LU502868B1 - Power distribution network line fault positioning method and system - Google Patents
Power distribution network line fault positioning method and system Download PDFInfo
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- LU502868B1 LU502868B1 LU502868A LU502868A LU502868B1 LU 502868 B1 LU502868 B1 LU 502868B1 LU 502868 A LU502868 A LU 502868A LU 502868 A LU502868 A LU 502868A LU 502868 B1 LU502868 B1 LU 502868B1
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The method comprises the following steps: obtaining the current from a node M on a section M of a power distribution network line to an upstream node M-1 and a downstream node M+1 when the line has a fault; obtaining an upstream estimation voltage and a downstream estimation voltage of the node M according to the current and the impedance of the corresponding section; judging whether the difference value between the upstream voltage and the actually measured voltage of the node M and the difference value between the downstream voltage and the actually measured voltage of the node M+1 are smaller than a preset first threshold value or not; if so, judging that the fault point is in the section M; and if not, re-selecting the node M in the line on one side of the node M of which the difference value is greater than the threshold value.
Description
DESCRIPTION LU502868
Power distribution network line fault positioning method and system
The present invention relates to the technical field of power distribution network fault detection, and in particular, to a power distribution network line fault positioning method and system.
A power distribution network is a network composed of overhead lines, cables, towers, distribution transformers, isolation switches, reactive compensators, some accessory facilities and the like, and plays an important role in distributing power in a power grid. The distribution network is an important public infrastructure of national economy and society development, no matter national life or factory production, scientific research does not require power supply, and power distribution network line faults can have non-negligible impact on people's life and work. Therefore, if there is a fault in the protection circuit, it is necessary to detect the fault in time, and to accurately position and estimate the fault as much as possible to schedule and overhaul the control center to provide a reliable reference.
However, since many lines in the power distribution network are accessed in the form of cables, the manpower, time and financial resources of cable fault maintenance are often on the order of thousands of meters, so if the length of a single feeder in the distribution network is often on the order of thousands of meters, if the overall maintenance is poor in economy, if the reference information of the fault position can be obtained when the fault is judged, only a certain range near the position needs to be overhauled, and a large amount of time and manpower can be saved.
In addition, if the fault occurs, other fault features, such as the current voltage of each phase of the fault point, can be calculated, so that the control center can make a pre-analysis and judgment on the type of the fault and the cause of the fault according to the characteristic quantities during maintenance, so that the control center has guiding significance for maintenance faults and subsequent prevention.
The invention provides a power distribution network line fault positioning method and systerhJ502868 which are used for solving the defect that the fault position cannot be quickly positioned in the prior art, realizing the positioning of the power distribution network line fault position, and providing data support for analysis of the fault type and the occurrence reason.
The present invention provides a power distribution network line fault positioning method, comprising: when a fault occurs in a power distribution network line, obtaining a current between a node m on a section m on a power distribution network line and an upstream node m — 1 and a downstream node m +1 of the node m, respectively; obtaining an upstream-side estimated voltage and a downstream-side estimated voltage of the node
M respectively according to the current and the impedance of the corresponding section; determining whether the difference between the estimated voltage of the upstream side and the measured voltage of the node M and the measured voltage of the downstream side estimation voltage and the node M +1 is less than a preset first threshold; if yes, determining that the fault point is within the section M; if not, re-selecting the node M in the line at one side of the node M whose difference is greater than the threshold, wherein, the segment refers to each cut line divided into the power distribution network line by setting a node at the power distribution network line.
According to the power distribution network line fault positioning method provided by the present invention, when a fault occurs in a power distribution network line, a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M is acquired, specifically comprising: acquiring the current of each node on the power distribution network line according to a predetermined period; determining whether the sum of the currents of each node is greater than a preset setting value; if yes, determining that the power distribution network line has a fault, and respectively acquiring the current between the node M and the upstream node M-1 and the downstream node M +1 of the node M;
if not, determining that the power distribution network line has no fault, and calculating th&/502868 impedance of each section on the power distribution network line; obtaining the total impedance of the power distribution network line by using the impedance of each section, determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, and waiting for the next period to re-acquire the current of each node on the power distribution network line.
According to the power distribution network line fault positioning method provided by the present invention, the calculating the impedance of each section on the power distribution network line specifically comprises: acquiring a current and a voltage of a node of each section on the power distribution network line, respectively; obtaining the impedance of the segment where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
According to the power distribution network line fault positioning method provided by the present invention, the method further includes: determining a specific position of the point C on the section
M, and determining a specific position of the point C on the section M comprises: selecting a point C in the section M, respectively acquiring an upstream side impedance of the point C from the node M and a current from the node M to the point C, and obtaining an estimated voltage of the upstream side of the point C according to the upstream side impedance of the point
C and the current from the node M to the point C; respectively obtaining the downstream side impedance of the point C from the node M +1 and the current from the node M +1 to the point C, and obtaining the estimated voltage on the downstream side of the point C according to the downstream side impedance of the point C and the current from the node M +1 to the point C; determining whether a difference between the estimated voltage at the upstream side of the point
C and the estimated voltage on the downstream side of the point C 1s less than a preset second threshold; if yes, determining that the point C is a fault point; and if not, re-selecting the point C in the section M.
According to the power distribution network line fault positioning method provided by the preseht/502868 invention, it is determined that the specific position of the point C on the section M specifically comprises: obtaining a first voltage difference between the upstream side estimated voltage of the point C and the measured voltage of the node M, or a second voltage difference between the estimated voltage of the downstream side of the point C and the measured voltage of the node M +1;
Based on the first voltage difference, the current at the node M to the point C and the impedance of the segment M, or the second voltage difference, the current at the node M +1 to the point C and the impedance of the segment M, the position of the point C on the segment M is obtained.
According to the power distribution network line fault positioning method provided by the present invention, the determining point C is a fault point, and further comprises:
According to the position of the point C on the section M, and the position of the node M and the node M +1 on the power distribution network line, the position of the point C on the distribution network line is obtained.
The invention further provides a power distribution network line fault positioning system. The power distribution network line fault positioning system is applied to the power distribution network line fault positioning method. The power distribution network line fault positioning system comprises: a data acquisition unit, configured to respectively acquire a current between a node M on a section
M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M when a power distribution network line fails; a data processing unit, configured to respectively obtain an upstream-side estimated voltage and a downstream-side estimated voltage of the node m according to the current and the impedance of the corresponding section; and a fault positioning unit, configured to determine whether a difference between the upstream side estimation voltage and the measured voltage of the node M and the measured voltage of the downstream side estimation voltage and the node M +1 is less than a preset first threshold; if yes,
determine that the fault point is within the section M; if not, re-select the node M in the line at ohé/502868 side of the node M whose difference is greater than the threshold; wherein, the segment refers to each cut line divided into the power distribution network line by setting a node at the power distribution network line.
The present disclosure further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the power distribution network line fault positioning method described above are implemented.
The present disclosure further provides a non-transitory computer readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the power distribution network line fault positioning method described above are implemented.
The present disclosure further provides a computer program product, including a computer program, wherein when the computer program is executed by a processor, the steps of the power distribution network line fault positioning method according to any one of the above embodiments are implemented.
According to the power distribution network line fault positioning method and system provided by the present invention, after the power distribution network line is divided into a plurality of sections through the nodes on the line, the predicted voltages of the upstream side and the downstream side of the target section are obtained by taking sections as units, and whether the fault point is on the target section can be determined according to the comparison of the predicted voltage and the measured voltage, thereby achieving the positioning of the fault on the power distribution network line, and greatly reducing the manpower and time required for maintenance. at the same time, the predicted voltage and current at the fault section are obtained while the fault is located, and the control center can facilitate the control center to make a pre-analysis and judgment on the type of the fault and the cause of the fault by predicting the voltage and current, thereby further improving the maintenance efficiency.
Brief Description of Drawings LU502868
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
FIG. 1 is a schematic flowchart of a power distribution network line fault positioning method according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a power distribution network line accessing a distributed power supply DG or a load T according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a working process of performing line fault positioning by applying the power distribution network line fault positioning method provided by the present invention;
FIG. 4 is a schematic structural diagram of a power distribution network line fault positioning system according to the present disclosure; and
FIG. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
To make the objectives, technical solutions, and advantages of the present invention clearer, the following clearly and completely describes the technical solutions in the present invention with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
It should be noted that the power distribution network line fault positioning method and system provided by the present invention are applicable to common distribution network lines and distributed power distribution network lines. For a distributed distribution network line, inL&/502868 subsystem composed of a plurality of intelligent terminals, the master station periodically requests measurement information of each segment at the same moment from each slave station, and the master station collects the electrical data of all the nodes (the three-order component of the current voltage measured at the same moment). At this time, a specific algorithm is used in the main station to determine the operating state of the protection line according to the acquired data. If there is a fault in the protection circuit, it is necessary to detect the fault in time, and accurately position and estimate the fault as much as possible to schedule and overhaul the control center to provide a reliable reference. Based on this, the power distribution network line fault positioning method and system provided by the present invention are executed by taking each master station as a unit when being applied to a distributed power distribution network line, rather than performing centralized calculation on the global data by the control center, so that the advantages of distributed control and edge calculation are fully exerted, the overhead of computing resources and communication bandwidth is saved, and the effectiveness of fault positioning is effectively improved. Meanwhile, it should be noted that, when the power distribution network line fault positioning method according to the present invention is applied, it is assumed that the impedance at each position on the line is uniformly distributed.
A power distribution network line fault positioning method according to the present invention is described below with reference to FIG. 1. The method comprises the following steps: 101. when a fault occurs in a power distribution network line, obtaining a current between a node m on a section m on a power distribution network line and an upstream node M—1 and a downstream node M+1 of the node M, respectively;
It should be noted that, in the fault location of the power distribution network line, since most of the lines are connected in the form of a cable, the length of the cable is long, and the cable is overhauled gradually along the length of the cable, so that manpower, material resources and financial resources are very consumed, and the maintenance efficiency is low. Therefore, in the present invention, the power distribution network line is divided into a plurality of sections by taking the node as an endpoint, and the fault point is positioned on the section by taking the section as a unit.
It can be understood that, for the positioning of the power distribution network line fault, that isJ502868 finding the position of the fault point on the power distribution network line, as shown in FIG. 2, taking one T to access the distributed power supply DG or the load distribution network line as an example, the concept of accessing the distributed power supply DG or the load is taken as an example. Therefore, the concept of introducing the "segment" represents the part on the line. That is, the section is defined as the part of the line between two adjacent nodes. In addition, for more precise expression, even if the two nodes are connected in the same position, for example, the node 0 and the node 1, and the part with the length of 0 is referred to as a section, the node is sequentially numbered from the upstream to the downstream according to the topological position. As shown in FIG. 2, the distribution network line includes the node 0 to the node 4. Therefore, for two adjacent nodes, the label should be the node M and the node M+1 (0 <m < N-2). We refer to the section therebetween as the section M, where N represents the total number of nodes in the power distribution network line, the node located at the most upstream is 0, the downstream node is N—1, and the intermediate node is sequentially 1 to N—2 from upstream to downstream. 102. obtaining an upstream-side estimated voltage and a downstream-side estimated voltage of the node M respectively according to the current and the impedance of the corresponding section; 103. determining whether the difference between the estimated voltage of the upstream side and the measured voltage of the node m and the measured voltage of the downstream side estimated voltage and the node M+1 is less than a preset first threshold; if yes, proceeding to step 104; if not, proceeding to step 105; 104. determining that the fault point is in the section M; 105. The node M is re-selected in the line at one side of the node M whose difference value is greater than the threshold value, and the step 101 is returned.
It should be noted that, according to the Kirchhoff current law in the basic theory of the circuit, the total current flowing into one node is 0, namely:
Hi, i(t)}=0
Disr tr ) Formula 1 wherein i,(t) refers to the instantaneous value of the Lth branch of the N branch current flowing into a node at time t (the reference direction uniformly takes in or out). Further, the node can be popularized as a certain area, and all the currents flowing into the area are still establishedU502868
Therefore, for the distributed subsystem shown in FIG. 2, a closed area can be formed, so that each branch current flowing into the distributed sub-system is summarized to the master station by the master station and the slave station, respectively, and these currents conform to the Kirchhoff current law. Based on this, when there is no fault in the distribution network line, the total current flowing into each node and should be 0, and when a fault occurs, a short-circuit current Isnore (the reference direction is flowing out) will appear on the section where the fault occurs.
It can be understood that, in the segment M, the current flowing from the upstream segment of the upstream node M to the node M is the current injected by all the nodes upstream of the segment
M, namely M1 J; ç, the current flowing from the downstream segment of the downstream node
M +1 to the node M +1 is the current injected by all nodes downstream of the segment M, namely
SN 1 Ii x. As stated above, the above two expressions are conditional, ie, it is required that no fault occurs in the upstream (or downstream) region of the segment M, otherwise, the injection current becomes Yo; — Ignore (or EE fix — Îshortæ) > its value is not equal to the original value, and the K-sequence short-circuit current / short,k 15 not known.
If the injection current expression of the upstream and downstream adjacent segments of the segment M to the current segment is accurate (ie, no fault is upstream or downstream of the segment M). Then, taking the upstream as an example, the sequence voltages of node M-1 and node M are U M-—1,4 and Unk. Then use the voltage Um—1x of the M-1 node, the current between the node M-1 and the node M YM J; y and the impedance Ry,_; + JXm_— between node M-1 and node M, according to Ohm's law, the estimated voltage of node M (from the upstream side) can be obtained, and the estimated voltage of node M when there is no upstream node Taking the measured value, the estimated voltage on the upstream side of node M is obtained as: . Ü M=0
UK = Mk M-1 à ; Formula 2
Um-1k — (Rm-1 + JjXy-1) Zizo lix Otherwise
The obtained estimated voltage Uy x at the upstream side of the node M is equal to the actually measured voltage Uy , (theoretically, actually considering that the measurement error is not completely equal, but the value is very close) is that there is no fault on the upstream side of th&/502868 node M.
Similarly, for any node, the estimated voltage on the downstream side of the node M is: . Ü M=N-1
Un x = | . Mk N-1 i i Formula 3
Umsrke — (Rumer + JXm+1) Zicmer Lie Otherwise
Similarly, the condition that the downstream side estimated voltage U Mr of the node M obtained by the above formula is equal to the actually measured voltage Uy, theory is that there is no fault on the downstream side of the node M.
Specifically, if the estimated voltage of the upstream side Uy x of the upstream node M of the segment M is equal to the measured value Uy; thereof, and the estimated voltage Up, , of the downstream side of the downstream node M +1 is equal to the measured value Uy, of the downstream node M+1, it indicates that there is no fault in both the upstream and downstream of the segment M Therefore, if there is a fault on the distribution network line at this time, the fault can only be inside the segment M.
More specifically, in an actual power system, errors, noise, synchronization errors and the like of the mutual inductor may cause errors in actual measurement of current or voltage. Therefore, in the power distribution network line fault positioning method of the present invention, a first threshold is introduced, that is, a fault section M is obtained by minimizing an error between a predicted value and an actually measured value, that is, the fault section M may be obtained by optimizing the model 1 as follows: 2 ; „2 , , 2 minf(M) = > (Uk = Uma) + [Uhr — Üm+uxe] ) k=0
O<M<N—2 . Ü M=0
Ube = 4. Mk M-1 i . Formula 4
Um-1k — (Ry-1 + JjXy-1) Zizo lix Otherwise
Uni i M=N-1 LU502868
N-1 (u — (Ru+1 + JXM+1) > li otherwise i=M+1 wherein, Y2_o(|UL x UE + URL — Ümsrx|) is the sum of the squares of the deviations of the upstream (downstream) upstream node from the upstream (downstream) downstream of the segment M and the measured voltage, and the most likely fault area is obtained by taking the minimum value part.
Since the impedance of the power distribution network line may change along with the change of the environmental condition, and the power distribution network line may not be timed to access different DG or load, it is difficult for the power grid and the intervener to give an accurate access position. Therefore, the position parameter needs to be obtained in real time. Based on this, in an embodiment of the present invention, when a fault occurs in the power distribution network line, the current between the node M on the section M on the power distribution network line and the upstream node M — 1 and the downstream node M +1 of the node M 1s acquired, specifically comprising: acquiring the current of each node on the power distribution network line according to a predetermined period; determining whether the sum of the currents of each node is greater than a preset setting value; if yes, determining that the power distribution network line has a fault, and respectively acquiring the current between the node M and the upstream node M-1 and the downstream node M +1 of the node M; if not, determining that the power distribution network line has no fault, and calculating the impedance of each section on the power distribution network line; obtaining the total impedance of the power distribution network line by using the impedance of each section, determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, and waiting for the next period to re-acquire the current of each node on the power distribution network line.
It should be noted that, based on the Kirchhoffs law, and considering the influence of the aboké/502868 mentioned error factors, even when there is no fault in the power distribution network line, the sum of the currents of each node may not be 0. Therefore, in order to avoid impedance change caused by environmental factors, or new T accesses other DG or load, in the power distribution network line fault positioning method according to the present invention, real-time periodic fault detection is performed on the power distribution network line, thereby updating the position of each node in the power distribution network line and the impedance of each section in real time, so as to improve the accuracy of fault positioning.
Specifically, if the impedance of each section M is solved, the total impedance of the new path of the power distribution network is the sum of the impedance values of the sections, and the ratio of the impedance of each node to the total impedance can be indirectly calculated. Therefore, the positioning of the power distribution network line fault can be converted into solving the line impedance of each section.
More specifically, in the case of no failure, for segment 1, if the impedance is set as R; + jX;, the measured voltages of node 1 and adjacent upstream node 1 +1 are sum of all the injection currents of all nodes (including 1) or all nodes (including 1 +1) upstream of segment i, ie, the sum of all injection currents of all nodes (including I) or all nodes (including I +1) upstream of segment 1, namely Y!_o J, or XN, lg, the voltage estimation value of node i +1 can be inferred to be
Ux — (R; + jX)) Xing I, x from node i by using impedance and current information: and when the measured voltage of the node 1 +1 is equal to the actually measured voltage of the node 1 +1, it is the case of the actual impedance.
As described above, considering the measurement error and the like in reality, the measured voltage and the estimated voltage may not be completely equal, so that the impedance of the section i is determined according to the minimum error between the measured voltage and the estimated voltage, so that the optimization model 2 is obtained:
2 LU502868 2 i minf (R; Xi) = > Ui — (BR; + jX;) > lux = Ups k=0 1=0
R; > 0 Formula 5;
X; >0
Then, according to the optimization model 2, the impedance R; + j X; of the node i can be obtained respectively. According to the result of formula 5, the target parameters can be obtained:
N-1
R+jX =) RAIN i=0 0 i=0 a; = ZizolRutiXil i=12 .. N—1 Formula 6;
Xo IR;+jX7
Wherein R + jX is the total impedance of the power distribution network line; à;, i = 0,1, ..., N — 1 is the position information of each node, that is, the ratio of the distance between the node i to the upstream bus and the length of the whole line.
Further, when the result of the current period determination is that there is no fault in the section, the impedance of the power distribution network line and the position information of each node are updated by using the result of Formula 5 and Formula 6, otherwise, the fault is located by using the parameter of the last updated distribution network line.
It can be understood that, the impedance is equal to the voltage divided by the current. Therefore, when there is no fault in the power distribution network line, the impedance of each section may be calculated by calculating the measured values of the voltage and current of each section. Based on this, in another embodiment of the present invention, the calculating the impedance of each section on the power distribution network line specifically comprises: acquiring a current and a voltage of a node of each section on the power distribution network line, respectively; obtaining the impedance of the segment where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
It should be noted that the impedance of each section must be obtained on the basis of no failuké/502868 of the distribution network line.
Further, the length of the section is determined by the distance between adjacent nodes, and the length of the section of the section is longer for two nodes away from each other. Therefore, only the fault is located in the section. Although the efficiency can be greatly improved compared with the maintenance of the whole line for subsequent maintenance, a certain difficulty still exists. At the same time, for a distributed subsystem, the responsible range is mainly the electrical area between two adjacent buses of the distribution network feeder. If a T connection occurs, since the same current flows in different sections to different directions, it is difficult to realize that a specific fault point is difficult to implement. Based on this, the specific position of the fault point in the segment needs to be located. Therefore, in another embodiment of the present disclosure, the method for determining the specific position of the fault point in the segment M is further described, that is, the method includes: selecting a point C in the section M, respectively acquiring an upstream side impedance of the point C from the node M and a current from the node M to the point C, and obtaining an estimated voltage of the upstream side of the point C according to the upstream side impedance of the point
C and the current from the node M to the point C; respectively obtaining the downstream side impedance of the point C from the node M +1 and the current from the node M +1 to the point C, and obtaining the estimated voltage on the downstream side of the point C according to the downstream side impedance of the point C and the current from the node M +1 to the point C; determining whether a difference between the estimated voltage at the upstream side of the point
C and the estimated voltage on the downstream side of the point C 1s less than a preset second threshold; if yes, determining that the point C is a fault point; and if not, re-selecting the point C in the section M.
It should be noted that, since the fault section M has been determined, the current flowing into the current section by the upstream node M of the section is YI, I; , the current flowing into the current section by the downstream node M +1 is X, J; At the same time, since the fault occurs in the present section, that is, there is no fault on the outer side of the section, the aboké&/502868 two current expressions are accurate, and in the present section, the sum of the two currents is nonzero and is the fault current.
As shown in FIG. 2, by assuming that any point C in the segment M and the ratio of the distance between the point C to the upstream node M and the length of the segment M is lambda, the impedances of the upstream side and the downstream side of the point C in the segment can be obtained as lambdaA(Ry + jXm) and (1 — A)(Ry + J Xm) respectively.
It can be understood that if there is no fault between point C and upstream node M, the voltage at point C can be determined by the measured voltage Um Of upstream node M, upstream impedance
A(Ry + jXm) and node M to point C The current of X, 1x is estimated, and the estimated voltage (from the upstream side) is:
Ug, (AD) = Um — À (Ry + jXu) Xi fig Formula 7;
Similarly, when there is no fault between the point C and the downstream node M +1, the estimated voltage at the point C from the downstream side may also be obtained as:
U2) = Unt, — (1-24) (Ry +JjXum) py I dix Formula 8;
Specifically, at any point in the fault section M (the fault point is divided), the fault must be upstream or downstream, that is, the estimated voltages UE (4) and UP # (A) on the upstream and downstream sides of the fault, one of them must be inaccurate. For the fault point itself, there is no fault in the upstream and downstream, and the two estimated voltages are accurate. Therefore, the two estimated voltages are equal to the actual voltage at the fault point. That is, if and only if point C is the fault point, UE, (4) = UZ, (2).
Therefore, to locate the position of the fault point C in the fault section M, taking into account the influence of measurement errors and other factors, it is necessary to find the position with the smallest difference between the upstream and downstream estimated voltages.
More specifically, the determination of the location of the fault point can be calculated based d:/#502868
Ohm's law, so in another embodiment of the present invention, a method for determining the specific location of the fault point C on the section M is specifically described, including:
Obtain the first voltage difference between the estimated voltage on the upstream side of the point
C and the measured voltage of the node M, or the second voltage difference between the estimated voltage on the downstream side of the point C and the measured voltage of the node M+1;
According to the first voltage difference, the current from node M to point C and the impedance of the section M, or the second voltage difference, the current from node M+1 to point C and the impedance of the section M, the point C is obtained at position on segment M.
Specifically, based on Ohm's law, to determine the position of the fault point on the section M, the position À of the fault point on the section M can be obtained by constructing the optimization model 3 shown in Equation 9 below, namely: 2 ; . . 2 min f@) =) 108,0) = 02, k=0
M
UE, (A) = Upp — À (Ry + jXm) > [ix i=0
UE, (à) = Üm+ik -(1- MH, Ru +JXm) Dm [ix Formula 9 0<A<1
Further, after the position of the fault point on the segment M is determined, the position of the fault point on the whole power distribution network line is determined, which is more conducive to determining the accurate position of the fault point. Based on this, in another embodiment of the present invention, a method for determining the position of the fault point on the power distribution network line 1s specifically described, that 1s:
According to the position of the point C on the section M, and the position of the node M and the node M +1 on the power distribution network line, the position of the point C on the distribution network line is obtained.
It should be noted that, in this embodiment, the method for determining the position of the fa!}502868 point, that is, the position of the point C on the power distribution network line, uses the node positions alpha 1, i = 1,2. N — 1 and the section M where the fault occurs, to obtain the position of the fault point in the whole power distribution network line, that 1s, the ratio of the distance from the upstream bus to the line length:
Afatut = Myer — Am) + Zio; Formula 10
It can be understood that, the final optimization result A corresponds to ud (A) or ug # (4), which is the sequence voltage value of the fault point, and the current flowing into the segment M and
EN I, , are the sequence current value flowing out of the fault point. A data basis is provided for the analysis of the fault type and the fault reason to obtain the actual phase current and voltage of the fault point, thereby providing a data basis for the analysis of the fault type and the fault reason.
Specifically, the working process of performing line fault positioning by applying the power distribution network line fault positioning method according to the present invention is shown in
FIG. 3: 301. start detection: 302. obtaining the current of each node in the line; 303. judging whether the current of each node is greater than a preset setting value; if not, entering 304; if yes, entering 307; 304. solving the impedance of each section by using the optimization model 2; 305. obtaining the total impedance of the power distribution network line and the position of each node according to the impedance of each section; 306. when waiting for the next cycle, returning to step 302; 307. retrieving the previously calculated impedance and position information; 308. determining a fault section M by using the optimization model 1;
309. determining the position of the fault point on the section M by using the optimization model/502868 3; 310. sending the fault information to the upper level, 311. end flow.
According to the method of the present invention, by periodically detecting the power distribution network line, the problem of inaccurate fault detection and positioning caused by the change of the impedance of the power distribution network line along with environmental conditions and factors such as different DG or load on the power distribution network line can be solved, and the problem that the fault cannot be accurately positioned on the power distribution network line is solved, so that the problems that a large amount of manpower, material resources and financial resources are consumed during fault maintenance, and the efficiency is not high are solved, so that the maintenance efficiency is improved, and a relatively accurate data basis is provided for analysis of the type of the fault and the cause of the fault.
The power distribution network line fault positioning system provided by the present invention is described below with reference to FIG. 4. The power distribution network line fault positioning system described below and the power distribution network line fault positioning method described above may be referred to each other.
As shown in FIG. 4, the power distribution network line fault positioning system provided by the present invention comprises a data acquisition unit 410, a data processing unit 420 and a fault positioning unit 430,
The data acquisition unit 410 is configured to respectively acquire a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M when a power distribution network line fails.
The data processing unit 420 is configured to respectively obtain an upstream-side estimated voltage and a downstream-side estimated voltage of the node M according to the current and the impedance of the corresponding section.
The fault location unit 430 is configured to determine whether a difference between the upstream- side estimated voltage and the measured voltage of the node M and the measured voltage of the downstream-side estimated voltage and the node m +1 is less than a preset first threshold; if yds/502868 determine that the fault point is within the segment M; if not, re-select the node M within the line on one side of the node M whose difference value is greater than the threshold;
Wherein, the segment refers to each cut line divided into the power distribution network line by setting a node at the power distribution network line.
It should be noted that, according to the power distribution network line fault positioning system of the present invention, after the power distribution network line is divided into a plurality of sections through the nodes on the line, the predicted voltages of the upstream side and the downstream side of the target section are obtained by taking sections as units, and whether the fault point is on the target section can be determined according to the comparison of the predicted voltage and the measured voltage, thereby achieving the positioning of the fault on the power distribution network line, and greatly reducing the manpower and time required for maintenance. at the same time, at the same time of fault positioning, the predicted voltage and current at the fault section are obtained, and the control center can facilitate the control center to make a pre-analysis and judgment on the type of the fault and the cause of the fault. Further, the maintenance efficiency is further improved.
In a preferred embodiment, the data acquisition unit 410 further includes a current acquisition module and a fault determination module,
The current obtaining module is configured to obtain the current of each node on the power distribution network line according to a predetermined period.
The fault determination module is configured to determine whether the sum of the currents of each node is greater than a preset setting value; if yes, determine that the power distribution network line has a fault, and respectively obtain the current between the node M and the upstream node M- 1 and the downstream node M +1 of the node M; if not, determining that the power distribution network line has no fault, and calculating the impedance of each section on the power distribution network line; and obtaining the total impedance of the power distribution network line by using the impedance of each section, and after determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, waiting for the next period to re-acquiké/502868 the current of each node on the power distribution network line.
In a preferred embodiment, the fault judgment module further comprises a calculation module, and the calculation module is used for respectively acquiring the current and the voltage of the nodes of each section on the power distribution network line; and obtaining the impedance of the section where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
In a preferred embodiment, the fault positioning unit 430 further includes a data acquisition module and a fault point positioning module,
The data acquisition module is configured to acquire the upstream side impedance of the node M and the current from the node M to the point C in the segment M respectively, and obtain the estimated voltage on the upstream side of the point C according to the upstream side impedance of the point C and the current from the node M to the point C. and respectively acquiring the downstream side impedance of the point C from the node M +1 and the current from the node M +1 to the point C, and obtaining the estimated voltage on the downstream side of the point C according to the downstream side impedance of the point C and the current from the node M +1 to the point C; the fault point positioning module is configured to determine whether a difference between the estimated voltage at the upstream side of the point C and the estimated voltage on the downstream side of the point C is less than a preset second threshold; if yes, determine that the point C is a fault point; and if not, re-select the point C in the section M.
In a preferred embodiment, the fault point positioning module is further configured to obtain a first voltage difference between the upstream side estimated voltage of the point C and the measured voltage of the node M, or a second voltage difference between the estimated voltage at the downstream side of the point C and the measured voltage of the node M +1. and based on the first voltage difference, the current at the node M to the point C and the impedance of the segment M, or the second voltage difference, the current at the node M +1 to the point C and the impedance of the segment M, the position of the point C on the segment M is obtained.
In a preferred embodiment, the fault point positioning module is further configured to obtain thé/502868 position of the point C on the power distribution network line according to the position of the point
C on the section M and the position of the node M and the node M +1 on the power distribution network line.
According to the power distribution network line fault positioning system, by periodically detecting the power distribution network line, the problems of fault detection and inaccurate positioning caused by the change of the impedance of the power distribution network line along with environmental conditions and factors such as different DG or load on the power distribution network line can be solved. After the power distribution network line is segmented, the position of the fault point is specifically located on the fault section, so that the problem that the fault cannot be accurately positioned on the power distribution network line is solved, the problem that a large amount of manpower, material resources and financial resources are consumed during fault maintenance, and the efficiency is not high are solved, and the maintenance efficiency is improved.
Analysis of the type of fault and the cause of the fault provides a relatively accurate data basis.
FIG. S illustrates a schematic diagram of an entity structure of an electronic device. As shown in
FIG. 5, the electronic device may include a processor 510, a communications interface 520, a memory 530, and a communications bus 540. The processor 510, the communications interface 520, and the memory 530 communicate with each other through the communications bus 540. The processor 510 may invoke a logic instruction in the memory 530 to execute a power distribution network line fault positioning method. The method includes: when a fault occurs in a power distribution network line, respectively acquiring a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M. and respectively obtain an upstream-side estimated voltage and a downstream-side estimated voltage of the node M according to the current and the impedance of the corresponding section. determining whether the difference between the estimated voltage of the upstream side and the measured voltage of the node M and the measured voltage of the downstream side estimation voltage and the node M +1 is less than a preset first threshold; if yes, determining that the fault point is within the section M; and if not, re-selecting the node M in the line at one side of the node M whose difference is greater than the threshold. Wherein, the segment refers to each cut line divided into the power distribution network line by setting a node at the power distributid:/502868 network line.
In addition, the logic instructions in the memory 530 may be implemented in a form of a software functional unit and sold or used as an independent product, and may be stored in a computer- readable storage medium. Based on such an understanding, the technical solutions of the present disclosure essentially, or the part contributing to the prior art, or parts of the technical solutions may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the methods described in the embodiments of the present disclosure. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc.
In another aspect, the present disclosure further provides a computer program product, where the computer program product includes a computer program, the computer program may be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer can perform the power distribution network line fault positioning method provided by the foregoing methods, and the method includes: when a fault occurs in the power distribution network line, the current between the node M on the section M on the power distribution network line and the upstream node M-1 and the downstream node M +1 of the node
M is obtained respectively. respectively obtaining an upstream-side estimated voltage and a downstream-side estimated voltage of the node M according to the current and the impedance of the corresponding section; and determining the measured voltage of the upstream-side estimated voltage and the node M. and the difference between the estimated voltage of the downstream side and the measured voltage of the node M +1 is less than a preset first threshold; if yes, determining that the fault point is in the section M; and if not, re-selecting the node M in the line at one side of the node M whose difference value is greater than the threshold, wherein the section refers to dividing the distribution network line into each section line by setting the node at the power distribution network line.
In yet another aspect, the present disclosure further provides a non-transitory computer-readablé/502868 storage medium having a computer program stored thereon. The computer program, when executed by a processor, is implemented to perform the power distribution network line fault positioning method provided by the foregoing methods. The method includes: when a fault occurs in a power distribution network line, respectively acquiring a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M. obtaining an upstream-side estimated voltage and a downstream-side estimated voltage of the node M respectively according to the current and the impedance of the corresponding section; determining whether a difference between the upstream-side estimated voltage and the measured voltage of the node M and the measured voltage of the downstream-side estimated voltage and the node m +1 is less than a preset first threshold; and It is determined that the fault point is within the segment M If not, the node M is re-selected in the line on one side of the node M whose difference value is greater than the threshold.
The device embodiments described above are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. A person of ordinary skill in the art may understand and implement the present disclosure without creative efforts.
Through the description of the above embodiments, those skilled in the art may clearly understand that the embodiments may be implemented by means of software plus a necessary general hardware platform, and of course may also be implemented by hardware. Based on such an understanding, the above technical solution essentially, or the part contributing to the prior art, may be embodied in the form of a software product. The computer software product may be stored in a computer readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disc, etc. and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in the various embodiments or some parts of the embodiments.
Although the present disclosure has been described in detail with reference to the foregoit&/502868 embodiments, those skilled in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features thereof, and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure.
Claims (10)
1. À power distribution network line fault positioning method, comprising: obtaining a current between a node M on a segment M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M respectively when a fault occurs in a power distribution network line; obtaining an upstream-side estimated voltage and a downstream-side estimated voltage of the node m respectively according to the current and the impedance of the corresponding section; determining whether the difference between the estimated voltage of the upstream side and the measured voltage of the node M and the measured voltage of the downstream side estimated voltage and the node M +1 is less than a preset first threshold; if yes, determining that the fault point is in the section M; if not, re-selecting the node M in the line at one side of the node M whose difference is greater than the threshold; wherein the segment refers to each cut line divided into the distribution network line by setting a node at the power distribution network line.
2. The power distribution network line fault positioning method according to claim 1, wherein when a fault occurs in a power distribution network line, obtaining a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M respectively comprises: acquiring a current of each node on the power distribution network line according to a predetermined period; determining whether the sum of the currents of each node is greater than a preset setting value; if yes, determining that the power distribution network line has a fault, and respectively acquiring the current between the node M and the upstream node M-1 and the downstream node M +1 of the node M; if not, determining that the power distribution network line has no fault, and calculating the impedance of each section on the power distribution network line;
obtaining the total impedance of the power distribution network line by using the impedance b#502868 each section, determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, and waiting for the next cycle to re-acquire the current of each node on the power distribution network line.
3. The power distribution network line fault positioning method according to claim 2, wherein the calculating the impedance of each section on the distribution network line specifically comprises: acquiring a current and a voltage of a node of each section on the power distribution network line, respectively; obtaining the impedance of the segment where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
4. The power distribution network line fault positioning method according to claim 3, wherein after it is determined that the fault point is in the section M, it is further determined that the fault point is located at the position of the section M, specifically comprising: selecting a point C in the section M, respectively acquiring an upstream side impedance of the point C from the node M and a current from the node M to the point C, and obtaining an estimated voltage of the upstream side of the point C according to the upstream side impedance of the point C and the current from the node M to the point C; respectively acquiring the downstream side impedance of the point C from the node M +1 and the current from the node M +1 to the point C, and obtaining the estimated voltage on the downstream side of the point C according to the downstream side impedance of the point C and the current from the node M +1 to the point C; determining whether a difference between the estimated voltage at the upstream side of the point C and the estimated voltage on the downstream side of the point C 1s less than a preset second threshold; if yes, determining that the point C is a fault point; and if not, re-selecting the point C in the section M.
5. The power distribution network line fault positioning method according to claim 4, further comprising: determining a specific position of the point C on the section M, and determining the specific position of the point C on the section M specifically comprises:
acquiring a first voltage difference between the upstream side estimated voltage of the point C and/502868 the measured voltage of the node M, or a second voltage difference between the estimated voltage of the downstream side of the point C and the measured voltage of the node M +1; Based on the first voltage difference, the current at the node M to the point C and the impedance of the segment M, or the second voltage difference, the current at the node M +1 to the point C and the impedance of the segment M, the position of the point C on the segment M is obtained.
6. The power distribution network line fault positioning method according to claim 5, wherein determining the point C to be a fault point further comprises: obtaining the position of the point C on the distribution network line according to the position of the point C on the section M and the position of the node M and the node M +1 on the distribution network line.
7. A power distribution network line fault positioning system, the power distribution network line fault positioning system applying the power distribution network line fault positioning method according to claims 1-6, comprising: a data acquisition unit, configured to respectively acquire a current between a node M on a section M on a power distribution network line and an upstream node M — 1 and a downstream node M +1 of the node M when a power distribution network line fails; a data processing unit, configured to respectively obtain an upstream-side estimated voltage and a downstream-side estimated voltage of the node m according to the current and the impedance of the corresponding section; and a fault location unit, configured to determine whether the difference between the measured voltage of the upstream side estimated voltage and the measured voltage of the node M and the measured voltage of the downstream side estimated voltage and the node m +1 is less than a preset first threshold; if yes, determine that the fault point is within the section m; if not, re-select the node m within the line on one side of the node m whose difference is greater than the threshold; wherein the segment refers to each cut line divided into the distribution network line by setting a node at the power distribution network line.
8. An electronic device, comprising a memory, a processor, and a computer program stored on thé/502868 memory and executable on the processor, wherein the processor executes the program to implement the step of the power distribution network line fault positioning method according to any one of claims 1 to 6.
9. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the power distribution network line fault positioning method according to any one of claims 1 to 6.
10. A computer program product, comprising a computer program, wherein the computer program, when executed by a processor, implements the steps of the power distribution network line fault positioning method according to any one of claims 1 to 6.
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| CN113848431B (en) * | 2021-10-22 | 2022-11-22 | 广西电网有限责任公司电力科学研究院 | Power distribution network line fault positioning method and system |
| CN116047226B (en) * | 2023-02-01 | 2023-08-08 | 华远高科电缆有限公司 | Early warning cable detecting system |
| CN116008682B (en) * | 2023-03-22 | 2023-08-15 | 国网江西省电力有限公司电力科学研究院 | Real-time studying and judging method and system for distribution transformer high-voltage open-phase fault position |
| CN116503023B (en) * | 2023-05-06 | 2024-01-05 | 国网浙江省电力有限公司 | Power abnormality information checking method based on power marketing management system |
| CN116256602B (en) * | 2023-05-15 | 2023-07-11 | 广东电网有限责任公司中山供电局 | Method and system for identifying state abnormality of low-voltage power distribution network |
| CN116381563B (en) * | 2023-05-30 | 2023-08-11 | 菱亚能源科技（深圳）股份有限公司 | Underground power cable monitoring method and device |
| CN116540029B (en) * | 2023-06-27 | 2023-09-12 | 国网上海市电力公司 | Active power distribution network fault section positioning method and device based on node distortion correction |
| CN117011805B (en) * | 2023-10-07 | 2024-02-06 | 广东电网有限责任公司云浮供电局 | Data exception evaluation method, device, equipment and readable storage medium |
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| SE466366B (en) * | 1990-06-29 | 1992-02-03 | Asea Brown Boveri | PROCEDURE AND DEVICE MAKES COMMON LOCATION IN THE MULTI-TERMINAL |
| AT413447B (en) * | 2000-08-11 | 2006-02-15 | Adaptive Regelsysteme Ges M B | METHOD AND DEVICE FOR LOCATING SINGLE POULTRY EARTH ERRORS |
| RU2529773C1 (en) * | 2010-07-09 | 2014-09-27 | Сименс Акциенгезелльшафт | High-speed remote protection for power supply networks |
| CN104375055B (en) * | 2013-08-15 | 2017-05-17 | 通用电气公司 | Fault locating device and method of power distribution network |
| CN104155582B (en) * | 2014-08-29 | 2016-10-19 | 上海交通大学 | Distribution line fault section location method based on Full wave shape information |
| CN104316840A (en) * | 2014-11-07 | 2015-01-28 | 国家电网公司 | Positioning method and device for fault branches of mixed multi-branch nodes of power distribution network |
| CN107238779B (en) * | 2017-05-18 | 2019-10-11 | 国网山东省电力公司电力科学研究院 | A kind of fault distance-finding method of active power distribution network |
| CN109298289A (en) * | 2018-11-29 | 2019-02-01 | 广东电网有限责任公司 | Localization method, system and the electronic equipment of distribution network failure point |
| CN113433417B (en) * | 2021-05-08 | 2022-06-14 | 湖南大学 | Power distribution network fault positioning method and system based on measured voltage difference |
| CN113848431B (en) * | 2021-10-22 | 2022-11-22 | 广西电网有限责任公司电力科学研究院 | Power distribution network line fault positioning method and system |
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