CN114143204B - Power grid relay protection setting key node screening method, device, terminal and medium - Google Patents
Power grid relay protection setting key node screening method, device, terminal and medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 82
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- 238000012545 processing Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 4
- 238000010606 normalization Methods 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
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- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- G—PHYSICS
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The application discloses a screening method, a screening device, a screening terminal and a screening medium for power grid relay protection setting key nodes. According to the method provided by the application, based on the acquired power grid network topology, the aggregation degree, the protection response sensitivity and the protection response coordination degree index of the power grid nodes are calculated respectively by combining the data such as the association state, the average distance and the impedance parameter among the nodes in the power grid network topology, and then the attention degree of the target nodes is calculated by a weighted summation mode based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, so that the attention degree of different target nodes is compared, thereby determining the key nodes, and the technical problem of low reliability of the key nodes which need to be set in the special operation period of the power grid according to the historical data and the personal experience is solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a method, a device, a terminal and a medium for screening power grid relay protection setting key nodes.
Background
With the rapid development of the national power grid scale, the grid structure is increasingly complex, and higher requirements are put forward on the safe and stable operation of the power grid. Besides the normal operation mode, the power grid has a special operation mode caused by various reasons, such as direct current blocking, common mode faults, natural disasters, high-proportion new energy access, abnormal operation during the 'head-station sleeve' period of the major equipment and the like. The problem caused by the risk of safe and stable operation of the power grid can cause instability of the power grid, and partial first and second equipment outage, so that the power grid is in a special operation mode in a period of time, and the applicability of relay protection fixed values is poor in a normal operation mode during the special operation mode of the power grid, the probability of misoperation and refusal of protection is increased, and the probability of power grid loss expansion is increased. Therefore, the re-setting and verification of relay protection after the operation mode is changed is particularly important for safe and stable operation and quick and reliable recovery of the power grid.
Because the network structure of the complex large power grid is complex, the number of nodes is numerous, the time and effort are very consumed for setting and checking relay protection at each node, the conventional method is to screen out part of key nodes which are easy to malfunction or refusal to operate in advance, setting and checking are carried out on protection equipment at the key nodes, and the screening mode is to analyze and push according to historical data and personal experience, so that the technical problem of low reliability exists.
Disclosure of Invention
The application provides a method, a device, a terminal and a medium for screening key nodes for power grid relay protection setting, which are used for solving the technical problem of low reliability in the prior art of screening key nodes to be set according to historical data and personal experience during special operation of a power grid.
The first aspect of the application provides a screening method for power grid relay protection setting key nodes, which comprises the following steps:
based on the acquired power grid network topology, calculating the condensation degree of the target node by combining the association state and the average distance among the nodes in the power grid network topology and a preset node shrinkage degree calculation mode;
determining a first node and a second node based on line impedance among nodes in the power grid network topology, and performing Thevenin equivalent processing on the target node, the first node and the second node to construct an equivalent network, wherein the first node is a node with the largest line impedance among all nodes connected with the target node, and the second node is a node with the smallest line impedance among all nodes connected with the first node;
calculating the protection response sensitivity of the target node through a preset node sensitivity calculation mode based on the equivalent network and impedance parameters among all nodes in the equivalent network;
calculating the protection response coordination degree of the target node by combining the preset ratio of the protection range to the total length of the line based on the equivalent network and the impedance parameters in the equivalent network and through a preset node coordination degree calculation mode;
and calculating the attention degree of the target nodes by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient so as to determine key nodes by comparing the attention degrees of different target nodes.
Preferably, the calculating process of the weight coefficient specifically includes:
based on a preset index weight influence condition, under the index weight influence condition, constructing an index comparison matrix through a three-scale method according to the degree of aggregation, the sensitivity of the protection response and the relative importance degree among the protection response coordination degrees;
constructing a judgment matrix by a polar difference calculation method based on the index comparison matrix;
and solving the judgment matrix to obtain the aggregation degree, the protection response sensitivity and the weight coefficient corresponding to the protection response coordination degree.
Preferably, the index weight influence condition specifically includes: false action concern scene influence conditions and refusal action concern scene influence conditions;
the weight coefficient specifically comprises: false action attention weight coefficient and refusal action attention weight coefficient.
Preferably, before calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, the method further comprises:
and respectively carrying out normalization operation on the condensation degree, the protection response sensitivity and the protection response coordination degree so as to calculate the attention degree of the target node through the normalized condensation degree, the normalized protection response sensitivity and the normalized protection response coordination degree.
Preferably, after calculating the attention of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, and before determining the key node, the method further comprises:
when the weight coefficient for calculating the attention degree is a false action attention weight coefficient, screening out the target node with the protection response coordination degree larger than a first coordination degree threshold according to the protection response coordination degree of the target node;
and when the weight coefficient for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response coordination degree not larger than a first coordination degree threshold according to the protection response coordination degree of the target node.
Preferably, after calculating the attention of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, and before determining the key node, the method further comprises:
when the weight coefficient used for calculating the attention degree is a false action attention weight coefficient, screening out a target node with the protection response relative sensitivity smaller than a first relative sensitivity threshold according to the protection response relative sensitivity of the target node, wherein the protection response relative sensitivity is obtained by normalizing the protection response sensitivity;
and when the weight coefficient used for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response relative sensitivity larger than a second relative sensitivity threshold according to the protection response relative sensitivity of the target node.
Preferably, the calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient further comprises:
and sequencing the target nodes according to the attention degree.
The second aspect of the application provides a screening device for power grid relay protection setting key nodes, which comprises the following components:
the node condensation degree calculation unit is used for calculating the condensation degree of the target node by combining the association state and the average distance among the nodes in the power grid network topology based on the acquired power grid network topology in a preset node shrinkage degree calculation mode;
an equivalent network construction unit, configured to determine a first node and a second node based on line impedance between nodes in the power grid network topology, and perform davian equivalent processing on the target node, the first node, and the second node, to construct an equivalent network, where the first node is a node with the largest line impedance between the target nodes among all nodes connected to the target node, and the second node is a node with the smallest line impedance between the first nodes among all nodes connected to the first node;
the node sensitivity calculation unit is used for calculating the protection response sensitivity of the target node through a preset node sensitivity calculation mode based on the equivalent network and the impedance parameters among all nodes in the equivalent network;
the node coordination degree calculation unit is used for calculating the protection response coordination degree of the target node by combining the preset protection range with the ratio of the total length of the line based on the equivalent network and the impedance parameters in the equivalent network and through a preset node coordination degree calculation mode;
and the key node determining unit is used for calculating the attention degree of the target nodes in a weighted summation mode based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient so as to determine the key nodes by comparing the attention degrees of different target nodes.
The third aspect of the application provides a power grid relay protection setting key node screening terminal, which comprises the following steps: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to the screening method of the power grid relay protection setting key nodes provided by the first aspect of the application;
the processor is configured to execute the program code.
A fourth aspect of the present application provides a computer readable storage medium, in which program code corresponding to a power grid relay protection setting key node screening method as provided in the first aspect of the present application is stored.
From the above technical solutions, the embodiment of the present application has the following advantages:
according to the method provided by the application, based on the acquired power grid network topology, the aggregation degree, the protection response sensitivity and the protection response coordination degree index of the power grid nodes are calculated respectively by combining the data such as the association state, the average distance and the impedance parameter among the nodes in the power grid network topology, and then the attention degree of the target nodes is calculated by a weighted summation mode based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, so that the attention degree of different target nodes is compared, thereby determining the key nodes, and the technical problem of low reliability of the key nodes which need to be set in the special operation period of the power grid according to the historical data and the personal experience is solved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic flow chart of an embodiment of a method for screening key nodes in power grid relay protection setting.
Fig. 2 is a topology diagram of a target node, a first node and a second node according to the present application.
Fig. 3 is a topology of an equivalent network as referred to in the present application.
Fig. 4 is a schematic flow chart of a process for calculating a weight coefficient in a screening method of a power grid relay protection setting key node.
Fig. 5 is a schematic structural diagram of an embodiment of a screening device for power grid relay protection setting key nodes.
Detailed Description
The embodiment of the application provides a method, a device, a terminal and a medium for screening key nodes for power grid relay protection setting, which are used for solving the technical problem of low reliability in the prior art of screening key nodes to be set according to historical data and personal experience during special operation of a power grid.
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, a method for screening key nodes for power grid relay protection setting according to a first embodiment of the present application includes:
step 101, calculating the condensation degree of the target node by combining the association state and the average distance between the nodes in the power grid network topology based on the acquired power grid network topology and through a preset node shrinkage degree calculation mode.
It should be noted that the network topology of the complex large power grid can be equivalent to an undirected network, and the aggregation degree of the complex large power grid can be calculated according to the shrinkage degree of each node in the network, and the aggregation degree of the node is positively related to the importance degree of the node in the network. And combining the power grid topology, initializing the link value of the undirected network, and then obtaining a weighting matrix of the undirected network. And calculating the shortest path among the nodes, obtaining the link number of the shortest path, and finally obtaining the average distance under the shortest path among the nodes. Let the total number of nodes of the undirected network be n and the average distance between the nodes be d, which represents the arithmetic average of the shortest distances between all the nodes. Defining the network aggregation level as the inverse of the product of the number of network nodes and the average distance, the network aggregation level Q may be expressed as:
（1）
wherein, representsThe weighted shortest distance from the target node i to the node j.
The degree of aggregation of node iCan be expressed as:
（2）
in the method, in the process of the application,the network condensation degree after node i is contracted; />A number of nodes associated with node i; />Is the average distance between the network nodes after node i is contracted. Can be obtained by the method (2)As is known, the greater the number of nodes associated with node i, the fewer the number of nodes associated with node i after contraction, and the greater the corresponding degree of aggregation.
Step 102, determining a first node and a second node based on line impedance among nodes in the power grid network topology, and performing Thevenin equivalent processing on the target node, the first node and the second node to construct an equivalent network.
The first node is the node with the largest line impedance with the target node among all nodes connected with the target node, and the second node is the node with the smallest line impedance with the first node among all nodes connected with the first node.
It should be noted that, in the network topology of the power grid, for the selected target node i, there is a network structure as shown in fig. 2. In the drawing the view of the figure,is the first line with the highest impedance value among all lines connected with the node i, i.e. the node m is the line +.>Is (are) the other side node of->Is the first line with the smallest impedance value in all lines connected with the node m, and the second node, namely the node n is the line +.>Is connected to the other side node of the network.
Removing the lineAnd->The Thevenin equivalent is carried out on the nodes i, m and n, and a line is added into an equivalent network>And (3) withThe new equivalent network is obtained as shown in figure 3.
And step 103, calculating the protection response sensitivity of the target node through a preset node sensitivity calculation mode based on the equivalent network and the impedance parameters among all nodes in the equivalent network.
It should be noted that, based on the equivalent network topology shown in fig. 3, in the figure,，/>，/>equivalent power supplies for nodes i, m and n, respectively,/->，/>，/>Respectively the internal impedance of the equivalent power supply; />Is a line->Impedance of->Is a circuitImpedance of->Is the equivalent line between nodes i and m +.>Impedance of (c);/>is a line->Impedance of->Is the equivalent line between nodes m and n +.>Impedance of (c); />Is the equivalent line between nodes i and n +.>Is a high-frequency power source.
Defining the protection response sensitivity of the node i according to the equivalent networkThe method comprises the following steps:
（3）
in the method, in the process of the application,
（4）
the protection response sensitivity index of the node indicates that only the false operation tendency of relay protection is considered, and if the protection response sensitivity of the node is higher, the probability of false operation of relay protection at the node is higher.
Step 104, calculating the protection response coordination degree of the target node by a preset node coordination degree calculation mode based on the equivalent network and the impedance parameters in the equivalent network and combining the ratio of the preset protection range to the total length of the line.
It should be noted that, based on the equivalent network shown in fig. 3, the protection range of the combination protection primary setting is90% of the total length of the line), defining the degree of coordination of the node i asAnd satisfies:
（5）
as can be seen from formula (5), whenWhen the value is less than (equal to) 1, the smaller the value is, the lower the possibility of protection against motion is; />When the value is larger than 1, the higher the value is, the higher the possibility of guard rejection is.
And 105, calculating the attention degree of the target nodes by a weighted summation mode based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient so as to determine the key nodes by comparing the attention degrees of different target nodes.
It should be noted that, based on the condensation degree, the protection response sensitivity and the protection response coordination degree obtained in the above steps, the attention degree of the target node is calculated by combining the corresponding weight coefficients, the attention degree represents the importance degree of the target node, the attention degree of other target nodes can be obtained through the step flow mentioned in the above steps, and then the key nodes can be determined from the network topology of the power grid according to the attention degree data of the nodes by comparing the attention degrees of different target nodes.
The foregoing details of the first embodiment of the method for screening the key node for power grid relay protection setting provided by the present application, and the following details of another embodiment of the method for screening the key node for power grid relay protection setting provided by the present application.
Referring to fig. 4, a second embodiment of the present application provides a method for screening a key node for power grid relay protection setting based on the first embodiment, including:
further, based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, before calculating the attention degree of the target node by a weighted summation mode, the method may further include:
and respectively carrying out normalization operation on the condensation degree, the protection response sensitivity and the protection response coordination degree so as to calculate the attention degree of the target node through the normalized condensation degree, the normalized protection response sensitivity and the normalized protection response coordination degree.
Under the current operation mode, calculating the condensation degree, sensitivity and coordination degree of all nodes of the power grid, and respectively carrying out normalization processing on the three to obtain the relative condensation degree of the node iRelative sensitivity->Relative degree of fit->As shown in formula (6).
（6）
In the method, in the process of the application,、/>and->Respectively calculating the maximum value of node condensation degree, sensitivity and coordination degree in the result; />、/>And->Respectively the minimum values of node aggregation degree, sensitivity and coordination degree in the calculation result.
When only protection misoperation is considered, the attention degree of the node i is definedThe method comprises the following steps:
（7）
in the method, in the process of the application,、/>and->The weight of the three indexes of the condensation degree, the sensitivity and the coordination degree are only considered when the protection malfunction is caused.
As can be seen from the formula (7), the calculation of the attention priority of the power system node relates to three indexes of node aggregation degree, sensitivity and coordination degree, and the higher the node aggregation degree is, the more important the node plays in the network, and the more normal relay protection is required; the higher the node sensitivity is, the easier the protection is for misoperation, and the larger the setting and checking requirements of relay protection after the operation mode is changed are; since false operation is possible only when protection is not refused, the lower the node matching degree is, the less easy the protection is refused and the more easy the false operation is.
When only considering protection refusal, defining the attention degree of the node iThe method comprises the following steps:
（8）
in the method, in the process of the application,、/>and->The weight of the three indexes of the condensation degree, the sensitivity and the coordination degree when only the protection refusal is considered is respectively.
As can be seen from the equation (8), similarly to the calculation of the attention degree of malfunction, since the malfunction is likely to be rejected without malfunction of the protection, the lower the node sensitivity is, the less likely the malfunction is to be protected, and the more likely the malfunction is to be rejected.
Further, the weight coefficient mentioned in the first embodiment specifically includes:
step 201, constructing an index comparison matrix by a three-scale method according to the relative importance degree among the condensation degree, the protection response sensitivity and the protection response coordination degree under the index weight influence condition based on a preset index weight influence condition;
step 202, constructing a judgment matrix based on the index comparison matrix by a polar difference calculation method;
and 203, solving the judgment matrix to obtain the aggregation degree, the protection response sensitivity and the weight coefficient corresponding to the protection response coordination degree.
It should be noted that, in order to avoid assigning weights of three important indexes completely by subjective consciousness, the weight coefficients are calculated by using a hierarchical analysis method, and the calculation steps are as follows:
1) According to the qualitative assessment of the relative importance among indexes, an index comparison matrix CP can be constructed by adopting a three-scale method.
（9）
In the method, in the process of the application,an element of the matrix CP, i.e., the index i is scored compared to the index j for importance; />Is the final score of index i.
2) And constructing a judgment matrix H according to a pole difference method.
（10）
In the method, in the process of the application,；
3) After consistency test is carried out on the judgment matrix, the weight of the index i can be obtainedIs that
（11）
In the method, in the process of the application,；
further, the index weight influence conditions specifically include: false action concern scene influence conditions and refusal action concern scene influence conditions;
the weight coefficient specifically comprises: false action attention weight coefficient and refusal action attention weight coefficient.
Further, calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient may further include:
and sequencing the target nodes according to the degree of attention.
Further, calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, and before determining the key node, the method may further include:
when the weight coefficient for calculating the attention degree is the misoperation attention weight coefficient, screening out the target node with the protection response coordination degree larger than the first coordination degree threshold according to the protection response coordination degree of the target node;
when the weight coefficient for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response coordination degree not larger than the first coordination degree threshold according to the protection response coordination degree of the target node.
In some particular embodiments, it may further comprise:
when the weight coefficient used for calculating the attention degree is the false action attention weight coefficient, screening out the target node with the protection response relative sensitivity smaller than the first relative sensitivity threshold according to the protection response relative sensitivity of the target node, wherein the protection response relative sensitivity is obtained by normalizing the protection response sensitivity.
And when the weight coefficient for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response relative sensitivity larger than the second relative sensitivity threshold according to the protection response relative sensitivity of the target node.
The aggregation, sensitivity and matching degree of the nodes are calculated by the formula (6) assuming that the total number of nodes in the whole network is n, and are recorded asThe node i and the three indexes thereof form a set. Calculating the attention degree of the network node only when the protection misoperation is considered through formulas (7) and (11), and marking asThe attention degree set of the node i and the corresponding node when only the protection malfunction is considered is shown. Calculating by equations (8) and (11) the degree of interest of the network node considering only protection refusal, and recording asThe attention degree set of the node i and the corresponding node when only the protection malfunction is considered is shown.
Construction of node sequences considering only protection maloperationThe steps of (a) are as follows:
will be assembledThe elements in (a) are rearranged from big to small according to the attention degree to form a set +.>；
According toIn the degree of fit value, will be assembled->All nodes with the coordination degree more than 1 or the relative sensitivity less than 20 percent are screened out to form a node sequence set +.>。
Constructing node sequences considering protection refusal onlyThe steps of (a) are as follows:
(1) will be assembledThe elements in (a) are rearranged from big to small according to the attention degree to form a set +.>；
(2) According toIn the degree of fit value, will be assembled->All nodes with the coordination degree less than or equal to 1 or the relative sensitivity more than 80 percent are screened out to form a node sequence set +.>。
The above is a detailed description of the second embodiment of the method for screening the key node for power grid relay protection setting provided by the present application, and the following is a detailed description of one embodiment of the device for screening the key node for power grid relay protection setting provided by the present application.
Referring to fig. 5, a third embodiment of the present application provides a power grid relay protection setting key node screening device, including:
the node condensation degree calculating unit 301 is configured to calculate a condensation degree of a target node according to an obtained power grid network topology and by combining a correlation state and an average distance between nodes in the power grid network topology in a preset node shrinkage degree calculating manner;
the equivalent network construction unit 302 is configured to determine a first node and a second node based on line impedance between nodes in a power grid network topology, and perform davin equivalent processing on a target node, the first node and the second node to construct an equivalent network, where the first node is a node with the largest line impedance between the target node among all nodes connected with the target node, and the second node is a node with the smallest line impedance between the first node among all nodes connected with the first node;
the node sensitivity calculation unit 303 is configured to calculate a protection response sensitivity of the target node according to a preset node sensitivity calculation mode based on the equivalent network and impedance parameters among nodes in the equivalent network;
the node coordination degree calculating unit 304 is configured to calculate a protection response coordination degree of the target node according to a preset node coordination degree calculating mode by combining a preset protection range with a ratio of the total length of the line based on the equivalent network and impedance parameters in the equivalent network;
the key node determining unit 305 is configured to calculate the attention degree of the target node by a weighted summation manner based on the aggregation degree, the protection response sensitivity, the protection response coordination degree, and the weight coefficient, so as to determine the key node by comparing the attention degrees of different target nodes.
The above is a detailed description of an embodiment of a power grid relay protection setting key node screening device provided by the application, and the following is a detailed description of an embodiment of a power grid relay protection setting key node screening terminal and a computer readable storage medium provided by the application.
In addition, a fourth embodiment of the present application provides a power grid relay protection setting key node screening terminal, including: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to the screening method of the power grid relay protection setting key nodes provided by the first embodiment or the second embodiment of the application;
the processor is configured to execute the program code.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the terminal, apparatus and unit described above may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
Furthermore, a fifth embodiment of the present application provides a computer readable storage medium, in which program code corresponding to a power grid relay protection setting key node screening method as provided in the first embodiment or the second embodiment of the present application is stored.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides a power grid relay protection setting key node screening method which is characterized by comprising the following steps:
based on the acquired power grid network topology, calculating the condensation degree of the target node by combining the association state and the average distance among the nodes in the power grid network topology and a preset node shrinkage degree calculation mode;
determining a first node and a second node based on line impedance among nodes in the power grid network topology, and performing Thevenin equivalent processing on the target node, the first node and the second node to construct an equivalent network, wherein the first node is a node with the largest line impedance among all nodes connected with the target node, and the second node is a node with the smallest line impedance among all nodes connected with the first node;
calculating the protection response sensitivity of the target node through a preset node sensitivity calculation mode based on the equivalent network and impedance parameters among all nodes in the equivalent network;
the calculation formula of the protection response sensitivity is as follows:
；
；
；
；
；
；
in the method, in the process of the application,，/>，/>respectively the internal impedance of the equivalent power supply; />Is a line->Impedance of->Is the equivalent line between nodes i and m +.>Impedance of (c); />Is a line->Impedance of->Is the equivalent line between nodes m and n +.>Impedance of (c); />Is the equivalent line between nodes i and n +.>Impedance of (c);
calculating the protection response coordination degree of the target node by combining the preset ratio of the protection range to the total length of the line based on the equivalent network and the impedance parameters in the equivalent network and through a preset node coordination degree calculation mode;
the calculation formula of the protection response coordination degree is as follows:
；
in the method, in the process of the application,for node i's degree of fit, +.>Is a line->Impedance of (c);
and calculating the attention degree of the target nodes by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient so as to determine key nodes by comparing the attention degrees of different target nodes.
2. The power grid relay protection setting key node screening method according to claim 1, wherein the calculation process of the weight coefficient is specifically as follows:
based on a preset index weight influence condition, under the index weight influence condition, constructing an index comparison matrix through a three-scale method according to the degree of aggregation, the sensitivity of the protection response and the relative importance degree among the protection response coordination degrees;
constructing a judgment matrix by a polar difference calculation method based on the index comparison matrix;
and solving the judgment matrix to obtain the aggregation degree, the protection response sensitivity and the weight coefficient corresponding to the protection response coordination degree.
3. The method for screening the power grid relay protection setting key nodes according to claim 2, wherein the index weight influence condition specifically comprises: false action concern scene influence conditions and refusal action concern scene influence conditions;
the weight coefficient specifically comprises: false action attention weight coefficient and refusal action attention weight coefficient.
4. The method for screening the key node for power grid relay protection setting according to claim 3, wherein before calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, the method further comprises:
and respectively carrying out normalization operation on the condensation degree, the protection response sensitivity and the protection response coordination degree so as to calculate the attention degree of the target node through the normalized condensation degree, the normalized protection response sensitivity and the normalized protection response coordination degree.
5. The method for screening the key node for power grid relay protection setting according to claim 3 or 4, wherein the calculating the attention of the target node by a weighted summation method based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, and before determining the key node, further comprises:
when the weight coefficient for calculating the attention degree is a false action attention weight coefficient, screening out the target node with the protection response coordination degree larger than a first coordination degree threshold according to the protection response coordination degree of the target node;
and when the weight coefficient for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response coordination degree not larger than a first coordination degree threshold according to the protection response coordination degree of the target node.
6. The method for screening the key node for power grid relay protection setting according to claim 4, wherein the calculating the attention of the target node by a weighted summation method based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient, and before determining the key node, further comprises:
when the weight coefficient used for calculating the attention degree is a false action attention weight coefficient, screening out a target node with the protection response relative sensitivity smaller than a first relative sensitivity threshold according to the protection response relative sensitivity of the target node, wherein the protection response relative sensitivity is obtained by normalizing the protection response sensitivity;
and when the weight coefficient used for calculating the attention degree is the refused attention weight coefficient, screening out the target node with the protection response relative sensitivity larger than a second relative sensitivity threshold according to the protection response relative sensitivity of the target node.
7. The method for screening the key node for power grid relay protection setting according to claim 1, wherein the calculating the attention degree of the target node by a weighted summation mode based on the condensation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient further comprises:
and sequencing the target nodes according to the attention degree.
8. The utility model provides a power grid relay protection setting key node sieving mechanism which characterized in that includes:
the node condensation degree calculation unit is used for calculating the condensation degree of the target node by combining the association state and the average distance among the nodes in the power grid network topology based on the acquired power grid network topology in a preset node shrinkage degree calculation mode;
an equivalent network construction unit, configured to determine a first node and a second node based on line impedance between nodes in the power grid network topology, and perform davian equivalent processing on the target node, the first node, and the second node, to construct an equivalent network, where the first node is a node with the largest line impedance between the target nodes among all nodes connected to the target node, and the second node is a node with the smallest line impedance between the first nodes among all nodes connected to the first node;
the node sensitivity calculation unit is used for calculating the protection response sensitivity of the target node through a preset node sensitivity calculation mode based on the equivalent network and the impedance parameters among all nodes in the equivalent network;
the calculation formula of the protection response sensitivity is as follows:
；
；
；
；
；
；
in the method, in the process of the application,，/>，/>respectively the internal impedance of the equivalent power supply; />Is a line->Impedance of->Is the equivalent line between nodes i and m +.>Impedance of (c); />Is a line->Impedance of->Is the equivalent line between nodes m and n +.>Impedance of (c); />Is the equivalent line between nodes i and n +.>Impedance of (c);
the node coordination degree calculation unit is used for calculating the protection response coordination degree of the target node by combining the preset protection range with the ratio of the total length of the line based on the equivalent network and the impedance parameters in the equivalent network and through a preset node coordination degree calculation mode;
the calculation formula of the protection response coordination degree is as follows:
；
in the method, in the process of the application,for node i's degree of fit, +.>Is a line->Impedance of (c);
and the key node determining unit is used for calculating the attention degree of the target nodes in a weighted summation mode based on the aggregation degree, the protection response sensitivity, the protection response coordination degree and the weight coefficient so as to determine the key nodes by comparing the attention degrees of different target nodes.
9. The utility model provides a power grid relay protection setting key node screening terminal which characterized in that includes: a memory and a processor;
the memory is used for storing program codes, and the program codes correspond to a power grid relay protection setting key node screening method according to any one of claims 1 to 7;
the processor is configured to execute the program code.
10. A computer readable storage medium, wherein program code corresponding to a power grid relay protection setting key node screening method according to any one of claims 1 to 7 is stored in the computer readable storage medium.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2568663A1 (en) * | 2011-09-12 | 2013-03-13 | Honeywell International Inc. | Apparatus and method for identifying optimal node placement to form redundant paths around critical nodes and critical links in a multi-hop network |
| EP2568664A1 (en) * | 2011-09-12 | 2013-03-13 | Honeywell International Inc. | Apparatus and method for detecting critical nodes and critical links in a multi-hop network |
| CN105893740A (en) * | 2016-03-29 | 2016-08-24 | 中国人民解放军国防科学技术大学 | Method used for mining vulnerable node and circuit in power network |
| CN107482626A (en) * | 2017-08-17 | 2017-12-15 | 广东电网有限责任公司惠州供电局 | A kind of regional power grid key node recognition methods |
| CN110570016A (en) * | 2019-08-13 | 2019-12-13 | 浙江大学 | Disaster-resistant backbone net rack optimization method considering multi-stage performance |
| CN113095695A (en) * | 2021-04-20 | 2021-07-09 | 华北电力大学 | Power distribution network important node evaluation method considering power distribution network load characteristics and network topology characteristics |
-
2021
- 2021-11-19 CN CN202111416476.XA patent/CN114143204B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2568663A1 (en) * | 2011-09-12 | 2013-03-13 | Honeywell International Inc. | Apparatus and method for identifying optimal node placement to form redundant paths around critical nodes and critical links in a multi-hop network |
| EP2568664A1 (en) * | 2011-09-12 | 2013-03-13 | Honeywell International Inc. | Apparatus and method for detecting critical nodes and critical links in a multi-hop network |
| CN105893740A (en) * | 2016-03-29 | 2016-08-24 | 中国人民解放军国防科学技术大学 | Method used for mining vulnerable node and circuit in power network |
| CN107482626A (en) * | 2017-08-17 | 2017-12-15 | 广东电网有限责任公司惠州供电局 | A kind of regional power grid key node recognition methods |
| CN110570016A (en) * | 2019-08-13 | 2019-12-13 | 浙江大学 | Disaster-resistant backbone net rack optimization method considering multi-stage performance |
| CN113095695A (en) * | 2021-04-20 | 2021-07-09 | 华北电力大学 | Power distribution network important node evaluation method considering power distribution network load characteristics and network topology characteristics |
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