CN115392790A - Local power grid partitioning method, device, equipment and readable storage medium - Google Patents

Local power grid partitioning method, device, equipment and readable storage medium Download PDF

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CN115392790A
CN115392790A CN202211242322.8A CN202211242322A CN115392790A CN 115392790 A CN115392790 A CN 115392790A CN 202211242322 A CN202211242322 A CN 202211242322A CN 115392790 A CN115392790 A CN 115392790A
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power grid
local power
local
grid
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杨荣照
林建熙
付超
易杨
周保荣
王延纬
姚文峰
陈兴华
朱泽翔
刘宇
刘宇明
谢宇翔
吴为
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CSG Electric Power Research Institute
Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Abstract

The method can quickly determine a target local partition scheme for a target user when an electric power system is subjected to external attack, reduces the scale of the electric power grid, actively separates the physical coupling of the large electric power grid, reduces the attack surface of the external attack through the partition operation of the electric power grid according to the decentralized and localized thought, improves the limit viability of the important load of the local electric power grid for coping with the external attack, is favorable for reducing the load loss amount of the target user in the electric power system after the electric power system is subjected to the external attack, and improves the viability of the target user in the electric power system after the target user is subjected to the external attack.

Description

Local power grid partitioning method, device, equipment and readable storage medium
Technical Field
The present application relates to the field of power security technologies, and in particular, to a local power grid partitioning method, apparatus, device, and readable storage medium.
Background
In the practical application process, the electric power safety is very important. The power system is a high-value attack target as a key infrastructure of the modern society, and external attacks under extreme conditions such as network attacks and physical attacks have great influence on the power system. For example, a network attack or a physical attack on a power grid may cause a malicious switching operation, which may cause a large-area power outage accident and have a great influence. The electric power safety situation becomes more severe, and the breadth, the depth and the difficulty of power grid safety risk management and control under extreme conditions are obviously increased.
The existing power system stability control system mainly takes three traditional safety and stability defense lines as main points: a fault element is quickly cut off, and the fault is prevented from being enlarged; a stable control measure is taken to prevent the system from losing stability; after the system loses stability, large-area power failure is prevented.
The existing power system defense system lacks effective coping plans and risk management and control measures in aiming at extreme situations such as external attack and the like. When an electric power system is subjected to external attack in an extreme case, important loads in a local area are greatly influenced once lost. In actual power grid operation, the operation of dispatching operators to actively separate the power grid is complex, the difficulty of realizing optimal splitting section partitioning based on real-time state quantity solving of the power grid is high, and a local power grid active partitioning strategy is researched, so that how to establish the local partitioning power grid can be determined autonomously, the attack surface of external attack on a power grid system is reduced as much as possible, and the power safety is improved.
Disclosure of Invention
In view of the above, the present application provides a local power grid partitioning method, device, apparatus, and readable storage medium, which are used to solve the technical defect in the prior art that a local power grid partition cannot be determined quickly when an electric power system is attacked.
A local grid partitioning method, comprising:
determining at least one target basic local power grid according to the distribution area of a target user and the power supply information of the distribution area of the target user;
forming at least one target minimum local power grid meeting a preset first condition according to each target basic local power grid;
accessing each target minimum local power grid to a target substation closest to the target minimum local power grid, and searching all target local power grids meeting a preset second condition in all target substations accessed by the target minimum local power grids to obtain a target local power grid set, wherein the target local power grid set comprises at least one target local power grid;
forming a target external attack fault set corresponding to each target local power grid according to the target local power grid set, wherein the target external attack fault set comprises at least one external attack fault aiming at the target local power grid corresponding to the target external attack fault set;
and determining a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
Preferably, the determining at least one target base local power grid according to the distribution area of the target user and the power supply information of the distribution area of the target user includes:
determining at least one target power supply according to the power supply information of the distribution area of the target user;
connecting each target user with the target power supply with the shortest distance to the target user;
determining the shortest power supply path of each target user to the target power supply connected with the target user;
and determining at least one target basic local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, wherein the distance from each target user of the target basic local power grid to the target power supply connected with the target basic local power grid is the shortest power supply path from each target user to the target power supply connected with the target user.
Preferably, the forming at least one target minimum local power grid satisfying a preset first condition according to each target base local power grid includes:
performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid;
judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid;
and if the minimum local power grid which does not cause the load loss of the local power grid when any loop trips exists, taking the minimum local power grid which does not cause the load loss of the local power grid when any loop trips as the target minimum local power grid meeting the preset first condition.
Preferably, the accessing each target minimum local power grid to a target substation with the shortest distance to the target minimum local power grid, and searching all target local power grids meeting a preset second condition in all target substations accessed by each target minimum local power grid to obtain a target local power grid set includes:
accessing each target minimum local power grid into a target substation with the shortest distance to the target substation;
determining all the target substations connected with the target minimum local power grids;
and searching a target minimum local power grid which meets the power and electric quantity balance condition and does not cause local power grid load loss when any loop trips in all the target substations as a target local power grid which meets the preset second condition to obtain a first target local power grid set.
Preferably, the determining a target local grid partitioning scheme based on each target local grid and the target external attack fault set corresponding to each target local grid includes:
calculating the vulnerability index of each target local power grid based on each target local power grid and the target external attack fault set corresponding to each target local power grid to obtain the vulnerability index calculation result of each target local power grid;
sequencing all the calculation results of the vulnerability indexes of the target local power grid to obtain a sequencing result of the calculation results of the vulnerability indexes of the target local power grid;
and selecting the target local power grid with the minimum vulnerability index as a target local power grid partitioning scheme according to the sequencing result of the vulnerability index calculation result of the target local power grid.
A local grid zoning apparatus comprising:
the system comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining at least one target basic local power grid according to a distribution area of a target user and power supply information of the distribution area of the target user;
the second determining unit is used for forming at least one target minimum local power grid meeting a preset first condition according to each target basic local power grid;
a third determining unit, configured to access each target minimum local power grid to a target substation closest to the target minimum local power grid, and search all target local power grids meeting a preset second condition in all target substations accessed by the target minimum local power grids to obtain a target local power grid set, where the target local power grid set includes at least one target local power grid;
a fourth determining unit, configured to form a target external attack fault set corresponding to each target local power grid according to the target local power grid set, where the target external attack fault set includes at least one external attack fault for the target local power grid corresponding to the target external attack fault set;
and a fifth determining unit, configured to determine a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
Preferably, the first determination unit includes:
the power supply determining unit is used for determining at least one target power supply according to the power supply information of the distribution area of the target user;
a first connection unit for connecting each of the target users with the target power supply whose distance is shortest;
a path determination unit for determining a shortest power supply path of each of the target users to the target power source connected thereto;
and the base power grid determining unit is used for determining at least one target base local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, wherein the distance from each target user of the target base local power grid to the target power supply connected with the target user is the shortest power supply path from each target user to the target power supply connected with the target user.
Preferably, the second determining unit includes:
the second connection unit is used for performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid;
the first judgment unit is used for judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid;
and the minimum local power grid determining unit is used for taking the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip as a target minimum local power grid meeting a preset first condition when the execution result of the first judging unit determines that the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip exists.
A local grid partitioning apparatus, comprising: one or more processors, and a memory;
the memory has stored therein computer readable instructions which, when executed by the one or more processors, carry out the steps of the local grid partitioning method as described in any one of the preceding introductions.
A readable storage medium having computer readable instructions stored therein, which, when executed by one or more processors, cause the one or more processors to implement the steps of the local grid partitioning method as described in any of the preceding introductions.
According to the technical scheme, when the power system is attacked externally, the method provided by the embodiment of the application can determine at least one target basic local power grid according to the distribution area of the target user and the power supply information of the distribution area of the target user; after each target base local power grid is determined, at least one target minimum local power grid meeting a preset first condition can be formed further according to each target base local power grid; after each target minimum local power grid is determined, each target minimum local power grid can be accessed to a target substation closest to the target minimum local power grid, and all target local power grids meeting preset second conditions are searched in all target substations accessed to each target minimum local power grid to obtain a target local power grid set, wherein the target local power grid set comprises at least one target local power grid; after each target local power grid is determined, a target external attack fault set corresponding to each target local power grid can be formed according to the target local power grid set, wherein the target external attack fault set comprises at least one external attack fault aiming at the target local power grid corresponding to the target external attack fault set; therefore, after each target local power grid and the target external attack fault set corresponding to the target local power grid are determined, the target local power grid partitioning scheme can be determined based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
According to the method provided by the embodiment of the application, when the power system is attacked from the outside, a target local partition scheme can be quickly determined for a target user, the scale of the power grid is reduced through power grid partition operation, the physical coupling of the large power grid is actively disconnected, the attack face of the outside attack is reduced, the limit viability of the important load of the local power grid for coping with the outside attack is improved, the load loss of the target user in the power system after the power system is attacked from the outside is reduced, and the viability of the target user in the power system after the target user is attacked from the outside is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for partitioning a local power grid according to an embodiment of the present disclosure;
fig. 2 is a grid structure diagram of a local grid in a certain area according to an example of the present application;
fig. 3-6 are schematic diagrams of grid structures of a local power grid according to an example of the present application;
fig. 7 is a schematic structural diagram of a local power grid partitioning apparatus according to an example of the present application;
fig. 8 is a block diagram of a hardware structure of a local power grid partitioning device disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the practical application process, the stability of the alternating-current interconnected power system does not have superposition, the stable subsystems are interconnected to form the alternating-current interconnected power system after the subsystems are stable, the alternating-current interconnected power system is not stable, and once a large power failure occurs in a large-scale synchronous power grid, the loss caused by the large-scale synchronous power grid is far larger than the loss caused by the power failure in a small-scale synchronous power grid.
Therefore, in order to reduce the power failure influence under the external attack as much as possible, the scale of the power grid needs to be reduced through power grid partition operation according to decentralized and localized ideas, the physical coupling of the large power grid is actively disconnected, the attack surface of the external attack is reduced, and the limit viability of important loads of the local power grid for coping with the external attack is improved.
However, in the actual operation of the power grid, the operation of dispatching and operating personnel to actively separate the power grid is complex, and the difficulty of realizing the optimal splitting sectional area based on the real-time state quantity solution of the power grid is high, and a feasible method at present is as follows: a reasonable partition plan is established according to offline analysis, and whether the plan is started to cope with extreme external attacks is judged based on the state of the power grid, but the key problem to be solved at present is how to select the partition plan of the local power grid, so that the local power grid can be quickly partitioned when the power system is attacked.
In view of the fact that most of the existing local power grid partitioning schemes are difficult to adapt to complex and variable service requirements, the applicant researches a local power grid partitioning scheme capable of dealing with external attacks, and the local power grid partitioning scheme can give consideration to a smaller attack surface and provide stronger disturbance resistance. According to the scheme, when the power system is attacked from the outside, a target local partition scheme can be quickly determined for target users, the scale of a power grid is reduced through power grid partition operation according to decentralized and localized ideas, the physical coupling of a large power grid is actively disconnected, the attack surface of the outside attack is reduced, the limit viability of important loads of the local power grid for coping with the outside attack is improved, the load loss of the target users in the power system after the power system is attacked from the outside is reduced, and the viability of the target users in the power system after the target users are attacked from the outside is improved.
The local grid partitioning method provided by the embodiments of the present application can be used in numerous general purpose or special purpose computing device environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multi-processor appliances, distributed computing environments that include any of the above devices or equipment, and the like.
The embodiment of the application provides a local power grid partitioning method, which can be applied to a power system, and can also be applied to various computer terminals or intelligent terminals, and the execution main body of the method can be a processor or a server of the computer terminal or the intelligent terminal.
Referring to fig. 1, a flow of the local power grid partitioning method according to the embodiment of the present application is described below, and as shown in fig. 1, the flow may include the following steps:
step S101, determining at least one target basic local power grid according to a distribution area of a target user and power supply information of the distribution area of the target user.
Specifically, in practical applications, the layout of the power system is generally spread around the target users, and the configuration of the power sources is generally set according to the distribution areas of the target users. The selection of the local power grid must cover important users in the area, and the power supply and the users are connected in series through the simplest power supply path.
Therefore, when a local grid partition needs to be made for the power system in the area where the target user is located, the method provided by the embodiment of the present application may determine at least one target basic local grid according to the distribution area of the target user and the power source information of the distribution area of the target user, where the target basic local grid may include the target user and the relevant information of the power source of the distribution area of the target user.
At least one target basic local power grid can be determined by analyzing the distribution area of the target user and the power supply information of the distribution area of the target user.
Determining the target base local power grid may facilitate determining a partitioning scheme for the local power grid of the area of the target user by analyzing the target base local power grid.
Step S102, forming at least one target minimum local power grid meeting preset first conditions according to each target basic local power grid.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine at least one target basic local power grid according to the distribution area of the target user and the power information of the distribution area of the target user.
And the target basic local power grid is the basis of the local power grid subarea of the area where the target user is located.
Therefore, after determining each of the target base local power grids, at least one target minimum local power grid satisfying a preset first condition may be formed further according to each of the target base local power grids.
The target minimum local power grid may represent a local power grid in a distribution area where the target user is located, where the local power grid may meet a minimum unit of power supply demand of the target user.
Wherein the preset first condition can be set according to the power supply in the distribution area of the target user and the target user.
For example, the target minimum local grid may be determined according to a shortest power supply path from each of the target users to a nearest power source of each target user.
For example, the distance from the target user to the power source in the target minimum local power grid may be set to be the shortest power supply path of the power source.
Step S103, each target minimum local power grid is connected to a target substation closest to the target minimum local power grid, all target local power grids meeting preset second conditions are searched in all target substations connected to the target minimum local power grids, and a target local power grid set is obtained and comprises at least one target local power grid.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may form at least one target minimum local grid that satisfies a preset first condition according to each target base local grid.
The target minimum local power grid may be a minimum local power grid that can meet the power demand of the target user when the power system in the area where the target user is located is subjected to an external attack.
After obtaining each target minimum local power grid, each target minimum local power grid may be further accessed to a target substation closest to the target minimum local power grid, and all target local power grids meeting a preset second condition are searched in all target substations accessed to each target minimum local power grid, so as to obtain a target local power grid set, where the target local power grid set includes at least one target local power grid.
The preset second condition may be set according to the power demand of each target user in each target local power grid and the power supply condition of the target substation in the target local power grid.
For example, the preset second condition may be that each target local grid meets both basic power-electricity balance requirements and basic grid stability requirements.
Determining each of the target local grids may facilitate determining candidate local grid partitioning schemes as a function of each of the target local grids.
Step S104, forming a target external attack fault set corresponding to each target local power grid according to the target local power grid sets, wherein the target external attack fault set comprises at least one external attack fault aiming at the target local power grid corresponding to the target external attack fault set.
Specifically, it can be known from the above description that, in the method provided in the embodiment of the present application, each target minimum local power grid may be connected to a target substation closest to the target minimum local power grid, and all target local power grids meeting the preset second condition are searched in all target substations connected to each target minimum local power grid, so as to obtain a target local power grid set.
Wherein the target set of local power grids may include at least one of the target local power grids.
Each of the target local grids may be a candidate local grid partitioning scheme.
Each of the target local power grids may include information of the target user, a target substation in an area where the target user is located, and a power supply.
After the target local power grid set is determined, a target external attack fault set corresponding to each target local power grid may be further formed according to the target local power grid set, where the target external attack fault set includes at least one external attack fault for the target local power grid corresponding to the target external attack fault set.
In practical application, in extreme cases, the power grid is subjected to external attack forms, which mainly include network attack, electromagnetic attack, graphite bomb attack and terrorist attack.
Wherein the content of the first and second substances,
the network attack mainly destroys or controls the power monitoring network system such as a dispatching automation system, a relay protection system, a safety and stability control system and the like in a network intrusion mode.
The electromagnetic attack mainly releases electromagnetic pulses in the modes of electromagnetic pulse bombs and the like, and damages electronic elements of secondary equipment of the power grid.
The graphite bomb attack mainly causes the short circuit of the primary equipment of the power grid by releasing the conductive fiber net;
damage to electrical utilities is caused by the way the riot attacks the primary violence to destroy the passageway.
According to the target local power grid set, an external attack fault set of each target local power grid can be determined according to the grid structure information of each target local power grid of the target local power grid set.
And forming a target external attack fault set corresponding to each target local power grid for each target local power grid, wherein the target external attack fault set comprises at least one external attack fault aiming at the target local power grid corresponding to the target external attack fault set.
For example, for each target local power grid, the faults caused by network attack, electromagnetic attack, graphite bomb attack and terrorist attack which may be suffered by the target local power grid can be determined, so as to form a target external attack fault set corresponding to each target local power grid, so that the fault conditions of the target local power grids can be analyzed one by one.
Step S105, determining a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
Specifically, it can be known from the above description that the method provided in the embodiment of the present application may determine each target local power grid and the target external attack fault set corresponding to each target local power grid.
Further, based on each target local power grid and the target external attack fault set corresponding to each target local power grid, the relevant situation of the fault caused by that each target local power grid is subjected to different external attacks may be analyzed, for example, the survival capability of each target local power grid and the compliance loss amount of the target user when each target local power grid is subjected to different types of external attacks to generate faults may be analyzed.
After determining the relevant condition of the fault caused by each target local power grid suffering from different external attacks, further determining the target local power grid which is less affected by the fault caused by the different external attacks as the target local power grid partitioning scheme according to the relevant condition of the fault caused by the different external attacks on one target local power grid.
According to the technical scheme, the method provided by the embodiment of the application can quickly determine a target local partition scheme for the target user when the power system is subjected to the external attack, reduces the scale of the power grid, actively splits the physical coupling of the large power grid and reduces the attack surface of the external attack through the partition operation of the power grid according to the decentralized and localized thought, improves the limit viability of the important load of the local power grid for coping with the external attack, is favorable for reducing the load loss amount of the target user in the power system after the power system is subjected to the external attack, and improves the viability of the target user in the power system after the target user is subjected to the external attack.
As can be seen from the above description, the method provided in this embodiment of the present application may determine at least one target basic local power grid according to the distribution area of the target user and the power information of the distribution area of the target user, and then introduces the process, where the process may include the following steps:
step S201, determining at least one target power source according to the power source information of the distribution area of the target user.
Specifically, as can be seen from the above description, the power supply is generally configured according to the distribution area of the target users.
The method provided by the embodiment of the application can acquire the power supply information of the distribution area of the target user, so that at least one target power supply can be determined according to the power supply information of the distribution area of the target user.
Step S202, connecting each target user with the target power supply with the shortest distance to the target user.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine at least one target power source according to the power source information of the distribution area of the target user.
After determining each target power source, each target user may be further connected to the target power source with the shortest distance, so that each target user and each target power source may form a basic power grid.
Step S203, determining the shortest power supply path from each target user to the target power supply connected with the target user.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine at least one target power source according to the power source information of the distribution area of the target users, and connect each target user with the target power source that is the shortest distance away from the target user, so that a basic power grid composed of the target users and the target power sources may be formed.
Further, a shortest power supply path of each of the target users to the target power source connected thereto may be determined so as to be available for determining a target underlying local power grid.
Step S204, determining at least one target basic local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, wherein the distance from each target user of the target basic local power grid to the target power supply connected with the target user is the shortest power supply path from each target user to the target power supply connected with the target user.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine the shortest power supply path from each of the target users to the target power source connected thereto, and further, may determine at least one of the target base local power grids according to the base power grid composed of the target users and the target power source, with the shortest power supply path from each of the target users to the target power source connected thereto.
Wherein the distance from each target user of the target basic local power grid to the target power supply connected with the target user is the shortest power supply path from each target user to the target power supply connected with the target user.
And determining the target basic local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, so that when the power system is attacked from the outside to cause a fault, the power supply guarantee can be provided for the target user closest to each target power supply at the fastest speed.
Candidate local grid partitioning schemes may thus be determined using the target base grid.
According to the technical scheme, the method provided by the embodiment of the application can determine at least one target basic local power grid according to the distribution area of the target users and the power supply information of the distribution area of the target users and the shortest power supply path from each target user to the target power supply connected with the target user, so that when the power system is attacked by the outside to cause a fault, the power supply guarantee can be provided for the target user closest to each target power supply at the fastest speed.
As can be seen from the above description, the method provided in this embodiment of the present application may form at least one target minimum local grid satisfying a preset first condition according to each target basic local grid, and the following process is described, where the process may include the following steps:
step S301, performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid.
Specifically, as can be seen from the foregoing description, the method provided in the embodiment of the present application may determine at least one target basic local power grid according to the distribution area of the target users and the power information of the distribution area of the target users, and according to the shortest power supply path from each target user to the target power supply connected thereto.
After each target basic local power grid is determined, the target basic local power grids can be further subjected to ring network connection, and at least one minimum local power grid can be obtained.
So that it can be determined whether there is a minimum local grid among the minimum local grids that satisfies the N-1 stability constraint.
The minimum local power grids which meet the N-1 stability constraint condition and exist in each minimum local power grid are determined, so that when the power system is attacked from the outside, the power utilization guarantee of each minimum local power grid can be ensured to the maximum extent, and the survival capacity of each minimum local power grid under the limit condition is improved.
The N-1 stability constraint condition means that no local power grid load loss is caused by tripping of any loop in the local power grid in the power grid safety and stability calculation and check.
Step S302, judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may perform ring network connection on each target basic local power grid, so as to obtain at least one minimum local power grid.
After determining each of the minimum local grids, it may be determined whether there is a minimum local grid in each minimum local grid for which no local grid load loss is caused by any loop trip. So that the smallest local grid that meets the N-1 stability constraint can be determined to exist for each of the smallest local grids.
If there is a minimum local grid in which no local grid load loss is caused by any loop trip, it indicates that there is a minimum local grid satisfying the N-1 stability constraint condition in each minimum local grid, so step S303 may be executed.
Step S303, the minimum local power grid which does not cause local power grid load loss when any loop is tripped is taken as the target minimum local power grid meeting the preset first condition.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may perform ring network connection on each target basic local power grid, so as to obtain at least one minimum local power grid. If it is determined that the minimum local power grid which does not cause local power grid load loss due to any loop trip exists in each minimum local power grid, the minimum local power grid which meets the N-1 stability constraint condition and exists in each minimum local power grid is indicated, and the minimum local power grid which does not cause local power grid load loss due to any loop trip can be used as the target minimum local power grid which meets the preset first condition.
According to the technical scheme, the method provided by the embodiment of the application can form at least one target minimum local power grid meeting the preset first condition according to each target basic local power grid, and determine the minimum local power grid meeting the N-1 stability constraint condition existing in each minimum local power grid, so that when the power system is subjected to external attack and fails, the power utilization guarantee of each minimum local power grid can be ensured to the maximum extent, and the survival capacity of each minimum local power grid under the limit condition is improved.
As can be seen from the above description, in the method provided in this embodiment of the present application, each target minimum local power grid may be connected to a target substation having a shortest distance to the target minimum local power grid, and all target local power grids meeting a preset second condition are searched in all target substations connected to each target minimum local power grid, so as to obtain a target local power grid set, and then, the process is described, where the process may include the following steps:
and S401, accessing each target minimum local power grid to a target substation with the shortest distance to the target substation.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine at least one target minimum local power grid.
After determining each of the target minimum local grids, each of the target minimum local grids may be connected to a target substation with the shortest distance thereto. And each target minimum local power grid is connected to a target substation with the shortest distance to the target minimum local power grid, so that the power utilization guarantee of each target minimum local power grid can be ensured.
Step S402, determining all the target substations connected to the target minimum local power grids.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may access each target minimum local power grid to the target substation with the shortest distance to the target minimum local power grid after determining each target minimum local power grid.
Further, after each of the target minimum local grids is connected to the target substation with the shortest distance, all the target substations connected to the respective target minimum local grids may be determined.
And analyzing whether the target local power grids meeting the conditions exist in all the target minimum local power grids or not through the connection architecture of all the target substations and all the target minimum local power grids.
Step S403, searching a target minimum local power grid that meets the power and power balance condition and does not cause local power grid load loss when any loop trips in all the target substations as a target local power grid that meets the preset second condition, and obtaining a first target local power grid set.
Specifically, as can be seen from the foregoing description, the method provided in the embodiment of the present application may determine all the target substations connected to the respective target minimum local power grids after each target minimum local power grid is connected to the target substation with the shortest distance to the target minimum local power grid.
Further, a target minimum local power grid which meets the power and electricity balance condition and does not cause local power grid load loss when any loop trips can be searched in all the target substations to serve as a target local power grid which meets the preset second condition, and a first target local power grid set is obtained.
Wherein the preset second condition may be set to satisfy both the power balance condition and the N-1 stability constraint condition.
According to the technical scheme, each target minimum local power grid can be connected to the target substation with the shortest distance to the target minimum local power grid, all target local power grids meeting the preset second condition are searched in all target substations connected to the target minimum local power grids, and a target local power grid set is obtained, so that a target local power grid partitioning scheme can be determined according to the target local power grid set.
As can be seen from the above description, the method provided in the embodiment of the present application may determine a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid, and then introduces the process, where the process may include the following steps:
step S501, calculating the vulnerability index of each target local power grid based on each target local power grid and the target external attack fault set corresponding to each target local power grid, and obtaining the vulnerability index calculation result of each target local power grid.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may determine each target local power grid and the target external attack fault set corresponding to each target local power grid.
The main purpose of local power grid partitioning is to ensure continuous power supply to important users in extreme cases, so that the local power grid should have strong disturbance rejection capability.
Generally, if the grid structure of the selected local power grid is larger, the disturbance resistance of the local power grid is stronger, but at the same time, the attack area of the local power grid is increased, so that the attack probability is increased. Therefore, the vulnerability index of the local power grid needs to take into account that the local power grid has high disturbance rejection capability and the hit area of the local power grid is as small as possible. Therefore, the comprehensive disturbance rejection capability of the local power grid can be judged by calculating the vulnerability index of the local power grid.
For example, assuming that the power-electricity balance condition and the N-1 stability constraint condition are satisfied, and the target local power grid set composed of all target local power grids covering important users in the area is:
L＝{L 1 ，L 2 ，L 3 ，...,L n }
wherein L is i The method is a target local power grid which meets the power and electric quantity balance condition and the N-1 stability constraint condition and covers all target local power grids of important users in the region.
Under external attacks, either device may be subject to corruption.
The external attack fault set of a certain target local power grid subjected to all external attacks is set as follows:
A i ＝{A 1i ，A i2 ，A i3 ，...,A im }，
wherein the content of the first and second substances,
A i ＝{A 1i ，A i2 ，A i3 ，...,A im there are m faults.
If the selected target local power grid L i The larger the grid structure is, the larger the hit surface of the selected target local power grid is, and the larger the fault set is.
Assuming that the probability of the power grid equipment suffering from external attacks is consistent, the minimum load loss of an important user is taken as a target, and the important load loss can be defined as a target local power grid vulnerability index, namely:
Figure BDA0003885233580000161
wherein the content of the first and second substances,
Lost_A ij for the target local grid L i Failure A after external attack ij The resulting important load loss, which reflects the target local grid L in extreme cases i And after coping with external attacks, the survival ability of important users is improved.
Therefore, each target local power grid and the target external attack fault set corresponding to each target local power grid are determined. The vulnerability index of each target local power grid can be calculated based on each target local power grid and the target external attack fault set corresponding to each target local power grid, and the vulnerability index calculation result of each target local power grid is obtained.
Step S502, sequencing all the calculation results of the vulnerability indexes of the target local power grid to obtain a sequencing result of the calculation results of the vulnerability indexes of the target local power grid.
Specifically, as can be seen from the above description, the method provided in the embodiment of the present application may calculate the vulnerability index of each target local power grid based on each target local power grid and the target external attack fault set corresponding to each target local power grid, so as to obtain the vulnerability index calculation result of each target local power grid.
In order to select from the respective target local network a target local network L in an extreme case i And after the external attack is responded, the target local power grid with the strongest survival capability of the important user is obtained.
After the calculation result of the vulnerability index of each target local power grid is obtained, all the calculation results of the vulnerability index of the target local power grids are sorted, and the sorting result of the calculation results of the vulnerability index of the target local power grids is obtained. And determining the most appropriate target local power grid in the target local power grid set as a target local power grid partitioning scheme according to the sequencing result of the vulnerability index calculation result of the target local power grid.
And S503, selecting the target local power grid with the minimum vulnerability index as a target local power grid partitioning scheme according to the ranking result of the vulnerability index calculation results of the target local power grid.
Specifically, it can be known from the above description that, according to the method provided in the embodiment of the present application, after the calculation result of the vulnerability index of each target local power grid is obtained, all the calculation results of the vulnerability index of the target local power grids are sorted, so as to obtain the sorting result of the calculation results of the vulnerability index of the target local power grids.
After the ranking result of the calculation results of the vulnerability indexes of the target local power grid is obtained, the target local power grid with the minimum vulnerability index can be selected as a target local power grid partitioning scheme according to the ranking result of the calculation results of the vulnerability indexes of the target local power grid.
As can be seen from the above introduced technical solutions, the method provided in the embodiment of the present application may determine a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid. According to the decentralized and localized thought, the scale of the power grid can be reduced through the partition operation of the power grid, the physical coupling of the large power grid can be actively split, the attack surface of external attack can be reduced, the limit viability of the important load of the local power grid for coping with the external attack can be improved, the load loss of target users in the power system after the power system is subjected to the external attack can be reduced, and the viability of the target users in the power system after the target users are subjected to the external attack can be improved.
Next, with reference to fig. 2 to fig. 6, a local power grid partitioning method provided in an embodiment of the present application is described with reference to an example of local power grid partitioning operation of a certain important user distribution area.
Fig. 2 illustrates a grid structure diagram of a local grid of a certain area.
In the context of the present description of figure 2,
a. b, c and d can respectively represent an important user a to an important user d;
A. b, C, D, E, F, G, H, I, J, K, L, M, N, O and P can represent substations A to P;
GEN represents a power supply;
as shown in fig. 2, the important users a to D in the area are respectively supplied with power through 220kV substations a to D, the power supply loads under the substations E to P are all conventional loads, Z is the main transformer for 500kV of the district, and GEN is the only power supply for the local district.
And adopting 2022 year power grid mode data as basic data and configuring a third defense line control measure.
Fig. 3-6 respectively illustrate a grid structure schematic diagram of a local power grid.
The meanings of the characters in fig. 3-6 are introduced with reference to the meanings of the characters in fig. 2, and are not described herein again.
Determining important users a-d and power GEN distribution, and determining a basic local power grid L according to the minimum power supply radius min As shown in fig. 3.
Will be based on the local power grid L min The minimum local power grid L meeting the N-1 stability requirement is formed through the minimum ring network connection 0 As shown in fig. 4.
Based on minimum local electric wire netting L 0 And forming all 220kV target local power grid sets meeting power and electric quantity balance and N-1 stability constraint:
L＝{L 0 ,L 1 ,L 2 ,...}，
wherein the content of the first and second substances,
target local grid L 1 The grid structure is shown in figure 5, and a target local power grid L 2 The grid structure of (a) is shown in fig. 6.
Considering two serious fault types of voltage loss of a single station of all 220kV transformer substation nodes in a target local power grid and full jump of 220kV common-tower lines, establishing an external attack fault set:
A＝{A 0 ,A 1 ,A 2 ,...}
calculating all vulnerability indexes of the target local power grid meeting the conditions through PSD-BPA software simulation:
targeting L of local grid 1 、L 2 、L 0 Taking a partitioning scheme as an example, the L of the target local power grid can be obtained 1 、L 2 、L 0 The calculation result of the vulnerability index is as follows:
Lost 0 ＝1630MW
Lost 1 ＝750MW
Lost 2 ＝2230MW
target local grid L 1 The partitioning scheme is of a ' Chinese character ' ri ' annular structure, the anti-disturbance capacity is stronger compared with other schemes, smaller hit surfaces are considered, and the simulation result also proves the conclusion.
Target local power grid L can be selected 1 As part of the partitionAnd (4) a power grid partition operation scheme.
The local grid partitioning device provided in the embodiment of the present application is described below, and the local grid partitioning device described below and the local grid partitioning method described above may be referred to correspondingly.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a local power grid partitioning apparatus disclosed in the embodiment of the present application.
As shown in fig. 7, the local grid partitioning apparatus may include:
the system comprises a first determining unit 101, a second determining unit and a control unit, wherein the first determining unit is used for determining at least one target basic local power grid according to a distribution area of a target user and power supply information of the distribution area of the target user;
a second determining unit 102, configured to form at least one target minimum local power grid that meets a preset first condition according to each target base local power grid;
a third determining unit 103, configured to access each target minimum local power grid to a target substation closest to the target minimum local power grid, and search all target local power grids meeting a preset second condition in all target substations accessed by the target minimum local power grids to obtain a target local power grid set, where the target local power grid set includes at least one target local power grid;
a fourth determining unit 104, configured to form a target external attack fault set corresponding to each target local power grid according to the target local power grid set, where the target external attack fault set includes at least one external attack fault for the target local power grid corresponding to the target external attack fault set;
a fifth determining unit 105, configured to determine a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
As can be seen from the above-described technical solutions, when the power system is attacked, the apparatus provided in the embodiment of the present application may determine, by using the first determining unit 101, at least one target-based local power grid according to the distribution area of the target user and the power information of the distribution area of the target user; after determining each of the target base local power grids, a second determining unit 102 may be further utilized to form at least one target minimum local power grid satisfying a preset first condition according to each of the target base local power grids; after each target minimum local power grid is determined, a third determining unit 103 may be utilized to access each target minimum local power grid to a target substation closest to the target minimum local power grid, and search all target local power grids meeting a preset second condition in all target substations accessed by each target minimum local power grid to obtain a target local power grid set, where the target local power grid set includes at least one target local power grid; after each target local power grid is determined, a fourth determining unit 104 may be utilized to form a target external attack fault set corresponding to each target local power grid according to the target local power grid set, where the target external attack fault set includes at least one external attack fault for the target local power grid corresponding to the target local power grid; therefore, after determining each target local power grid and the target external attack fault set corresponding to the target local power grid, a target local power grid partitioning scheme may be determined based on each target local power grid and the target external attack fault set corresponding to each target local power grid by using the fifth determining unit 105.
The device provided by the embodiment of the application can rapidly determine a target local partition scheme for a target user when the power system is attacked from the outside, reduces the scale of a power grid, actively decouples the physical coupling of a large power grid and reduces the attack surface of the outside attack through the partition operation of the power grid according to the decentralized and localized thought, improves the limit viability of the important load of the local power grid for coping with the outside attack, is favorable for reducing the load loss of the target user in the power system after the power system is attacked from the outside, and improves the viability of the target user in the power system after the target user is attacked from the outside.
Further optionally, the first determining unit 101 may include:
the power supply determining unit is used for determining at least one target power supply according to the power supply information of the distribution area of the target user;
the first connecting unit is used for connecting each target user with the target power supply with the shortest distance to the target user;
a path determination unit for determining a shortest power supply path of each of the target users to the target power source connected thereto;
a base power grid determining unit, configured to determine at least one target base local power grid according to a shortest power supply path from each target user to the target power source connected thereto, where a distance from each target user of the target base local power grid to the target power source connected thereto is the shortest power supply path from each target user to the target power source connected thereto.
Further optionally, the second determining unit 102 may include:
the second connection unit is used for performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid;
the first judgment unit is used for judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid;
and the minimum local power grid determining unit is used for taking the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip as a target minimum local power grid meeting a preset first condition when the execution result of the first judging unit determines that the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip exists.
Further optionally, the third determining unit 103 may include:
the first substation determining unit is used for accessing each target minimum local power grid to a target substation with the shortest distance to the target substation;
the second substation determination unit is used for determining all the target substations connected with the target minimum local power grids;
and the target local power grid determining unit is used for searching a target minimum local power grid which meets the power and electric quantity balance condition and does not cause local power grid load loss when any loop trips in all the target transformer substations, and taking the target minimum local power grid as a target local power grid which meets the preset second condition to obtain a first target local power grid set.
Further optionally, the fifth determining unit 105 may include:
the first calculation unit is used for calculating the vulnerability index of each target local power grid based on each target local power grid and the target external attack fault set corresponding to each target local power grid to obtain the vulnerability index calculation result of each target local power grid;
the sequencing unit is used for sequencing all the vulnerability index calculation results of the target local power grid to obtain a sequencing result of the vulnerability index calculation results of the target local power grid;
and the power grid partitioning scheme determining unit is used for selecting the target local power grid with the minimum vulnerability index as the target local power grid partitioning scheme according to the sequencing result of the vulnerability index calculation result of the target local power grid.
The specific processing flow of each unit included in the local power grid partitioning apparatus may refer to the related description of the local power grid partitioning method, and is not described herein again.
The local power grid partitioning device provided by the embodiment of the application can be applied to local power grid partitioning equipment, such as a terminal: mobile phones, computers, etc. Optionally, fig. 8 illustrates a block diagram of a hardware structure of the local grid partitioning device, and referring to fig. 8, the hardware structure of the local grid partitioning device may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4.
In the embodiment of the present application, the number of the processor 1, the communication interface 2, the memory 3, and the communication bus 4 is at least one, and the processor 1, the communication interface 2, and the memory 3 complete mutual communication through the communication bus 4.
The processor 1 may be a central processing unit CPU, or an Application Specific Integrated Circuit ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement the embodiments of the present Application, etc.;
the memory 3 may include a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory) or the like, such as at least one disk memory;
wherein the memory stores a program and the processor can call the program stored in the memory, the program for: and realizing each processing flow in the terminal local power grid partitioning scheme.
Embodiments of the present application further provide a readable storage medium, where the storage medium may store a program adapted to be executed by a processor, where the program is configured to: and realizing each processing flow of the terminal in the local power grid partitioning scheme.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. The various embodiments may be combined with each other. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A local grid partitioning method, comprising:
determining at least one target basic local power grid according to the distribution area of a target user and the power supply information of the distribution area of the target user;
forming at least one target minimum local power grid meeting a preset first condition according to each target basic local power grid;
accessing each target minimum local power grid into a target substation closest to the target minimum local power grid, and searching all target local power grids meeting preset second conditions in all target substations accessed by the target minimum local power grids to obtain a target local power grid set, wherein the target local power grid set comprises at least one target local power grid;
forming a target external attack fault set corresponding to each target local power grid according to the target local power grid set, wherein the target external attack fault set comprises at least one external attack fault aiming at the target local power grid corresponding to the target external attack fault set;
and determining a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
2. The method of claim 1, wherein the determining at least one target base local power grid according to the distribution area of the target users and the power supply information of the distribution area of the target users comprises:
determining at least one target power supply according to the power supply information of the distribution area of the target user;
connecting each target user with the target power supply with the shortest distance to the target user;
determining the shortest power supply path of each target user to the target power supply connected with the target user;
and determining at least one target basic local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, wherein the distance from each target user of the target basic local power grid to the target power supply connected with the target basic local power grid is the shortest power supply path from each target user to the target power supply connected with the target user.
3. The method according to claim 1, wherein the forming at least one target minimum local grid satisfying a preset first condition according to each target base local grid comprises:
performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid;
judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid;
and if the minimum local power grid which does not cause the load loss of the local power grid when any loop trips exists, taking the minimum local power grid which does not cause the load loss of the local power grid when any loop trips as the target minimum local power grid meeting the preset first condition.
4. The method according to claim 1, wherein the accessing each target minimum local power grid to a target substation with the shortest distance to the target minimum local power grid, and searching all target local power grids meeting a preset second condition in all target substations accessed by the target minimum local power grids to obtain a target local power grid set comprises:
accessing each target minimum local power grid into a target substation with the shortest distance to the target substation;
determining all the target substations connected with the target minimum local power grids;
and searching a target minimum local power grid which meets the power and electric quantity balance condition and does not cause local power grid load loss when any loop trips in all the target substations as a target local power grid which meets the preset second condition to obtain a first target local power grid set.
5. The method according to any one of claims 1 to 4, wherein the determining a target local grid partitioning scheme based on each of the target local grids and the target external attack fault set corresponding to each of the target local grids comprises:
calculating the vulnerability index of each target local power grid based on each target local power grid and the target external attack fault set corresponding to each target local power grid to obtain the vulnerability index calculation result of each target local power grid;
sequencing all the calculation results of the vulnerability indexes of the target local power grid to obtain a sequencing result of the calculation results of the vulnerability indexes of the target local power grid;
and selecting the target local power grid with the minimum vulnerability index as a target local power grid partitioning scheme according to the sequencing result of the vulnerability index calculation result of the target local power grid.
6. A local grid partitioning apparatus, comprising:
the system comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining at least one target basic local power grid according to a distribution area of a target user and power supply information of the distribution area of the target user;
the second determining unit is used for forming at least one target minimum local power grid meeting a preset first condition according to each target basic local power grid;
a third determining unit, configured to access each target minimum local power grid to a target substation closest to the target minimum local power grid, and search all target local power grids meeting a preset second condition in all target substations accessed by the target minimum local power grids to obtain a target local power grid set, where the target local power grid set includes at least one target local power grid;
a fourth determining unit, configured to form a target external attack fault set corresponding to each target local power grid according to the target local power grid set, where the target external attack fault set includes at least one external attack fault for the target local power grid corresponding to the target external attack fault set;
and a fifth determining unit, configured to determine a target local power grid partitioning scheme based on each target local power grid and the target external attack fault set corresponding to each target local power grid.
7. The apparatus of claim 6, wherein the first determining unit comprises:
the power supply determining unit is used for determining at least one target power supply according to the power supply information of the distribution area of the target user;
a first connection unit for connecting each of the target users with the target power supply whose distance is shortest;
a path determination unit for determining a shortest power supply path of each of the target users to the target power source connected thereto;
and the base power grid determining unit is used for determining at least one target base local power grid according to the shortest power supply path from each target user to the target power supply connected with the target user, wherein the distance from each target user of the target base local power grid to the target power supply connected with the target user is the shortest power supply path from each target user to the target power supply connected with the target user.
8. The apparatus of claim 6, wherein the second determining unit comprises:
the second connection unit is used for performing ring network connection on each target basic local power grid to obtain at least one minimum local power grid;
the first judgment unit is used for judging whether the minimum local power grids which do not cause local power grid load loss due to any loop tripping exist in each minimum local power grid;
and the minimum local power grid determining unit is used for taking the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip as a target minimum local power grid meeting a preset first condition when the execution result of the first judging unit determines that the minimum local power grid which does not cause the load loss of the local power grid due to any loop trip exists.
9. A local grid partitioning apparatus, comprising: one or more processors, and a memory;
the memory has stored therein computer readable instructions which, when executed by the one or more processors, carry out the steps of the local grid partitioning method according to any one of claims 1 to 5.
10. A readable storage medium, characterized by: the readable storage medium having stored therein computer readable instructions, which, when executed by one or more processors, cause the one or more processors to carry out the steps of the local grid partitioning method according to any one of claims 1 to 5.
CN202211242322.8A 2022-10-11 2022-10-11 Local power grid partitioning method, device, equipment and readable storage medium Pending CN115392790A (en)

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