Safety protection system and method for power transmission and distribution system maintenance

Abstract

The invention provides a safety protection system and method for maintenance of a power transmission and distribution system. The method comprises the following steps: determining load transfer characteristics of each maintenance area to a power transmission load in a power transmission and distribution network through line redundancy of line redundancy of each maintenance area in power transmission scheduling in the power transmission and distribution network and all power transmission loads; determining a load fluctuation entropy of power distribution of each maintenance area in the power transmission and distribution network, and determining a load safety constraint of the power transmission and distribution network during power distribution of each maintenance area according to the load fluctuation entropy of power distribution of each maintenance area; and determining the security confidence of each maintenance area in the power transmission and distribution network during the maintenance of the power transmission and distribution system through each transfer feature and each load security constraint, and further performing security protection early warning on each maintenance area in the maintenance of the power transmission and distribution system based on each security confidence. Based on the scheme, confidence safety early warning in power transmission and distribution system maintenance can be realized.

Description

Technical Field

[0001] This application relates to the technical field of power transmission and distribution safety, and more specifically, to a safety protection system and method for power transmission and distribution system maintenance. Background Art

[0002] With the continuous increase in global electricity demand, especially in the process of industrialization and urbanization, the grid load has been continuously climbing, posing higher requirements for the reliability and safety of the power 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 have increased, also bringing challenges to the stability of the power transmission and distribution network.

[0003] Traditional safety warning methods for power transmission and distribution systems usually regard the power distribution and transmission systems as relatively independent modules, lacking a comprehensive assessment of the synergistic effects between the two, and failing to effectively consider the interaction and mutual influence between the two. For example, the load fluctuation of the distribution network may affect the load flow of the transmission line, and the state change of the transmission line may also have a feedback effect on the downstream distribution system. However, traditional methods cannot capture this two-way interaction relationship, resulting in great limitations in the actual application of the load dispatching and risk warning models. This limitation makes the traditional warning mechanism often unable to accurately and comprehensively reflect the load changes and their potential risks in each region of the power grid. Especially in the case of complex load distribution and frequent load fluctuations in the power grid, the warning effect is relatively slow or inaccurate. Therefore, how to achieve confidence safety warning in power transmission and distribution system maintenance is a difficult problem faced by the industry. Summary of the Invention

[0004] This application provides a safety protection system and method for power transmission and distribution system maintenance, which can achieve confidence safety warning in power transmission and distribution system maintenance.

[0005] In a first aspect, this application provides a safety warning method for power transmission and distribution system maintenance, including:

[0006] When the power transmission and distribution system conducts power transmission and distribution for each maintenance area in the power transmission and distribution network, monitor the transmission load of each transmission line in the power transmission and distribution network;

[0007] Determine the line redundancy of each maintenance area in the power transmission and distribution network during transmission scheduling through the grid topology structure of the transmission lines in the power transmission and distribution network, and determine the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network according to the line redundancy of each maintenance area and all the transmission loads;

[0008] Determine the load fluctuation entropy of the power distribution of each maintenance area in the power transmission and distribution network, and determine the load safety constraint when the power transmission and distribution network conducts power distribution for each maintenance area according to the load fluctuation entropy of the power distribution of each maintenance area and the load distribution characteristics of the power transmission and distribution network in the power transmission and distribution system;

[0009] Determine the safety confidence of each maintenance area in the transmission and distribution network during the maintenance of the transmission and distribution system based on the transfer characteristics of the transmission load in the transmission and distribution network and the load safety constraints when the transmission and distribution network distributes power to each maintenance area, and then perform safety protection warnings for each maintenance area in the maintenance of the transmission and distribution system based on each safety confidence.

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

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

[0012] For each maintenance area in the transmission and distribution network, quantify the scheduling possibility of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area through the electric network topology;

[0013] Determine the line redundancy of the maintenance area in the transmission scheduling through all the scheduling possibilities, and then obtain the line redundancy of each maintenance area in the transmission and distribution network during the transmission scheduling.

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

[0015] For each maintenance area, extract the scheduling redundancy characteristics of each transmission line when the transmission and distribution network performs transmission scheduling for the maintenance area 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 characteristic and all the transmission loads;

[0017] Determine the load transfer characteristics of the maintenance area for the transmission load in the transmission and distribution network according to all the load transfer capacities, and then obtain the load transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network.

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

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

[0020] For each maintenance area in the transmission and distribution network, extract the load mean value of the maintenance area at different time nodes from the power distribution load records of the maintenance area;

[0021] Determine the load fluctuation entropy of power distribution of the maintenance area through all the load mean values, and then obtain the load fluctuation entropy of power distribution of each maintenance area in the transmission and distribution network.

[0022] In some embodiments, determining the load safety constraints when the power transmission and distribution network distributes power to each maintenance area according to the load fluctuation entropy of 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 the load distribution characteristics of the power transmission and distribution network from the power transmission and distribution system;

[0024] For each maintenance area, extract the constraint conditions of the power distribution load in the maintenance area from the load distribution characteristics;

[0025] Determine the load safety constraints when distributing power to the maintenance area through the constraint conditions and the load fluctuation entropy of power distribution in the maintenance area, and then obtain the load safety constraints when the power transmission and distribution network distributes power to each maintenance area.

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

[0027] For each maintenance area in the power transmission and distribution network, fuse the load transfer characteristics and load safety constraints of the maintenance area into the load fusion constraints of the maintenance area;

[0028] Use the load fusion constraints to perform confidence constraints on the current load state of the maintenance area to obtain the safety confidence level of the maintenance area during the maintenance of the power transmission and distribution system, and then obtain the safety confidence level of each maintenance area in the power transmission and distribution system during the maintenance of the power transmission and distribution system.

[0029] In some embodiments, performing safety protection warnings on each maintenance area during the maintenance of the power transmission and distribution system based on each safety confidence level specifically includes:

[0030] Obtain the load safety threshold during the maintenance of the power transmission and distribution system;

[0031] Use the maintenance area corresponding to the safety confidence level lower than the load safety threshold as the warning area for safety protection warnings.

[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, and the safety warning unit includes:

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

[0034] A processing module, configured to determine the line redundancy of each maintenance area in the transmission and distribution network during transmission dispatching according to 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 according to the line redundancy of each maintenance area and all the transmission loads;

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

[0036] An execution module, configured to determine the safety confidence level of each maintenance area in the transmission and distribution system during the maintenance of the transmission and distribution system according to the transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network and the load safety constraint when the transmission and distribution network distributes power to each maintenance area, and then perform a safety protection warning on 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, which 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 above-mentioned safety warning method for the maintenance of the transmission and distribution system.

[0038] In a fourth aspect, the present application provides a computer-readable storage medium, in which instructions or codes are stored. When the instructions or codes are run on a computer, the computer is caused to execute the above-mentioned safety warning method for the maintenance of the transmission and distribution system.

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

[0040] In a safety protection system and method for the maintenance of a power transmission and distribution system provided by this application, when the power transmission and distribution system conducts power transmission and distribution for each maintenance area in the power transmission and distribution network, the transmission load of each transmission line in the power transmission and distribution network is monitored; the line redundancy of each maintenance area in the power transmission and distribution scheduling is determined through the grid topology structure of the transmission lines in the power transmission and distribution network, and the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network are determined according to the line redundancy of each maintenance area and all the transmission loads; the load fluctuation entropy of the power distribution of each maintenance area in the power transmission and distribution network is determined, and the load safety constraint for the power distribution of each maintenance area by the power transmission and distribution network is determined based on the load fluctuation entropy of the power distribution of each maintenance area and the load distribution characteristics of the power transmission and distribution network in the power transmission and distribution system; the safety confidence level of each maintenance area in the power transmission and distribution system during maintenance is determined through the transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network and the load safety constraint for the power distribution of each maintenance area by the power transmission and distribution network, and then safety protection warnings are given to each maintenance area in the maintenance of the power transmission and distribution system based on each safety confidence level.

[0041] Thus, in this application, the safety confidence level of each maintenance area in the power transmission and distribution system during maintenance is determined through the transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network and the load safety constraint for the power distribution of each maintenance area by the power transmission and distribution network, and then safety protection warnings are given to each maintenance area in the maintenance of the power transmission and distribution system based on each safety confidence level. First of all, 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 power transmission and distribution system. Especially when some lines or areas are overloaded or overloaded, by integrating the load transfer characteristics, the power transmission and distribution system can more accurately predict the load distribution and change trend, thereby improving the accuracy and timeliness of early warning. When the load transfer characteristics are combined with the safety confidence level, it can monitor and evaluate the load changes in different areas in real time, so as to ensure that the power grid can be dynamically adjusted during the peak load period and reduce the risk of power outages or system collapses. Then, by reasonably setting the load safety constraint, a clear load limit can be provided for the power transmission and distribution system to avoid power equipment damage or power outages caused by load overlimit. Among them, 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 power transmission and distribution system can quickly adjust and recover during load fluctuations. After integrating the safety constraint with the load transfer characteristics, a more accurate safety warning mechanism can be provided to monitor the power grid load status in real time and give early warnings in time when the power transmission and distribution system is facing overload or unstable conditions, avoiding accidents and ensuring the reliability and safety of the power grid operation. To sum up, confidence safety early warning in the maintenance of the power transmission and distribution system can be realized based on the above scheme. Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

[0045] Figure 3 is a schematic flowchart for determining safety confidence shown according to some embodiments of the present application;

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

[0047] Figure 5 is a schematic structural diagram of a computer device for implementing a safety warning method for power transmission and distribution system maintenance shown according to some embodiments of the present application. Detailed implementation manners

[0048] To better understand the technical solutions of the present application, the following will describe the technical solutions of the present application in detail in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0049] Refer to Figure 1 , which is an exemplary flowchart of a safety warning method for power transmission and distribution system maintenance shown 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 performs power transmission and distribution on each maintenance area in the power transmission and distribution network, monitor the transmission load of each transmission line in the power transmission and distribution network.

[0051] In specific implementation, when the power transmission and distribution system performs power transmission and distribution on each maintenance area in the power transmission and distribution network, use a current sensor to monitor the transmission current of each transmission line in the power transmission and distribution network at the current moment, and this 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 electrical 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 power transmission and distribution from the power plant to the end users; the transmission line refers to the power transmission line connecting the power generation and the distribution network, which is used to transmit electrical energy from the power source to each distribution area; the maintenance area is the grid area for regular inspection, repair and maintenance.

[0053] In some embodiments, referring to Figure 2 as described, this figure is the transmission flow chart of the transmission and distribution system shown in some embodiments of this application. This figure shows the process of power transmission from the power plant to the users. First, the generator in the power plant generates electricity with a voltage of 6.3 - 20 kV, and then the voltage is increased to 220 - 500 kV through a step-up transformer for long-distance transmission through high-voltage transmission lines; during the power transmission process, it will pass through the regional substation, where the voltage is reduced to 35 - 110 kV through a step-down transformer, and then distributed through high-voltage distribution lines; then, the power passes through a step-down transformer again to reduce the voltage to 6 - 10 kV, and is further distributed to a wider area through high-voltage distribution lines.

[0054] In the last step close to the users, the power passes through a step-down transformer to reduce the voltage to 0.38 / 0.22 kV, which is the low-voltage distribution line, and finally safely delivers the power to the user end; throughout the process, the transformer plays a key role in the voltage increase and decrease, while the transmission lines and distribution lines are responsible for the power transmission and distribution; this hierarchical voltage regulation and transmission method ensures the efficiency and safety of power during long-distance transmission, and also meets the voltage level requirements of different users.

[0055] This figure details all the links of power transmission, from the power plant to the 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 - 20 kV at the power plant, to 220 - 500 kV after step-up, to 35 - 110 kV at the regional substation, and finally 0.38 / 0.22 kV at the user end; it not only optimizes the efficiency of power transmission, but also ensures the stability and safety of power supply. Through the process in this figure, power can be efficiently and safely transmitted from the power plant to the final users, meeting the power consumption needs of different scales and types.

[0056] In step 102, determine the line redundancy of each maintenance area in the transmission and distribution network during transmission scheduling through 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 according to the line redundancy of each maintenance area and all the transmission loads.

[0057] In some embodiments, the line redundancy of each maintenance area in the transmission and distribution network during transmission scheduling can be determined through the grid topology of the transmission lines in the transmission and distribution network, which can be achieved by the following steps:

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

[0059] For each maintenance area in the transmission and distribution network, quantify the scheduling possibility of each transmission line when the transmission and distribution network conducts transmission scheduling for the maintenance area through the electrical network topology;

[0060] Determine the line redundancy of the maintenance area in transmission scheduling through all the scheduling possibilities, and then obtain the line redundancy of each maintenance area in the transmission and distribution network during transmission scheduling.

[0061] When specifically implemented, first, obtaining the grid topology of the transmission lines in the transmission and distribution network can be achieved in the following manner, that is: the grid topology of the transmission lines in the transmission and distribution network can be obtained from the console of the transmission and distribution system; then, for each maintenance area in the transmission and distribution network, quantifying the scheduling possibility of each transmission line when the transmission and distribution network conducts transmission scheduling for the maintenance area through the electrical network topology can be achieved in the following manner, that is: for each maintenance area in the transmission and distribution network, use a path planning algorithm to plan the transmission scheduling lines of the maintenance area in the grid topology, so as to obtain multiple scheduling lines, and obtain the usage probability of each scheduling line from the planning results, count the usage times of each transmission line from the multiple scheduling lines, and for each transmission line, the result of multiplying the usage times of the transmission line by the usage probability of the corresponding scheduling line of the transmission line and then dividing by the sum of all usage times can be used as the scheduling possibility of the transmission line. Through the above method, the scheduling possibility of each transmission line when the transmission and distribution network conducts transmission scheduling for the maintenance area can be obtained; finally, determining the line redundancy of the maintenance area in transmission scheduling through all the scheduling possibilities, and then obtaining the line redundancy of each maintenance area in the transmission and distribution network during transmission scheduling can be achieved in the following manner, that is: the difference between the sum of all scheduling possibilities and 1 can be used as the line redundancy of the maintenance area in transmission scheduling. Through the above method, the line redundancy of each maintenance area in the transmission and distribution network during transmission scheduling can be obtained.

[0062] It should be noted that in this application, the line redundancy represents the redundancy degree of the alternative sharing lines that the maintenance area can choose during transmission scheduling. The higher the redundancy, it means that when a transmission line fails in the maintenance area, more transmission lines can be used to share the load, thereby ensuring the stable operation of the power grid; the network topology refers to the spatial connection relationship of each transmission line in the transmission and distribution network; the scheduling possibility represents the usage probability of each transmission line when the maintenance area conducts transmission scheduling.

[0063] In some embodiments, the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network can be determined according to the line redundancy of each maintenance area and all transmission loads by the following steps:

[0064] For each maintenance area, extract the scheduling redundancy characteristics of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area from the line redundancy of the maintenance area;

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

[0066] Determine the load transfer characteristics of the maintenance area for the transmission load in the power transmission and distribution network according to all the load transfer capacities, and then obtain the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network.

[0067] Specifically, when implemented, first, for each maintenance area, the extraction of the scheduling redundancy characteristics of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area from the line redundancy of the maintenance area can be implemented in the following manner, that is: for each maintenance area, the ratio of the scheduling possibility of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area to the line redundancy can be used as the scheduling redundancy characteristic of the corresponding transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area, and thus the scheduling redundancy characteristics of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area can be obtained; then, the determination of the load transfer capacity of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area through each scheduling redundancy characteristic and all transmission loads can be implemented in the following manner, that is: for each transmission line, construct a multivariable regression model, combine the scheduling redundancy characteristic of the transmission line and the transmission load, and calculate the load transfer capacity of the transmission line, that is, load transfer capacity = a * scheduling redundancy characteristic + b * transmission load + c, where a, b, and c are the parameters of the multivariable regression model and are obtained by training with historical operation data. Through the above method, the load transfer capacity of each transmission line when the power transmission and distribution network conducts power transmission scheduling for the maintenance area can be obtained; finally, the determination of the load transfer characteristics of the maintenance area for the transmission load in the power transmission and distribution network according to all the load transfer capacities, and then the obtaining of the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network can be implemented in the following manner, that is: use the set of all load transfer capacities as the load transfer characteristics of the maintenance area for the transmission load in the power transmission and distribution network. Through the above method, the load transfer characteristics of each maintenance area for the transmission load in the power transmission and distribution network can be obtained.

[0068] It should be noted that in this application, the load transfer feature represents the characteristic of the transmission load transferring between different transmission lines, and this load transfer feature reflects the flexibility of the system's load regulation under different dispatching conditions; the dispatching redundancy feature represents the standby load that the transmission and distribution network can accommodate under different dispatching schemes; the load transfer capacity is a quantitative value reflecting the relationship between load dispatching and transmission capacity.

[0069] In step 103, determine the load fluctuation entropy of the power distribution in each maintenance area of the transmission and distribution network, and determine the load safety constraints for the power distribution in each maintenance area of the transmission and distribution network according to the load fluctuation entropy of the 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, the determination of the load fluctuation entropy of the power distribution in each maintenance area of the transmission and distribution network can be achieved by the following steps:

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

[0072] For each maintenance area in the transmission and distribution network, extract the load mean value of the maintenance area at different time nodes from the power distribution load records of the maintenance area;

[0073] Determine the load fluctuation entropy of the power distribution in the maintenance area through all the load mean values, and then obtain the load fluctuation entropy of the power distribution in each maintenance area of the transmission and distribution network.

[0074] Specifically, when implemented, first, the obtaining of the power distribution load records of each maintenance area in the transmission and distribution network can be achieved in the following way, that is: the power 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 extraction of the load mean value of the maintenance area at different time nodes from the power distribution load records of the maintenance area can be achieved in the following way, that is: for each maintenance area in the transmission and distribution network, obtain the power distribution load value at each time of power distribution load change from the power distribution load records of the maintenance area, and then use the clustering algorithm to cluster all the power distribution load values to obtain multiple clustering clusters for the acquisition time periods, so that the acquisition time periods corresponding to each clustering cluster can be used as time nodes, and for each time node, the mean value of all the power distribution load values corresponding to the time node can be used as the load mean value of the maintenance area at the time node, and through the above method, the load mean values of the maintenance area at different time nodes can be obtained; finally, the determination of the load fluctuation entropy of the power distribution in the maintenance area through all the load mean values, and then the obtaining of the load fluctuation entropy of the power distribution in each maintenance area of the transmission and distribution network can be achieved in the following way, that is: use the information entropy algorithm to calculate the information entropy of all the load mean values as the load fluctuation entropy of the power distribution in the maintenance area, and through the above method, the load fluctuation entropy of the power distribution in each maintenance area of the transmission and distribution network can be obtained.

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

[0076] In some embodiments, the load safety constraints for power distribution in each maintenance area by the transmission and distribution network can be implemented by the following steps according to 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:

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

[0078] For each maintenance area, extract the constraint conditions of the distribution load in the maintenance area from the load distribution characteristics;

[0079] Determine the load safety constraints for power distribution in the maintenance area through the constraint conditions and the load fluctuation entropy of power distribution in the maintenance area, and then obtain the load safety constraints for power distribution in each maintenance area by the transmission and distribution network.

[0080] In specific implementation, first, the load distribution characteristics of the power transmission and distribution network can be obtained from the power transmission and distribution system in the following way: obtain the real-time load data of each maintenance area in the power transmission and distribution network through a power monitoring system (such as SCADA), including the current, voltage, and power parameters of each power node, and use statistical methods to extract the distribution law of the load demand in the spatial dimension from the real-time load data, so as to take the set of the distribution laws of all load demands as the load distribution characteristics of the power transmission and distribution network. Among them, the distribution law includes the maximum load-carrying capacity, voltage stability, and load volatility limit. Then, for each maintenance area, the following method can be used to extract the constraint conditions of the distribution load in the maintenance area from the load distribution characteristics: 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 load safety constraint during the distribution of the maintenance area can be determined through the constraint conditions and the load fluctuation entropy of the distribution of the maintenance area, and then the load safety constraint of the power transmission and distribution network for the distribution of each maintenance area can be obtained in the following way: initialize a constraint reasoning model based on fuzzy logic, take the constraint conditions as the fuzzy logic constraint conditions in the constraint reasoning model, and take the load fluctuation entropy of the distribution of the maintenance area as the input variable of the load characteristics in the constraint reasoning model, so as to construct a fuzzy rule base for the safety constraint in the constraint reasoning model. For example: if the load fluctuation entropy is very large and the load constraint conditions are relatively strict, the load safety constraint is strong; if the load fluctuation entropy is small and the load constraint conditions are loose, the load safety constraint is weak. Then, use the constraint reasoning model to perform fuzzy reasoning on the constraint conditions in the load adjustment process, and take the result of the fuzzy reasoning of the constraint reasoning model as the load safety constraint during the distribution of the maintenance area. Through the above method, the load safety constraint of the power transmission and distribution network for the distribution of each maintenance area can be obtained.

[0081] It should be noted that in this application, the load safety constraint refers to the safety limit conditions during the distribution load scheduling process of the power transmission and distribution network; the load distribution characteristics represent the distribution law of the load in different areas of the distribution network; the constraint conditions of the distribution load represent the limit conditions during the distribution load scheduling process of the power transmission and distribution network; the constraint reasoning model.

[0082] In step 104, the safety confidence level of each maintenance area in the power transmission and distribution system during the maintenance of the power transmission and distribution system is determined through the transfer characteristics of the transmission load in the power transmission and distribution network by each maintenance area and the load safety constraint of the power transmission and distribution network for the distribution of each maintenance area, and then safety protection warnings are given to each maintenance area in the maintenance of the power transmission and distribution system based on each safety confidence level.

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

[0084] In step 1041, for each maintenance area in the power 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;

[0085] In step 1042, the current load state of the maintenance area is confidence-constrained using the load fusion constraints to obtain the safety confidence level of the maintenance area during the maintenance of the power transmission and distribution system, and then the safety confidence levels of each maintenance area in the power transmission and distribution network during the maintenance of the power transmission and distribution system are obtained.

[0086] Specifically, first, for each maintenance area in the power transmission and distribution network, fusing the load transfer characteristics and load safety constraints of the maintenance area into the load fusion constraints of the maintenance area can be achieved in the following way, that is: for each maintenance area in the power transmission and distribution network, a feature fusion algorithm (such as: 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 constraints of the maintenance area; then, using the load fusion constraints to confidence-constrain the current load state of the maintenance area to obtain the safety confidence level of the maintenance area during the maintenance of the power transmission and distribution system, and then the safety confidence levels of each maintenance area in the power transmission and distribution network during the maintenance of the power transmission and distribution system can be achieved in the following way, that is: the cosine similarity between the load fusion constraints and the current load state of the maintenance area is used as the degree of state matching between the load fusion constraints and the current load state of the maintenance area, and this process of state matching can be used as the process of confidence constraint, that is, this degree of state matching can be used as the safety confidence level of the maintenance area during the maintenance of the power transmission and distribution system. Through the above method, the safety confidence levels of each maintenance area in the power transmission and distribution network during the maintenance of the power transmission and distribution system can be obtained.

[0087] It should be noted that in the present application, the safety confidence level represents the degree of credibility that the power transmission and distribution system meets the safe operation conditions; the load fusion constraints represent the constraint conditions for evaluating the credibility of the load dispatching decision.

[0088] In some embodiments, the safety protection warning for each maintenance area during the maintenance of the power transmission and distribution system based on each safety confidence level can be achieved by the following steps:

[0089] Obtain the load safety threshold during the maintenance of the power transmission and distribution system;

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

[0091] In specific implementation, first, the load safety threshold in the transmission and distribution system maintenance can be obtained in the following manner: the load safety threshold in the transmission and distribution system maintenance can be obtained from the console in the transmission and distribution system maintenance, where the load safety threshold represents the load limit for ensuring the stable operation of the power grid and not exceeding the maximum safety bearing capacity during the load dispatching process of the transmission and distribution system; then, the maintenance area corresponding to the safety confidence level lower than the load safety threshold can be used as the warning area for safety protection warning in the following manner: for each maintenance area, if the safety confidence level of the maintenance area in the transmission and distribution system maintenance is lower than the load safety threshold, then the maintenance area is used as the warning area for safety protection warning, and if the safety confidence level of the maintenance area in the transmission and distribution system maintenance is greater than or equal to the load safety threshold, then the maintenance area is used as the normal load area, and through the above method, the safety protection warning of each maintenance area can be obtained.

[0092] In addition, on the other hand of the present application, in some embodiments, the present application provides a safety protection system for transmission and distribution system maintenance, and the safety protection system for transmission and distribution system maintenance includes a safety warning unit. Refer to Figure 4 , this figure is a schematic structural diagram of the safety warning unit shown in some embodiments of the present application. The safety warning unit includes: a monitoring module 201, a processing module 202, and an execution module 203, which are described as follows:

[0093] The monitoring module 201, in the present application, the 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 conducts transmission and distribution for each maintenance area in the transmission and distribution network.

[0094] The processing module 202, in the present application, the processing module 202 is used to determine the line redundancy of each maintenance area in the transmission and distribution network during transmission dispatching through the grid topology structure 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 according to the line redundancy of each maintenance area and all the transmission loads.

[0095] It should be noted that the processing module 202 is also used to determine the load fluctuation entropy of the power distribution of each maintenance area in the transmission and distribution network, and determine the load safety constraint when the transmission and distribution network conducts power distribution for each maintenance area according to the load fluctuation entropy of the power distribution of each maintenance area and the load distribution characteristics of the transmission and distribution network in the transmission and distribution system.

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

[0097] The above has introduced in detail the examples of the safety protection system and method for transmission and distribution system maintenance provided by the embodiments of this application. It can be understood that, in order to implement the above functions, the corresponding device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed in this article, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians 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.

[0098] In some embodiments, this application also provides a computer device, which 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 above-mentioned safety warning method for transmission and distribution system maintenance.

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

[0100] The processor 301 can be a general-purpose processor or a special-purpose processor. For example, the processor 301 can be a central processing unit (CPU). The CPU can be used to control the computer device, execute software programs, and process the data of software programs. The computer device can also include a communication unit 305 for realizing the input (reception) and output (transmission) of signals.

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

[0102] As another example, the computer device may be a terminal device or a server, and the communication unit 305 may be the transceiver of the terminal device or the server. Alternatively, the communication unit 305 may be the 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 run by the processor 301 to generate instructions 303, so that the processor 301 executes the method described in the above method embodiments according to the instructions 303. Optionally, data (such as a target audit model) may also be stored in the memory 302. Optionally, the processor 301 may also read the data stored in the memory 302. The data may be stored at the same storage address as the program 304, or may be stored 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, they may be integrated on a system on chip (SOC) of a terminal device.

[0105] It should be understood that each step of the above method embodiments may be completed by a logic circuit in hardware form or an instruction in software form in the processor 301. The processor 301 may 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. For example, discrete gates, transistor logic devices, or discrete hardware components.

[0106] Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, 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 disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0107] For example, in some embodiments, the present application further provides a computer-readable storage medium storing instructions or code, which, when run on a computer, cause the computer to execute 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 can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0109] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also 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, monitor the 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 the transmission scheduling through the grid topology structure 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 according to the line redundancy of each maintenance area and all the 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; 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 safety protection warnings are issued to each maintenance area during the maintenance of the transmission and distribution system based on each safety confidence.

2. The method according to claim 1, characterized in that The line redundancy of each maintenance area in the transmission and distribution network in the transmission and distribution network is determined by the grid topology structure of the transmission lines in the transmission and distribution network, which specifically includes: Obtaining the grid topology of transmission lines in the transmission and distribution network; For each maintenance area in the transmission and distribution network, the dispatching possibility of each transmission line when the transmission and distribution network performs transmission dispatching for the maintenance area is quantified by the electric network 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 and distribution network in the transmission scheduling is obtained.

3. The method according to claim 1, characterized in that The load transfer characteristics of each maintenance area for the transmission load in the transmission and distribution network are determined based on the line redundancy of each maintenance area and all transmission loads, including: For each maintenance area, the dispatching redundancy characteristics of each transmission line when the transmission and distribution network performs transmission dispatching for 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 dispatching to the maintenance area through each dispatching redundancy feature and all transmission loads; 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.

4. The method according to claim 1, characterized in that 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.

5. The method according to claim 1, characterized in that According to 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, the load safety constraints of the transmission and distribution network when distributing power to each maintenance area are determined, including: Obtain the 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, and then the load safety constraints during power distribution of the transmission and distribution network to each maintenance area are obtained.

6. The method according to claim 1, characterized in that Determining 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 specifically includes: For each maintenance area in the transmission and distribution network, the load transfer characteristics and load safety 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 power transmission and distribution system maintenance is obtained, and then the safety confidence of each maintenance area in the power transmission and distribution network in the power transmission and distribution system maintenance is obtained.

7. The method according to claim 1, characterized in that Based on various safety confidence levels, safety protection warnings are carried out for each maintenance area in the power transmission and distribution system maintenance, including: Obtaining load safety thresholds in power 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.

8. 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 early warning unit, characterized in that: The safety early warning unit comprises: A monitoring module, 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; A processing module is used to determine the line redundancy of each maintenance area in the transmission and distribution network in the transmission scheduling through 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 according to the line redundancy of each maintenance area and all the transmission loads; The processing module is also used to determine the load fluctuation entropy of power distribution in each maintenance area in the power transmission and distribution network, and determine the load safety constraints of the power transmission and distribution network when distributing power to each maintenance area according to the load fluctuation entropy of 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; An execution module is 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.

9. 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 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or codes, and when the instructions or codes are executed on a computer, the computer implements the safety warning method for power transmission and distribution system maintenance as described in any one of claims 1 to 7.

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