CN-121983925-A - Distribution network fault positioning and isolating method, system, equipment and medium based on line automation

CN121983925ACN 121983925 ACN121983925 ACN 121983925ACN-121983925-A

Abstract

The invention relates to the technical field of fault location of a power distribution network, and discloses a power distribution network fault location and isolation method, a system, equipment and a medium based on line automation, wherein the method comprises the steps of deploying intelligent terminals at a sectionalizing switch and a connecting switch of a power distribution line, and collecting line electric quantity data; extracting multi-dimensional fault characteristics, constructing a fusion criterion to confirm fault occurrence, calculating a fault direction according to the fault characteristics, judging the position of the fault relative to the terminal, exchanging fault direction and fault moment information by all intelligent terminals, determining a fault section based on a distributed cooperative algorithm, synchronizing and isolating the fault section after double confirmation is carried out by the intelligent terminals on two sides of the fault section, judging the fault type, searching and selecting a contact switch based on network topology and load information, and recovering power supply of a non-fault section. The invention can improve the accuracy and the robustness of fault discrimination, realize the one-time accurate isolation of faults, and realize the rapid recovery of power supply in non-fault sections.

Inventors

LONG JIAHUAN
YANG SHIPING
WANG WEI
ZHANG ZHAOFENG
YANG JIERUI
WANG ZHUOYUE
LI QINGSHENG
LI ZHEN
ZHANG YAN
LIU JINSEN
Liao Zewei
WANG YUXIANG
ZHANG RUIFENG
ZHANG PENGCHENG

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (10)

1. The utility model provides a distribution network fault location and isolation method based on line automation which is characterized in that the method comprises the following steps: an intelligent terminal is deployed at a sectionalizer and a tie switch of a distribution line, and line electrical quantity data are collected in real time; Based on the electrical quantity data, extracting multidimensional fault characteristics, and constructing a fusion criterion to confirm fault occurrence; calculating a fault direction according to the fault characteristics, and judging the position of the fault relative to the terminal; each intelligent terminal exchanges fault direction and fault moment information, and a fault section is determined based on a distributed cooperative algorithm; After the intelligent terminals on two sides of the fault section execute double confirmation, the fault section is synchronously isolated, and the fault type is judged; and searching and selecting a tie switch based on the network topology and the load information, and recovering the power supply of the non-fault section.
2. A line automation based power distribution network fault location and isolation method according to claim 1, wherein extracting multi-dimensional fault features based on the electrical quantity data and constructing fusion criteria to confirm fault occurrence comprises: Calculating a current abrupt change amount for detecting the occurrence time of the fault; extracting zero sequence current characteristics for judging a ground fault; decomposing the current signal by wavelet transformation, calculating the energy distribution of each frequency band, and extracting the transient state energy characteristics of the fault; And constructing a fusion criterion based on the current abrupt change quantity, the zero sequence current characteristic and the fault transient state energy characteristic.
3. The line automation-based power distribution network fault locating and isolating method according to claim 2, wherein calculating the fault direction according to the fault characteristics, and determining the position of the fault relative to the terminal comprises: judging by a power direction method, and calculating a fault transient power direction; The fault direction criteria are: When (when) When > 0, the fault is at the terminal Is opposite to the terminal Is in the positive direction; When (when) When <0, the fault is at the terminal Is opposite to the terminal In the negative direction.
4. A line automation based power distribution network fault location and isolation method as claimed in claim 3, wherein each intelligent terminal exchanges fault direction and fault time information, and determining fault sections based on a distributed collaborative algorithm comprises: Each terminal receives the fault direction and the fault moment information of the neighbor terminal to form an information matrix; Calculating the fault confidence coefficient of the line section between the adjacent terminals based on the consistency of the fault direction and the fault moment; Traversing all adjacent terminal pairs, calculating the fault confidence coefficient of each line section, and selecting the section with the highest fault confidence coefficient as the fault section.
5. The line automation based power distribution network fault locating and isolating method as claimed in claim 4, wherein each intelligent terminal exchanges fault direction and fault time information, and the fault section is determined based on a distributed cooperative algorithm, further comprising: After the fault section is selected, the adjacent terminal performs a round of information confirmation, and the terminal pair with highest confidence coefficient Broadcasting fault section information to its neighbors; after receiving, other terminals verify whether the result is consistent with the calculation result of the other terminals; If the information exchange and the distributed collaborative calculation are not consistent, repeating the information exchange and the distributed collaborative calculation once.
6. A line automation based power distribution network fault locating and isolating method as claimed in claim 5, wherein said synchronizing isolating fault sections and discriminating fault types includes: The switches on two sides of the fault section are synchronously opened, so that the fault section is isolated; detecting whether the fault is transient, and delaying after the isolation is completed The time, carry out the heuristic closing by the side switch, if circuit current and voltage resume normal after closing, judge as the transient fault; if the fault characteristic is detected to appear again after closing, the permanent fault is judged, the switch is opened again, the isolation state is maintained, and fault information is reported to the master station.
7. The line automation based power distribution network fault locating and isolating method as claimed in claim 6, wherein searching and selecting tie switches based on network topology and load information to restore power to non-faulty sections comprises: Traversing all tie switches Checking whether the interconnection switch can connect the power-losing section with the electrified circuit; For contact switches If one end of the power-losing section is connected with one section of the power-losing sections The other end is connected with a live line, so that the corresponding tie switch can be used for transferring; Calculating the priority of the transfer scheme; And selecting the liaison switch with the highest priority to execute the switching-on operation, and verifying whether the voltage of each node after transfer meets the power supply standard before switching on the liaison switch.
8. A distribution network fault locating and isolation system based on line automation, applying the method according to any of claims 1-7, comprising: the intelligent terminal acquisition module is used for acquiring line electrical quantity data in real time; The fault feature extraction module is used for extracting multidimensional fault features based on the electrical quantity data and constructing a fusion criterion to confirm fault occurrence; The distributed communication judging module is used for calculating a fault direction according to the fault characteristics and judging the position of the fault relative to the terminal; The cooperative positioning algorithm module is used for exchanging fault direction and fault moment information by all intelligent terminals and determining a fault section based on a distributed cooperative algorithm; the isolation control module is used for synchronously isolating the fault section and judging the fault type after the intelligent terminals on the two sides of the fault section perform double confirmation; and the power supply recovery module is used for searching and selecting the tie switch based on the network topology and the load information to recover the power supply of the non-fault section.
9. A computer device, comprising: A memory and a processor; The memory is configured to store computer executable instructions that, when executed by the processor, implement the steps of a line automation based power distribution network fault locating and isolating method according to any one of claims 1 to 7.
10. A computer readable storage medium storing computer executable instructions which when executed by a processor perform the steps of a line automation based power distribution network fault locating and isolating method according to any one of claims 1 to 7.

Description

Distribution network fault positioning and isolating method, system, equipment and medium based on line automation Technical Field The invention relates to the technical field of power distribution network fault positioning, in particular to a power distribution network fault positioning and isolating method, system, equipment and medium based on line automation. Background With the continuous expansion of the power distribution network scale and the continuous improvement of the requirements of users on the power supply reliability, the rapid and accurate realization of fault positioning and isolation is an indispensable link. At present, the main stream fault processing mode depends on a centralized architecture, namely, each node of a line is provided with a terminal to collect gas flow data and upload the gas flow data to the main station, the main station uniformly analyzes and decides faults and then issues control instructions to a field switch, and the fault processing mode based on an on-site fault indicator or a single gas flow criterion is also applied to part of lines and can support the fault processing automation of a power distribution network to a certain extent. However, the method still has partial limitation in practical application, and because of adopting a centralized processing mode, links such as data uploading, master station analysis, instruction issuing and the like can introduce time delay, so that the fault processing time is long, and often the time for processing the fault is up to a plurality of minutes, and the fault can continuously exist and the power failure range is enlarged in the period. Meanwhile, the method depends on a single fault criterion, and under complex working conditions such as distributed power supply access or operation mode change, the positioning accuracy is easy to be reduced, and misjudgment or missed judgment is easy to occur. In addition, the fault isolation process generally needs to reduce the fault area segment by segment through multiple trial power transmission operations, so that the power failure time of a non-fault section can be prolonged, multiple impacts on fault points can be caused, and the equipment safety and the power supply quality are affected. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a power distribution network fault positioning and isolating method and system based on line automation, which solve the main problems of long response time, single discrimination algorithm, great influence on accuracy by operation conditions, multiple times of operation required for fault isolation and long recovery time of the current fault positioning depending on centralized processing of a main station. In order to solve the technical problems, the invention provides the following technical scheme: in a first aspect, the present invention provides a method for locating and isolating faults of a power distribution network based on line automation, including: an intelligent terminal is deployed at a sectionalizer and a tie switch of a distribution line, and line electrical quantity data are collected in real time; Based on the electrical quantity data, extracting multidimensional fault characteristics, and constructing a fusion criterion to confirm fault occurrence; calculating a fault direction according to the fault characteristics, and judging the position of the fault relative to the terminal; each intelligent terminal exchanges fault direction and fault moment information, and a fault section is determined based on a distributed cooperative algorithm; After the intelligent terminals on two sides of the fault section execute double confirmation, the fault section is synchronously isolated, and the fault type is judged; and searching and selecting a tie switch based on the network topology and the load information, and recovering the power supply of the non-fault section. The optimal scheme of the power distribution network fault locating and isolating method based on line automation, disclosed by the invention, comprises the steps of extracting multidimensional fault characteristics based on the electrical quantity data, and constructing a fusion criterion to confirm fault occurrence, wherein the method comprises the following steps of: Calculating a current abrupt change amount for detecting the occurrence time of the fault; extracting zero sequence current characteristics for judging a ground fault; decomposing the current signal by wavelet transformation, calculating the energy distribution of each frequency band, and extracting the transient state energy characteristics of the fault; And constructing a fusion criterion based on the current abrupt change quantity, the zero sequence current characteristic and the fault transient state energy characteristic. The invention relates to a preferable scheme of a power distributio