CN114418237A - Distribution network power supply safety capability evaluation standard quantification method, system, equipment and medium - Google Patents
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Abstract
The invention discloses a method, a system, equipment and a medium for quantifying evaluation criteria of distribution network power supply safety capacity, wherein the method comprises the following steps: carrying out local topology on a feeder line group of a distribution network, and respectively carrying out grid analysis on each feeder line of the feeder line group; calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the greatest influence, and the fault occurrence probability of the line section of the weakest link of each feeder line; determining the grid frame reference risk level corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk levels; evaluating the power supply safety capability of the distribution network according to the network frame reference risk level of the feeder group; according to the invention, by establishing the distribution network power supply safety standard which is matched with the super-huge urban distribution network, a user can conveniently and intuitively know the power supply safety capability of the feeder line.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method, a system, equipment and a medium for quantifying an evaluation standard of distribution network power supply safety capability.
Background
Along with the continuous improvement of urbanization, the scale of a power grid is continuously increased, the types and the number of power equipment are more and more, certain difference exists between the distribution network grid planning standard of a plurality of cities and the power supply safety requirement of a large urban power grid system, the existing distribution network power supply safety standard is not matched with or matched with the urban power distribution network, the power supply safety capability evaluation of distribution networks in different areas is not accurate and is not practical, so that the distribution network power supply safety standard matched with an extra-large urban power distribution network needs to be researched and established, the power supply safety capability analysis method for researching the operation of the distribution network is used for improving the professional analysis breadth and depth of the operation mode of the distribution network system, and the participation degree of the distribution network grid structure planning is enhanced, so that the safety, reliability, economy and high-quality operation of the distribution network are guaranteed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quantifying the evaluation standard of the power supply safety capability of a distribution network.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a distribution network power supply safety capability evaluation standard quantification method comprises the following steps:
s1, carrying out local topology on feeder groups of a distribution network, and carrying out grid analysis on each feeder of the feeder groups respectively;
s2, calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which cause the maximum influence after each feeder line passes through a corresponding complex power means under the condition of N-1 and the fault occurrence probability of the line section of the worst weak link of each feeder line;
s3, determining net rack reference risk levels corresponding to the feeders of the feeder group according to preset corresponding relations between different reference risk value ranges and different net rack reference risk levels;
and S4, evaluating the power supply safety capability of the distribution network according to the grid benchmark risk level corresponding to each feeder of the feeder group.
Further, the step S1 includes:
local topology is carried out on a feeder line group of a distribution network by adopting a single feeder line xml model file, and net rack analysis is carried out on each feeder line of the feeder line group respectively to obtain complete topology information corresponding to each feeder line of the feeder line group.
Further, the step S2 includes:
according to the number of medium-voltage users, the maximum number of low-voltage users, the maximum load number and the fault occurrence probability of the line section of the most serious weak link which have the greatest influence on the area where each feeder is located, the reference risk value E of each feeder net rack problem is calculatediEvaluation was carried out, the calculation formula of which is as follows:
wherein Z isb、Db、FbRespectively providing medium-voltage user data, low-voltage user number and load number reference values which are allowed to be influenced by the feeder line in a preset distribution network feeder line power supply safety capability standard table; zi、Di、FiThe number of medium-voltage users, the number of low-voltage users and the load value which are the maximum influence caused by a corresponding power recovery means under the condition that any element of the feeder line has a fault are respectively set; giThe fault probability of the line section of the most serious weak link of the feeder line is obtained.
Further, if the line section with the most serious weak link is in a house or a cable, the fault occurrence probability is 0.8; if the line section of the most serious weak link is a short overhead line, namely the line length is less than 1km, the fault occurrence probability is 1.0; if the most serious weak link line section is a long overhead line, namely the line length is more than 1km, the fault occurrence probability is 1.2.
Further, the distribution network feeder is a 10kV feeder.
Further, the step S3 includes:
and pre-setting a plurality of levels of net rack reference risk levels according to different reference risk value ranges, and then determining the net rack reference risk level according to the reference risk value range to which the reference risk value corresponding to the feeder line belongs.
Further, the evaluating the power supply safety capability of the distribution network according to the grid frame benchmark risk level of the feeder group further comprises:
and evaluating the distribution network power supply safety capacity of a first preset time period, a second preset time period and a third preset time period after each feeder N-1.
In order to achieve the above object, the present invention further provides a system for quantifying evaluation criteria of distribution network power supply safety capability, which is used in the above method, and includes:
the feeder analysis module is used for carrying out local topology on a feeder group of a distribution network and carrying out grid analysis on each feeder of the feeder group;
the risk calculation module is used for calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the largest influence, and the fault occurrence probability of the line section of the worst weak link of each feeder line;
the grade determination module is used for determining the net rack reference risk grade corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different net rack reference risk grades;
and the safety evaluation module is used for evaluating the power supply safety capability of the distribution network according to the grid frame benchmark risk level of the feeder group.
To achieve the above object, the present invention additionally provides a computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the above method when executing the computer program.
To achieve the above object, the present invention additionally provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the above method.
Compared with the prior art, the technical scheme has the following principles and advantages:
according to the technical scheme, the feeder line group of the distribution network is subjected to local topology, and each feeder line of the feeder line group is subjected to grid analysis; calculating a reference risk value corresponding to each feeder line according to the number of the medium-voltage users, the number of the low-voltage users and the load value which are possibly caused by the feeder lines after passing through the corresponding power recovery means under the condition of N-1 and the fault occurrence probability of the line section of the weakest link of each feeder line; determining the grid frame reference risk level corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk levels; evaluating the power supply safety capability of the distribution network according to the network frame reference risk level of the feeder group; the distribution network power supply safety standard which is matched with the super-huge urban distribution network is established, the professional analysis breadth and depth of the operation mode of the distribution network system are improved, the participation degree of the distribution network grid structure planning is enhanced, the safe, reliable, economic and high-quality operation of the distribution network is guaranteed, and the user can know the feeder line power supply safety capability more visually.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the services required for the embodiments or the technical solutions in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for quantifying evaluation criteria of distribution network power supply safety capability according to an embodiment of the present invention;
fig. 2 is a connection block diagram of a system for quantifying evaluation criteria of distribution network power supply safety capability according to an embodiment of the present invention;
fig. 3 is an internal structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific embodiments:
as shown in fig. 1, the method for quantifying the evaluation criterion of the distribution network power supply safety capability according to this embodiment includes the following steps:
s1, carrying out local topology on feeder groups of a distribution network, and carrying out grid analysis on each feeder of the feeder groups respectively;
s2, calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which cause the maximum influence after each feeder line passes through a corresponding complex power means under the condition of N-1 and the fault occurrence probability of the line section of the worst weak link of each feeder line;
s3, determining net rack reference risk levels corresponding to the feeders of the feeder group according to preset corresponding relations between different reference risk value ranges and different net rack reference risk levels;
and S4, evaluating the power supply safety capability of the distribution network according to the grid benchmark risk level corresponding to each feeder of the feeder group.
Specifically, the method and the device aim at a distribution network model and analyze according to feeder groups of a distribution network. And evaluating the reference risk value of the feeder line net rack problem from five dimensions, namely the number of the medium-voltage users, the number of the maximum low-voltage users, the maximum load number, the fault probability and the like which are possibly influenced by the area where the feeder line is located. And then, according to the corresponding relation between the different reference risk value ranges and the different net rack reference risk levels, the net rack reference risk level corresponding to each feeder line can be determined, so that the power supply safety capability of the distribution network is evaluated. Preferably, various mining statistics and automatic mapping display can be carried out on the analysis result, so that a user can know the safe power supply capacity of the distribution network at a glance.
According to the invention, the local topology is carried out on the feeder line group of the distribution network, and the grid analysis is respectively carried out on each feeder line of the feeder line group; calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the greatest influence, and the fault occurrence probability of the line section of the weakest link of each feeder line; determining the grid frame reference risk level corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk levels; evaluating the power supply safety capability of the distribution network according to the network frame reference risk level of the feeder group; the distribution network power supply safety standard which is matched with the super-huge urban distribution network is established, the professional analysis breadth and depth of the operation mode of the distribution network system are improved, the participation degree of the distribution network grid structure planning is enhanced, the safe, reliable, economic and high-quality operation of the distribution network is guaranteed, and a user can know the feeder line power supply safety capability more visually.
In an embodiment, the performing a local topology on feeder groups of a distribution network, and performing a grid analysis on each feeder of the feeder groups respectively includes:
and analyzing the single feeder xml model file provided by the GIS system to obtain complete topology information corresponding to each feeder of the feeder group.
In particular, the present invention performs rack analysis on feeder units, each time depending on local topology (i.e., for a single feeder) rather than global topology (the entire distribution network). In practical application, a single feeder xml model file provided by a GIS system describes complete topology information of a feeder, the invention can adopt the single feeder xml model file to carry out local topology on a feeder group of a distribution network, and carry out grid analysis on each feeder of the feeder group; the efficiency is extremely high, and the processing speed is high.
In an embodiment, the reference risk value corresponding to each feeder line is calculated according to the number of medium-voltage users, the number of low-voltage users, the load value and the fault occurrence probability of the line section of the weakest link of each feeder line, which are caused by the feeder line passing through the corresponding complex power means under the condition of N-1, and the calculation formula is as follows:
wherein Z isb、Db、FbRespectively providing medium-voltage user data, low-voltage user number and load number reference values which are allowed to be influenced by the feeder line in a preset distribution network feeder line power supply safety capability standard table; zi、Di、FiThe number of medium-voltage users, the number of low-voltage users and the load value which are the maximum influence caused by a corresponding power recovery means under the condition that any element of the feeder line has a fault are respectively set; giThe fault probability of the line section of the most serious weak link of the feeder line is obtained.
In one embodiment, if the most severe weak link line section is in a house or a cable, the probability of failure occurrence is 0.8; if the line section of the most serious weak link is a short overhead line, namely the line length is less than 1km, the fault occurrence probability is 1.0; if the most serious weak link line section is a long overhead line, namely the line length is more than 1km, the fault occurrence probability is 1.2.
In one embodiment, the evaluating the distribution network power supply safety capability according to the rack benchmark risk level of the feeder group further includes:
and evaluating the distribution network power supply safety capacity of a first preset time period, a second preset time period and a third preset time period after each feeder N-1.
In one embodiment, the distribution network feeder is a 10kV feeder.
The distribution network feeder is taken as a 10kV feeder, and the detailed description is as follows: the distribution network complex power capacity of the 10kV feeder line N-1 in 180 seconds, 15 minutes and 3 hours is analyzed, namely the first preset time period, the second preset time period and the third preset time period are respectively 180 seconds, 15 minutes and 3 hours. From the area of the 10kV feeder line, five dimensions which may influence the maximum number of medium-voltage users, the maximum number of low-voltage users, the maximum load number, the fault probability and the like, the reference risk value E of the feeder line grid structure problemiEvaluation was carried out, the calculation formula of which is as follows:
description of the parameters: zb、Db、FbThe method comprises the steps of providing medium-voltage user data, the number of low-voltage users and a load number reference value which are allowed to be influenced by a 10kV feeder line in a preset distribution network 10kV feeder line power supply safety capability standard table. Zi、Di、FiThe device is the medium-voltage user number, the low-voltage user number and the load numerical value which are the maximum influences caused by a corresponding power recovery means under the condition that any element of 10kV has a fault. GiThe fault occurrence probability of the line section of the worst weak link of a 10kV feeder line is 0.8 for an indoor fault and a cable fault, 1.0 for a short overhead line fault (the line length is less than 1km) and 1.2 for a long overhead line fault (the line length is more than 1 km). The distribution network 10kV feeder line power supply safety capability standard table is a suitable distribution network subarea power supply safety capability standard which is established by combining distribution network operation actual conditions, domestic and foreign power supply safety standards and the like.
The method analyzes the number of users, the number of loads and the importance degree of the loads which are influenced by the maximum power failure range of the 10kV feeder line after the 10kV feeder line is subjected to measures such as distribution network self-healing, dispatching remote control, field operation and the like within a specific time period (second level, minute level and hour level) after an N-1/N-1-1 fault or planned outage occurs. Furthermore, various mining statistics and automatic mapping display can be carried out on the analysis result.
In an embodiment, the determining, according to preset correspondence between different reference risk value ranges and different rack reference risk levels, a rack reference risk level corresponding to each feeder line includes:
setting five levels of net rack reference risk levels in advance according to different reference risk value ranges;
and determining the grid frame reference risk level according to the reference risk value range to which the reference risk value corresponding to the feeder line belongs.
Specifically, the reference risk value E if feeder grid problems occuriIf the risk is more than or equal to 300, the risk is the primary net rack reference risk level and is correspondingly classified as a primary net rack risk question bank; reference risk value E if feeder net rack problemiLess than 300 and greater than or equal to 150, thenThe reference risk grade of the secondary net rack is correspondingly classified into a secondary net rack risk question library; reference risk value E if feeder net rack problemiIf the risk is less than 150 and greater than or equal to 100, the risk is the reference risk grade of the three-level net rack and the risk is correspondingly classified into a three-level net rack risk question bank; reference risk value E if feeder net rack problemiIf the risk is less than 100 and greater than or equal to 50, the risk is a four-level net rack reference risk level and is correspondingly classified as a four-level net rack risk question bank; reference risk value E if feeder net rack problemiAnd if the risk is less than 50, the risk is the five-level net rack reference risk level and is correspondingly classified as a five-level net rack risk question bank. Therefore, the user can correspondingly modify the emergency degree according to the risk level assessment.
The method measures and calculates the power supply safety capability of the feeder line, and brings the feeder line, the bus and the transformer substation which do not meet the power supply safety capability standard of the distribution network into a feeder line or main distribution cooperative network frame weak link problem library. And outputting the I-to-V-level reference risk of the line foundation/three-remote network frame and the I-to-V-level reference risk of the main distribution cooperative foundation/three-remote network frame in a grading manner according to the risk value of the distribution network frame and the accident event condition, thereby providing a basis for distribution network planning and operation.
In summary, the quantitative modeling method for the evaluation standard of the power supply safety capability of the distribution network, provided by the invention, is used for carrying out local topology on the feeder line group of the distribution network and respectively carrying out grid analysis on each feeder line of the feeder line group; calculating a reference risk value corresponding to each feeder line according to the number of the medium-voltage users, the number of the low-voltage users and the load value which are possibly caused by the feeder lines after passing through the corresponding power recovery means under the condition of N-1 and the fault occurrence probability of the line section of the weakest link of each feeder line; determining the grid frame reference risk level corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk levels; evaluating the power supply safety capability of the distribution network according to the network frame reference risk level of the feeder group; the distribution network power supply safety standard which is matched with the super-huge urban distribution network is established, the professional analysis breadth and depth of the operation mode of the distribution network system are improved, the participation degree of the distribution network grid structure planning is enhanced, the safe, reliable, economic and high-quality operation of the distribution network is guaranteed, and a user can know the feeder line power supply safety capability more visually. The evaluation standard covers distribution networks, various recovery timeliness (second level, minute level and hour level) and various assessment results (load loss rate, distribution transformer loss rate and user loss rate). The evaluation rule can be quantized into specific records and stored in a database table; so as to carry out the work of maintaining and showing the evaluation standard, verifying whether the evaluation standard is met, and the like.
As shown in fig. 2, the present invention further provides a system for quantifying evaluation criteria of distribution network power supply safety capability, including:
the feeder analysis module 1 is used for performing local topology on a feeder group of a distribution network and performing grid analysis on each feeder of the feeder group;
the risk calculation module 2 is used for calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the largest influence, and the fault occurrence probability of the line section of the worst weak link of each feeder line;
the grade determining module 3 is used for determining the grid frame reference risk grade corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk grades;
and the safety evaluation module 4 is used for evaluating the power supply safety capability of the distribution network according to the grid frame benchmark risk level of the feeder group.
For specific limitations of the system for quantifying the evaluation criteria of the distribution network power supply safety capability, reference may be made to the above limitations of the method for quantifying the evaluation criteria of the distribution network power supply safety capability, which are not described herein again. All modules in the distribution network power supply safety capability evaluation standard quantification system can be completely or partially realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 3. The computer device includes a processor a01, a network interface a02, a memory (not shown), and a database (not shown) connected by a system bus. Wherein processor a01 of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises an internal memory a03 and a non-volatile storage medium a 04. The non-volatile storage medium a04 stores an operating system B01, a computer program B02, and a database (not shown in the figure). The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a 04. The database of the computer equipment is used for storing the advertisement pictures and the parameters and other data of the advertisement pictures. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program B02 is executed by the processor A01 to implement a method for quantifying evaluation criteria of distribution network power supply safety capability.
Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program: carrying out local topology on a feeder line group of a distribution network, and respectively carrying out grid analysis on each feeder line of the feeder line group; calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the greatest influence, and the fault occurrence probability of the line section of the weakest link of each feeder line; determining the grid frame reference risk level corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different grid frame reference risk levels; and evaluating the power supply safety capability of the distribution network according to the network frame reference risk level of the feeder group.
In an embodiment, the performing a local topology on feeder groups of a distribution network, and performing a grid analysis on each feeder of the feeder groups respectively includes:
and analyzing the single feeder xml model file provided by the GIS system to obtain complete topology information corresponding to each feeder of the feeder group.
In an embodiment, the calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users, and the load value, which are caused by the feeder line through a corresponding complex power means under the condition of N-1 and have the largest influence, and the probability of occurrence of a fault in the line section of the weakest link of each feeder line includes:
according to the number of medium-voltage users, the maximum number of low-voltage users, the maximum load number and the fault occurrence probability of the line section of the most serious weak link which have the greatest influence on the area where each feeder is located, the reference risk value E of each feeder net rack problem is calculatediEvaluation was carried out, the calculation formula of which is as follows:
wherein Z isb、Db、FbRespectively providing medium-voltage user data, low-voltage user number and load number reference values which are allowed to be influenced by the feeder line in a preset distribution network feeder line power supply safety capability standard table; zi、Di、FiThe number of medium-voltage users, the number of low-voltage users and the load value which are the maximum influence caused by a corresponding power recovery means under the condition that any element of the feeder line has a fault are respectively set; giThe fault probability of the line section of the most serious weak link of the feeder line is obtained.
In one embodiment, if the most severe weak link line section is in a house or a cable, the probability of failure occurrence is 0.8; if the line section of the most serious weak link is a short overhead line, namely the line length is less than 1km, the fault occurrence probability is 1.0; if the most serious weak link line section is a long overhead line, namely the line length is more than 1km, the fault occurrence probability is 1.2.
In one embodiment, the distribution network feeder is a 10kV feeder.
In an embodiment, the determining, according to preset correspondence between different reference risk value ranges and different rack reference risk levels, a rack reference risk level corresponding to each feeder line includes:
setting five levels of net rack reference risk levels in advance according to different reference risk value ranges;
and determining the grid frame reference risk level according to the reference risk value range to which the reference risk value corresponding to the feeder line belongs.
In one embodiment, the evaluating the distribution network power supply safety capability according to the rack benchmark risk level of the feeder group further includes:
and evaluating the distribution network power supply safety capacity of a first preset time period, a second preset time period and a third preset time period after each feeder N-1.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the steps of the above-described distribution network power supply safety capability evaluation criterion quantitative modeling method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (10)
1. The method for quantifying the evaluation standard of the power supply safety capability of the distribution network is characterized by comprising the following steps of:
s1, carrying out local topology on feeder groups of a distribution network, and carrying out grid analysis on each feeder of the feeder groups respectively;
s2, calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which cause the maximum influence after each feeder line passes through a corresponding complex power means under the condition of N-1 and the fault occurrence probability of the line section of the worst weak link of each feeder line;
s3, determining net rack reference risk levels corresponding to the feeders of the feeder group according to preset corresponding relations between different reference risk value ranges and different net rack reference risk levels;
and S4, evaluating the power supply safety capability of the distribution network according to the grid benchmark risk level corresponding to each feeder of the feeder group.
2. The method for quantifying evaluation criteria of distribution network power supply safety capability of claim 1, wherein the step S1 comprises:
local topology is carried out on a feeder line group of a distribution network by adopting a single feeder line xml model file, and net rack analysis is carried out on each feeder line of the feeder line group respectively to obtain complete topology information corresponding to each feeder line of the feeder line group.
3. The method for quantifying evaluation criteria of distribution network power supply safety capability of claim 1, wherein the step S2 comprises:
according to the number of medium-voltage users, the maximum number of low-voltage users, the maximum load number and the fault occurrence probability of the line section of the most serious weak link which have the greatest influence on the area where each feeder is located, the reference risk value E of each feeder net rack problem is calculatediEvaluation was carried out, the calculation formula of which is as follows:
wherein Z isb、Db、FbRespectively providing medium-voltage user data, low-voltage user number and load number reference values which are allowed to be influenced by the feeder line in a preset distribution network feeder line power supply safety capability standard table; zi、Di、FiThe number of medium-voltage users, the number of low-voltage users and the load value which are the maximum influence caused by a corresponding power recovery means under the condition that any element of the feeder line has a fault are respectively set; giThe fault probability of the line section of the most serious weak link of the feeder line is obtained.
4. The distribution network power supply safety capability evaluation standard quantification method according to claim 3 is characterized in that if the most serious weak link line section is an indoor or cable, the fault occurrence probability is 0.8; if the line section of the most serious weak link is a short overhead line, namely the line length is less than 1km, the fault occurrence probability is 1.0; if the most serious weak link line section is a long overhead line, namely the line length is more than 1km, the fault occurrence probability is 1.2.
5. The distribution network power supply safety capability evaluation standard quantification method of claim 3, wherein a distribution network feeder is a 10kV feeder.
6. The method for quantifying evaluation criteria of distribution network power supply safety capability of claim 1, wherein the step S3 comprises:
and pre-setting a plurality of levels of net rack reference risk levels according to different reference risk value ranges, and then determining the net rack reference risk level according to the reference risk value range to which the reference risk value corresponding to the feeder line belongs.
7. The method for quantifying evaluation criteria for distribution network power supply safety capabilities of claim 1, wherein the evaluating the distribution network power supply safety capabilities according to the grid frame benchmark risk level of the feeder group further comprises:
and evaluating the distribution network power supply safety capacity of a first preset time period, a second preset time period and a third preset time period after each feeder N-1.
8. The utility model provides a join in marriage net power supply safety ability evaluation standard quantization system which characterized in that includes:
the feeder analysis module is used for carrying out local topology on a feeder group of a distribution network and carrying out grid analysis on each feeder of the feeder group;
the risk calculation module is used for calculating a reference risk value corresponding to each feeder line according to the number of medium-voltage users, the number of low-voltage users and the load value which are caused by the feeder lines in the N-1 condition through a corresponding power restoration means and have the largest influence, and the fault occurrence probability of the line section of the worst weak link of each feeder line;
the grade determination module is used for determining the net rack reference risk grade corresponding to each feeder line according to the preset corresponding relation between different reference risk value ranges and different net rack reference risk grades;
and the safety evaluation module is used for evaluating the power supply safety capability of the distribution network according to the grid frame benchmark risk level of the feeder group.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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