CN110514965B - Multi-branch power distribution network fault positioning method using set matching method - Google Patents
Multi-branch power distribution network fault positioning method using set matching method Download PDFInfo
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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
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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 invention relates to a multi-branch power distribution network fault positioning method using a set matching method, and belongs to the technical field of relay protection of power systems. Firstly, determining the number of set elements by the number of branch nodes, setting three working modes for a feeder unit terminal (FTU) device, and adding the working mode values of FTUs of lines connected with the branch nodes by considering the fault current direction to form a set lz，lzEach element in the set is the sum of the working mode values of FTUs of lines connected with different branch nodes; then, different section and branch faults are simulated in sequence, and corresponding fault judgment L is establishedg(ii) a And finally, establishing a fault set l according to information uploaded by the FTU to the master station systemzfJudging L at the fault by using a matching methodgTo a corresponding set lxThe faulty segment line and the branch line can be judged.
Description
Technical Field
The invention relates to a multi-branch power distribution network fault positioning method using a set matching method, and belongs to the technical field of relay protection of power systems.
Background
The fault of the power distribution network is quickly and accurately positioned, so that the fault line is isolated, the power supply is quickly recovered, and the operation reliability of the power distribution network can be improved. The multi-branch power distribution network is complex in structure and difficult to locate faults, particularly, the rural multi-branch power distribution network is complex and variable in natural conditions, high in fault occurrence probability and difficult to find faults, the insulation value of a line is required to be manually telemetered, faults are found in one section, the fault removing time is prolonged, the sustainable power supply time is shortened, and economic loss is brought. Although the specific fault position can be calculated by utilizing the traveling wave method for fault positioning, the method has the advantages of higher response speed and higher ranging precision, for a multi-branch power distribution network, the number of traveling wave devices required to be arranged is large, the investment cost is high, and if the traveling wave single-end method or double-end method is utilized for fault positioning, the first wave head of a fault and the transmitted wave of the fault point in the multi-branch power distribution network are complex and difficult to identify. The FTU is gradually popularized, the fault location of the power distribution network based on a matrix algorithm is provided, a fault information matrix is constructed by combining FTU uploading information and element equipment, and a fault section is located according to a criterion, but the matrix algorithm has high dimension and complex criterion. In addition, the efficiency of fault location is improved by introducing various artificial intelligence algorithms to different degrees, the calculation amount is large, the programming is complex, and the method is not simple and rapid enough.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-branch power distribution network fault positioning method using a set matching method, so as to solve the technical problem.
The technical scheme of the invention is as follows: a multi-branch distribution network fault location method using set matching method includes determining number of set elements by number of branch nodes, setting three working modes for feeder unit terminal (FTU), adding FTU working mode values of branch node connection lines in consideration of fault current direction to form set lz，lzEach element in the set is the sum of the working mode values of FTUs of lines connected with different branch nodes; then, different section and branch faults are simulated in sequence, and corresponding fault judgment L is establishedg(ii) a And finally, establishing a fault set l according to the information uploaded to the main station system by the feeder unit terminalzfJudging L at the fault by using a matching methodgTo a corresponding set lxThe faulty segment line and the branch line can be judged.
The method comprises the following specific steps:
step 1: determining the number of elements in the set, and determining the number of the elements in the set by taking the number of the line branch nodes along the line branch number;
step 2: considering the fault current direction, setting an FTU working mode and a multi-branch multi-power-supply power distribution network; if the fault current direction is a positive direction, the FTU works in a mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the feeder unit terminal works in a mode 0, and the corresponding mode value is 0; the work mode of the FTU of the tail end line of the multi-branch single-power-supply distribution network is set to be 2, -1 and 0, the fault current direction is a positive direction, the FTU works in a mode 2, and the corresponding mode value is 2; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU works in a mode 0, and the corresponding mode value is 0; the working mode of a non-terminal line FTU of the multi-branch single-power distribution network is the same as that of the multi-branch multi-power distribution network;
step 3: adding the working mode values of the branch node-connected line FTU to form a set lz，lzEach element value in the set is the sum of the working mode values of FTUs (fiber to the Unit) of the lines connected with different branch nodes, and the sum can be obtained by using the following formulas (1) and (2):
lz＝{N1,N2,N3,...,Nn} (1)
in the formula, N1、N2、...、NnThe sum of the working mode values of the FTU devices of the circuits connected with the nodes 1, 2, · and N respectively; n is1、n2、...、n3n+2Respectively corresponding mode values of all FTUs on the circuit; lzWhen the signal value is 0, the circuit works normally;
step 4: establishing a failure determination LgSimulating different section faults and branch faults including multiple faults, and obtaining a fault judgment L containing m set elements according to Step3g：
Lg＝{l1,l2,l3,...,lx,lm} (3)
Step 5: judging the fault section line and the branch line, uploading information to the master station system by the feeder terminal unit FTU after the fault occurs, and obtaining a fault set l according to Step3zfAnd according to the formula (3), judging by using a matching method:
if lzf＝lx，
The faulty segment line and the branch line can be found.
The invention has the beneficial effects that:
(1) constructing a fault set l by using information uploaded to a main station system by a Feeder Terminal Unit (FTU)zfThe matching method is combined again to judge the fault LgIn the corresponding set lxThe method has the advantages of few adopted elements, simple programming, small occupied memory and easy realization, and improves the efficiency of fault location.
(2) Using fault sets lzfMatch failure determination LgGet the corresponding set lxThe method for identifying the fault section line and the branch line can accurately identify the fault section line and the branch line for faults of the multi-branch single-power distribution network or the multi-branch multi-power distribution network, reduces manual line patrol time, and quickly recovers power supply, so that the power supply reliability of the distribution network is improved, and economic loss is reduced.
Drawings
FIG. 1 is a diagram of a multi-branch dual power distribution network of the present invention;
FIG. 2 is a multi-branch dual power line fault determination L of the present inventiong1An aggregate graph;
fig. 3 is a diagram of a multi-branch single power distribution network of the present invention;
FIG. 4 is a multi-branch single power line fault determination L of the present inventiong2And (4) collecting the graphs.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1: a multi-branch dual power distribution network as shown in figure 1 is established. The positive direction of the current is shown in fig. 1, A, B is a line bus bar, a black solid dot is a feeder unit terminal (FTU), l1To l7Respectively, a segment line and a branch line, and the branch nodes are respectively marked as node 1, node 2, node 3, n1To n11And the working mode value is corresponding to the FTU. Existing section l2Line and branch l7A line fault.
(1) According to the specification, Step 1: determining a set lzNumber of medium elements, number of branch nodes along the linezThe number of the medium elements is 3;
(2) according to the specification, Step 2: and setting the FTU working mode of the feeder unit terminal, considering the fault current direction, and setting the FTU working mode to be 1, -1 and 0 for the multi-branch dual-power distribution network. If the fault current direction is a positive direction, the FTU works in a mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU operates in the mode 0, and the corresponding mode value is 0.
(3) According to the specification, Step 3: form a set lz：
lz＝{N1,N2,N3,...,Nn} (1)
(4) According to the specification, Step 4: establishing a failure determination LgSimulating different section and branch faults, including multiple faults, to obtain a fault decision L containing 39 setsg1As shown in fig. 2.
(5) According to the specification, Step 5: after a line fails, a feeder terminal unit FTU uploads information to a master station system to obtain a failure set l zf2, -2, -3; by means of a matching method, ifzf＝l2-l7，
The failure section is obtained as l2Line, fault branch is l7And (4) a line.
Example 2: a multi-branch single-power distribution network as shown in figure 1 is established. The positive direction of the current is shown in fig. 3, wherein A is a line bus, and a black solid dot is a feeder unit terminal (FTU), l1To l7Respectively, a segment line and a branch line, and the branch nodes are respectively marked as node 1, node 2, node 3, n1To n10And the working mode value is corresponding to the FTU. Existing section l3Line and branch l6A line fault.
(1) According to the specification, Step 1: determining a setlzNumber of medium elements, number of branch nodes along the linezThe number of the medium elements is 3;
(2) according to the specification, Step 2: setting a working mode of a feeder unit terminal FTU, considering the fault current direction, and setting the working mode of the FTU to be 1, -1 and 0 for a non-terminal line of the multi-branch single-power-supply distribution network; the working modes of the FTU are set to be 2, -1 and 0. The fault current direction of the non-terminal line is a positive direction, the FTU works in a mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU operates in the mode 0, and the corresponding mode value is 0. If the fault current direction of the tail-end line is a positive direction, the FTU works in a mode 2, and the corresponding mode value is 2; if the fault current direction is the reverse direction, the FTU operates in the mode-1, the corresponding mode value is-1, and if the line is normal, the FTU operates in the mode 0, and the corresponding mode value is 0.
(3) According to the specification, Step 3: form a set lz：
lz＝{N1,N2,N3,...,Nn} (1)
(4) According to the specification, Step 4: establishing a failure determination LgSimulating different section and branch faults including multiple faults to obtain fault judgment L containing 21 setsg2As shown in fig. 4.
(5) According to the specification, Step 5: after a line fails, a feeder terminal unit FTU uploads information to a master station system to obtain a failure set l zf4,4, 1; by means of a matching method, ifzf＝l3-l6，
The failure section is obtained as l3Line, fault branch is l6And (4) a line.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (2)
1. A multi-branch power distribution network fault positioning method using a set matching method is characterized in that: firstly, determining the number of set elements by the number of branch nodes, setting three working modes for an FTU device, and adding the working mode values of FTUs of lines connected with the branch nodes by considering the fault current direction to form a set lz，lzEach element in the set is the sum of the working mode values of FTUs of lines connected with different branch nodes; then, different section and branch faults are simulated in sequence, and corresponding fault judgment L is establishedg(ii) a And finally, establishing a fault set l according to the information uploaded to the main station system by the feeder unit terminalzfJudging L at the fault by using a matching methodgTo a corresponding set lxJudging a fault section line and a branch line;
the FTU working mode values are specifically set as follows: for a multi-branch dual-power distribution network, the working mode of the FTU is set to be 1, -1 and 0, the fault current direction is a positive direction, the FTU works in the mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU works in a mode 0, and the corresponding mode value is 0;
for a non-terminal line of a multi-branch single-power-supply distribution network, the working mode of an FTU is set to be 1, -1 and 0; the working mode of the FTU of the tail end circuit is set to be 2, -1 and 0; the fault current direction of the non-terminal line is a positive direction, the FTU works in a mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU works in a mode 0, and the corresponding mode value is 0; if the fault current direction of the tail-end line is a positive direction, the FTU works in a mode 2, and the corresponding mode value is 2; if the fault current direction is the reverse direction, the FTU operates in the mode-1, the corresponding mode value is-1, and if the line is normal, the FTU operates in the mode 0, and the corresponding mode value is 0.
2. The method for locating the fault of the multi-branch power distribution network by using the set matching method according to claim 1, which comprises the following specific steps:
step 1: determining the number of elements in the set, and determining the number of the elements in the set by taking the number of the line branch nodes along the line branch number;
step 2: considering the fault current direction, setting an FTU working mode, setting the FTU working mode of the multi-branch dual-power-supply distribution network to be 1, -1 and 0, and setting the fault current direction to be a positive direction, so that the FTU works in the mode 1, and the corresponding mode value is 1; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the feeder unit terminal works in a mode 0, and the corresponding mode value is 0; the work mode of the FTU of the tail end line of the multi-branch single-power-supply distribution network is set to be 2, -1 and 0, the fault current direction is a positive direction, the FTU works in a mode 2, and the corresponding mode value is 2; if the fault current direction is the reverse direction, the FTU works in a mode-1, and the corresponding mode value is-1; if the line is normal, the FTU works in a mode 0, and the corresponding mode value is 0; the working mode of a non-terminal line FTU of the multi-branch single-power distribution network is the same as that of the multi-branch multi-power distribution network;
step 3: adding the working mode values of the branch node-connected line FTU to form a set lz，lzEach element value in the set is the sum of the working mode values of FTUs (fiber to the Unit) of the lines connected with different branch nodes, and the sum can be obtained by using the following formulas (1) and (2):
lz＝{N1,N2,N3,...,Nn} (1)
in the formula, N1、N2、...、NnThe sum of the working mode values of the FTU devices of the circuits connected with the nodes 1, 2, · and N respectively; n is1、n2、...、n3n+2Respectively corresponding mode values of all FTUs on the circuit; lzWhen the signal value is 0, the circuit works normally;
step 4: establishing a failure determination LgSimulating different section faults and branch faults including multiple faults, and obtaining a fault judgment L containing m set elements according to Step3g：
Lg＝{l1,l2,l3,...,lx,lm} (3)
Step 5: judging fault section line and branch line, after fault, feeder terminal unit FTU uploads information to main station system to establish fault set lzfAnd according to the formula (3), judging by using a matching method:
if it is
The faulty segment line and the branch line can be found.
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