CN107271852A - Complicated Distribution Network Fault Locating Method based on voltage dip information - Google Patents
Complicated Distribution Network Fault Locating Method based on voltage dip information Download PDFInfo
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- CN107271852A CN107271852A CN201710586720.4A CN201710586720A CN107271852A CN 107271852 A CN107271852 A CN 107271852A CN 201710586720 A CN201710586720 A CN 201710586720A CN 107271852 A CN107271852 A CN 107271852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a kind of Complicated Distribution Network Fault Locating Method based on voltage dip information.Step of the present invention includes：(1) failure reported using feed terminal unit is crossed stream information and primarily determines that fault section；(2) current vector information localization of faults short circuit current flow amount in the failure of feed terminal unit upload is utilized；(3) the voltage dip information and system node impedance matrix uploaded using each monitoring point calculates trouble point short circuit current flow amount；(4) each node in Ergodic Theory, calculates short circuit current flow deviation, determines malfunctioning node.The present invention realizes the accurate fault location of Complicated Distribution Network.For branched line is more, baroque actual power distribution network, its positioning result is more accurate, do not influenceed by branch line, and result is influenceed smaller by grounding resistance, load model, fault type, be conducive to shortening actual distribution network failure line walking time, customer outage hours, so as to improve distribution network reliability index.
Description
Technical field
The present invention relates to power distribution automation, Fault Diagnosis of Distribution Network, belong to intelligent grid field, and in particular to based on voltage
The Complicated Distribution Network Fault Locating Method of information temporarily drops.
Technical background
With China's expanding economy, requirement of all trades and professions to the quality of power supply is improved constantly, during long fault outage
Between will bring serious economic loss.According to statistics, the power-off event of user 80% be as caused by the failure of power distribution network, therefore,
After power distribution network breaks down, realize that fast and accurately fault location can shorten failure idle time, be Fault Isolation and extensive
It is multiple that basis is provided, and then improve the reliability index of power distribution network.Traditional electrical power distribution network fault location method is whole based on feeder line mostly
The failure that end unit (FTU) is uploaded crosses stream information, and fault section, this positioning are determined using matrix algorithm or intelligent algorithm
Method is only capable of fault location between two feed terminal units, and the precision of positioning result is not high, especially for cable
For road, it stills need the longer failure line walking time.Simultaneously as China's power distribution automation level is not high, most of distribution
Feeder line monitoring unit is fitted without on branch line in net, is only protected by fuse, therefore traditional fault location side
The method scope of application is smaller.For the Complicated Distribution Network that power distribution automation level is not high, branch line is more, based on voltage dip information
Complicated Distribution Network Fault Locating Method research have stronger adaptability and robustness in actual applications, with highly important
Theoretical and realistic meaning.
The content of the invention
The problem to be solved in the present invention is to overcome deficiency of the prior art there is provided a kind of based on voltage dip information
Complicated Distribution Network Fault Locating Method.The present invention is in the design of distribution network failure targeting scheme, and proposition utilizes feed terminal unit
(FTU) and electric energy quality monitoring system recording voltage temporarily drops information, current information and realizes being accurately positioned for trouble point, simultaneously should
Method only needs simple complex operation, and easy sequencing is realized, farthest improves the degree of accuracy of fault location, shortens event
Hinder the line walking time, improve user satisfaction.
To solve technical problem, solution of the invention comprises the following steps：
Step 1, the failure reported using feed terminal unit are crossed stream information and primarily determine that fault section；
Power distribution network is divided into several sections according to block switch and FTU position, the event reported using feed terminal unit
Hindered stream information formation fault message vector, combined with the network Description Matrix for describing distribution net topology, calculating obtains failure and sentenced
Set matrix, so as to primarily determine that fault section, fault coverage is narrowed down between two terminals.
Current vector information localization of faults short circuit current flow amount in step 2, the failure uploaded using feed terminal unit；Will
It is two classes to be divided to the FTU of each section direct neighbor, and a class electric current flows into the fault section from FTU, and another kind of electric current flows out from FTU
The fault section.Determine after fault section, ignore the influence of fault section internal loading electric current in failure process, estimation obtains failure
The actual fault current vector of point.
Step 3, utilize each monitoring point is uploaded in electric energy quality monitoring system voltage dip information and system node impedance
Matrix computations trouble point fault current vector；Accident analysis is carried out to each node in the fault section：It is assumed that failure occurs
Each node, the fault current vector for obtaining each node is calculated using the voltage dip information of each monitoring point.
Step 4, each node traveled through in the fault section, by obtained fault current vector with being calculated using FTU information
The contrast of physical fault current vector, calculate the minimum node of the vectorial deviation of the vectorial deviation of fault current, i.e. fault current
It is considered real malfunctioning node.
In the present invention, the step (1) is accomplished in the following manner：
According to the topology of power distribution network, using each FTU mount points as the corresponding boundary node of fault section, description network is formed
The network Description Matrix M of structure, its dimension is the quantity of installation FTU in network, when there is feeder line between node i and node j,
Corresponding element Mij、MjiFor 1, remaining element is 0；After power distribution network breaks down, the failure uploaded according to FTU crosses stream information
Fault message matrix G is formed, if the FTU at node does not flow through the fault current more than given threshold in advance, its correspondence
Diagonal element GiiFor 1, remaining element is 0.For the radial distribution networks network of single supply, when it breaks down, and if area
Duan Xianglian FTU is existing to be flowed through fault current and has again and do not flow through fault current, then the section is fault section.Therefore, by net
Network Description Matrix M is multiplied with fault message matrix G obtains fault verification matrix Q, and it is carried out to can determine whether after normalization processing
Fault section.
In the present invention, the step (2) is accomplished in the following manner：
FTU with fault section direct neighbor is divided to for two classes：One class electric current flows into the fault section from FTU, flows through this
Current vector is designated as I in class FTU failurei；Another kind of electric current flows out the fault section from FTU, in the failure for flowing through such FTU
Current vector is designated as Ij.The formula of trouble point short-circuit current value is when calculating physical fault：
In formula, IfeFor fault current vector approach, N1、N2Respectively with for the adjacent first kind of the fault section, Equations of The Second Kind
FTU quantity.
In the present invention, the step (3) is accomplished in the following manner：
After power distribution network breaks down, equivalent to adding an Injection Current-I at the f of trouble pointf, so as to will therefore
Power distribution network in barrier is divided into two parts, therefore, and the magnitude of voltage in network at any node can be divided into two parts：Normal component
And fault component, as shown in formula：
In formula：UiFor the voltage vector in failure at node i, Ui (0)For the voltage vector before failure at node i, ZifFor section
Mutual impedance at point i and trouble point f, IfFor fault current vector, N is the nodes in network.ZifPass through off-line calculation network
Nodal impedance matrix obtain, obtain after nodal impedance matrix, using electric energy quality monitoring system obtain it is each monitoring point failure before
And the voltage vector U in failurei (0)、Ui, you can calculate the fault current vector obtained at malfunctioning node.
In the present invention, the step (4) is accomplished in the following manner：
After section where the localization of faults, accident analysis is carried out to each node in the fault section：It is assumed that failure occurs
In each node, so that the fault current vector of each node is obtained, by obtained fault current vector with utilizing the calculating of FTU information
Fault current vector comparing calculation current vector deviation, the i.e. minimum node of current vector deviation are to be considered real event
Hinder node, defining current vector deviation is：
In formula：δkThe fault current average value and physical fault current deviation vector obtained for k-th of node failure of hypothesis
Mould, IfkmTo assume k-th of node failure, the fault current vector obtained by m-th of monitoring point voltage dip information, Nnode
For the total node number in fault section, NmFor the total number of electric energy quality monitoring point.
Obtain all δkAfterwards, the node corresponding to its minimum value is the malfunctioning node for being output as fault diagnosis.
Compared with prior art, the beneficial effects of the invention are as follows：
Voltage dip information and the letter of feed terminal unit that the present invention is provided using a few electric energy quality monitoring point
Breath, realizes the accurate fault location of Complicated Distribution Network.For branched line is more, baroque actual power distribution network, it is determined
Position result is more accurate, is not influenceed by branch line, and result is influenceed smaller by grounding resistance, load model, fault type, is had
Beneficial to actual distribution network failure line walking time, customer outage hours are shortened, so as to improve distribution network reliability index.Based on voltage
Temporarily the Complicated Distribution Network Fault Locating Method of drop information has stronger fit for baroque power distribution network in actual applications
Answering property and robustness.
Brief description of the drawings
Fig. 1 is the Complicated Distribution Network Fault Locating Method design flow diagram based on voltage dip information
Embodiment
The principle and specific execution method of the present invention are described below in conjunction with accompanying drawing.
As shown in figure 1, the Complicated Distribution Network Fault Locating Method based on voltage dip information, its idiographic flow includes：
(1) failure reported using feed terminal unit is crossed stream information and primarily determines that fault section；
(2) current vector information localization of faults short circuit current flow amount in the failure of feed terminal unit upload is utilized；
(3) the voltage dip information and system node impedance matrix uploaded using each monitoring point calculates trouble point short circuit current flow
Amount；
(4) each node in Ergodic Theory, calculates short circuit current flow deviation, determines malfunctioning node.
The step (1) includes：
Using matrix algorithm, the failure reported using feed terminal unit crosses stream information formation fault message vector, with retouching
The network Description Matrix for stating distribution net topology is combined, and calculating obtains fault verification matrix, so that fault section is primarily determined that, by event
Hinder range shorter between two terminals.
The step (2) includes：
Power distribution network is divided into several sections according to block switch and FTU position, will be divided with the FTU of each section direct neighbor
For two classes, a class electric current flows into the section from FTU, and another kind of electric current flows out the section from FTU.Determine after fault section, ignore
The influence of fault section internal loading electric current in failure process, estimation obtains the actual short-circuit current value in trouble point.
The step (3) includes：
Accident analysis is carried out to each node in the section, it is assumed that failure occurs in each node, utilizes the electricity of each monitoring point
Vector information is pressed, the fault curre for obtaining each node is calculated.
The step (4) includes：
All nodes in fault section are traveled through, by obtained fault current vector and the reality using the calculating of FTU information
Fault current is contrasted, and the minimum node of error is to be considered real malfunctioning node.
In the present invention, the step (1) is accomplished in the following manner：
According to the topology of power distribution network, using each FTU mount points as corresponding node, the network description of description network structure is formed
Matrix M, its dimension is the quantity of installation FTU in network, when there is feeder line between node i and node j, corresponding element Mij、
MjiFor 1, remaining element is 0；After power distribution network breaks down, the failure uploaded according to FTU crosses stream information formation fault message square
Battle array G, if the FTU at node does not flow through the fault current more than given threshold in advance, its corresponding diagonal element GiiFor
1, remaining element is 0.For the radial distribution networks network of single supply, when it breaks down, if the FTU being connected with section is existing
Flow through fault current and have again and do not flow through fault current, then the section is fault section.Therefore, by network Description Matrix M and event
Barrier information matrix G, which is multiplied, obtains fault verification matrix Q, and it is carried out can failure judgement section after normalization processing.
In the present invention, the step (2) is accomplished in the following manner：
It is two classes that FTU with each section direct neighbor, which is divided to, and a class electric current flows into the section from FTU, flows through such FTU's
Electric current is designated as I in failurei；Another kind of electric current flows out the section from FTU, flows through electric current in such FTU failure and is designated as Ij.Calculate
The formula of trouble point short circuit current flow is during physical fault：
In formula, IfeFor fault current vector approach, N1、N2Respectively with for the section adjacent first kind, Equations of The Second Kind FTU
Quantity.
In the present invention, the step (3) is accomplished in the following manner：
After power distribution network breaks down, equivalent to adding an Injection Current-I at the f of trouble pointf, can be by failure
Power distribution network be divided into two parts, therefore, the magnitude of voltage in network at any node can be divided into two parts, normal component and therefore
Hinder component, as shown in formula：
In formula：UiFor the voltage vector in failure at node i, Ui (0)For the voltage vector before failure at node i, ZifFor section
Mutual impedance at point i and trouble point f, IfFor fault current vector, N is the nodes in network.ZifOff-line calculation can be passed through
The nodal impedance matrix of network is obtained, and is obtained after nodal impedance matrix, and each monitoring point event is obtained using electric energy quality monitoring system
Voltage vector U before barrier and in failurei (0)、Ui, you can calculate the fault current vector obtained at malfunctioning node.
In the present invention, the step (4) is accomplished in the following manner：
After section where the localization of faults, accident analysis is carried out to each node in the section, it is assumed that failure occurs each
Node, can obtain the fault curre of each node, by obtained fault current vector and the failure electricity using the calculating of FTU information
Stream contrast, the minimum node of error is to be considered real malfunctioning node.Defining current vector deviation is：
In formula：δkThe fault current average value and physical fault current deviation vector obtained for k-th of node failure of hypothesis
Mould, IfkmTo assume k-th of node failure, the fault current obtained by m-th of monitoring point voltage dip information, NnodeFor event
Hinder the total node number in section, NmFor the total number of electric energy quality monitoring point.
Obtain all δkAfterwards, the node corresponding to its minimum value is the malfunctioning node for being output as fault diagnosis.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in
Within protection scope of the present invention.
Claims (5)
1. the Complicated Distribution Network Fault Locating Method based on voltage dip information, it is characterised in that comprise the following steps：
Step 1, the failure reported using feed terminal unit are crossed stream information and primarily determine that fault section；
Power distribution network is divided into several sections according to block switch and FTU position, the failure mistake reported using feed terminal unit
Stream information formation fault message vector, is combined, calculating obtains fault verification square with the network Description Matrix for describing distribution net topology
Battle array, so as to primarily determine that fault section, fault coverage is narrowed down between two terminals；
Current vector information localization of faults short circuit current flow amount in step 2, the failure uploaded using feed terminal unit；Will with it is each
It is two classes that the FTU of section direct neighbor, which is divided to, and a class electric current flows into the fault section from FTU, and another kind of electric current flows out the event from FTU
Hinder section；Determine after fault section, ignore the influence of fault section internal loading electric current in failure process, it is real that estimation obtains trouble point
The fault current vector on border；
Step 3, the voltage dip information and system node impedance matrix for utilizing each monitoring point upload in electric energy quality monitoring system
Calculate trouble point fault current vector；Accident analysis is carried out to each node in the fault section：It is assumed that failure occurs in each section
Point, the fault current vector for obtaining each node is calculated using the voltage dip information of each monitoring point；
Step 4, each node traveled through in the fault section, by obtained fault current vector and the reality using the calculating of FTU information
Border fault current vector contrast, calculates the vectorial deviation of fault current, i.e. the minimum node of the vectorial deviation of fault current is to recognize
To be real malfunctioning node.
2. the Complicated Distribution Network Fault Locating Method according to claim 1 based on voltage dip information, it is characterised in that
The step (1) is accomplished in the following manner：
According to the topology of power distribution network, using each FTU mount points as the corresponding boundary node of fault section, description network structure is formed
Network Description Matrix M, its dimension is the quantity that FTU is installed in network, when there is feeder line between node i and node j, correspondence
Element Mij、MjiFor 1, remaining element is 0；After power distribution network breaks down, the failure uploaded according to FTU is crossed stream information and formed
Fault message matrix G, if the FTU at node does not flow through the fault current more than given threshold in advance, its is corresponding right
Angle element GiiFor 1, remaining element is 0；For the radial distribution networks network of single supply, when it breaks down, if with section phase
FTU even is existing to be flowed through fault current and has again and do not flow through fault current, then the section is fault section；Therefore, network is retouched
State matrix M and be multiplied with fault message matrix G and obtain fault verification matrix Q, it is carried out can failure judgement after normalization processing
Section.
3. the Complicated Distribution Network Fault Locating Method according to claim 2 based on voltage dip information, it is characterised in that
The step (2) is accomplished in the following manner：
FTU with fault section direct neighbor is divided to for two classes：One class electric current flows into the fault section from FTU, flows through such FTU
Failure in current vector be designated as Ii；Another kind of electric current flows out the fault section from FTU, flows through electric current in such FTU failure
Vector is designated as Ij；The formula of trouble point short-circuit current value is when calculating physical fault：
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Quantity.
4. the Complicated Distribution Network Fault Locating Method according to claim 1 based on voltage dip information, it is characterised in that
The step (3) is accomplished in the following manner：
After power distribution network breaks down, equivalent to adding an Injection Current-I at the f of trouble pointf, so as to by failure
Power distribution network is divided into two parts, therefore, and the magnitude of voltage in network at any node can be divided into two parts：Normal component and failure
Component, as shown in formula：
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In formula：UiFor the voltage vector in failure at node i, Ui (0)For the voltage vector before failure at node i, ZifFor node i with
Mutual impedance at the f of trouble point, IfFor fault current vector, N is the nodes in network；ZifPass through the node of off-line calculation network
Impedance matrix is obtained, and is obtained after nodal impedance matrix, is obtained using electric energy quality monitoring system before each monitoring point failure and failure
In voltage vector Ui (0)、Ui, you can calculate the fault current vector obtained at malfunctioning node.
5. the Complicated Distribution Network Fault Locating Method according to claim 1 based on voltage dip information, it is characterised in that
The step (4) is accomplished in the following manner：
After section where the localization of faults, accident analysis is carried out to each node in the fault section：It is assumed that failure occurs each
Node, so that the fault current vector of each node is obtained, by obtained fault current vector and the failure using the calculating of FTU information
The minimum node of current vector comparing calculation current vector deviation, i.e. current vector deviation is to be considered real failure section
Point, defining current vector deviation is：
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In formula：δkThe fault current average value and physical fault current deviation vector field homoemorphism obtained for k-th of node failure of hypothesis,
IfkmTo assume k-th of node failure, the fault current vector obtained by m-th of monitoring point voltage dip information, NnodeFor failure
Total node number in section, NmFor the total number of electric energy quality monitoring point；
Obtain all δkAfterwards, the node corresponding to its minimum value is the malfunctioning node for being output as fault diagnosis.
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| CN108931709A (en) * | 2018-07-24 | 2018-12-04 | 华北电力大学 | A kind of distribution network fault location method of high serious forgiveness |
| CN110133450A (en) * | 2019-06-19 | 2019-08-16 | 山东大学 | Fault Locating Method and system based on distribution subregion equivalence |
| CN110161355A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of method for locating single-phase ground fault and device |
| CN110596528A (en) * | 2019-08-23 | 2019-12-20 | 国网山东省电力公司寿光市供电公司 | Power distribution network fault positioning method and system based on unified matrix algorithm |
| CN110658419A (en) * | 2019-10-10 | 2020-01-07 | 石家庄科林电气股份有限公司 | Micro-grid fault positioning method based on incomplete information |
| CN111426915A (en) * | 2020-05-11 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Distributed small current ground fault positioning method |
| CN113009276A (en) * | 2021-03-04 | 2021-06-22 | 国网宁夏电力有限公司电力科学研究院 | Intelligent power distribution network fault positioning method based on impedance matrix |
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| CN107894554A (en) * | 2017-11-23 | 2018-04-10 | 国网山东省电力公司枣庄供电公司 | Electrical power distribution network fault location method based on monitoring node voltage change |
| CN108931709A (en) * | 2018-07-24 | 2018-12-04 | 华北电力大学 | A kind of distribution network fault location method of high serious forgiveness |
| CN110161355A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of method for locating single-phase ground fault and device |
| CN110133450A (en) * | 2019-06-19 | 2019-08-16 | 山东大学 | Fault Locating Method and system based on distribution subregion equivalence |
| CN110596528A (en) * | 2019-08-23 | 2019-12-20 | 国网山东省电力公司寿光市供电公司 | Power distribution network fault positioning method and system based on unified matrix algorithm |
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| CN111426915A (en) * | 2020-05-11 | 2020-07-17 | 云南电网有限责任公司电力科学研究院 | Distributed small current ground fault positioning method |
| CN113009276A (en) * | 2021-03-04 | 2021-06-22 | 国网宁夏电力有限公司电力科学研究院 | Intelligent power distribution network fault positioning method based on impedance matrix |
| CN113884811A (en) * | 2021-10-08 | 2022-01-04 | 邓朝尹 | Distribution network line short-circuit fault positioning method based on straight algorithm |
| CN113884811B (en) * | 2021-10-08 | 2024-04-19 | 邓朝尹 | Distribution network line short-circuit fault positioning method based on straight algorithm |
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