CN110932269A - Construction method, device and equipment of low-voltage distribution network - Google Patents
Construction method, device and equipment of low-voltage distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a construction method of a low-voltage distribution network, which is characterized in that a power failure frequency expectation and a power failure time expectation of each node are iterated according to a relation equation of the power failure frequency expectation and the power failure time expectation between a node positioned at the downstream and a node positioned at the upstream based on a preset power failure frequency expectation and a preset power failure time expectation of a first node (namely a transformer substation) of the low-voltage distribution network, and the low-voltage distribution network is constructed according to a topological structure of the low-voltage distribution network to be tested when the two indexes meet preset conditions, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability. The invention also discloses a device and equipment for constructing the low-voltage distribution network, and the device and equipment have the same beneficial effects as the method for constructing the low-voltage distribution network.
Description
Technical Field
The invention relates to the field of low-voltage power distribution networks, in particular to a construction method of a low-voltage power distribution network, and further relates to a construction device and equipment of the low-voltage power distribution network.
Background
The low-voltage distribution network belongs to a distribution network which is directly connected with a user in the distribution network, and the redundancy design is not provided, so that the reliability of the low-voltage distribution network is particularly important, but a mature construction method of the low-voltage distribution network is not provided in the prior art, and a worker usually and directly constructs the low-voltage distribution network according to a preset topological structure diagram of the low-voltage distribution network, so that the reliability of the low-voltage distribution network constructed in the way is not high generally, the power failure frequency of the user is high, and the power failure time is long.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a construction method of a low-voltage distribution network, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability; another object of the present invention is to provide a device and an apparatus for constructing a low voltage distribution network, so that the constructed low voltage distribution network has a low frequency and time of power failure and a high reliability.
In order to solve the technical problem, the invention provides a method for constructing a low-voltage distribution network, which comprises the following steps:
determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested;
iteratively calculating the power failure frequency expectation and the power failure time expectation of each node according to the upstream and downstream relation of each node, the preset power failure frequency expectation of a transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, and the power failure frequency expectation and the power failure time expectation between the node positioned at the downstream and the node positioned at the upstream;
and when the power failure frequency expectation and the power failure time expectation of each node meet preset conditions, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested.
Preferably, the determining the upstream-downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured specifically includes:
and determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested in the binary variable form.
Preferably, the determining the upstream-downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form specifically includes:
wherein B is a branch set, S represents a substation node,
and is
Indicating that node i is an upstream node of node j,
and is
Indicating that node i is a downstream node of node j and ij indicates a branch between node i and an adjacent node j.
Preferably, the iteratively calculating the outage frequency expectation and the outage time expectation of each node according to the relationship between the upstream and downstream of each node, the preset outage frequency expectation of the substation in the topology structure of the low-voltage distribution network to be measured, the preset outage time expectation of the substation, and the outage frequency expectation and the outage time expectation between the downstream node and the upstream node are specifically:
therein, IIiIndicating the expected frequency of power outage, l, at node iijDenotes the length, λ, of branch ijijIndicating the failure rate per unit length, λ, of branch ijiRepresenting the failure rate of the switch at node i;
wherein, gamma isjIndicating the expected blackout time of the j node, τijIndicating the time of a power failure, tau, due to a fault in branch ijiIndicating the time of a power failure due to a failure of switch i.
Preferably, the preset power failure frequency expectation and the preset power failure time expectation of the substation in the low-voltage distribution network topology structure to be tested are both zero.
Preferably, when the power failure frequency expectation and the power failure time expectation of each node satisfy preset conditions, the construction of the low-voltage distribution network according to the topology structure of the low-voltage distribution network to be tested specifically includes:
according to the power failure frequency expectation and the power failure time expectation of each node, calculating a reliability index of the topological structure of the low-voltage distribution network to be detected by combining a preset index calculation formula;
and when the reliability index of the topological structure of the low-voltage distribution network to be tested meets a preset standard, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested.
Preferably, the step of calculating the reliability index of the topology structure of the low-voltage distribution network to be measured by combining a preset index calculation formula according to the power failure frequency expectation and the power failure time expectation of each node specifically includes:
wherein SAIFI represents the average power failure frequency index of the system, SAIDI represents the systemAverage outage duration indicator, ASAI represents average system availability indicator, EENS represents average system outage expectation, Load represents Load node set, PiAnd the active load of the node i is represented, and the N represents the number of load nodes.
In order to solve the above technical problem, the present invention further provides a device for constructing a low voltage distribution network, including:
the determining module is used for determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be detected;
the first calculation module is used for calculating the power failure frequency expectation and the power failure time expectation of each node in an iterative manner according to the upstream and downstream relation of each node, the preset power failure frequency expectation of the transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, and the power failure frequency expectation and the power failure time expectation between the node positioned at the downstream and the node positioned at the upstream;
and the building module is used for building the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the power failure frequency expectation and the power failure time expectation of each node meet preset conditions.
Preferably, the building block comprises:
the second calculation module is used for calculating the reliability index of the topological structure of the low-voltage distribution network to be detected by combining a preset index calculation formula according to the power failure frequency expectation and the power failure time expectation of each node;
and the construction submodule is used for constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the reliability index of the topological structure of the low-voltage distribution network to be tested meets a preset standard.
In order to solve the above technical problem, the present invention further provides a device for constructing a low voltage distribution network, including:
a memory for storing a computer program;
a processor for implementing the steps of the method for constructing a low voltage distribution network as described in any one of the preceding claims when executing said computer program.
The invention provides a construction method of a low-voltage distribution network, which is characterized in that a power failure frequency expectation and a power failure time expectation of each node are iterated according to a relation equation of the power failure frequency expectation and the power failure time expectation between a node located at the downstream and a node located at the upstream based on a preset power failure frequency expectation and a preset power failure time expectation of a first node (namely a transformer substation) of the low-voltage distribution network, and the low-voltage distribution network is constructed according to a topological structure of the low-voltage distribution network to be tested when the two indexes meet preset conditions, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability.
The invention also provides a device and equipment for constructing the low-voltage distribution network, and the device and equipment have the same beneficial effects as the method for constructing the low-voltage distribution network.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for constructing a low-voltage distribution network according to the present invention;
fig. 2 is a logic structure diagram of a low voltage distribution network to be tested according to the present invention;
fig. 3 is a diagram of a connection model of components of a low-voltage distribution network to be tested according to the present invention;
fig. 4 is a schematic structural diagram of a construction apparatus of a low-voltage distribution network according to the present invention;
fig. 5 is a schematic structural diagram of a construction device of a low-voltage distribution network according to the present invention.
Detailed Description
The core of the invention is to provide a construction method of the low-voltage distribution network, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability; the other core of the invention is to provide a device and equipment for constructing the low-voltage distribution network, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for constructing a low voltage distribution network according to the present invention, including:
step S1: determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested;
specifically, due to the radial structure of the low-voltage distribution network and the arrangement of the switches, reliability parameters such as power failure frequency expectation and power failure time expectation between upstream and downstream nodes have a special linear relationship, and the power failure frequency expectation and the power failure time expectation of each node are solved based on the linear relationship between the upstream and downstream nodes in the embodiment of the invention, so that the upstream and downstream relationship of each node in the topology structure of the low-voltage distribution network to be detected can be determined firstly in the embodiment of the invention, and the subsequent calculation and use are facilitated.
The upstream-downstream relationship of each node may be the upstream-downstream relationship between every two adjacent nodes, for example, in two adjacent nodes AB, a is located upstream of B, and the like.
Step S2: iteratively calculating the power failure frequency expectation and the power failure time expectation of each node according to the upstream and downstream relation of each node, the preset power failure frequency expectation of a transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, the power failure frequency expectation between the downstream node and the upstream node and the relation equation of the power failure time expectation;
specifically, due to the radial structure of the low-voltage distribution network and the arrangement of the switches, reliability parameters such as the expected blackout frequency and the expected blackout time between the nodes at the upstream and downstream have a special linear relationship, so that a linear equation of the expected blackout frequency and the expected blackout time relationship of each point (that is, the "relational equation of the expected blackout frequency and the expected blackout time between the nodes at the downstream and the nodes at the upstream" mentioned in step S2) can be constructed by using the linear relationship, and since the preset expected blackout frequency and the preset expected blackout time of the first node (the substation) at the most upstream in the topology of the low-voltage distribution network are preset and set in the present application, based on the preset expected blackout frequency and the preset expected blackout time of the substation, the relational equation of the expected blackout frequency and the expected blackout time between the nodes at the downstream and the nodes at the upstream can be sequentially iterated The expected frequency of the power outage and the expected time of the power outage.
The preset blackout frequency expectation and the preset blackout time expectation of the substation may be set autonomously according to actual experience, for example, both may be set to 0, and the embodiments of the present invention are not limited herein.
In the iterative calculation process, because the transformer substation belongs to the first node in the low-voltage distribution network, and the preset power failure frequency expectation and the preset power failure time expectation are known conditions, the power failure frequency expectation and the power failure time expectation of the second node of the low-voltage distribution network at the downstream of the transformer substation can be determined according to the relational equation, and the power failure frequency expectation and the power failure time expectation of the third node and the fourth node … can be sequentially iterated in the same manner.
Step S3: and when the expected power failure frequency and the expected power failure time of each node meet preset conditions, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be detected.
Specifically, after the power failure frequency expectation and the power failure time expectation of each node are obtained, the reliability of the whole low-voltage distribution network can be described accordingly, and when the power failure frequency expectation and the power failure time expectation of each node meet preset conditions, the low-voltage distribution network corresponding to the topology structure of the low-voltage distribution network to be tested can be proved to have sufficient reliability, so that the low-voltage distribution network can be constructed according to the topology structure of the low-voltage distribution network to be tested.
The preset conditions may be of various types, for example, reliability indexes related to the power outage frequency expectation and the power outage time expectation of each node may be calculated according to the power outage frequency expectation and the power outage time expectation of each node, and then reliability of the topology structure of the low-voltage distribution network to be measured is evaluated according to the reliability indexes, and the like.
The invention provides a construction method of a low-voltage distribution network, which is characterized in that a power failure frequency expectation and a power failure time expectation of each node are iterated according to a relation equation of the power failure frequency expectation and the power failure time expectation between a node located at the downstream and a node located at the upstream based on a preset power failure frequency expectation and a preset power failure time expectation of a first node (namely a transformer substation) of the low-voltage distribution network, and the low-voltage distribution network is constructed according to a topological structure of the low-voltage distribution network to be tested when the two indexes meet preset conditions, so that the constructed low-voltage distribution network has lower power failure frequency and power failure time and higher reliability.
On the basis of the above-described embodiment:
as a preferred embodiment, the determining the upstream-downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured specifically includes:
and determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested in the binary variable form.
Specifically, the upstream and downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form is beneficial to the processor to identify and rapidly process.
As a preferred embodiment, the determining the upstream and downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form specifically includes:
wherein B is a branch set, S represents a substation node,
and is
Indicating that node i is an upstream node of node j,
and is
Indicating that node i is a downstream node of node j and ij indicates a branch between node i and an adjacent node j.
Specifically, the upstream and downstream relationship of the binary variable of each node can be determined quickly and accurately through the formula, and the upstream and downstream relationship can be determined through the formula
And is
Indicating that node i is an upstream node of node j,
and is
Indicating that node i is node jA downstream node.
In the embodiment of the invention, the upstream and downstream relations of the line, namely the relation of power flow, can be represented by one two subscript variables, so that a relation list can be avoided from being enumerated, a large amount of storage space is saved for computer calculation, retrieval operation is reduced, and the process of iterative calculation is accelerated.
Of course, in addition to the specific form of determining the upstream-downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form, the determination of the upstream-downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form may be performed in other manners, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, according to the upstream-downstream relationship of each node, the preset outage frequency expectation of the substation in the topology structure of the low-voltage distribution network to be measured, the preset outage time expectation of the substation, and the outage frequency expectation and outage time expectation between the downstream node and the upstream node, the iterative computation of the outage frequency expectation and the outage time expectation of each node specifically includes:
therein, IIiIndicating the expected frequency of power outage, l, at node iijDenotes the length, λ, of branch ijijIndicating the failure rate per unit length, λ, of branch ijiRepresenting the failure rate of the switch at node i;
wherein, gamma isjIndicating the expected blackout time of the j node, τijIndicating the time of a power failure, tau, due to a fault in branch ijiIndicating the time of a power failure due to a failure of switch i.
Specifically, compared with an upstream node, the power failure of the downstream node is caused by the faults of a line and a switch between two adjacent upstream and downstream nodes, so that in the relational equation, the downstream node has one more fault of the line and the switch than the upstream node, and according to the relational equation of the reliability element model connected in series, the power failure time of the downstream node is equal to the sum of the power failure time of the upstream node, the power failure time of the line between the two upstream and downstream nodes and the power failure time of the switch at the downstream node; the power failure frequency of the downstream node is equal to the sum of the power failure frequency of the upstream node, the power failure frequency of a line between the upstream node and the downstream node and the power failure frequency of a switch at the downstream node, and therefore the power failure frequency expectation and the power failure time expectation of each node can be iterated quickly and accurately.
In the embodiment of the present invention, a preset blackout frequency expectation and a preset blackout time expectation of the substation node may be specified, for example, both of the two expectations may be zero, and the embodiment of the present invention is not limited herein.
Of course, in addition to the above form, the blackout frequency expectation and the blackout time expectation of each node may be calculated iteratively according to the upstream and downstream relationship of each node, the preset blackout frequency expectation of the substation in the low-voltage distribution network topology structure to be measured, the preset blackout time expectation of the substation, and the relation equation of the blackout frequency expectation and the blackout time expectation between the downstream node and the upstream node, and may also be of various specific types, which is not limited herein in the embodiment of the present invention.
As a preferred embodiment, the preset power failure frequency expectation and the preset power failure time expectation of the substation in the low-voltage distribution network topology structure to be tested are both zero.
Specifically, in consideration of the importance of the transformer substation and the extremely low fault rate of the transformer substation, the preset power failure frequency expectation and the preset power failure time expectation of the transformer substation can be set to be zero in the embodiment of the invention, so that the calculated power failure frequency expectation of each node in the low-voltage distribution network is favorably improved to have the own power failure time expectation.
Of course, the preset power failure frequency expectation and the preset power failure time expectation of the substation in the low-voltage distribution network topology structure to be tested may also be other specific values, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, when the expected blackout frequency and the expected blackout time of each node satisfy preset conditions, the construction of the low-voltage distribution network according to the topology structure of the low-voltage distribution network to be measured specifically includes:
according to the power failure frequency expectation and the power failure time expectation of each node, calculating the reliability index of the topological structure of the low-voltage distribution network to be detected by combining a preset index calculation formula;
and when the reliability index of the topological structure of the low-voltage distribution network to be tested meets the preset standard, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested.
Specifically, the reliability index of the topological structure of the low-voltage distribution network to be tested can be more accurately described, and the reliability index is related to the power failure frequency expectation and the power failure time expectation, so that the reliability index of the topological structure of the low-voltage distribution network to be tested can be firstly calculated according to the power failure frequency expectation and the power failure time expectation, and then the low-voltage distribution network is constructed according to the topological structure of the low-voltage distribution network to be tested when the reliability index of the topological structure of the low-voltage distribution network to be tested meets the preset standard (for example, is greater than the preset threshold), and the low-voltage distribution network constructed in the way has higher reliability.
As a preferred embodiment, according to the expected power failure frequency and the expected power failure time of each node, the reliability index of the topology structure of the low-voltage distribution network to be measured is calculated by combining a preset index calculation formula, specifically:
wherein SAIFI represents a system average power failure frequency index, SAIDI represents a system average power failure duration index, ASAI represents an average system availability index, EENS represents a system average Load loss expectation, Load represents a Load node set, P representsiAnd the active load of the node i is represented, and the N represents the number of load nodes.
Specifically, the average system power failure frequency index, the average system power failure duration time, the system availability index and the average system load loss expectation can accurately and comprehensively describe the reliability of the low-voltage power distribution network to be detected from the overall perspective, and the reliability of the low-voltage power distribution network to be detected can be more accurately judged according to the four reliability indexes, so that the low-voltage power distribution network with higher reliability can be constructed.
Of course, besides the four reliability indexes, the reliability indexes may be of other types, and the embodiment of the present invention is not limited herein.
Specifically, a specific implementation manner given in the embodiment of the present invention is as follows:
(1) to facilitate description of the embodiment of the present invention, in the embodiment of the present invention, a structure diagram of a corresponding low-voltage distribution network line is established according to a topology structure of a low-voltage distribution network to be tested, as shown in fig. 2 and fig. 3, fig. 2 is a logic structure diagram of a low-voltage distribution network to be tested according to the present invention, fig. 3 is a component connection model diagram of a low-voltage distribution network to be tested according to the present invention, and fig. 2 corresponds to fig. 3 and includes a distribution substation node, a master switch, each stage of branch nodes, branch lines, and each stage of protection switches to a user equipment. Considering the line fault and the switch fault which have larger influence on the system, the connecting line is used for representing the line, and the switch is positioned at the upper end of the line according to the actual situation.
Fig. 2 and fig. 3 may help to understand the structure and the entire scheme of the power distribution network to be tested in the embodiment of the present invention, and the power distribution network may not be used in the computer processor.
In fig. 3, point 1 may represent a switching station distribution transformer and its switchgear, point 2 may represent a low-voltage distribution cabinet, points 3 and 4 may represent a distribution room in a building (with an air switch), points 5, 6 and 7 may represent an indoor distribution cabinet (with an air switch), and points 8, 9, 10 and 11 may represent a user equipment (with an air switch).
(2) The line information is stored as a backup in the form of the following tables, where table 1 is the number table of the distribution substation nodes and the load nodes, table 2 is the peak load table of each load node, table 3 is the basic information table of each branch, and table 4 is the basic information table of each switch:
TABLE 1
| |
1 |
| Load node | 8-11 |
TABLE 2
| Node point | Mean load (kW) |
| 8 | 1.5 |
| 9 | 1 |
| 10 | 1.4 |
| 11 | 1.8 |
TABLE 3
TABLE 4
| Node point | Failure rate (second time/year) | Repair time (times/hour) |
| 1 | 0.1 | 3 |
| 2 | 0.2 | 2 |
| 3 | 0.3 | 2 |
| 4 | 1 | 1 |
| 5 | 1.5 | 1 |
| 6 | 1 | 1 |
| 7 | 1.5 | 1 |
| 8 | 2 | 0.5 |
| 9 | 2.5 | 0.5 |
| 10 | 2 | 0.5 |
| 11 | 2.5 | 0.5 |
(3) The upstream and downstream relationship of each node is determined according to the method, as shown in table 5 below, table 5 is a comparison table of the upstream and downstream relationship of each node in the low-voltage distribution network to be measured.
TABLE 5
(4) According to the method, the power failure frequency expectation and the power failure time expectation of each node are determined, please refer to table 6 and table 7, table 6 is a power failure frequency expectation comparison table of each node in the low-voltage distribution network to be tested, and table 7 is a power failure time expectation comparison table of each node in the low-voltage distribution network to be tested.
TABLE 6
| Node point | Expected power failure frequency (times/years) |
| 1 | 0.1 |
| 2 | 0.39 |
| 3 | 0.77 |
| 4 | 1.53 |
| 5 | 2.39 |
| 6 | 1.83 |
| 7 | 3.07 |
| 8 | 4.49 |
| 9 | 4.4 |
| 10 | 3.88 |
| 11 | 5.66 |
TABLE 7
(5) And (4) calculating the reliability index according to the power failure frequency expectation and the power failure time expectation of each node obtained in the previous step, please refer to table 8, and table 8 is a reliability index comparison table of the low-voltage distribution network to be measured.
TABLE 8
| SAIFI (every household every year) | 4.6075 |
| SAIDI (annual per household per hour) | 4.8350 |
| ASAI | 0.999448 |
| EENS (kilowatt annually) | 22.9162 |
Specifically, the reliability of the low-voltage distribution network to be tested can be evaluated according to the finally calculated reliability index of the low-voltage distribution network to be tested.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a construction apparatus of a low voltage distribution network provided in the present invention, including:
the determining module 1 is used for determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be detected;
the first calculation module 2 is used for iteratively calculating the power failure frequency expectation and the power failure time expectation of each node according to the upstream and downstream relations of each node, the preset power failure frequency expectation of a transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, the power failure frequency expectation between the downstream node and the upstream node and the relation equation of the power failure time expectation;
and the building module 3 is used for building the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the expected power failure frequency and the expected power failure time of each node meet preset conditions.
As a preferred embodiment, the building block comprises:
the second calculation module is used for calculating the reliability index of the topological structure of the low-voltage distribution network to be measured by combining a preset index calculation formula according to the power failure frequency expectation and the power failure time expectation of each node;
and the construction submodule is used for constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the reliability index of the topological structure of the low-voltage distribution network to be tested meets the preset standard.
For the introduction of the device for constructing the low-voltage distribution network provided in the embodiment of the present invention, please refer to the embodiment of the method for constructing the low-voltage distribution network described above, which is not limited herein.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a construction apparatus of a low voltage distribution network provided in the present invention, including:
a memory 4 for storing a computer program;
a processor 5, configured to implement the steps of the method for constructing a low voltage distribution network as described above when executing a computer program.
For the introduction of the construction apparatus of the low-voltage distribution network provided in the embodiment of the present invention, please refer to the embodiment of the construction method of the low-voltage distribution network, which is not limited herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for constructing a low-voltage distribution network, comprising:
determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested;
iteratively calculating the power failure frequency expectation and the power failure time expectation of each node according to the upstream and downstream relation of each node, the preset power failure frequency expectation of a transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, and the power failure frequency expectation and the power failure time expectation between the node positioned at the downstream and the node positioned at the upstream;
and when the power failure frequency expectation and the power failure time expectation of each node meet preset conditions, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested.
2. The method for constructing the low-voltage distribution network according to claim 1, wherein the determining of the upstream and downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured is specifically as follows:
and determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be tested in the binary variable form.
3. The method for constructing the low-voltage distribution network according to claim 2, wherein the determining of the upstream and downstream relationship of each node in the topology structure of the low-voltage distribution network to be measured in the binary variable form is specifically:
wherein B is a branch set, S represents a substation node,
and is
Indicating that node i is an upstream node of node j,
and is
Indicating that node i is a downstream node of node j and ij indicates a branch between node i and an adjacent node j.
4. The method according to claim 3, wherein the iteratively calculating the outage frequency expectation and the outage time expectation of each node according to the upstream and downstream relationship of each node, the preset outage frequency expectation of the substation in the topology structure of the low-voltage distribution network to be tested, the preset outage time expectation of the substation, and the outage frequency expectation and the outage time expectation between the downstream node and the upstream node is specifically:
therein, IIiIndicating the expected frequency of power outage, l, at node iijDenotes the length, λ, of branch ijijIndicating the failure rate per unit length, λ, of branch ijiRepresenting the failure rate of the switch at node i;
wherein, gamma isjIndicating the expected blackout time of the j node, τijIndicating the time of a power failure, tau, due to a fault in branch ijiIndicating the time of a power failure due to a failure of switch i.
5. The method according to claim 4, wherein the preset blackout frequency expectation and the preset blackout time expectation of the substation in the topological structure of the low-voltage distribution network to be tested are both zero.
6. The method according to any one of claims 1 to 5, wherein when the power outage frequency expectation and the power outage time expectation of each node satisfy preset conditions, the constructing of the low-voltage distribution network according to the topology structure of the low-voltage distribution network to be tested specifically includes:
according to the power failure frequency expectation and the power failure time expectation of each node, calculating a reliability index of the topological structure of the low-voltage distribution network to be detected by combining a preset index calculation formula;
and when the reliability index of the topological structure of the low-voltage distribution network to be tested meets a preset standard, constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested.
7. The method according to claim 6, wherein the step of calculating the reliability index of the topological structure of the low-voltage distribution network to be measured by combining a preset index calculation formula according to the power outage frequency expectation and the power outage time expectation of each node is specifically as follows:
wherein SAIFI represents a system average power failure frequency index, SAIDI represents a system average power failure duration index, ASAI represents an average system availability index, EENS represents a system average Load loss expectation, Load represents a Load node set, P representsiAnd the active load of the node i is represented, and the N represents the number of load nodes.
8. A device for constructing a low-voltage distribution network, comprising:
the determining module is used for determining the upstream and downstream relation of each node in the topological structure of the low-voltage distribution network to be detected;
the first calculation module is used for calculating the power failure frequency expectation and the power failure time expectation of each node in an iterative manner according to the upstream and downstream relation of each node, the preset power failure frequency expectation of the transformer substation in the topological structure of the low-voltage distribution network to be detected, the preset power failure time expectation of the transformer substation, and the power failure frequency expectation and the power failure time expectation between the node positioned at the downstream and the node positioned at the upstream;
and the building module is used for building the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the power failure frequency expectation and the power failure time expectation of each node meet preset conditions.
9. The building device of the low-voltage distribution network according to claim 8, wherein the building module comprises:
the second calculation module is used for calculating the reliability index of the topological structure of the low-voltage distribution network to be detected by combining a preset index calculation formula according to the power failure frequency expectation and the power failure time expectation of each node;
and the construction submodule is used for constructing the low-voltage distribution network according to the topological structure of the low-voltage distribution network to be tested when the reliability index of the topological structure of the low-voltage distribution network to be tested meets a preset standard.
10. Construction equipment for low-voltage distribution networks, characterized in that it comprises:
a memory for storing a computer program;
a processor for implementing the steps of the method of constructing a low voltage distribution network according to any one of claims 1 to 7 when executing said computer program.
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