CN117708749A

CN117708749A - Multi-model fusion type power distribution network time-sharing segmentation line loss fine diagnosis method and system

Info

Publication number: CN117708749A
Application number: CN202410161214.0A
Authority: CN
Inventors: 陈锦铭; 陈烨; 袁宇波; 刘建; 叶迪卓然; 杨景刚; 焦昊; 岑炳成; 赵新冬; 嵇建飞; 马洲俊; 周祉君; 吴晨; 陈静; 李娟�; 黄哲忱; 梁伟; 罗拓
Original assignee: State Grid Jiangsu Electric Power Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Current assignee: State Grid Jiangsu Electric Power Co Ltd; Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2024-02-05
Filing date: 2024-02-05
Publication date: 2024-03-15
Anticipated expiration: 2044-02-05
Also published as: CN117708749B

Abstract

The invention discloses a method and a system for finely diagnosing time-sharing and sectional line loss of a multi-model fused power distribution network, wherein the method comprises the following steps: acquiring data required by time-sharing segmented line loss diagnosis of a power distribution network; utilizing a state estimation method to identify the credibility of the automatic switch to generate a credible switch set; traversing the trusted switch set, and generating a single-switch downstream segmentation set by using a pruning method; traversing a downstream segment set of the single switch, and respectively calculating a time-sharing segment statistical line loss rate and a time-sharing segment theoretical line loss rate of the downstream of the single switch by adopting a statistical method and a state estimation method; developing the comparison of two rates of the line loss of the downstream single switch, and generating a line loss abnormal downstream set of the line; aiming at the downstream set of the line loss abnormal single switch, performing abnormal diagnosis of the section transformation relation based on the power failure event, and outputting a suspected section transformation relation abnormal distribution set; and aiming at the downstream subsection of the line loss abnormal single switch with normal section transformation relation, carrying out distribution transformer electricity utilization abnormality diagnosis, and outputting a suspected electricity utilization abnormality distribution transformer set.

Description

Multi-model fusion type power distribution network time-sharing segmentation line loss fine diagnosis method and system

Technical Field

The invention belongs to the technical field of medium-voltage distribution network line loss diagnosis, and particularly relates to a method and a system for finely diagnosing time-sharing and sectional line loss of a multi-model fused distribution network.

Background

Line loss is a key indicator reflecting the business benefit and management level of a company. The traditional power distribution network line loss calculation is complete in space dimension, the time dimension is whole day, abnormal space-time sections of line loss are difficult to accurately position, part of intractable high-negative loss lines are difficult to treat, and abnormal electricity utilization behaviors are difficult to find. With continuous construction and continuous improvement of practical level of distribution automation, a large number of measurement terminals are added in the middle of a feeder line, traditional daily line loss calculation can be expanded to a time-sharing sectional line loss calculation mode which takes an automatic switch as a section and a measurement data sampling period as a period in time through deep fusion of distribution automation measurement data and marketing and allocation adjustment data, abnormal phenomena can be amplified to sections to which the abnormal phenomena belong, and fineness and accuracy of line loss analysis are improved.

Therefore, the method for studying the time-sharing and segmentation line loss fine diagnosis of the power distribution network based on the multi-model fusion and the related technology have important application values, can help related departments to accurately locate abnormal time-space sections of line loss, accelerate the location and tracking of abnormal line loss, and provide powerful handles for line loss problem management.

Disclosure of Invention

The invention aims to: the invention provides a method and a system for precisely diagnosing the line loss of a multi-model fused power distribution network in a time-sharing and segmentation manner, which are used for solving the problem that the line loss calculation of the current power distribution network is difficult to precisely locate abnormal space-time sections of the line loss.

The technical scheme is as follows: a multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis method comprises the following steps of;

step 1: obtaining a topological structure of a line to be diagnosed, a standing book of an automatic switch, a standing book of a distribution transformer, a line parameter to be diagnosed and a distribution transformer parameter; measuring data of a line to be diagnosed, measuring data of an automatic switch, a historical grading protection switching-on/off signal, measuring data of a distribution transformer and a historical power failure event are obtained; the automatic switch and the distribution transformer are positioned on a line to be diagnosed;

step 2: reliability identification is carried out on the automatic switch by using a state estimation method, and a reliable switch set is generated；

Step 3: traversing trusted switch setsGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>；

Step 4: traversing single switch downstream segment collectionsCalculating the time-sharing subsection statistical line loss rate of the downstream of the single switch by adopting a statistical method; traversing a single switch downstream segment set +. >Calculating the time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method;

step 5: for any one belonging to single-switch downstream segment collectionThe single switch downstream segment of the line loss ratio is only calculated when the deviation between the time division segment statistical line loss ratio and the time division segment theoretical line loss ratio is larger than the line loss two-rate deviation threshold valueThe downstream of the single switch is added into the downstream set of the abnormal single switch of the line loss in a sectionalized way, so as to generate the downstream set of the abnormal single switch of the line loss +.>；

Step 6: traversing line loss anomaly single switch downstream aggregationPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>；

Step 7: carrying out distribution transformer power consumption abnormality diagnosis based on state estimation method and portable measuring terminal on downstream section of line loss abnormality single switch with normal section transformation relation, and outputting suspected power consumption abnormality distribution transformer set。

Further, the utilization state estimation method performs reliability identification on the automatic switch to generate a reliable switch set Comprising the following steps:

starting from the automatic switch nearest to the head end of the line to be diagnosed, traversing to the automatic switch nearest to the tail end of the line to be diagnosed, and assuming that the first automatic switch on the line to be diagnosed is finishedUpstream of the individual automation switches is +.>For the +.>Upstream of the individual automation switches +.>Performing state estimation to estimate the power estimation value sequence of the first automatic switch>And current estimation sequence->；

Will be the firstPower measurement data of individual automation switches +.>And power estimation sequence->In contrast, only if the power deviation ratio of the two is smaller than the power deviation ratio threshold +.>When indicate->Power measurement data for the individual automation switches is available;

will be the firstCurrent measurement data of individual automation switches +.>And current estimation sequence->In contrast, only if the current deviation ratio of the two is smaller than the current deviation ratio threshold +.>In the time-course of which the first and second contact surfaces,then indicate +.>The current measurement data of the individual automation switches are available;

if at firstThe power measurement data and the current measurement data of the automatic switch are available, which indicates +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +. >As->Power data for the individual automation switches;

if at firstThe power measurement data of the automatic switch is available but the current measurement data is not available, indicating +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +.>As->Power data for the individual automation switches;

if at firstThe current measurement data of the automatic switch is available but the power measurement data is not available, indicating +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power estimation sequence of individual automation switches +.>As->Power data for the individual automation switches;

if at firstThe power measurement data and the current measurement data of the automatic switch are not available, and the +.>The automated switches are untrusted switches.

Further, the traversing trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>Comprising the following steps:

trusted switch set for judging line to be diagnosedWhether or not it is empty, if the trusted switch set +. >If the current state is not null, starting from a trusted switch nearest to the tail end of the line to be diagnosed, traversing to a trusted switch nearest to the head end of the line to be diagnosed; if the trusted switch set->If the current value is empty, stopping calculation, and adding the topological structure of the line to be diagnosed into a downstream segmentation set of the single switch +.>；

When traversing to trusted switch setThe%>A trusted switch, if present, with +.>Single switch downstream segment of trusted switch with root node and no other trusted switches with non-root node, non-leaf node>At the same time, and said single switch downstream section +.>More than 1 distribution transformer is included, the single switch downstream section is +.>Joining a single switch downstream segment set>In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +.>Is to be used in the present invention.

Further, the traversing single-switch downstream segment setThe statistical method is adopted to calculate the time-sharing and segmentation statistical line loss rate of the downstream of the single switch, and the method comprises the following steps:

assume a single switch downstream segment setDownstream section of the single switch >1 trusted switch is taken as a root node, and the sections share +.>Personal distribution and->A downstream trusted switch regarded as a load leaf node, obtain +.>Power data and +.>Power data of the individual power distribution transformer;

assuming that the power data of the trusted switch and the power data of the distribution transformer are within a specified statistical period of timeSampling at equal intervals, wherein the sampling time point is marked as +.>；

For the firstA trusted switch to be flown into the downstream section of the single switch +.>Is set to forward, outflow of the downstream section of the single switch +.>Is set to reverse, then +.>The individual trusted switches are +_ for the single switch downstream segment>In the specified statistical period +.>Is +.>Reverse integral power->The method comprises the following steps of:

；

in the method, in the process of the invention,is->Personal credibilityThe switch is at sampling time point +>Power data of (2);

for the firstThe downstream section of the single switch is provided with a plurality of distribution transformers>In the specified statistical period +.>Forward integrated power of (a)Reverse integral power->The method comprises the following steps of:

；

in the method, in the process of the invention,is->The individual distribution transformer is at the sampling time point +.>Power data of (2);

calculating a single switch downstream segment according toIn the specified statistical period +.>Is>Output electric quantity->：

；

Calculating a single switch downstream segment according toIn the specified statistical period +. >Line loss rate statistics by time-sharing segmentation of (2)：

。

Further, the traversing single-switch downstream segment setCalculating a time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method, comprising the following steps of:

for single-switch downstream segment set by using weighted least square state estimation methodDownstream segmentation of single switch in (a)Performing state estimation to estimate +.>Is->Middle->Power estimation sequence of trusted switches +.>And->Power estimation sequence of the individual distribution transformer +.>；

Using single-switch downstream segmentationThe power estimation value sequence of the trusted switch and the power estimation value sequence of the distribution transformer in the single switch downstream segment is calculated according to the following formula>Is +.>：

；

In the method, in the process of the invention,、/>respectively +.>The trusted switch uses the power estimate sequence +.>Calculated outForward and reverse integrated power amounts; />、/>Respectively +.>The power estimation value sequence of the personal distribution transformer>And the calculated forward integral electric quantity and the calculated reverse integral electric quantity.

Further, for any one belonging to the single-switch downstream segment setThe single switch downstream segment is added into the line loss abnormal single switch downstream set only when the deviation between the line loss statistics rate of the time division segment and the line loss theory line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the line loss abnormal single switch downstream set +_ >Comprising the following steps:

for any one belonging to single-switch downstream segment collectionIs->Obtaining the time-sharing subsection statistical line loss rate of any time period of the downstream subsection of the single switch +.>And the line loss rate of the time-sharing segmentation theory>；

If single switch downstream segmentTime-sharing segmentation statistics line loss rate of any time period +.>Line loss rate according to time division segmentation theory>The deviation between them satisfies the following:

；

then single switch downstream segmentationThe method is characterized in that the downstream section of the line loss abnormal single switch is added into the downstream set of the line loss abnormal single switch>In (a) and (b); in (1) the->Representing the line loss two rate deviation threshold for the downstream segment of the single switch.

Further, the traversing line loss abnormal single switch downstream collectionPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>Comprising the following steps:

based on the historical grading protection switching-on/off signals of the automatic switch and the historical power failure event of the distribution transformer, judging whether the downstream section of the line loss abnormal single switch has abnormal section-to-section relation according to the following conditions Outputting suspected section transformation relation abnormal distribution transformer set in abnormal line loss abnormal single switch downstream section：

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>The historical grading protection switching-on/off signals of the automatic switch and the historical power failure events of the distribution transformer in the same period of time on the line are defined as distribution transformer power failure event set with grading protection faults ∈ ->Dividing a line into fault regions by means of switches with hierarchical protection faults>And non-faulty area->Wherein the fault area->Distribution transformer set surrounded by switches for hierarchical protection fault, non-fault area +.>Other distribution transformer sets which are not in a fault area on the line are provided;

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the failure area->If the line loss is abnormal, the downstream section of the single switch is divided into two sectionsAll the internal distribution transformers should have power failure, and the line loss is abnormal and the downstream section of the single switch is +.>Distribution transformer power failure event set with internal distribution transformer and hierarchical protection faults>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers >In (a) and (b); only when the non-stop set of changes should be stopped +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformer is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein, the change set should be stopped and not stoppedThe number of the distribution changes->The calculation formula of the duty ratio is as follows:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>1 is a set of non-stop distribution changesThe number of the distribution changes in the system;

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the non-faulty area->In the middle, the line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers are not powered off; downstream segmentation of line loss abnormal single switch>Distribution transformer power failure event set with hierarchical protection fault>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>When there is a power failure, the downstream section of the abnormal line loss single switch is added with ∈>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +. >Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein, the change set is stopped and stoppedThe number of the distribution changes->The duty cycle calculation formula is as follows:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>To change the set without stoppingThe number of the distribution changes in the system;

based on the history power failure event of the distribution transformer without the history grading protection switching-on/switching-off signal of the automatic switch, judging whether the downstream section of the line loss abnormal single switch has abnormal section transformation relation according to the following conditions, and outputting a suspected section transformation relation abnormal distribution transformer set from the downstream section of the line loss abnormal single switch with abnormal section transformation relation：

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>The historical power failure event of the distribution transformer without the historical grading protection switching-on/off signals of the automatic switch in the same period on the line is defined as a distribution transformer power failure event set without grading protection faults->；

If abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set >Line loss abnormal single switch downstream section +.>The number of the power-off auxiliary variables>The duty cycle is greater than threshold->When the line loss is abnormal, the downstream section of the single switch is +.>All the internal distribution transformers should be powered off, if the line loss is abnormal, the downstream section of the single switch is +.>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The distribution transformer number ratio of (2) is less than or equal to a threshold value +.>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein the line loss is abnormalSingle switch downstream segmentationThe number of the power-off auxiliary variables>The calculation formula of the duty ratio is as follows:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>Downstream section of single switch for line loss abnormality>The number of internal power outage distribution transformers;

if abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>Distribution transformer quantity ratio in presence of power failure>Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +. >All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +.>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein, the line loss abnormal single switch downstream subsectionDistribution transformer quantity ratio in presence of power failure>The calculation formula is as follows:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>The number of power distribution transformers in the downstream section of the line loss abnormal single switch is increased.

Further, the downstream section of the line loss abnormal single switch with normal section transformation relation is subjected to distribution transformer power utilization abnormality diagnosis based on a state estimation method and a portable measuring terminal, and a suspected power utilization abnormality distribution transformer set is outputComprising the following steps:

s700: line loss taking abnormal single switch downstream collectionJudging whether only one private transformer exists in the line loss abnormal single switch downstream section with normal section change relation, if so, estimating a private transformer power estimated value sequence by using a weighted least square state estimation method, comparing the private transformer power estimated value sequence with the private transformer power measured data, and only comparing the power deviation rate of the power estimated value sequence and the private transformer power measured data with a power deviation rate threshold value or more >Is added into the suspected power consumption abnormal distribution set +.>In (a) and (b); otherwise, assume that there isCalculating the +.f. of each private transformer in a specified statistical period of time by using the power measurement data of the private transformer>The integrated electric quantity in the network is ranked, and an integrated electric quantity ranking set +.>And performs S710;

s710: taking a current integrated power rank setA first name of the private transformer, and installing 1 portable measuring terminal at the upstream of the private transformer;

s720: dividing a single switch downstream section with normal line loss abnormal relation of the current section into an upstream sub-section and a downstream sub-section by utilizing a portable measuring terminal, calculating the statistical line loss rate of the upstream sub-section and the downstream sub-section, and executing S730 if the statistical line loss rate of the downstream sub-section is greater than that of the upstream sub-section; if the statistical line loss rate of the downstream sub-segment is not greater than that of the upstream sub-segment, ranking the set in the integral electric quantityEliminates the spot change in the middle, performs S710 until the score power rank set +.>Stopping for empty;

s730: estimating a power estimation value sequence of the spot transformer identified as the suspected power utilization abnormality by using a weighted least square state estimation method, comparing the power estimation value sequence of the spot transformer with power measurement data of the spot transformer, and only comparing the power deviation rate of the power estimation value sequence and the power measurement data with a power deviation rate threshold value larger than the power deviation rate threshold value Is added into the suspected power consumption abnormal distribution set +.>Is a kind of medium.

The invention discloses a multi-model fused power distribution network time-sharing segmentation line loss fine diagnosis system, which comprises the following components;

the diagnosis data acquisition module is used for acquiring the topological structure of the line to be diagnosed, the standing book of the automatic switch, the standing book of the distribution transformer, the line parameter to be diagnosed and the distribution transformer parameter; measuring data of a line to be diagnosed, measuring data of an automatic switch, a historical grading protection switching-on/off signal, measuring data of a distribution transformer and a historical power failure event are obtained; the automatic switch and the distribution transformer are positioned on a line to be diagnosed;

the trusted switch set generating module is used for identifying the credibility of the automatic switch by using a state estimation method to generate a trusted switch set；

A single switch downstream segment set generation module for traversing the trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>；

The line loss rate calculation module is used for traversing the downstream segment set of the single switchCalculating the time-sharing subsection statistical line loss rate of the downstream of the single switch by adopting a statistical method; traversing a single switch downstream segment set +. >Calculating the time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method;

a line loss abnormal single switch downstream set generation module for generating a single switch downstream segmented set for any oneThe single switch downstream segment is added into the abnormal single switch downstream set of the line loss only when the deviation between the line loss rate counted by the time division segment and the theoretical line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss>In this way, a line loss abnormality single switch downstream set +.>；

The suspected section transformation relation abnormal distribution transformation set output module is used for traversing the line loss abnormal single-switch downstream setPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>；

The suspected power consumption abnormal distribution transformer set output module is used for carrying out distribution transformer power consumption abnormality diagnosis based on a state estimation method and a portable measuring terminal on the downstream section of the line loss abnormal single switch with normal section transformation relation and outputting a suspected power consumption abnormal distribution transformer set 。

Further, the utilization state estimation method performs reliability identification on the automatic switch to generate a reliable switch setComprising the following steps:

from closest automation to the line head to be diagnosedStarting the chemical switch, traversing to the end of the automatic switch nearest to the tail end of the line to be diagnosed, and assuming that the line to be diagnosed is the firstUpstream of the individual automation switches is +.>For the +.>Upstream of the individual automation switches +.>Performing state estimation to estimate the power estimation value sequence of the first automatic switch>And current estimation sequence->；

will be the firstPersonal automationCurrent measurement data +.>And current estimation sequence->In contrast, only if the current deviation ratio of the two is smaller than the current deviation ratio threshold +.>When it is, then indicate->The current measurement data of the individual automation switches are available;

if at firstThe power measurement data and the current measurement data of the automatic switch are available, which indicates +. >The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +.>As->Power data for the individual automation switches;

if at firstThe power measurement data of the automatic switch is available but the current measurement data is not available, indicating +.>Personal automation deviceThe switch is changed into a trusted switch, and the trusted switch is added into the trusted switch set>In (1), will be->Power measurement data of individual automation switches +.>As->Power data for the individual automation switches;

Further, the traversing trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method >Comprising the following steps:

trusted switch set for judging line to be diagnosedWhether or not it is empty, if the trusted switch set +.>If the current state is not null, starting from a trusted switch nearest to the tail end of the line to be diagnosed, traversing to a trusted switch nearest to the head end of the line to be diagnosed; if the trusted switch set->If the current value is empty, stopping calculation, and adding the topological structure of the line to be diagnosed into a downstream segmentation set of the single switch +.>；

When traversing to trusted switch setThe%>A trusted switch, if present, with +.>Single switch downstream segment of trusted switch with root node and no other trusted switches with non-root node, non-leaf node>When, and saidSingle switch downstream segment->More than 1 distribution transformer is included, the single switch downstream section is +.>Joining a single switch downstream segment set>In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +.>Is to be used in the present invention.

Assume a single switch downstream segment setDownstream section of the single switch>1 trusted switch is taken as a root node, and the sections share +.>Personal distribution and->A downstream trusted switch considered to be a load leaf node,acquisition->Power data and +.>Power data of the individual power distribution transformer;

；

in the method, in the process of the invention,is->The individual trusted switches are at the sampling time point +.>Power data of (2);

；

calculating a single switch downstream segment according toIn the specified statistical period +.>Is >Output electric quantity->：

；

Calculating a single switch downstream segment according toIn the specified statistical period +.>Line loss rate statistics by time-sharing segmentation of (2)：

。

Further, the traversing single-switch downstream segment setCalculating time-sharing segmentation theory of downstream of single switch by using state estimation methodThe line loss rate comprises the following steps:

；

In the method, in the process of the invention,、/>respectively +.>The trusted switch uses the power estimate sequence +.>The calculated forward integral electric quantity and reverse integral electric quantity; />、/>Respectively +.>The power estimation value sequence of the personal distribution transformer>And the calculated forward integral electric quantity and the calculated reverse integral electric quantity.

Further, for any one belonging to the single-switch downstream segment set The single switch downstream segment is added into the line loss abnormal single switch downstream set only when the deviation between the line loss statistics rate of the time division segment and the line loss theory line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the line loss abnormal single switch downstream set +_>Comprising the following steps:

；

Further, the traversing line loss abnormal single switch downstream collectionHistorical power failure event based on distribution transformer and historical grading protection switching-on/off signal of automatic switch, and power failure event based is carried outDiagnosing the abnormal section change relation to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation >Comprising the following steps:

based on the historical grading protection switching-on/off signals of the automatic switch and the historical power failure event of the distribution transformer, judging whether the downstream section of the line loss abnormal single switch has abnormal section transformation relation according to the following conditions, and outputting a suspected section transformation relation abnormal distribution transformer set from the downstream section of the line loss abnormal single switch with abnormal section transformation relation：

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the failure area->If the line loss is abnormal, the downstream section of the single switch is divided into two sectionsAll the internal distribution transformers should have power failure, and the line loss is abnormal and the downstream section of the single switch is +. >Distribution transformer power failure event set with internal distribution transformer and hierarchical protection faults>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformer is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；/>

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the non-faulty area->In the middle, the line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers are not powered off; downstream segmentation of line loss abnormal single switch>Distribution transformer power failure event set with hierarchical protection fault>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>When there is a power failure, the downstream section of the abnormal line loss single switch is added with ∈ >The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein, do not stopStop-fit transformer setThe number of the distribution changes->The duty cycle calculation formula is as follows:

；

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>Belonging toThe historical power failure event of the distribution transformer without the historical grading protection switching-on/switching-off signal of the automatic switch in the same period on the line is defined as a distribution transformer power failure event set without grading protection faults- >；

If abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>The number of the power-off auxiliary variables>The duty cycle is greater than threshold->When the line loss is abnormal, the downstream section of the single switch is +.>All the internal distribution transformers should be powered off, if the line loss is abnormal, the downstream section of the single switch is +.>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The distribution transformer number ratio of (2) is less than or equal to a threshold value +.>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

wherein, the line loss abnormal single switch downstream subsectionThe number of the power-off auxiliary variables>The calculation formula of the duty ratio is as follows:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>Downstream section of single switch for line loss abnormality>The number of internal power outage distribution transformers; />

If abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Downstream of the line loss anomaly single switchSegmentation->Distribution transformer quantity ratio in presence of power failure >Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +.>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

S700: line loss taking abnormal single switch downstream collectionJudging whether only one private transformer exists in the line loss abnormal single switch downstream section with normal middle section transformation relation, if so, estimating the power estimation value sequence of the private transformer by using a weighted least square state estimation method, and combining the power estimation value sequence of the private transformer with the power of the private transformerComparing the measured data, and only comparing the power estimated value sequence with the power measured data of the special transformer, wherein the power deviation rate is larger than the power deviation rate threshold value +.>Is added into the suspected power consumption abnormal distribution set +.>In (a) and (b); otherwise, assume that there isCalculating the +.f. of each private transformer in a specified statistical period of time by using the power measurement data of the private transformer>The integrated electric quantity in the network is ranked, and an integrated electric quantity ranking set +.>And performs S710;

s720: dividing a single switch downstream section with normal line loss abnormal relation of the current section into an upstream sub-section and a downstream sub-section by utilizing a portable measuring terminal, calculating the statistical line loss rate of the upstream sub-section and the downstream sub-section, and executing S730 if the statistical line loss rate of the downstream sub-section is greater than that of the upstream sub-section; if the statistical line loss rate of the downstream sub-segment is not greater than that of the upstream sub-segment, ranking the set in the integral electric quantity Eliminates the spot change in the middle, performs S710 until the score power rank set +.>Stopping for empty;

s730: estimating a power estimation value sequence of the spot transformer identified as the suspected power utilization abnormality by using a weighted least square state estimation method, comparing the power estimation value sequence of the spot transformer with power measurement data of the spot transformer, and only comparing the power deviation rate of the power estimation value sequence and the power measurement data with a power deviation rate threshold value larger than the power deviation rate threshold valueIs added into the suspected power consumption abnormal distribution set +.>Is a kind of medium.

The invention discloses computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of a multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis method when executing the computer program.

The invention discloses a storage medium which stores a diagnosis program, wherein the diagnosis program realizes the steps of a multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis method when being executed by at least one processor.

The beneficial effects are that: compared with the prior art, the invention has the following advantages:

(1) The invention expands the whole line total daily line loss calculation to a time-sharing sectional line loss calculation mode which takes an automatic switch as a section and takes a measured data sampling period as a period in time, is beneficial to amplifying an abnormal phenomenon into a section to which the abnormal phenomenon belongs, and greatly improves the fineness and the accuracy of line loss analysis;

(2) According to the invention, a statistical method and a weighted least square state estimation method are utilized to respectively calculate the line loss two-rate based on the time-sharing segmentation statistical line loss rate and the theoretical line loss rate of the single-switch downstream, and the line loss two-rate is utilized to compare and obtain the line loss abnormal single-switch downstream, so that the diagnosis accuracy is greatly improved;

(3) The invention provides a diagnosis method for abnormal section change relation based on a power failure event, which can realize rapid diagnosis of the distribution transformer with abnormal section change relation, and is convenient for operation and maintenance personnel to correctly maintain the section change relation;

(4) The invention provides distribution transformer power consumption abnormality diagnosis based on a state estimation method and a portable measuring terminal, which can find out abnormal power consumption behaviors in time and help related departments to treat part of intractable high-negative loss lines;

(5) The invention has simple calculation and clear principle, can realize accurate positioning of the space-time section of the line loss abnormality, quickens the positioning and tracking of the line loss abnormality, provides a powerful grip for treating the line loss problem, and has good application prospect.

Drawings

FIG. 1 is a schematic flow diagram of a method for fine diagnosis of time-sharing and sectional line loss of a multi-model fusion power distribution network;

FIG. 2 is a schematic diagram of a single line of the embodiment 1;

FIG. 3 is a schematic diagram of a generic mode of a single switch downstream segment;

FIG. 4 is an equivalent mode schematic of a single switch downstream segment;

fig. 5 is a block diagram of a multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis system.

Detailed Description

The technical scheme of the invention is further described with reference to the accompanying drawings and the embodiments.

Example 1

In the embodiment, 2023, 7 and 2 days are adopted for a certain line of a certain transformer substation in a certain cityFor example, the invention provides a multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis method.

Fig. 1 depicts the application of the multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis method to a medium voltage power distribution network, including but not limited to medium voltage power distribution network line loss diagnosis. As shown in fig. 1, the method for precisely diagnosing the line loss of the time-sharing and segmentation of the power distribution network by adopting the multi-model fusion in the embodiment mainly comprises the following steps:

step 1: certain line of certain transformer substation in certain cityThe under jurisdiction 19 distribution transformers and 6 automatic switches specifically comprise: the single line diagram of the public transformer 9, the private transformer 10, the 1 breaker and the 5 automatic switches is shown in fig. 2. Acquisition of line from PMS (device asset lean management) System >The bus transformer comprises a topological structure, a bus standing book, 19 distribution transformers, 1 breaker and 5 automation switches, the association relation among buses, lines, the automation switches and the distribution transformers, the wire length, the resistance, the reactance, the rated power, the allowable current-carrying capacity and other equipment parameters of the lines, and the distribution transformer, the resistance, the reactance and other equipment parameters of the distribution transformers. />

And acquiring 96-point power, current and voltage data of a line of 2023, 7 and 2 days by using a breaker number and a bus number from a D5000 system, acquiring 96-point power and current data of 5 automatic switches of 2023, 7 and 2 days by using an automatic switch number from a power distribution automation system, acquiring 96-point power, voltage and current data of 2023, 7 and 2 days by using an acquisition object number corresponding to 19 distribution transformers from an electricity acquisition system, and acquiring historical power failure events of 19 distribution transformers before 2023, 7 and 2 days and historical grading protection switching signals of the automatic switches from a power supply reliability system.

Step 2: utilizing a weighted least squares state estimation method to carry out automatic switch reliability identification and generate a circuitIs a trusted switch set->The method comprises the steps of carrying out a first treatment on the surface of the The specific operation steps comprise:

s200: from distance lineThe nearest automation switch at the head end starts to traverse to the distance line +. >The end nearest automation switch ends, assuming line +.>Go up to->Upstream of the individual automation switches is +.>For the +.>Upstream of the individual automation switches +.>Performing state estimation to estimate the power estimation value sequence of the first automatic switch>And current estimation sequence->；

As shown in fig. 2, assume a slave distance lineThe nearest automation switch at the head end starts to traverse to the distance line +.>The last automatic switch of end is finished, namely the traversal order is: the automatic switches BR1, BR2, BR3, BR4 and BR5 take the automatic switch BR1 as an example, the upstream of the automatic switch BR1 is BR-BR1, the automatic switch BR1 comprises 4 distribution transformers such as distribution transformer PB1, distribution transformer PB15, distribution transformer PB16 and distribution transformer PB17, the equipment account, equipment parameters, power, voltage and current measurement data of the upstream BR-BR1 are acquired, the state estimation is carried out on the upstream of the automatic switch BR1 by using a weighted least square state estimation method, and the power estimation of the 1 st automatic switch BR1 is estimatedValue sequence->Current estimation sequence->Other automatic switch same calculates power estimation sequence +.>Current estimation sequence->。

Comparing the power measurement data of the automatic switch with the power estimation value sequence, and only when the deviation rate between the power measurement data and the power estimation value sequence is smaller than the power deviation rate threshold value, indicating that the power measurement data of the automatic switch is available; the specific operation comprises the following steps:

Acquisition of the firstThe individual automation switches are in the time section +.>Power measurement data in->The method comprises the following steps:

；

in the method, in the process of the invention,respectively represent +.>Power measurement data and +.>The automatic switch is at the firstPower at each instant;

based on state estimation of the upstream of the automatic switch, the first is obtainedThe individual automation switches are in the time section +.>Power estimation sequence in ∈>The method comprises the following steps:

；

in the method, in the process of the invention,respectively represent +.>Power estimation sequence and +.>The automatic switch is at the +.>Power estimates at each instant;

comparing the power measurement data of the automatic switch with the power estimation value sequence only when the deviation rate between the power measurement data and the power estimation value sequence is smaller than the power deviation rate threshold valueThe power measurement data representing the automatic switch is available.

The deviation rate calculation formula of the power measurement data and the power estimation value sequence of the two automatic switches is as follows:

；

in the method, in the process of the invention,for line->Rated power of +.>Is->And->Deviation rate of->Representing time period +.>The number of sampling points in the inner part.

In this embodiment, the power deviation rate threshold valueTaking 3%, judging whether the power measurement data of the automatic switches BR1, BR2, BR3, BR4 and BR5 are available according to the steps, and calculating the above, wherein in the embodiment, the automatic switches with available power measurement data are BR1, BR2, BR3 and BR5, and the automatic switches with unavailable power measurement data are BR4.

S220: similarly, the current measurement data of the automatic switch is compared with the current estimation value sequence, and only when the deviation rate between the current measurement data and the current estimation value sequence is smaller than the current deviation rate threshold valueThe automatic switching current measurement data is available.

The deviation rate calculation formula of the current measurement data and the current estimation value sequence of the automatic switch is as follows:

；

in the method, in the process of the invention,for line->Allowable current capacity, < >>Is->Deviation rate of->Indicate->The automatic switch is at the +.>Current estimate at each instant +.>Indicate->The automatic switch is at the +.>Current at each instant;

in this embodiment, the current deviation rate threshold valueTaking 3%, and similarly judging whether the current measurement data of the automatic switches BR1, BR2, BR3, BR4 and BR5 are available, and through the calculation, in the embodiment, the automatic switches with available current measurement data are BR1, BR3 and BR4, and the automatic switches with unavailable current measurement data are BR2 and BR5.

S230: if at firstPower of individual automatic switchThe measurement data and the current measurement data are available, which indicates +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +.>As- >Power data for the individual automation switches; if%>The power measurement data of the automatic switch is available but the current measurement data is not available, indicating +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +.>As->Power data for the individual automation switches; if%>The current measurement data of the automatic switch is available but the power measurement data is not available, indicating +.>The automatic switches are trusted switches and are added to a trusted switch setIn (1), will be->Power estimation sequence of individual automation switches +.>As->Power data for the individual automation switches; if%>The power measurement data and the current measurement data of the automatic switch are not available, and the +.>The automated switches are untrusted switches.

In this embodiment, since the data quality of the breaker BR is better, the breaker BR is directly determined as a trusted switch, and the rule is used to determine whether the automated switches BR1, BR2, BR3, BR4, and BR5 are trusted, and the trusted switch is a set of trusted switchesComprises automatic switches BR, BR1, BR2, BR3, BR4 and BR5, and is as follows:

TABLE 1 automatic switch trusted identification results table

Step 3: traversing the route Is a trusted switch set->Generating all single-switch downstream segment sets of the trusted switch serving as a root node and other trusted switches without non-root nodes and non-leaf nodes by using pruning method>. The method specifically comprises the following steps:

there are two modes of single switch downstream segmentation: one is a single switch downstream segment in normal mode, see the dashed block diagram portion of fig. 3; the other is a single switch downstream segment in equivalent mode, see the dashed block diagram portion of fig. 4.

When traversing to trusted switch setThe%>A trusted switch, if present, with +.>Single switch downstream segment of trusted switch with root node and no other trusted switches with non-root node, non-leaf node>At the same time, and said single switch downstream section +.>More than 1 distribution transformer is included, the single switch downstream section is +. >Joining a single switch downstream segment set>In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +.>Is to be used in the present invention.

In the present embodiment, the circuitIs a trusted switch set->The method comprises the steps of starting from the reliable switch nearest to the tail end of a line to be diagnosed, traversing the reliable switch nearest to the head end of the line to be diagnosed to the end of the reliable switch nearest to the head end of the line to be diagnosed, wherein the traversing sequence is BR5, BR4, BR3, BR2, BR1 and BR, and 5 single-switch downstream segment sets are generated by utilizing the rule and utilizing a pruning method>: the method comprises the following steps of BR5 downstream segmentation, BR4 downstream segmentation, BR3-BR5 inter-segmentation, BR2 downstream segmentation and BR-BR1 inter-segmentation:

table 2 downstream segment generation results table for single switch

Step 4: traversing the routeIs a single switch downstream segment set +.>And respectively carrying out line loss two-rate calculation based on the single-switch downstream time-sharing segmentation statistical line loss rate and the theoretical line loss rate by using a statistical method and a weighted least square state estimation method. The method specifically comprises the following steps:

traversing the route Is a single switch downstream segment set +.>The method for calculating the line loss rate based on time-sharing segmentation of the downstream of the single switch by using a statistical method comprises the following steps:

when traversing single switch downstream segment collectionDownstream section of the single switch>At this time, assume a single switch downstream segment set +.>Downstream section of the single switch>1 trusted switch is taken as a root node, and the sections share +.>Personal distribution and->A downstream trusted switch regarded as a load leaf node, obtain +.>Power data and +.>Power data of the individual power distribution transformer;

assuming that the power data of the trusted switch and the power data of the distribution transformer are within a specified statistical period of timeSampling at equal intervals, wherein the sampling time point is marked as +.>；/>And->Respectively +.>Trusted switch and->The individual distribution transformer is at the sampling time point +.>The power measurement values of the switch and the transformer are calculated by rectangular area method to be in a specified statistical time period ++>Forward and reverse integrated power in:

for the firstA trusted switch to be flown into the downstream section of the single switch +.>Power data of (2)Is set to be forward and flows out of the downstream section of the single switch>Is set to reverse, then +.>The individual trusted switches are +_ for the single switch downstream segment>In the specified statistical period +. >Is +.>Reverse integral power->The method comprises the following steps of:

；

single switch downstream segmentationThe input electric quantity is->Forward integrated power sum +.>The sum of forward integral electric quantity of the individual distribution transformer, and the output electric quantity is +.>Reverse integrated power sum +.>The sum of the reverse integral electric quantity of the individual distribution transformer is calculated as the following formula>In the specified statistical period +.>Is>Output electric quantity->：

；

。

Traversing single switch downstream segment collectionsCalculating a time-sharing segmentation theoretical line loss rate of a downstream single switch by using a weighted least square state estimation method, wherein the method comprises the following steps of:

when traversing the lineIs a single switch downstream segment set +.>In the time of using the weighted least square state estimation method, the downstream segment set of the single switch is +.>Downstream section of the single switch>Performing state estimation to estimate +.>Is->Middle->Trusted switchPower estimation sequence +. >And->Power estimation sequence of the individual distribution transformer +.>；

Using single-switch downstream segmentationThe power estimation value sequence of the reliable switch and the power estimation value sequence of the distribution transformer are similar to the calculation of the statistical line loss rate, and the downstream section of the single switch is calculated according to the following formula>Is +.>：

；

In this embodiment, the method is used to calculate the whole line and 5 downstream segment sets of single switchDaily statistical line loss rate at 7 months and 2 days, daily theoretical line loss rate and [0,6h ]]，[6h,12h]，[12h,18h]，[18h,24h]The statistical line loss rate and the theoretical line loss rate for the four time periods are shown in table 3 below.

TABLE 3 time-sharing statistical line loss Rate and theoretical line loss Rate for lines and segments

Step 5: for any one belonging to single-switch downstream segment collectionThe single switch downstream segment is added into a single switch downstream set with abnormal line loss only when the deviation between the line loss statistics rate of the time division segment and the theoretical line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate a line- >Line loss anomaly single switch downstream set +.>Comprising the following steps:

for any one belonging to single-switch downstream segment collectionIs->Acquiring the downstream section of the single switch>Time-sharing segmentation statistics line loss rate of any time period +.>And the line loss rate of the time-sharing segmentation theory>；

；

then single switch downstream segmentationFor the downstream section of the abnormal single switch of line loss, add to the line +.>Line loss abnormal single switch downstream collection +.>In (a) and (b); in (1) the->Representing the line loss two rate deviation threshold for the downstream segment of the single switch.

In this embodiment, a single switch downstream segmentLine loss two-rate deviation threshold value +.>Taking 10%, calculating the daily line loss two-rate deviation of the whole line and 5 single-switch downstream segments at 7 months and 2 days respectively in the table 3 and [0,6h ]]，[6h,12h]，[12h,18h]，[18h,24h]The line loss two-rate deviation for the four time periods is shown in table 4 below. As can be seen from Table 4, when the deviation of the line loss two rates of the BR5 downstream segment and the BR3-BR5 intermediate segment exceeds the threshold value by 10%, the BR5 downstream segment and the BR3-BR5 intermediate segment are added to the line->Line loss anomaly single switch downstream set +.>Is a kind of medium.

TABLE 4 time-sharing line loss two-rate bias for feeder and segments

Step 6: traversing line loss anomaly single switch downstream aggregationPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>Comprising the following steps:

based on the historical grading protection switching-on/off signals of the automatic switch and the historical power failure event of the distribution transformer, judging whether the downstream section of the line loss abnormal single switch has abnormal section-to-section relation according to the following conditionsOutput suspected section transformation relation abnormal distribution transformer set in downstream section of line loss abnormal single switch：

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>The historical grading protection switching-on/off signals of the automatic switch and the historical power failure events of the distribution transformer in the same period of time on the line are defined as distribution transformer power failure event set with grading protection faults ∈ ->Dividing a line into fault regions by means of switches with hierarchical protection faults >And non-faulty area->Wherein the fault area->Distribution transformer set surrounded by switches for hierarchical protection fault, non-fault area +.>Other distribution transformer sets which are not in a fault area on the line are provided;

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the failure area->If the line loss is abnormal, the downstream section of the single switch is divided into two sectionsAll the internal distribution transformers should have power failure, and the line loss is abnormal and the downstream section of the single switch is +.>Distribution transformer power failure event set with internal distribution transformer and hierarchical protection faults>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformer is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>1 is a set of non-stop distribution changes The number of the distribution changes in the system; />

If the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the non-faulty area->In the middle, the line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers are not powered off; downstream segmentation of line loss abnormal single switch>Distribution transformer power failure event set with hierarchical protection fault>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>When there is a power failure, the downstream section of the abnormal line loss single switch is added with ∈>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

based on the history power failure event of the distribution transformer without the history grading protection switching-on/switching-off signal of the automatic switch, judging whether the downstream section of the line loss abnormal single switch has abnormal section transformation relation according to the following conditions, and outputting a suspected section transformation relation abnormal distribution transformer set from the downstream section of the line loss abnormal single switch with abnormal section transformation relation ：

wherein the line loss is abnormalSingle switch downstream segmentation The number of the power-off auxiliary variables>The calculation formula of the duty ratio is as follows:

；

if abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>Distribution transformer quantity ratio in presence of power failure>Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +.>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality >Total number of distribution changes, add>The number of power distribution transformers in the downstream section of the line loss abnormal single switch is increased.

In the present embodiment, the threshold valueAll take 25%, threshold->75% was taken. For the line to which the BR5 downstream segment, BR3-BR5 inter-segment belongs +.>Obtaining line between 1 st of 2023 and 7 th of 2023 ∈1->The automatic switch BR3 is found to generate the grading protection switch-on/off signals during the period from 13:43:00 to 14:15:00 of the 23 th month of 2023 in the period of 4 months of the year, the BR5 downstream section is in a fault area, 3 distribution transformer power failures are arranged in the BR5 downstream section, 1 distribution transformer PB14 has no power failure, the distribution transformer number ratio of the distribution transformer PB14 has no power failure, the distribution transformer count is 25%, and the threshold value in the S610 method is just met>And the BR5 downstream segment is a segment change relation abnormal segment, and the distribution transformer PB14 is a segment change relation abnormal distribution transformer.

Step 7: method for estimating weighted least square state of downstream section of abnormal line loss single switch with normal section transformation relation and distribution transformer electricity utilization variation of portable measuring terminalConstant diagnosis, outputting suspected power consumption abnormal distribution transformer setComprising the following steps:

s710: taking a current integrated power rank setA first name of the private transformer, and installing 1 portable measuring terminal at the upstream of the private transformer, wherein the optimum installation position of the portable measuring terminal is shown;

s720: by means of portabilityThe measuring terminal divides a line loss abnormal single switch downstream section with a normal current section change relation into an upstream sub-section and a downstream sub-section, calculates the statistical line loss rate of the upstream sub-section and the downstream sub-section, and if the statistical line loss rate of the downstream sub-section is larger than that of the upstream sub-section, the special transformer is suspected to be abnormal in power consumption in the downstream sub-section, and S730 is executed; if the statistical line loss rate of the downstream sub-segment is not greater than that of the upstream sub-segment, ranking the set in the integral electric quantityEliminates the spot change in the middle, performs S710 until the score power rank set +.>Stopping for empty;

For the spot transformer determined to be suspected abnormal electricity consumption in S710, estimating the power estimation value sequence of the spot transformer by using a weighted least squares state estimation method, comparing the power estimation value sequence of the spot transformer with the power measurement data, if the deviation rate between the two is greater than the power deviation rate threshold valueIf the special transformer is abnormal, adding the special transformer into the suspected abnormal power utilization distribution set +.>Is a kind of medium.

In the present embodiment of the present invention,aiming at the line loss abnormal section BR3-BR5 with normal section change relation, 2 public changes and 2 private changes are arranged below the section, PB5 and PB6 are private changes, PB7 and PB8 are public changes, the integral electric quantity of PB5 and PB6 on 7 months and 2 days is calculated, the integral electric quantity of PB6 is found to be larger, then a portable measuring terminal M1 is arranged on the upstream of PB6, and the section is divided into BR3-M1-BR5 and a downstream section of the portable measuring terminal M1. After analysis, if the statistical line loss rate of the downstream section of the portable measuring terminal M1 is larger than the statistical line loss rate of the sections between BR3-M1-BR5, the special transformer PB6 is suspected to be abnormal in power consumption. Estimating a power estimation value sequence of the special transformer PB6 by using a weighted least square state estimation method, and comparing the power estimation value sequence with power measurement data of the special transformer PB6, wherein the power deviation rate threshold value is calculated by using a weighted least square state estimation method Taking 3%, and determining that the power estimated value sequence of the private transformer PB6 is abnormal power distribution transformer if the deviation rate between the power estimated value sequence of the private transformer PB6 and the power measurement data of the private transformer PB6 is greater than 3%. Through the verification of related personnel, the illegal operation of the private transformer PB6 is verified to open the cover of the electric meter, and the electric meter is stolen in an equal proportion mode.

Example 2

As shown in fig. 5, this embodiment discloses a multi-model fused power distribution network time-sharing segment line loss fine diagnosis system, which includes:

A single switch downstream segment set generation module for traversing the trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method >；

The line loss rate calculation module is used for traversing the downstream segment set of the single switchCalculating the time-sharing subsection statistical line loss rate of the downstream of the single switch by adopting a statistical method; traversing a single switch downstream segment set +.>Calculating the time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method;

The suspected section transformation relation abnormal distribution transformation set output module is used for traversing the line loss abnormal single-switch downstream setThe method comprises the steps of performing abnormal diagnosis of a section transformation relation based on a distribution transformer based on a historical power failure event and a historical grading protection switching signal of an automatic switch to obtain the section transformation relationOutputting suspected section change relation abnormal distribution transformer set from the abnormal line loss abnormal single switch downstream section >；

The suspected power consumption abnormal distribution transformer set output module is used for carrying out distribution transformer power consumption abnormality diagnosis based on a state estimation method and a portable measuring terminal on the downstream section of the line loss abnormal single switch with normal section transformation relation and outputting a suspected power consumption abnormal distribution transformer set。

In this embodiment, the reliability recognition is performed on the automated switch by using a state estimation method, so as to generate a trusted switch setComprising the following steps:

will be the firstCurrent measurement data of individual automation switches +.>And current estimation sequence- >In contrast, only if the current deviation ratio of the two is smaller than the current deviation ratio threshold +.>When it is, then indicate->The current measurement data of the individual automation switches are available;

if at firstThe power measurement data and the current measurement data of the automatic switch are available, which indicates +.>The automatic switch is a trusted switch and is added into a trusted switch set +.>In (1), will be->Power measurement data of individual automation switches +.>As->Power data for the individual automation switches;

if at firstThe current measurement data of the automatic switch is available but the power measurement data is not available, indicating +.>The automatic switch is a trusted switchSwitch, add to trusted switch set +.>In (1), will be->Power estimation sequence of individual automation switches +.>As->Power data for the individual automation switches;

if at firstThe power measurement data and the current measurement data of the automatic switch are not available, and the +. >The automated switches are untrusted switches.

In this embodiment, the trusted switch set is traversedGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>Comprising the following steps:

When traversing to trusted switch setThe%>A trusted switch, if present, with +.>Single switch downstream segment of trusted switch with root node and no other trusted switches with non-root node, non-leaf node>At the same time, and said single switch downstream section +.>More than 1 distribution transformer is included, the single switch downstream section is +.>Joining a single switch downstream segment set>In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +. >Is to be used in the present invention.

In this embodiment, a single switch downstream segment set is traversedThe statistical method is adopted to calculate the time-sharing and segmentation statistical line loss rate of the downstream of the single switch, and the method comprises the following steps:

assume a single switch downstream segment setDownstream section of the single switch>1 trusted switch is taken as a root node, and the sections share +.>Personal distribution and->A downstream trusted switch regarded as a load leaf node, obtain +.>Power data and +.>Power data of the individual power distribution transformer;

；

for the firstThe downstream section of the single switch is provided with a plurality of distribution transformers>At the appointed positionStatistical period +.>Forward integrated power of (a)Reverse integral power- >The method comprises the following steps of:

；

。

In this embodiment, a single switch downstream segment set is traversedCalculating a time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method, comprising the following steps of:

for single-switch downstream segment set by using weighted least square state estimation methodDownstream segmentation of single switch in (a)Performing state estimation to estimate +.>Is->Middle->Power estimation sequence of trusted switches +.>And->Power estimation sequence of the individual distribution transformer +.>；/>

；

In the method, in the process of the invention,、/>respectively +.>The trusted switch uses the power estimate sequence +.>The calculated forward integral electric quantity and reverse integral electric quantity; />、/>Respectively +. >The power estimation value sequence of the personal distribution transformer>And the calculated forward integral electric quantity and the calculated reverse integral electric quantity.

In the present embodiment, for any one belonging to a single-switch downstream segment setThe single switch downstream segment is added into the line loss abnormal single switch downstream set only when the deviation between the line loss statistics rate of the time division segment and the line loss theory line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the line loss abnormal single switch downstream set +_>Comprising the following steps:

；

In this embodiment, traversing the line loss anomaly single switch downstream setPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation >Comprising the following steps:

；

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>The historical power failure event of the distribution transformer without the historical grading protection switching-on/off signals of the automatic switch in the same period on the line is defined as a distribution transformer power failure event set without grading protection faults- >；

；

if abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>Distribution transformer quantity ratio in presence of power failure >Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +.>Distribution transformer of upper power failureThe set of changes is stopped without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Distribution and transformation assembly of (2)Count (n)/(l)>The number of power distribution transformers in the downstream section of the line loss abnormal single switch is increased.

In this embodiment, the distribution transformer power consumption abnormality diagnosis based on the state estimation method and the portable measurement terminal is performed on the downstream section of the line loss abnormality single switch with normal section transformation relationship, and the suspected power consumption abnormality distribution transformer set is outputComprising the following steps:

S700: line loss taking abnormal single switch downstream collectionJudging whether only one private transformer exists in the line loss abnormal single switch downstream section with normal section change relation, if so, estimating a private transformer power estimated value sequence by using a weighted least square state estimation method, comparing the private transformer power estimated value sequence with the private transformer power measured data, and only comparing the power deviation rate of the power estimated value sequence and the private transformer power measured data with a power deviation rate threshold value or more>Is added into the suspected power consumption abnormal distribution set +.>In (a) and (b); otherwise, assume that there isCalculating the +.f. of each private transformer in a specified statistical period of time by using the power measurement data of the private transformer>The integrated electric quantity in the network is ranked, and an integrated electric quantity ranking set +.>And executeS710；

Example 3

The embodiment discloses a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps disclosed in any one of the embodiments.

Example 4

The present embodiment discloses a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps disclosed in any of the embodiments described above.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A multi-model fusion power distribution network time-sharing segmentation line loss fine diagnosis method is characterized by comprising the following steps of: comprises the following steps of;

Step 4: traversing single switch downstream segment collectionsCalculating the time-sharing subsection statistical line loss rate of the downstream of the single switch by adopting a statistical method; traversing a single switch downstream segment set +.>Calculating the time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method;

step 5: for any one belonging to single-switch downstream segment collectionUnder a single switch of (2)The downstream segment of the single switch is added into the downstream set of the abnormal single switch of the line loss only when the deviation between the line loss rate counted by the time-sharing segment and the theoretical line loss rate of the time-sharing segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the downstream set of the abnormal single switch of the line loss>；

Step 6: traversing line loss anomaly single switch downstream aggregationPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation >；

2. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: the utilization state estimation method performs reliability identification on the automatic switch to generate a reliable switch setComprising the following steps:

starting from the automatic switch nearest to the head end of the line to be diagnosed, traversing to the automatic switch nearest to the tail end of the line to be diagnosed, and assuming the line to be diagnosedUpper firstUpstream of the individual automation switches is +.>For the +.>Upstream of the individual automation switches +.>Performing state estimation to estimate the power estimation value sequence of the first automatic switch>And current estimation sequence->；

Will be the firstCurrent measurement data of individual automation switches +.>And current estimation sequence->In contrast, only if the current deviation ratio of the two is smaller than the current deviation ratio threshold +.>When it is, then indicate->The current measurement data of the individual automation switches are available;

3. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: the traversing trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>Comprising the following steps:

When traversing to trusted switchAggregationThe%>A trusted switch, if present, with +.>Single switch downstream segment of trusted switch with root node and no other trusted switches with non-root node, non-leaf node>At the same time, and said single switch downstream section +.>More than 1 distribution transformer is included, the single switch downstream section is +.>Joining a single switch downstream segment set >In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +.>Is to be used in the present invention.

4. The method for finely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1, which is characterized in thatThe method comprises the following steps: the traversing single switch downstream segment setThe statistical method is adopted to calculate the time-sharing and segmentation statistical line loss rate of the downstream of the single switch, and the method comprises the following steps:

For the firstA trusted switch to be flown into the downstream section of the single switch +.>Is set to forward, outflow of the downstream section of the single switch +.>Is set to reverse, then +. >The individual trusted switches are +_ for the single switch downstream segment>In the specified statistical period +.>Is +.>Reverse integral power->The method comprises the following steps of:

；

calculating a single switch downstream segment according toIn the specified statistical period +.>Is>Output electric quantity：

；

Calculating a single switch downstream segment according toIn the specified statistical period +.>Time-sharing segmented statistical line loss rate->：

。

5. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: the traversing single switch downstream segment setCalculating a time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method, comprising the following steps of:

for single-switch downstream segment set by using weighted least square state estimation methodSingle switch in (3)Downstream segment->Performing state estimation to estimate +. >Is->Middle->Power estimation sequence of trusted switches +.>And->Power estimation sequence of the individual distribution transformer +.>；

；

6. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: for any one belonging to single-switch downstream segment collectionThe single switch downstream segment is added into the line loss abnormal single switch downstream set only when the deviation between the line loss statistics rate of the time division segment and the line loss theory line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the line loss abnormal single switch downstream set +_>Comprising the following steps:

for any one belonging to single-switch downstream segment collection Is->Obtaining the time-sharing subsection statistical line loss rate of any time period of the downstream subsection of the single switch +.>And the line loss rate of the time-sharing segmentation theory>；

If single switch downstream segmentTime-sharing segmentation statistics line loss rate of any time period +.>And the line loss rate of time-sharing segmentation theoryThe deviation between them satisfies the following:

；

then single switch downstream segmentationThe method is characterized in that the downstream section of the line loss abnormal single switch is added into the downstream set of the line loss abnormal single switch>In (a) and (b); in (1) the->Representation sheetAnd a line loss two-rate deviation threshold value of a downstream section of the switch.

7. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: the traversing line loss abnormal single switch downstream collectionPerforming abnormal diagnosis of a section change relation based on a distribution transformer historical power failure event and an automatic switch historical grading protection switching signal to obtain a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>Comprising the following steps:

based on the historical grading protection switching-on/off signals of the automatic switch and the historical power failure event of the distribution transformer, judging whether the downstream section of the line loss abnormal single switch has abnormal section transformation relation according to the following conditions, and outputting a suspected section transformation relation abnormal distribution transformer set from the downstream section of the line loss abnormal single switch with abnormal section transformation relation ：

For any downstream set of single switch belonging to line loss abnormalityLine loss anomaly single switch downstream segment +.>Downstream section of single switch with abnormal line loss screening>Historical grading protection switching-on/off signals and distribution transformer historical power failure events of automatic switches in the same period on the line are definedDistribution transformer power failure event set for occurrence of hierarchical protection fault>Dividing a line into fault regions by means of switches with hierarchical protection faults>And non-faulty area->Wherein the fault area->Distribution transformer set surrounded by switches for hierarchical protection fault, non-fault area +.>Other distribution transformer sets which are not in a fault area on the line are provided;

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the failure area->In the middle, the line loss is abnormal and the downstream section of the single switch is +.>All the internal distribution transformers should have power failure, and the line loss is abnormal and the downstream section of the single switch is +.>Distribution transformer power failure event set with internal distribution transformer and hierarchical protection faults>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformer is less than or equal to 2, judging the downstream section of the line loss abnormal single switch Line loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>1 is the set of non-stop distribution changes>The number of the distribution changes in the system;

if the line loss is abnormal, the downstream section of the single switch is divided into sectionsIn the non-faulty area->If the line loss is abnormal, the downstream section of the single switch is divided into two sectionsAll internal distribution transformers are not powered off; downstream segmentation of line loss abnormal single switch>Distribution transformer power failure event set with hierarchical protection fault>Performing correlation filtering, if the line loss is abnormal, the downstream section of the single switch is +>When there is a power failure, the downstream section of the abnormal line loss single switch is added with ∈>The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The number of the distribution changes->The duty ratio is less than or equal to a threshold value%>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set >In (a) and (b);

；

If abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>The number of the power-off auxiliary variables>The duty cycle is greater than threshold->When the line loss is abnormal, the downstream section of the single switch is +.>All the internal distribution transformers should be powered off, if the line loss is abnormal, the downstream section of the single switch is +. >If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The distribution transformer number ratio of (2) is less than or equal to a threshold value +.>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switchLine loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>Downstream segmentation for line loss abnormal single switchThe number of internal power outage distribution transformers;

if abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>Distribution transformer quantity ratio in presence of power failure>Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +.>The distribution transformer with upper power failure is put into the distribution transformer set without stopping >In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

8. The method for precisely diagnosing the time-sharing segmented line loss of the multi-model fusion power distribution network according to claim 1 is characterized in that: the downstream subsection of the line loss abnormal single switch with normal section transformation relation is subjected to distribution transformer power utilization abnormality diagnosis based on a state estimation method and a portable measuring terminal, and a suspected power utilization abnormality distribution transformer set is outputComprising the following steps:

s700: line loss taking abnormal single switch downstream collectionDownstream segmentation of a line loss abnormal single switch with normal middle section variable relation is carried out, and the line loss abnormal single switch with normal section variable relation is judged If only one spot transformer exists in the downstream segment, estimating a power estimation value sequence of the spot transformer by using a weighted least square state estimation method, comparing the power estimation value sequence of the spot transformer with power measurement data of the spot transformer, and only judging whether the power deviation rate of the power estimation value sequence and the power measurement data of the spot transformer is greater than a power deviation rate threshold value->Is added into the suspected power consumption abnormal distribution set +.>In (a) and (b); otherwise, assume there is->Calculating the +.f. of each private transformer in a specified statistical period of time by using the power measurement data of the private transformer>The integrated electric quantity in the network is ranked, and an integrated electric quantity ranking set +.>And performs S710;

9. A multimode fused power distribution network time-sharing segmentation line loss fine diagnosis system is characterized in that: comprises the following steps of;

the trusted switch set generating module is used for identifying the credibility of the automatic switch by using a state estimation method to generate a trusted switch set ；

The suspected section transformation relation abnormal distribution transformation set output module is used for traversing the line loss abnormal single-switch downstream setHistorical power failure event based on distribution transformer and calendar of automatic switchPerforming grading protection on switching-on and switching-off signals, performing abnormal diagnosis on the section change relation based on the power failure event, obtaining a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation >；

10. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: the utilization state estimation method performs reliability identification on the automatic switch to generate a reliable switch setComprising the following steps:

11. A multi-model converged power distribution network time division system in accordance with claim 9Segment line loss fine diagnosis system, its characterized in that: the traversing trusted switch setGenerating a single-switch downstream segment set of the other trusted switches taking the trusted switches as root nodes and without non-root nodes and non-leaf nodes by using a pruning method>Comprising the following steps:

When traversing to trusted switch setThe%>A trusted switch, if present, with +.>Single switch downstream branch with each trusted switch being a root node and no other trusted switches other than root nodes, non-leaf nodes are presentSection->At the same time, and said single switch downstream section +.>More than 1 distribution transformer is included, the single switch downstream section is +.>Joining a single switch downstream segment set >In the single switch downstream section +.>Cut out from topology of the line to be diagnosed and let +.>The trusted switches are equivalent to load leaf nodes in the circuit topology to be diagnosed; otherwise, go on traversing trusted switch set +.>Is to be used in the present invention.

12. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: the traversing single switch downstream segment setThe statistical method is adopted to calculate the time-sharing and segmentation statistical line loss rate of the downstream of the single switch, and the method comprises the following steps:

；

。

13. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: the traversing single switch downstream segment setCalculating a time-sharing segmentation theoretical line loss rate of the downstream of the single switch by using a state estimation method, comprising the following steps of:

for single-switch downstream segment set by using weighted least square state estimation methodDownstream section of the single switch>Performing state estimation to estimate +. >Is->Middle->Power estimation sequence of trusted switches +.>And->Power estimation sequence of the individual distribution transformer +.>；

；

14. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: for any one belonging to single-switch downstream segment collectionThe single switch downstream segment is added into the line loss abnormal single switch downstream set only when the deviation between the line loss statistics rate of the time division segment and the line loss theory line loss rate of the time division segment is larger than the deviation threshold value of the two rates of the line loss, so as to generate the line loss abnormal single switch downstream set +_>Comprising the following steps:

；

15. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: the traversing line loss abnormal single switch downstream collectionDistribution transformer-based historical power outage event and automatic switch historyThe method comprises the steps of grading protection switching-on and switching-off signals, carrying out abnormal diagnosis on the section change relation based on a power failure event, obtaining a line loss abnormal single switch downstream section with abnormal section change relation, and outputting a suspected section change relation abnormal distribution transformer set from the line loss abnormal single switch downstream section with abnormal section change relation>Comprising the following steps:

；

in the method, in the process of the invention,downstream section of single switch for line loss abnormality>Total number of distribution changes, add>For the change set of stopping without stopping>The number of the distribution changes in the system;

historical grading protection switching-on/off signal based on non-automatic switch and with distribution transformerHistorical power failure event, judging whether the downstream section of the line loss abnormal single switch has abnormal segment change relation according to the following conditions, and outputting a suspected segment change relation abnormal distribution transformer set from the downstream section of the line loss abnormal single switch with abnormal segment change relation：

If abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>The number of the power-off auxiliary variables>The duty cycle is greater than threshold->When the line loss is abnormal, the downstream section of the single switch is +. >All the internal distribution transformers should be powered off, if the line loss is abnormal, the downstream section of the single switch is +.>If there is no distribution transformer with power failure, putting the distribution transformer without power failure into the set of non-stop distribution transformers>In (a) and (b); only when the non-stop set of changes should be stopped +.>The distribution transformer number ratio of (2) is less than or equal to a threshold value +.>Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switchLine loss abnormal single switch downstream segmentation for abnormal segment change relation and the non-stop distribution change set is added>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

if abnormal single switch downstream segmentation is utilized in line lossScreening distribution transformer power failure event set>Line loss abnormal single switch downstream section +.>Distribution transformer quantity ratio in presence of power failure>Less than or equal to threshold->The line loss is abnormal and the downstream section of the single switch is +.>All internal distribution transformers should not have power failure, if the line loss is abnormal, the downstream section of the single switch is +.>If there is a power failure distribution transformer, the downstream section of the abnormal line loss single switch is +. >The distribution transformer with upper power failure is put into the distribution transformer set without stopping>In (a) and (b); only when not stopping but stopping the set of changes +.>The ratio of the number of the distribution changes of (2)>Less than or equal to threshold->Or when the number of the distribution transformers is less than or equal to 2, judging the downstream section of the line loss abnormal single switch +.>Line loss abnormal single switch downstream segmentation for abnormal segment change relation, and the non-stop and non-stop distribution change set +.>Adding the kit into the suspected section transformation relationship abnormal transformation set>In (a) and (b);

；

16. The multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis system according to claim 9, wherein the system is characterized in that: the downstream subsection of the line loss abnormal single switch with normal section transformation relation is subjected to distribution transformer power utilization abnormality diagnosis based on a state estimation method and a portable measuring terminal, and a suspected power utilization abnormality distribution transformer set is outputComprising the following steps: />

S700: line loss taking abnormal single switch downstream collectionJudging whether only one private transformer exists in the line loss abnormal single switch downstream section with normal section change relation, if so, estimating a private transformer power estimated value sequence by using a weighted least square state estimation method, comparing the private transformer power estimated value sequence with the private transformer power measured data, and only comparing the power deviation rate of the power estimated value sequence and the private transformer power measured data with a power deviation rate threshold value or more >Dedicated addition of (2)To suspected power consumption abnormal distribution set +.>In (a) and (b); otherwise, assume there is->Calculating the +.f. of each private transformer in a specified statistical period of time by using the power measurement data of the private transformer>The integrated electric quantity in the network is ranked, and an integrated electric quantity ranking set +.>And performs S710;

s730: estimating a power estimation value sequence of the power factor identified as the suspected power utilization abnormality by using a weighted least squares state estimation method Comparing the power estimation value sequence of the power transformer with the power measurement data of the power transformer, and only comparing the power deviation rate of the power estimation value sequence and the power measurement data with the power deviation rate threshold valueIs added into the suspected power consumption abnormal distribution set +.>Is a kind of medium.

17. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of a multi-model fusion power distribution network time-sharing segmented line loss fine diagnosis method according to any one of claims 1 to 8 when the computer program is executed by the processor.

18. A storage medium storing a diagnostic program which when executed by at least one processor performs the steps of a multi-model fused power distribution network time-sharing segmented line loss fine diagnostic method of any one of claims 1 to 8.