CN114529166A

CN114529166A - Power distribution network operation safety risk early warning method and system

Info

Publication number: CN114529166A
Application number: CN202210085590.7A
Authority: CN
Inventors: 张超; 徐明燕; 刘宇; 王涛; 高岩; 王德栋; 王建东
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-24

Abstract

The invention provides a power distribution network operation safety risk early warning method and a power distribution network operation safety risk early warning system, wherein the power distribution network operation safety risk early warning method comprises the following steps: acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph; the method comprises the steps of analyzing a network topological graph to obtain loads carried by equipment to be overhauled based on the position of the equipment to be overhauled, comprehensively judging risk levels based on load levels and loss load sums to obtain weak links of operation of the power distribution network and give corresponding control measures, comprehensively forming a risk early warning report by on-line information and outputting the risk early warning report, accurately outputting risk information, reducing the occurrence probability of operation faults of the power distribution network to the minimum, and improving the safety and reliability of operation of the power distribution network.

Description

Power distribution network operation safety risk early warning method and system

Technical Field

The invention belongs to the technical field of power grid topology analysis, and particularly relates to a power distribution network operation safety risk early warning method and system.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

With the increasing of domestic electricity and industrial electricity, the scale of the power grid is continuously enlarged, the network structure tends to be complicated, the work of equipment maintenance, line maintenance and the like is greatly increased, and the uncertainty of the operation of the power grid is increased.

At present, most of the power grid operation mode arrangement still depends on non-intelligent means such as manual check, so that the early warning work of power grid dispatching workers is complicated, and the risk information analysis and the early warning information reporting efficiency and the reliability are low.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides a power distribution network operation safety risk early warning method and system, which can perform accurate risk early warning, reduce the occurrence probability of power distribution network operation faults to the minimum, and improve the safety and reliability of power grid operation.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a power distribution network operation safety risk early warning method, which comprises the following steps:

acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph;

analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path does not exist, the load is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled does not have the important load, calculating the sum of the loss loads of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss loads.

Further, the method also comprises the following steps: after the standby power supply path is started, based on the network topological graph, retrieving operation and maintenance units of lines and stations on the standby power supply path, and generating and sending air risk management and control measures to the operation and maintenance units.

Further, the method also comprises the following steps: and generating an early warning notice based on the position of the equipment to be overhauled, the load carried by the equipment to be overhauled, the risk level and the risk management and control measures and by combining a template of the early warning notice.

Further, the network topological graph comprises an alternating current line segment library, a new energy plant station library, an important load library, an operation and maintenance department door library and a plurality of voltage-level plant station databases.

Further, the method for calculating the sum of the loss loads comprises the following steps: searching whether a load carried by the equipment to be overhauled has a standby power supply path, if so, starting the standby power supply path, and updating a network topology structure; if the load has no standby power supply path, the load loses power, and the sum of all the loads losing power is the sum of the lost loads.

The second aspect of the present invention provides a power distribution network operation safety risk early warning system, which includes:

a risk localization module configured to: acquiring equipment to be overhauled, and searching the position of the equipment to be overhauled by combining a network topological graph;

a risk analysis module configured to: analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path is not available, the charged electric charge is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled has no important load, calculating the sum of the loss load of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss load.

Further, the system further comprises a risk management module configured to: and after the standby power supply path is started, retrieving operation and maintenance units of lines and stations on the standby power supply path based on the network topological graph, and sending operation and maintenance instructions to the operation and maintenance units.

Further, the system also comprises a risk pre-warning module configured to: and generating an early warning notice sheet based on the position of the equipment to be overhauled, the load and the risk level of the equipment to be overhauled and the operation and maintenance unit on the standby power supply path by combining a template of the early warning notice sheet.

A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the method for early warning of operational safety risk of a power distribution network as described above.

A fourth aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps in the method for early warning of operational safety risk of a power distribution network as described above.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a power distribution network operation safety risk early warning method, which is characterized in that a power distribution network topological structure is used for tracking and positioning a position where equipment needs to be overhauled or maintained, then risk analysis and evaluation are carried out, weak links of power distribution network operation are judged, corresponding measures are provided, the information is integrated to form a risk early warning report sheet, the work burden of workers is relieved, measures are taken in advance aiming at the weak links of power distribution network operation, the occurrence probability of power distribution network operation faults can be reduced to the minimum, and the safety and the reliability of power distribution network operation are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a general flowchart of a risk early warning method according to a first embodiment of the present invention;

fig. 2 is a network topology diagram of a power distribution network according to a first embodiment of the present invention;

FIG. 3 is a flow chart of risk analysis according to a first embodiment of the present invention;

fig. 4 is a flowchart of a 220kV early warning system according to a first embodiment of the present invention;

fig. 5 is a flowchart of a 110kV early warning system according to a first embodiment of the present invention;

fig. 6 is a flowchart of a 35kV early warning system according to a first embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

The embodiment provides a power distribution network operation safety risk early warning method, as shown in fig. 1, specifically including the following steps:

step 1, constructing a power grid topological graph.

The power distribution network is large in scale, the number of stations at all levels is large, the power transmission line is large in scale, the load importance levels are different, in order to clearly display the grid structure of the power distribution network, the complete relationships between the stations and between lines and stations are presented, meanwhile, better interactivity is realized, and a network topological diagram comprising seven databases, namely an alternating current line segment library, a station database (35kV database, 110kV database and 220kV database) with voltage distribution levels, a new energy station library, an important load library and an operation and maintenance department door library, is constructed.

As an implementation mode, an Excel platform is adopted for carrying out topology building, and a network topology map of seven libraries is constructed. And showing the mutual connection relation among the stations, the lines and the loads in the power distribution network.

As shown in fig. 2, the constructed network topology structure diagram establishes seven topology libraries. The alternating current line segment library comprises power transmission lines with four voltage levels of 10kV, 35kV, 110kV and 220kV, each station in the power distribution network is like scattered points, the alternating current line segment library connects the points into a line, and the points are interlaced to form a net, so that a grid structure of the power distribution network is preliminarily constructed; the 220kV database comprises incoming lines of 220kV stations, outgoing lines of various voltage classes and important loads carried by the outgoing lines, wherein the 220kV stations are important rings in a power distribution network system, and most outgoing lines of the 220kV stations are used as incoming lines of 110kV stations and 35kV stations, so that each outgoing line of the 220kV stations needs to be clearly presented; the 110kV database comprises 110kV incoming lines, upper-level stations thereof, outgoing lines of various voltage levels and important loads; the 35kV database comprises 35kV incoming lines and upper-level plant stations; the important load library divides the load into a first-level important load, a second-level important load and a high-risk user, wherein the first-level user is the most crucial load user, and generally two or more lines from different stations supply power so as to avoid the power loss of the user as much as possible; the operation and maintenance department library comprises operation and maintenance units and local operation and maintenance companies, the scale of a power grid is huge at present, the workload of operation and maintenance of the power distribution network is huge, a plurality of operation and maintenance departments are often used for timely maintaining and maintaining equipment and are respectively responsible for different plant stations and lines, and in order to provide accurate control measures for corresponding lines, the operation and maintenance department to which the line or plant station needing to be maintained belongs needs to know; and the new energy library counts all the distributed power supplies with grid-connected points and grid-connected connecting lines.

Step 2, risk positioning: and acquiring the equipment (or line) to be overhauled, and searching the position of the equipment to be overhauled by combining the network topological graph.

Specifically, the location of the equipment or line to be overhauled is retrieved, and then the affected equipment or line is located. And further searching the network topological graph according to the information of the network topological graph and the position information of the equipment or the line needing to be overhauled and maintained, realizing input positioning through name indexing, and then obtaining a station name or a line name and the like related to the input equipment by using the row indexing.

As an embodiment, this is done using the xlrd function in Python. The xlrd is an expansion tool for reading excel, and can realize the reading of the formulated form and the specified cell.

Step 3, risk analysis: after the overhauled equipment or line is determined, if the other power supply path fails in the process of overhauling and maintaining, searching the next-stage affected load, traversing all the affected loads, and starting the system if the affected loads have standby power supply paths; the load loses power if no alternate path accident occurs. The risk analysis is a comprehensive judgment according to the importance of the loss load and the loss load. The method comprises the steps of firstly, carrying out static stability analysis on a specific running state of line maintenance and equipment maintenance based on a current running state according to historical load data of a power distribution network, and then carrying out risk assessment, wherein the risk assessment has two sets of standards, namely, assessing a risk level by using an importance level of loss load, and assessing a risk level by using a power failure risk. As shown in fig. 3, the method specifically includes the following steps:

step 301: initializing, and finding out weak links of the operation of the power distribution network when equipment or lines are overhauled, namely traversing all affected power equipment sets.

Step 302: selecting equipment, analyzing the network topological graph to obtain loads carried by the equipment to be overhauled, checking whether the loads carried by the equipment are important loads, if so, checking whether the loads have standby power supply paths, if so, starting the standby power supply paths, and updating the power grid topological graph; if no standby power supply path exists, the load loses power, the load is called loss load, and the risk level is judged directly according to the importance level of the loss load.

Step 303: if the equipment does not carry important loads, calculating the lost load when the equipment is overhauled and shut down; and traversing all the affected devices, calculating the total loss load, and judging the risk level according to the sum of the loss loads. In other words, traversing all loads carried by the equipment to be overhauled, having the load of the standby power supply path, starting the standby power supply path, updating the network topology structure, losing power if no load of the standby power supply path exists, and summing all loss loads of power failure, namely the sum of the loss loads; determining a risk level based on the sum of loss loads: the sum of the loss load is more than or equal to 100MW, and is defined as five-level risk; the sum of the loss loads of 40MW or more and less than 100MW is defined as six-grade risk; when the sum of the lost loads is less than 40MW, the load is not classified.

The evaluation criteria for evaluating the risk level by using the load level of the electrical equipment are as follows:

(1) and if all 220kV stations carried by the power equipment are powered off (namely the power loss load is 220kV stations), defining the risk level as five-level risk.

(2) And if the primary important user carried by the power equipment loses power, defining the risk level as a five-level risk.

(3) And if all 110kV stations carried by the power equipment are powered off (namely the power loss load is 110kV stations), defining the risk level as six-level risk.

(4) And if all 110 kilovolt buses of 220 kilovolt stations carried by the power equipment lose power, defining the risk level as six-level risk.

Most of the power loads have two power supply paths, risk analysis is carried out, namely when one power supply path is overhauled, if the other power supply path is also failed, a network topological graph is searched according to historical load data, and the spread range of power failure accidents is checked.

If the equipment to be overhauled is a certain transformer or incoming line of a 220kV station, as shown in fig. 4, during overhauling and maintenance, if another transformer or incoming line fails, all outgoing lines brought by the station lose power. The method comprises the steps of firstly searching a plant station in a 220kV database, then extracting all outgoing lines of the plant station, traversing 110kV lines carried by the plant station, wherein the 110kV lines can be carried by the 110kV plant station or a user load and a local power plant, searching in the 110kV database, finding the 110kV plant station carried by the 110kV lines, checking the other incoming line of the 110kV plant station and the upper-level plant station of the incoming line, and if the two incoming lines are from the same plant station, the 110kV plant station is necessarily power-off. If the two incoming lines come from different stations, the situation is generated, and the 110kV station is only required to be switched to another superior station, so that the station can be prevented from losing power. And if the existing subscriber station has another incoming line, the existing subscriber station can be switched to an upper-level station of the other incoming line, and if the existing subscriber station has no fault, the existing subscriber station loses power. After traversing all the 110kV outgoing lines, traversing the 35kV outgoing lines, and searching one by one in the same steps. And when all lines of the transformer substation are searched, the program stops running.

If the equipment to be overhauled is a 110kV line, as shown in fig. 5, the load carried by the line is affected. The load carried by 110kV may be 110kV plant stations, local power plants and important loads. Firstly, a 110kV line needing to be repaired is searched in a 110kV database, if the line can be found, a 110kV station carried by the line is checked, and then another incoming line of the station is checked. If another incoming line of the station fails during the overhaul of the 110kV line, the station loses power. If the input line cannot be searched in the 110kV database, searching from the important load user database, and then checking whether the user load has another incoming line, if so, only needing to switch the user to another line for supplying power through another incoming line when the accident happens; if there is no other incoming line, the customer load must lose power when an accident occurs. If the line cannot be searched in the load user database, the local power plant database is searched finally, and when the line is overhauled, the local power plant database is used as a grid-connected connecting line of the local power plant, so that the local power plant is disconnected from the power grid. And after the retrieval is finished, the program stops running.

If the equipment to be overhauled is a 35kV line, as shown in fig. 6, the load carried by the line is affected. And searching a 35kV line to be overhauled in the 35kV database, finding a 35kV station carried by the line, and then checking the other incoming line of the station. If another incoming line of the station breaks down during the 35kV line maintenance, the station loses power. No matter whether an input line can be searched in a 35kV database, the line is continuously searched from an important load user database, whether the user load has another incoming line or not is checked, if yes, the user only needs to be switched to another line for standby application when the accident happens, and power is supplied through the other incoming line; if there is no other power supply path, the user load must lose power when an accident occurs. If the line is not searched in the load database, the line is not loaded, and the next line is directly searched. And stopping the program after all lines are searched.

Step 4, risk management and control: after the standby power supply path is started, based on the network topological graph, retrieving operation and maintenance units of lines and stations on the standby power supply path, and generating and sending air risk management and control measures to the operation and maintenance units. Specifically, based on retrieving lines and stations on the standby power supply path, a risk management and control measure is generated by combining a risk management and control measure template, before the standby power supply path is started, an operation and maintenance unit firstly performs patrol inspection on related equipment such as a transformer and a bus, after the standby power supply path is started, operation and maintenance protection work is strengthened, and the original power supply path is restored and needs to be attended.

Specifically, when the equipment is overhauled, the equipment station at the weak link is maintained in advance, and the weak link is enhanced to be inspected when the equipment is overhauled. After the risk analysis is finished, when the affected loads need to be transferred to other stations and other lines, standby lines and operation and maintenance units of the stations need to be searched, and before equipment is overhauled, the standby lines and the stations are subjected to patrol maintenance to prevent power failure accidents after the loads are transferred. And obtaining the risk control measures of the power distribution network before the maintenance plan, and enabling the operation and maintenance department to take different maintenance measures according to different conditions.

Step 5, risk early warning: and generating an early warning notice based on the position of the equipment to be overhauled, the load and the risk level of the equipment to be overhauled, the information of operation and maintenance units and related risk management and control measures on the standby power supply path, and the template of the early warning notice.

In one embodiment, a word document is generated by extracting the content specified in Excel by using Python. This function is implemented using the docxtpl package of Python. Firstly, a Word document, namely a format template of a report to be generated is created, the content of the document comprises risk analysis, management and control requirements, power failure equipment and the like, and then all information is classified and imported into the document.

After the equipment needing to be overhauled is determined, the network topological graph is retrieved through risk positioning, the position of the overhauled equipment is determined, risk analysis is carried out on the basis of position information, the network topological graph is analyzed, weak links of power grid operation are found out, possible power failure accidents and loads to be lost when the accidents happen are predicted, power failure risk assessment of the power distribution network is carried out according to the analyzed risk information to obtain risk levels, risk control is carried out, risk control measures of the power distribution network before an overhaul plan are obtained, operation and maintenance departments can take different maintenance measures according to different conditions, and finally all information is collected to generate an early warning report. The method and the system are progressive layer by layer, after the maintenance equipment is determined, the database is continuously searched, the link of the power distribution network with weak operation is determined, and management and control measures are given to the weak link, so that the probability of the power distribution network failure is greatly reduced during the maintenance of the equipment, and the operation safety is improved.

Example two

The embodiment provides a distribution network operation safety risk early warning system, and it specifically includes following module:

A risk management module configured to: and after the standby power supply path is started, retrieving operation and maintenance units of the lines and the plant stations on the standby power supply path based on the network topological graph.

A risk pre-warning module configured to: and generating an early warning notice sheet based on the position of the equipment to be overhauled, the load and the risk level of the equipment to be overhauled and the operation and maintenance unit on the standby power supply path by combining a template of the early warning notice sheet.

After the equipment needing to be overhauled is determined, the equipment is input into a risk positioning module, a network topological graph is retrieved, the position of the overhauled equipment is determined, and the position information is input into a risk analysis module. The risk analysis module analyzes a network topological graph, finds out weak links of power grid operation, predicts possible power failure accidents and loads to be lost when the accidents happen, evaluates the power failure risk of the power distribution network according to analyzed risk information to obtain risk levels, inputs the information into the risk management and control module, obtains risk management and control measures of the power distribution network before maintenance planning in the risk management and control module, enables operation and maintenance departments to take different maintenance measures according to different conditions, and finally collects all the information in the risk early warning module to generate an early warning report sheet. The four modules of the system progress layer by layer, and after the equipment is determined and overhauled, the database is continuously retrieved, the link of the power distribution network with weak operation is determined, and management and control measures are given to the weak link, so that the probability of the power distribution network breaking down is greatly reduced and the operation safety is improved when the equipment is overhauled and maintained.

The system provided by the invention utilizes the power grid topological graph constructed by Excel, has strong interactivity and is easy to read and modify. And because the outgoing lines and loads of the stations with different levels are different, the specific logic processes are different, and the system designs different logics for the stations with three voltage levels of 220kV, 110kV and 35 kV. At present, power grid dispatching personnel need to manually report risk early warning information every day, and especially in the centralized period of equipment maintenance, the dispatching personnel need to edit a large amount of risk early warning information every day, and much working time is occupied. If the early warning system is applied, according to a maintenance plan, only the equipment line needing to be maintained needs to be input, the early warning report sheet is automatically generated, and the early warning report sheet can be issued after the audit of workers is finished, so that the workload of power grid dispatching personnel is saved, the personnel configuration tends to be more reasonable, the human resource cost is released, and good economic benefit is created.

Taking the 220kV equipment needing to be overhauled or maintained as an example, the importing work of the network topological graph and the inputting work of the overhauling equipment are completed on a network topological graph input interface and a human-computer interaction window. And the importing operation of the network topology map only needs to directly drag the Excel table containing the distribution network topology map into the window. And displaying a window with successful output and import only after dragging the form, and if files in other forms are imported, not leading out the prompt box, so that data initialization is completed, and then, only inputting equipment needing to be overhauled, clicking to start a task, and starting operation of the risk early warning system.

When 220kV equipment needs to be overhauled or maintained, the specific operation steps of generating the early warning report by using the system are as follows: firstly, initializing data, namely importing a network topology map into an input interface for data query, and finishing data initialization if the importing is successful; supposing that a #2 transformer of a 220kV refining station needs to be overhauled, performing risk early warning by using the risk early warning system, inputting the #2 transformer of the 220kV refining station into a data query window, and then clicking to start a task; after the program is operated, a document storage interface appears, the generated risk early warning report is named and stored, and a window for prompting successful storage and program operation completion appears after the storage is clicked; finally, opening a risk early warning report document, namely, when the 220kV refining station #2 transformer needs to be overhauled, a risk early warning report document of the operation safety of the power distribution network is given out in the report document, risks which may occur when the 220kV refining station #2 transformer is overhauled are given out, harm brought by the risks is analyzed, and corresponding control measures are given out, namely, an operation and maintenance center of an operation and maintenance department performs related equipment and line maintenance in advance before the equipment is overhauled, and the related equipment is emphatically patrolled in the process of overhauling the equipment; and finally, the staff audits the report sheet, and the early warning notice sheet can be issued after the audit is correct.

It should be noted that, each module in the present embodiment corresponds to each step in the first embodiment one to one, and the specific implementation process is the same, which is not described herein again.

EXAMPLE III

The present embodiment provides a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the steps in an operation safety risk early warning method for a power distribution network according to the first embodiment of the present invention.

Example four

The embodiment provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the steps in the power distribution network operation safety risk early warning method according to the first embodiment are implemented.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power distribution network operation safety risk early warning method is characterized by comprising the following steps:

analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path does not exist, the load is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled has no important load, calculating the sum of the loss load of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss load.

2. The power distribution network operation safety risk early warning method of claim 1, further comprising: after the standby power supply path is started, based on the network topological graph, retrieving operation and maintenance units of lines and stations on the standby power supply path, and generating and sending air risk management and control measures to the operation and maintenance units.

3. The power distribution network operation safety risk early warning method of claim 2, further comprising: and generating an early warning notice form based on the position of the equipment to be overhauled, the load and risk level of the equipment to be overhauled and the risk management and control measures and by combining a template of the early warning notice form.

4. The power distribution network operation safety risk early warning method according to claim 1, wherein the network topological graph comprises an alternating current line segment library, a new energy plant station library, an important load library, an operation and maintenance department door library and a plant station database with a plurality of voltage levels.

5. The power distribution network operation safety risk early warning method according to claim 1, wherein the calculation method of the loss load sum is as follows: searching whether a load carried by the equipment to be overhauled has a standby power supply path, if so, starting the standby power supply path, and updating a network topological structure; if the load has no standby power supply path, the load loses power, and the sum of all the loads losing power is the sum of the lost loads.

6. The utility model provides a distribution network operation safety risk early warning system which characterized in that includes:

a risk analysis module configured to: analyzing the network topological graph to obtain the load carried by the equipment to be overhauled based on the position of the equipment to be overhauled, and judging whether the load carried by the equipment to be overhauled is an important load or not; if the load is an important load, whether the important load has a standby power supply path or not is searched, if so, the standby power supply path is started, and the network topology structure is updated; if the standby power supply path does not exist, the load is lost, and the risk level is judged based on the importance level of the lost load; and if the equipment to be overhauled has no important load, calculating the sum of the loss load of the equipment to be overhauled when the equipment to be overhauled is shut down, and judging the risk level based on the sum of the loss load.

7. The power distribution network operational safety risk early warning system of claim 6, further comprising a risk management and control module configured to: and after the standby power supply path is started, retrieving operation and maintenance units of lines and stations on the standby power supply path based on the network topological graph, and sending operation and maintenance instructions to the operation and maintenance units.

8. The power distribution network operational safety risk early warning system of claim 7, further comprising a risk early warning module configured to: and generating an early warning notice sheet based on the position of the equipment to be overhauled, the load and the risk level of the equipment to be overhauled and the operation and maintenance unit on the standby power supply path by combining a template of the early warning notice sheet.

9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for operational safety risk early warning of a power distribution network according to any of claims 1 to 5.

10. Computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the program performs the steps of a method for operational safety risk pre-warning of an electric distribution network according to any of claims 1-5.