CN-121051916-B - Intelligent distribution method and system for overhead line switches of power distribution network

CN121051916BCN 121051916 BCN121051916 BCN 121051916BCN-121051916-B

Abstract

The invention discloses an intelligent distribution method and system for a power distribution network overhead line switch, wherein the method comprises the steps of judging whether a branch line connected with a 10kV line to be modified is a large branch or not by adopting a preset branch judgment strategy according to a power supply area, the length of the branch line, the quantity of distribution transformers and the capacity of the distribution transformers; if all branch lines connected with the 10kV line to be modified are not large branches, splitting each branch line to obtain at least one single-radiation-shaped sub-line, dividing a certain single-radiation-shaped sub-line according to a preset self-adaptive load balancing strategy to obtain at least one sub-line section distribution scheme corresponding to the certain single-radiation-shaped sub-line, calculating the scheme reliability of the at least one sub-line section distribution scheme, and selecting a target sub-line section distribution scheme corresponding to the maximum scheme reliability. The problems that the switch common-tripping influences the power supply reliability and the electric quantity loss caused by unreasonable layout of the large branch switch and the sectional switch are avoided as far as possible.

Inventors

YUAN LE
DENG CAIBO
LI SHENGJIAN
GUO LIANG
LIU YANG
CAO JUNYING
YANG YUHANG

Assignees

国网江西省电力有限公司电力科学研究院

Dates

Publication Date: 20260508
Application Date: 20251031

Claims (8)

1. An intelligent distribution method for power distribution network overhead line switches is characterized by comprising the following steps: Acquiring the power supply area, the length of a branch line and the distribution variable number and the distribution variable capacity of a connecting strip of a 10kV line to be modified; Judging whether the branch line connected with the 10kV line to be modified is a large branch or not by adopting a preset branch judgment strategy according to the power supply area, the length of the branch line, the distribution quantity and the distribution capacity; If all branch lines connected with the 10kV line to be modified are not large branches, splitting all branch lines to obtain at least one single-radiation-shaped sub-line; dividing a certain single-radiation-shaped sub-line according to a preset self-adaptive load balancing strategy to obtain at least one sub-line section allocation scheme corresponding to the certain single-radiation-shaped sub-line, wherein the expression of the self-adaptive load balancing strategy is as follows: , , , , , in the formula, In order to simultaneously consider the sum of the minimized absolute errors of the impedance distribution and the distribution transformer capacity distribution of each sub-line section of the 10kV line to be modified, The distribution capacity of the connection band of the kth line sub-line, For the distribution of the 10kV line splicing tapes to be modified, The total capacity of the distribution transformer for the 10kV line connecting belt to be modified, For the purpose of distributing the capacity equalization coefficient of the transformer, Is the equivalent impedance of the kth line sub-line, For the total impedance of the 10kV line to be retrofitted, For the average impedance of the 10kV line to be retrofitted, As the impedance equalization coefficient, the impedance of the sample, The number of sub-line sections; Calculating the scheme reliability of the at least one sub-line section distribution scheme, and selecting a target sub-line section distribution scheme corresponding to the maximum scheme reliability; setting a switch at the head end of each target sub-line section in the target sub-line section distribution scheme, and judging whether the distance between a first switch and a second switch is larger than a preset distance threshold value, wherein the first switch and the second switch are two adjacent switches, and the distance between the second switch and a power supply end is larger than the distance between the first switch and the power supply end; And if the distance is greater than the preset distance threshold, outputting the switch positions installed at the head ends of the target sub-line sections, namely a final switch intelligent layout scheme.
2. The intelligent distribution network overhead line switch layout method according to claim 1, wherein the expression of the branch determination strategy is: , Wherein C, D, E is a C-type power supply area, a D-type power supply area and an E-type power supply area respectively, The distribution capacity of the 10kV line connecting band to be modified, For the length of the branch line, The number of high-voltage users for the branch line; after judging whether the branch line connected with the 10kV line to be rebuilt is a big branch or not by adopting a preset branch judgment strategy, the method further comprises the following steps: if a branch line is a large branch line, a switch is automatically added at the head end of the branch line, and the branch line is eliminated.
3. The intelligent distribution network overhead line switch layout method according to claim 1, wherein the dividing a single radial sub-line according to a preset adaptive load balancing strategy to obtain at least one sub-line section allocation scheme corresponding to the single radial sub-line comprises: Dividing the certain single-radiation-type sub-line to obtain at least one sub-line section dividing scheme, wherein one sub-line section dividing scheme comprises the number of divided sub-line sections; Calculating a first ratio of the total distribution capacity of the connecting strip in the 10kV line to be modified to the number of sub-line sections to obtain the average distribution capacity of the connecting strip of the 10kV line to be modified, and calculating a second ratio of the total impedance of the 10kV line to be modified to the number of sub-line sections to obtain the average impedance of the 10kV line to be modified; The method comprises the steps of making a difference between equivalent impedance in each sub-line section in a certain sub-line section dividing scheme and average impedance of a 10kV line to be modified, making a difference between distribution transformation capacity of each sub-line section connecting band and distribution average capacity of the 10kV line connecting band to be modified, and summing up difference results to obtain absolute deviation sum of impedance distribution and distribution transformation capacity distribution corresponding to the certain sub-line section dividing scheme; And selecting at least one sub-line section dividing scheme corresponding to the minimum absolute deviation sum, and obtaining at least one sub-line section distributing scheme corresponding to the certain single-radiation-shaped sub-line.
4. The intelligent distribution network overhead line switch layout method according to claim 1, wherein the expression for calculating the scheme reliability of the at least one sub-line segment allocation scheme is: , , , , , , , , in the formula, 、、 The power supply reliability, the transformation cost and the loss electric quantity weight in the layout scheme reliability calculation formula are respectively calculated, In order to reduce the power consumption lost after the transformation compared with each fault before the transformation, In order to average loss of electricity charge per fault after transformation, To simulate the average power loss charge generated by faults before the transformation of the 10kV line to be transformed, The sum of the lost power for all segments, In order to influence the number of the houses when the power failure occurs, In order to simulate the total number of faults, The number of faults is simulated for the kth segment, The power is lost for the k-th section power outage, The capacity of the transfer section is allocated to the transfer section, The capacity of the transformer is allocated for the fault section, For the total number of the distribution transformers of the 10kV line connection belt to be modified, For the number of time units affected by the k-th section power outage, To transfer the sector to affect the number of users, The number of households is affected for the faulty section, In order to be able to use the electricity price, Is the load rate of the distribution transformer.
5. The intelligent distribution network overhead line switch layout method according to claim 1, wherein after determining whether the distance between the first switch and the second switch is greater than a preset distance threshold, the method further comprises: if the distance between the second switch and the third switch is not greater than the preset distance threshold, moving the second switch in the direction away from the power end on the sub-line section, and judging whether the distance between the second switch and the third switch is greater than the preset distance threshold, wherein the second switch and the third switch are two adjacent switches, and the distance between the third switch and the power end is greater than the distance between the second switch and the power end; Outputting the updated switch position of the second switch in the sub-line section if the distance between the second switch and the third switch is larger than a preset distance threshold; and if the distance between the second switch and the third switch is not greater than the preset distance threshold, directly deleting the second switch.
6. An intelligent distribution system for distribution network overhead line switches, comprising: The acquisition module is configured to acquire the power supply area, the length of the branch line and the distribution variable number and the distribution variable capacity of the splicing tape of the 10kV line to be modified; The first judging module is configured to judge whether the branch line connected with the 10kV line to be modified is a large branch or not by adopting a preset branch judging strategy according to the power supply area, the length of the branch line, the number of the distribution transformers and the distribution transformer capacity; The splitting module is configured to dynamically split each branch line according to a preset line splitting strategy to obtain at least one single-radiation-shaped sub-line if each branch line connected with the 10kV line to be modified is not a large branch; the division module is configured to divide a certain single-radiation-shaped sub-line according to a preset self-adaptive load balancing strategy to obtain at least one sub-line section allocation scheme corresponding to the certain single-radiation-shaped sub-line, wherein the expression of the self-adaptive load balancing strategy is as follows: , , , , , in the formula, In order to simultaneously consider the sum of the minimized absolute errors of the impedance distribution and the distribution transformer capacity distribution of each sub-line section of the 10kV line to be modified, The distribution capacity of the connection band of the kth line sub-line, For the distribution of the 10kV line splicing tapes to be modified, The total capacity of the distribution transformer for the 10kV line connecting belt to be modified, For the purpose of distributing the capacity equalization coefficient of the transformer, Is the equivalent impedance of the kth line sub-line, For the total impedance of the 10kV line to be retrofitted, For the average impedance of the 10kV line to be retrofitted, As the impedance equalization coefficient, the impedance of the sample, The number of sub-line sections; the selecting module is configured to calculate the scheme reliability of the at least one sub-line section allocation scheme and select a target sub-line section allocation scheme corresponding to the maximum scheme reliability; the second judging module is configured to set a switch at the head end of each target sub-line section in the target sub-line section distribution scheme and judge whether the distance between a first switch and a second switch is larger than a preset distance threshold value, wherein the first switch and the second switch are two adjacent switches, and the distance between the second switch and the power supply end is larger than the distance between the first switch and the power supply end; And the output module is configured to output the switch positions installed at the head ends of the target sub-line sections if the distance is greater than a preset distance threshold, namely a final switch intelligent layout scheme.
7. An electronic device comprising at least one processor and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-5.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any one of claims 1 to 5.

Description

Intelligent distribution method and system for overhead line switches of power distribution network Technical Field The invention belongs to the technical field of power distribution network planning, and particularly relates to an intelligent distribution method and system for power distribution network overhead line switches. Background Under the great background of the vigorous development of the current power industry, the power distribution network is used as a key end link of a power system, and the stable and reliable operation of the power distribution network is important for guaranteeing the normal order of social production and life. However, the current distribution network exposes a series of problems to be solved in the actual operation process. At present, the Chinese patent with publication number CN115241875A discloses that the switch layout scheme does not consider the conditions of economy of switch distribution, the relation of the layout positions of a main line and a branch line switch, insufficient passing rate of a connection N-1 under a weak net rack and the like, for example, the Chinese patent with publication number CN115241875A discloses that the fault of the branch line behind an F2 pole tower, the fault of the F2+1 and the F2-1 switches can cause the switch to jump simultaneously due to the too close distance and the limit of the protection fixed value of the outlet switch of a transformer substation, and the electricity utilization experience of a user on a branch 2 is influenced, and when the user of the branch 2 fails, the trip of the switch at the F2-1 position causes the power failure of the branch line behind the F2+1. The Chinese patent with publication number CN115241875A depends on the user to set a switch threshold, from the basic level, the more the number of switches is, the smaller the fault section is, the more convenient the fault positioning is, and the user needs to self-define the point setting switch based on the actual conditions of line operation condition, line corridor and the like, and has limitation based on the automatic recommendation of the system, so as to comprehensively consider the layout economy and the configuration of the value level difference of the switch protection. Therefore, in the prior art, on the one hand, the phenomenon that the overhead line switch of the power distribution network is unreasonably arranged is common. The number of the partial area switches is insufficient, failure points cannot be timely isolated when failures occur, so that the influence range of the failures is rapidly enlarged, and the other area switches are too densely arranged, so that the construction and maintenance cost is increased, and the problems of misoperation or refusal of protection and the like can be caused due to improper cooperation among the switches. On the other hand, with the rapid increase of power loads, the power distribution network structure is increasingly complex and changeable, and the power supply requirements also show a trend of diversification and high standardization. The traditional manual planning method mainly depends on experience and simple calculation of planners, is difficult to comprehensively and accurately consider various factors, and cannot adapt to the complex and changeable power distribution network structure and the increasing power supply requirements. Disclosure of Invention The invention provides an intelligent distribution method and system for a power distribution network overhead line switch, which are used for solving the technical problems that the traditional manual planning method mainly depends on experience and simple calculation of planners, various factors are difficult to comprehensively and accurately consider, and the complicated and changeable power distribution network structure and the increasingly-growing power supply requirement cannot be adapted. In a first aspect, the present invention provides an intelligent distribution network overhead line switch layout method, including: Acquiring the power supply area, the length of a branch line and the distribution variable number and the distribution variable capacity of a connecting strip of a 10kV line to be modified; Judging whether the branch line connected with the 10kV line to be modified is a large branch or not by adopting a preset branch judgment strategy according to the power supply area, the length of the branch line, the distribution quantity and the distribution capacity; If all branch lines connected with the 10kV line to be modified are not large branches, dynamically splitting all branch lines according to a preset line splitting strategy to obtain at least one single-radiation-shaped sub-line; Dividing a certain single-radiation-shaped sub-line according to a preset self-adaptive load balancing strategy to obtain at least one sub-line section allocation scheme corresponding to the certain single-radiation-shaped sub-line; Calcul