine similarity between the load fusion constraint and the current load state of the maintenance area is used as the state matching degree between the load fusion constraint and the current load state of the maintenance area, and the state matching process can be used as the confidence constraint process, that is, the state matching degree can be used as the safety confidence of the maintenance area in the maintenance of the transmission and distribution system. The safety confidence of each maintenance area in the transmission and distribution network in the maintenance of the transmission and distribution system can be obtained by the above method.

[0087] It should be noted that, in this application, safety confidence refers to the degree of confidence that the transmission and distribution system meets safe operating conditions; load fusion constraints refer to constraints used to evaluate the confidence of load scheduling decisions.

[0088] In some embodiments, the following steps may be used to provide a safety warning for each maintenance area during maintenance of the power transmission and distribution system based on each safety confidence level:

[0089] Obtaining load safety thresholds for transmission and distribution system maintenance;

[0090] The maintenance area corresponding to the safety confidence level below the load safety threshold is used as the warning area for safety protection warning.

[0091] In specific implementation, first, obtaining the load safety threshold in the maintenance of the transmission and distribution system can be achieved in the following manner, namely: the load safety threshold in the maintenance of the transmission and distribution system can be obtained from the control console in the maintenance of the transmission and distribution system, wherein the load safety threshold represents the load limit of the transmission and distribution system to ensure stable operation of the power grid and not exceed the maximum safe carrying capacity during load scheduling; then, the maintenance area corresponding to the safety confidence level lower than the load safety threshold is used as an early warning area for safety protection early warning, which can be achieved in the following manner, namely: for each maintenance area, if the safety confidence level of the maintenance area in the maintenance of the transmission and distribution system is lower than the load safety threshold, then the maintenance area is used as an early warning area for safety protection early warning; if the safety confidence level of the maintenance area in the maintenance of the transmission and distribution system is greater than or equal to the load safety threshold, then the maintenance area is used as a normal load area. The above method can obtain safety protection early warnings for each maintenance area.

[0092] In addition, in another aspect of the present application, in some embodiments, the present application provides a safety protection system for power transmission and distribution system maintenance, the safety protection system for power transmission and distribution system maintenance includes a safety early warning unit, reference Figure 4 , which is a schematic diagram of the structure of a security warning unit according to some embodiments of the present application. The security warning unit includes: a monitoring module 201, a processing module 202 and an execution module 203, which are described as follows:

[0093] Monitoring module 201, in this application, monitoring module 201 is mainly used to monitor the transmission load of each transmission line in the transmission and distribution network when the transmission and distribution system transmits and distributes power to each maintenance area in the transmission and distribution network;

[0094] Processing module 202, in this application, is used to determine the line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network, and determine the load transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads;

[0095] It should be noted that the processing module 202 is further configured to determine the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network, and determine the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the power transmission and distribution system;

[0096] Execution module 203. In this application, execution module 203 is mainly used to determine the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system through the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then provide safety protection warnings for each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence.

[0097] The above describes in detail an example of a safety protection system and method for maintenance of a power transmission and distribution system provided by an embodiment of the present application. It can be understood that, in order to implement the above functions, the corresponding device includes a hardware structure and / or software module corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0098] In some embodiments, the present application also provides a computer device, which includes a memory and a processor, the memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that the computer device executes the above-mentioned safety warning method for power transmission and distribution system maintenance.

[0099] In some embodiments, reference Figure 5 , the dotted line in the figure indicates that the unit or module is optional. The figure is a structural diagram of a computer device for implementing a safety warning method for power transmission and distribution system maintenance according to an embodiment of the present application. The safety warning method for power transmission and distribution system maintenance described in the above embodiment can be Figure 5 The computer device shown in the figure is implemented, and the computer device includes at least one processor 301, a memory 302 and at least one communication unit 305. The computer device can be a terminal device, a server or a chip.

[0100] The processor 301 may be a general-purpose processor or a dedicated processor. For example, the processor 301 may be a central processing unit (CPU), which may be used to control the computer device, execute software programs, and process data from the software programs. The computer device may also include a communication unit 305 for inputting (receiving) and outputting (transmitting) signals.

[0101] For example, the computer device may be a chip, the communication unit 305 may be an input and / or output circuit of the chip, or the communication unit 305 may be a communication interface of the chip, and the chip may be a component of a terminal device, a network device, or other device.

[0102] For another example, the computer device may be a terminal device or a server, and the communication unit 305 may be a transceiver of the terminal device or the server, or the communication unit 305 may be a transceiver circuit of the terminal device or the server.

[0103] The computer device may include one or more memories 302, on which a program 304 is stored. The program 304 can be executed by the processor 301 to generate instructions 303, so that the processor 301 executes the method described in the above method embodiment according to the instructions 303. Optionally, data (such as a target audit model) can also be stored in the memory 302. Optionally, the processor 301 can also read data stored in the memory 302. The data can be stored at the same storage address as the program 304, or at a different storage address from the program 304.

[0104] The processor 301 and the memory 302 may be provided separately or integrated together, for example, integrated on a system on chip (SOC) of a terminal device.

[0105] It should be understood that each step of the above method embodiment can be completed by a hardware-based logic circuit or software-based instructions in the processor 301. The processor 301 can be a CPU, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, such as discrete gates, transistor logic devices, or discrete hardware components.

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] For example, in some embodiments, the present application also provides a computer-readable storage medium, which stores instructions or codes. When the instructions or codes are run on a computer, the computer implements the above-mentioned safety warning method for power transmission and distribution system maintenance.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0109] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A safety early warning method for power transmission and distribution system maintenance, characterized in that: The steps include: When the power transmission and distribution system transmits and distributes power to various maintenance areas in the power transmission and distribution network, it monitors the power transmission load of each transmission line in the power transmission and distribution network; Determine the line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network, and determine the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads; Determine the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network, and determine the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the transmission and distribution system; Determining the safety confidence level of each maintenance area in the transmission and distribution network during power transmission and distribution system maintenance based on the transfer characteristics of the transmission load in each maintenance area and the load safety constraints of the transmission and distribution network when distributing power to each maintenance area, and then providing safety protection warnings for each maintenance area during power transmission and distribution system maintenance based on each safety confidence level; The load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network are determined based on the line redundancy of each maintenance area and all transmission loads, specifically including: For each maintenance area, the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission dispatching in the maintenance area are extracted from the line redundancy of the maintenance area; Determine the load transfer capacity of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area through each scheduling redundancy feature and all transmission loads; Determine the load transfer characteristics of the maintenance area to the transmission load in the transmission and distribution network based on all load transfer capacities, and then obtain the load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network; The method of determining the safety confidence of each maintenance area in the transmission and distribution network during transmission and distribution system maintenance based on the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints of the transmission and distribution network when distributing power to each maintenance area specifically includes: For each maintenance area in the transmission and distribution network, the load transfer characteristics and load security constraints of the maintenance area are integrated into the load fusion constraints of the maintenance area; The load fusion constraint is used to perform confidence constraints on the current load state of the maintenance area, and the safety confidence of the maintenance area in the maintenance of the power transmission and distribution system is obtained, and then the safety confidence of each maintenance area in the power transmission and distribution network in the maintenance of the power transmission and distribution system is obtained.

2. The method according to claim 1, wherein The line redundancy of each maintenance area in the transmission and distribution network in the transmission scheduling is determined by the grid topology structure of the transmission lines in the transmission and distribution network, specifically including: Obtaining the grid topology of transmission lines in the transmission and distribution network; For each maintenance area in the transmission and distribution network, quantifying the dispatching possibility of each transmission line when the transmission and distribution network performs power transmission dispatching on the maintenance area through the grid topology structure; The line redundancy of the maintenance area in the transmission scheduling is determined through all scheduling possibilities, and then the line redundancy of each maintenance area in the transmission scheduling in the transmission and distribution network is obtained.

3. The method according to claim 1, wherein Determining the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network specifically includes: Obtain distribution load records for each maintenance area in the transmission and distribution network; For each maintenance area in the transmission and distribution network, the load average of the maintenance area at different time nodes is extracted from the distribution load records of the maintenance area; The load fluctuation entropy of the power distribution in the maintenance area is determined by the mean value of all loads, and then the load fluctuation entropy of the power distribution in each maintenance area in the transmission and distribution network is obtained.

4. The method according to claim 1, wherein Based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the transmission and distribution system, the load security constraints of the transmission and distribution network when distributing power to each maintenance area are determined, including: Obtain load distribution characteristics of the transmission and distribution network from the transmission and distribution system; For each maintenance area, extracting the constraints of the power distribution load in the maintenance area from the load distribution characteristics; The load safety constraints during power distribution in the maintenance area are determined by the constraint conditions and the load fluctuation entropy of power distribution in the maintenance area, thereby obtaining the load safety constraints during power distribution in each maintenance area by the transmission and distribution network.

5. The method according to claim 1, wherein Based on various safety confidence levels, safety protection warnings are provided for each maintenance area in the power transmission and distribution system maintenance, specifically including: Obtaining load safety thresholds for transmission and distribution system maintenance; The maintenance area corresponding to the safety confidence level below the load safety threshold is used as the warning area for safety protection warning.

6. A safety protection system for power transmission and distribution system maintenance, the safety protection system for power transmission and distribution system maintenance comprising a safety warning unit, which uses the method according to any one of claims 1 to 5 for safety warning, characterized in that: The safety warning unit includes: A monitoring module, configured to monitor the transmission load of each transmission line in the transmission and distribution network when the transmission and distribution system transmits and distributes power to each maintenance area in the transmission and distribution network; a processing module, configured to determine line redundancy of each maintenance area in the transmission and distribution network in transmission scheduling based on the grid topology of the transmission lines in the transmission and distribution network, and determine load transfer characteristics of each maintenance area to the transmission load in the transmission and distribution network based on the line redundancy of each maintenance area and all transmission loads; The processing module is further configured to determine the load fluctuation entropy of power distribution in each maintenance area in the transmission and distribution network, and determine the load safety constraints of the transmission and distribution network when distributing power to each maintenance area based on the load fluctuation entropy of power distribution in each maintenance area and the load distribution characteristics of the transmission and distribution network in the power transmission and distribution system; An execution module is used to determine the safety confidence level of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system through the transfer characteristics of the transmission load in the transmission and distribution network by each maintenance area and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then to provide safety protection warnings for each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence level.

7. A computer device, characterized in that: The computer device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the computer device executes the safety warning method for power transmission and distribution system maintenance described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores instructions or codes, which, when executed on a computer, enable the computer to implement the safety warning method for power transmission and distribution system maintenance according to any one of claims 1 to 5.

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