CN111060781A - Method and system for positioning power distribution network fault - Google Patents
Method and system for positioning power distribution network fault Download PDFInfo
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- CN111060781A CN111060781A CN201911410932.2A CN201911410932A CN111060781A CN 111060781 A CN111060781 A CN 111060781A CN 201911410932 A CN201911410932 A CN 201911410932A CN 111060781 A CN111060781 A CN 111060781A
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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
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- 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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- 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
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Abstract
The application provides a method and a system for positioning faults of a power distribution network, and relates to the field of ubiquitous power Internet of things. The method comprises the following steps: and the plurality of measurement and control points establish a fault state matrix under the condition that the power distribution network fails, and locate the fault point of the power distribution network where the fault occurs through the operation result of the fault state matrix and the normal matrix. According to the technical scheme, the power distribution network fault location and isolation method based on the ubiquitous power Internet of things is provided by combining the idea of edge calculation, the mode of power distribution network fault location is designed, required data are directly extracted from the measurement and control points, data exchange between the main control points and the measurement and control points is not needed, a large amount of calculation of the main control points is not needed, the fault points are quickly and efficiently located by using a matrix algorithm, the working efficiency of the main control points is improved, and the resources of the measurement and control points are fully utilized.
Description
Technical Field
The invention relates to the field of ubiquitous power Internet of things, in particular to a method and a system for positioning faults of a power distribution network.
Background
The construction project of the energy internet is actively developed, and in 2019, the national grid company puts forward the aim of constructing the ubiquitous power internet of things in two parties. The electric power internet of things is a network capable of realizing perception, interaction, connection and access of power grid facilities, workers and the environment where the electric power internet of things is located, fusion between information transmission equipment and information resources and mutual cooperation of all entities can be realized, objects and things are mutually controlled and communicated, a production and living framework with higher intelligent degree is constructed, and the concept of the ubiquitous electric power internet of things is derived from the characteristics.
At present, the defects of complex calculation, large calculation amount and large storage amount exist in the fault location and isolation of the power distribution network of the ubiquitous power internet of things, if the scale of the power grid is continuously enlarged, the data amount and the calculation amount stored by a server are greatly increased, the association between a master station (master control point) and each node (measurement and control point) is more complicated, and the probability of calculation errors is possibly increased.
Disclosure of Invention
In view of the above problems, the present invention provides a method and a system for power distribution network fault location, which solves the above problems.
The embodiment of the invention provides a method for positioning faults of a power distribution network, which is applied to a power distribution network system, wherein the power distribution network system comprises the following steps: the method comprises the following steps that a main control point and a plurality of measurement and control points are connected in a topological structure mode, and the method comprises the following steps:
the method comprises the following steps that a fault state matrix is established by the multiple measurement and control points under the condition that the power distribution network fails, and the fault state matrix represents the running state of the power distribution network when the power distribution network fails;
and the plurality of measurement and control points locate the fault point of the power distribution network with a fault according to the operation result of the fault state matrix and the normal state matrix, and the normal state matrix represents the running state of the power distribution network in normal running and the connection relation between the main control point and the plurality of measurement and control points.
Optionally, an element S in the normality matrixijThe values of (A) are as follows: 0 or 1; wherein i and j represent any two measurement and control points in the power distribution network;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is consistent with the positive direction, the value of the element Sij is 1, and the positive direction is the direction in which the current of the power distribution network flows out from a power supply;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is inconsistent with the positive direction, the value of the element Sij is 0;
and under the condition that the normal current of the measurement and control point i flows from the measurement and control point j to the measurement and control point i, the value of the element Sij is 0.
Optionally, values of the element Gii in the fault state matrix are: 0 or 1;
the measurement and control point i detects whether fault current exists or not;
under the condition that the measurement and control point i detects that the fault current exists in the measurement and control point i and the flow direction of the fault current is consistent with the positive direction, the value of the element Gii is 1;
and under the condition that the measurement and control point i detects that the fault current exists per se and the flow direction of the fault current is inconsistent with the positive direction, the value of the element Gii is 0.
Optionally, the positioning, by the multiple measurement and control points, the fault point occurring in the power distribution network according to the operation result of the fault state matrix and the normal state matrix includes:
the plurality of measurement and control points perform summation operation on the fault state matrix and the normal state matrix to obtain a fault judgment matrix;
the plurality of measurement and control points locate fault points of the power distribution network, which have faults, by using the fault judgment matrix and the fault location formula;
wherein the fault location formula comprises:
equation 1:
and equation 2:
the formula 1 is used for positioning whether a fault occurs between the measurement and control point i and the measurement and control point j, and PiiAn element P corresponding to the summation value of the measurement and control point i in the fault judgment matrixijThe element P corresponding to the summation value between the measurement and control point i and the measurement and control point j in the fault judgment matrixjjElements of the summation value corresponding to the measurement and control point j in the fault judgment matrix are obtained;
the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network.
Optionally, the step of locating the fault point where the power distribution network fails by using the fault determination matrix and the fault location formula by the multiple measurement and control points includes:
under the condition that elements in the fault judgment matrix meet the formula 1, the plurality of measurement and control points position fault points of the power distribution network, which have faults, between the measurement and control point i and the measurement and control point j;
and under the condition that the elements in the fault judgment matrix meet the formula 2, the plurality of measurement and control points position the fault point of the power distribution network with the fault at the measurement and control point i, wherein the measurement and control point i is the tail end measurement and control point.
Optionally, after the plurality of measurement and control points locate the fault point where the power distribution network fails, the method further includes:
when a fault point with a fault is between the measurement and control point i and the measurement and control point j, the measurement and control point i and the measurement and control point j both send fault alarm information, perform fault isolation operation and send fault positioning information and fault alarm information to the master control point;
under the condition that a fault point with a fault is at the measurement and control point i, the measurement and control point i sends fault alarm information, fault isolation operation is carried out, and fault positioning information and fault alarm information are sent to the main control point;
wherein the fault isolation operation comprises:
under the condition that a fault point with a fault is between the measurement and control point i and the measurement and control point j, the measurement and control point i and the measurement and control point j both execute switch tripping operation;
and under the condition that the fault point with the fault is at the measurement and control point i and the measurement and control point i is the tail end measurement and control point, the measurement and control point i executes the switch tripping operation.
The embodiment of the invention also provides a system for positioning the fault of the power distribution network, which comprises the following steps: the system comprises a main control point and a plurality of measurement and control points, wherein the main control point is connected with the plurality of measurement and control points in a topological structure mode, and all the measurement and control points in the plurality of measurement and control points comprise: establishing a fault state matrix module, an operation positioning module, a normal matrix element dereferencing module and a fault state matrix element dereferencing module; the master control point comprises: the method comprises the steps of receiving a determining module and controlling a closing module;
the fault state matrix establishing module is used for establishing a fault state matrix under the condition that the power distribution network fails, and the fault state matrix represents the running state of the power distribution network when the power distribution network fails;
the operation positioning module is used for positioning fault points of the power distribution network, which have faults, according to operation results of the fault state matrix and the normal state matrix, wherein the normal state matrix represents an operation state of the power distribution network in normal operation and a connection relation between the main control point and the plurality of measurement and control points.
Optionally, the normal matrix element value taking module is configured to calculate a value of an element in the normal matrix;
wherein an element S in the normality matrixijThe values of (A) are as follows: 0 or 1; wherein i and j represent any two measurement and control points in the power distribution network;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is consistent with the positive direction, the value of the element Sij is 1, and the positive direction is the direction in which the current of the power distribution network flows out from a power supply;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is inconsistent with the positive direction, the value of the element Sij is 0;
and under the condition that the normal current of the measurement and control point i flows from the measurement and control point j to the measurement and control point i, the value of the element Sij is 0.
Optionally, the failure state matrix element dereferencing module is configured to calculate dereferencing of elements in the failure state matrix;
the values of the elements Gii in the fault state matrix are: 0 or 1;
the measurement and control point i detects whether fault current exists or not;
under the condition that the measurement and control point i detects that the fault current exists in the measurement and control point i and the flow direction of the fault current is consistent with the positive direction, the value of the element Gii is 1;
and under the condition that the measurement and control point i detects that the fault current exists per se and the flow direction of the fault current is inconsistent with the positive direction, the value of the element Gii is 0.
Optionally, the operation positioning module includes:
the operation submodule is used for carrying out summation operation on the fault state matrix and the normal state matrix to obtain a fault judgment matrix;
the positioning sub-module is used for positioning a fault point of the power distribution network, which has a fault, by using the fault judgment matrix and the fault positioning formula;
wherein the fault location formula comprises:
equation 1:
and equation 2:
the formula 1 is used for positioning whether a fault occurs between the measurement and control point i and the measurement and control point j, and PiiAn element P corresponding to the summation value of the measurement and control point i in the fault judgment matrixijThe element P corresponding to the summation value between the measurement and control point i and the measurement and control point j in the fault judgment matrixjjElements of the summation value corresponding to the measurement and control point j in the fault judgment matrix are obtained;
the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network.
Optionally, the positioning sub-module comprises:
the first positioning slave module is used for positioning a fault point of the power distribution network, which has a fault, between the measurement and control point i and the measurement and control point j under the condition that elements in the fault judgment matrix meet the formula 1;
and the second positioning slave module is used for positioning the fault point of the power distribution network with the fault in the measurement and control point i under the condition that the elements in the fault judgment matrix meet the formula 2, and the measurement and control point i is the terminal measurement and control point.
Optionally, the power distribution network system further includes: the system comprises a plurality of power supplies and an interconnection switch positioned between a measurement and control point j and a measurement and control point h, wherein the interconnection switch is connected with the power supplies of the power distribution network, the direction of the current of the power distribution network flowing out from a first power supply in the plurality of power supplies is selected as the positive direction, and the measurement and control point h is a measurement and control point which has no fault current and is positioned at the measurement and control point j far away from the first power supply side;
the receiving and determining module is configured to receive the fault location information, and determine that a fault point where the power distribution network has a fault is located between the measurement and control point i and the measurement and control point j, where the measurement and control point i is located at a measurement and control point where the measurement and control point j is close to the first power supply side;
and the control closing module is used for controlling the interconnection switch to execute switch closing operation so that the first power supply supplies power to the measurement and control point h.
By adopting the method for positioning the power distribution network fault, a fault state matrix can be established at any measurement and control point in the power distribution network under the condition that the power distribution network has the fault, and the fault point of the power distribution network with the fault can be positioned through the operation result of the fault state matrix and the normal matrix. The method does not need the main control point to receive various electric power information data sent by each measurement and control point, does not need a large amount of calculation of the main control point, only needs each measurement and control point to position the fault point by itself, does not generate calculation errors, greatly reduces the calculation amount of the main control point, has simpler contact between each measurement and control point and the main control point, improves the working efficiency of the main control point and fully utilizes the resources of each measurement and control point.
Drawings
Fig. 1 is a flowchart of a method for locating a fault of a power distribution network according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual power distribution network according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a system for power distribution network fault location according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention, but do not limit the invention to only some, but not all embodiments.
The inventor finds that the defects of complex calculation, large calculation amount and large storage amount exist in the fault location and isolation of the power distribution network of the power internet of things at the present stage, and the defects are that the power distribution network at the present stage is basically characterized in that a main control point receives various power information data sent by each measurement and control point, the operation is performed by combining different algorithms to obtain the operation state of each measurement and control point, the fault point is located when a fault occurs, and then control information is sent to the measurement and control point, so that the calculation amount is large, and the calculation is complex.
With the continuous enlargement of the power grid scale, the data volume and the calculation volume stored by the master control point server are greatly increased, and the connection between the master control point and each measurement and control point is more complicated, so that the probability of calculation errors is greatly increased.
Aiming at the problems, the inventor carries out deep research, combines a large number of actual tests and simulation experiments, creatively combines the idea of edge calculation, the topological structure of the power distribution network and redesigns a judgment algorithm, and solves the problems. The technical solution of the present invention is described in detail below.
Referring to fig. 1, a flowchart of a method for locating a fault of a power distribution network according to an embodiment of the present invention is shown, where the method is applied to a power distribution network system, and the power distribution network system includes: the method for positioning the faults of the power distribution network comprises the following steps of:
step 101: and establishing a fault state matrix by the plurality of measurement and control points under the condition that the power distribution network fails, wherein the fault state matrix represents the running state of the power distribution network when the power distribution network fails.
In an embodiment of the present invention, a power distribution network system includes: the main control point is connected with the plurality of measurement and control points in a topological structure mode, wherein the main control point generally controls the operation of the whole power distribution network, so that the main control point needs to receive operation data, working parameters and the like of all load devices, circuits, compensation devices and the like in the whole power distribution network, and the measurement and control points are generally responsible for receiving the operation data, the working parameters and the like of the load devices, the circuits, the compensation devices and the like in a certain range. The main control point is connected with the plurality of measurement and control points in a topological structure mode.
For example: the power distribution network in Sichuan province includes: the system comprises a main control point, measurement and control points of each county-level city and measurement and control points of a ground-level city, wherein the main control point is located in the metropolis, the metropolis also have one measurement and control point and is responsible for receiving operation data, working parameters and the like of load equipment, circuits, compensation equipment and the like in the metropolis range, and the main control point is connected with all the measurement and control points in a topological structure mode.
The fault state matrix is a matrix representing the operation state of the power distribution network when the power distribution network fails, and of course, when any one of the plurality of measurement and control points fails, the measurement and control point or the measurement and control points adjacent to the measurement and control point can establish the fault state matrix.
For example: suppose that the power distribution network in Sichuan province specifically includes: one master control point is connected with the Chengyang, Leshan, Yibin and Nanchang at the Chengyang and five measurement and control points respectively, if the Chengyang is connected with the Chengyang and the Leshan in the distribution network of Sichuan province, and if faults occur between the Chengyang or the Chengyang-Leshan, fault state matrixes can be established at the measurement and control points of the Chengyang, the Leshan, the Yibin and the Nanchang, of course, the fault state matrixes can be established at the measurement and control points of the Chengyang, other measurement and control points do not establish the fault state matrixes, or the fault state matrixes are established at the measurement and control points of the Chengyang and the Leshan, or the fault state matrixes are established at the measurement and control points of the Chengyang.
Step 102: and the plurality of measurement and control points locate the fault point of the power distribution network with the fault according to the operation result of the fault state matrix and the normal state matrix, and the normal state matrix represents the running state of the power distribution network in normal running and the connection relation between the main control point and the plurality of measurement and control points.
In the embodiment of the invention, after the fault state matrix is established, the fault point of the power distribution network with a fault can be positioned by the plurality of measurement and control points through the operation result of the fault state matrix and the normal state matrix, wherein the normal state matrix represents the running state of the power distribution network in normal running and the connection relation between the main control point and the plurality of measurement and control points.
In general, the normal matrix is established when the power distribution network normally operates and is stored in each measurement and control point, and because the values of elements in the normal matrix are not changed when the power distribution network normally operates, the normal matrix is not changed as long as the operation state or the operation mode of the power distribution network is not changed. In addition, the normal state matrix of the embodiment of the invention can also represent the connection relation between the main control point and the plurality of measurement and control points.
Optionally, the normality matrix S in the embodiment of the present invention is established by the following method:
assuming that the direction of current flowing out of the power supply in the power distribution network is a positive direction, that is, the direction of power output generated by the power supply is a positive direction, if there are a plurality of power supplies in the power distribution network, the direction of power output generated by one of the power supplies is assumed to be a positive direction.
For a system with n measurement and control points, the normal matrix S is a square matrix of n multiplied by n orders, and the element S in the normal matrix SijIs 0 or 1, wherein i and j represent any two measurement and control points in the power distribution network: the element S is an element I and an element J, if normal current flows from the measurement and control point i to the measurement and control point j and the flow direction is consistent with the positive directionijMarking as 1; if the normal current flows from the measurement and control point i to the measurement and control point j and the flow direction is not consistent with the positive direction, the element SijIs 0; if the normal current flows from the measurement and control point j to the measurement and control point i, the element SijIs 0, i.e.:
by the method, a normal matrix S of the power distribution network is established for all the measurement and control points.
Optionally, the fault state matrix G in the embodiment of the present invention is established by the following method:
the positive direction is chosen as for the normality matrix S. When any fault occurs in the power distribution network, the measurement and control points can detect that fault current flows on a line of a fault point or a line between the fault point and an adjacent measurement and control point, and the measurement and control points establish a fault state matrix G by using the fault current. Element G in the fault state matrix GiiThe values of (A) are as follows: 0 or 1; detecting the fault current at the measurement and control point i, wherein the flow direction of the fault current is consistent with the positive direction, and then the element GiiIs 1; detecting the fault current existing at the measurement and control point i, wherein the flow direction of the fault current is inconsistent with the positive direction, and then the element GiiIs 0, i.e.:
similarly, if n nodes exist in the network, the fault state matrix G is also an n × n order matrix and is a diagonal matrix, and by the above method, all the measurement and control points can establish the fault state matrix G when the power distribution network fails.
Optionally, when the power distribution network is in a fault and the measurement and control points establish the fault state matrix G, the measurement and control points (a plurality of or any one of the measurement and control points) perform summation operation on the fault state matrix G and the normal state matrix S to obtain a fault judgment matrix P; the fault point of the power distribution network, which has a fault, can be located by the aid of the fault judgment matrix P and the fault location formula at the measurement and control points (a plurality of or any one of the measurement and control points).
Wherein, the fault location formula includes:
equation 1:
and equation 2:
wherein, formula 1 is used for locating whether the fault occurs between the measurement and control point i and the measurement and control point j, PiiFor the elements of the sum value, P, of the corresponding measurement and control points i in the fault determination matrixijFor the element, P, of the sum value between the measurement and control point i and the measurement and control point j in the fault determination matrixjjAnd elements of the summation value corresponding to the measurement and control point j in the fault judgment matrix.
Namely, the criterion for judging whether a fault occurs between two measurement and control points is as follows: if the direction of the fault current flowing through the measurement and control point i is a positive direction, and if the measurement and control point j is behind the measurement and control point i, and if no fault current flows through the measurement and control point j or a fault current opposite to the positive direction flows through the measurement and control point j, it can be judged that a fault occurs between the measurement and control point i and the measurement and control point j.
And combining the fault judgment matrix P and the fault positioning formula, and under the condition that the elements in the fault judgment matrix satisfy the formula 1, the measurement and control point positions the fault point of the power distribution network, which has a fault, between the measurement and control point i and the measurement and control point j.
And the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network. Namely, the criterion for judging whether the fault occurs at the end node of the power distribution network is as follows: and if the fault current flows through the measurement and control point i and no measurement and control point connected with the measurement and control point i exists from the measurement and control point i, judging that the measurement and control point i is a terminal node and is a fault node.
And combining the fault judgment matrix P and the fault positioning formula, and under the condition that the elements in the fault judgment matrix satisfy the formula 2, positioning the fault point of the power distribution network, which has a fault, at the measurement and control point i, wherein the measurement and control point i is the tail end measurement and control point of the power distribution network.
Optionally, after the measurement and control point locates the fault point where the power distribution network has a fault, if the fault point where the fault occurs is between the measurement and control point i and the measurement and control point j, the measurement and control point i and the measurement and control point j both send fault alarm information and perform fault isolation operation, and the measurement and control point i and the measurement and control point j both perform switch trip operation, so that the fault point is cut off from the power distribution network, and the fault point does not affect the normal operation of the power distribution network. Meanwhile, the measurement and control point i and the measurement and control point j both send fault positioning information and fault alarm information to the master control point.
If the fault point with the fault is at the measurement and control point i, the measurement and control point i sends fault alarm information and performs fault isolation operation, and the measurement and control point i executes switch tripping operation, so that the fault point measurement and control point i is cut off from the power distribution network, and the fault point measurement and control point i cannot influence the normal operation of the power distribution network. Meanwhile, the measurement and control point i sends fault positioning information and fault alarm information to the main control point.
Optionally, the power distribution network system further includes: the system comprises a plurality of power supplies and a connection switch positioned between a measurement and control point j and a measurement and control point h, wherein the connection switch is connected with the power supplies of the power distribution network, the direction of the current of the power distribution network flowing out from a first power supply in the plurality of power supplies is selected to be a positive direction, the directions of the currents flowing out from the other power supplies are negative directions, the measurement and control point h is a measurement and control point which has no fault current and is positioned at the side of the measurement and control point j far away from the first power supply, namely, the measurement and control point h is positioned behind the measurement and control point j; the measurement and control point sends out failure alarm information, carries out fault isolation operation to send to the master control point after fault location information and failure alarm information:
the main control point receives the fault positioning information, and determines that a fault point of the power distribution network is between a measurement and control point i and a measurement and control point j, wherein the measurement and control point i is positioned at the measurement and control point j close to the measurement and control point on the side of the first power supply, namely the measurement and control point i is positioned in front of the measurement and control point j and far away from the first power supply;
the main control point controls the interconnection switch to execute switch closing operation, so that the first power supply supplies power for the measurement and control point h, normal operation of all measurement and control point ranges in the whole power distribution network except the measurement and control point i and the measurement and control point j is still guaranteed, and the whole power distribution network is recombined. Of course, it can be understood that, in the case of multiple power supplies, it may not be necessary to control the interconnection switch to perform the switch closing operation, and the power supplies other than the first power supply directly supply power to the devices in all the measurement and control point ranges in the entire power distribution network except the measurement and control point i and the measurement and control point j.
Hereinafter, the technical solution of the present invention is explained again with two specific examples. Referring to fig. 2, which shows a schematic structural diagram of a single power distribution network according to an embodiment of the present invention, in the diagram, G1 is a power supply, a direction of a current flowing out from G1 is a positive direction, and 8 measurement and control points are distributed on a whole distribution network line: 1. 2, 3, 4, 5, 6, 7, and 8, which are established according to the method of the normal matrix S, the normal matrix S of the distribution network can be obtained as follows:
if a fault occurs in the area between the measurement and control points 3 and 4 and the area between the measurement and control points 3 and 6, the fault state matrix G obtained by the method for establishing the fault state matrix G is:
and (3) solving the sum of the normal matrix S and the fault state matrix G to obtain a fault judgment matrix P:
according to the fault judgment matrix P, P11If 1, inquiring the row of the measurement and control point 1, and having P12When the measurement and control point 2 is in the column 1, P is arranged221, the formula 1 and the formula 2 in the above are not satisfied, so that no fault exists between the measurement and control point 1 and the measurement and control point 2; due to P22If 1, inquiring the row of the measurement and control point 2, and having P23When the column of the measurement and control point 3 is queried, if P33 is 1, the formula 1 and the formula 2 are not satisfied, so that no fault exists between the measurement and control point 2 and the measurement and control point 3; due to P331, so query measurement and control point 3 is in the row with P341 and P361 due to P440 and P660, so equation 1 is satisfied, and thus it is determined that the fault is in the region between measurement and control points 3 and 4 and between measurement and control points 3 and 6. After the fault point is located, the switches of the measurement and control point 3, the measurement and control point 4 and the measurement and control point 6 are tripped, and the measurement and control point 3, the measurement and control point 4 and the measurement and control point 6 send out an alarm to the master control point. It can be understood that the normal load which does not have faults after fault isolation is difficult to normally supply power, therefore, if the interconnection switch exists, the power supply of the normal load which does not have faults can be recovered by operating the interconnection switch for the power distribution network with a more reasonable structure.
Referring to fig. 3, which shows a schematic structural diagram of a dual power distribution network according to an embodiment of the present invention, in the diagram, G1 and G2 are both power supplies, a direction of a current flowing out from G1 is a assumed positive direction, and 9 measurement and control points are distributed on a line of the entire distribution network: 1. 2, 3, 4, 5, 6, 7, 8, 9, and a tie switch is arranged between the outgoing line of G1 and the nodes 3 and 4, and the normal matrix S of the distribution network is established according to the method of the normal matrix S:
if faults occur between the measurement and control points 1 and 2, between 5 and 6, and between 8 and 9, the fault information matrix G obtained according to the method for establishing the fault state matrix G is:
and (3) solving the sum of the normal matrix S and the fault state matrix G to obtain a fault judgment matrix P:
according to the fault judgment matrix P, P11If the query measurement and control point 1 is in the row with the value of P12 being equal to 1, the query measurement and control point 2 is in the column with the value of P according to the formula 122The value is 0, so that the formula 1 is satisfied, and therefore, the fault exists between the measurement and control point 1 and the measurement and control point 2; due to P55If 1, inquiring the row of the measurement and control point 5, and having P561, so query measurement and control point 6 is in the column, P66If the value is 0, judging that a fault exists between the measurement and control point 5 and the measurement and control point 6 according to the formula 1; due to P88If 1, then query measurement and control point 8 is in line with P891, so query measurement and control point 9 is in the column, P990, it is determined that there is a failure between measurement and control point 8 and measurement and control point 9. Therefore, the switches of the measurement and control points 1, 2, 5, 6, 8 and 9 are tripped, and the measurement and control points 1 and 2, the measurement and control points 5 and 6 and the measurement and control points 8 and 9 send out an alarm to the main control point. It can be understood that after the fault is isolated, the load power supply between the measurement and control points 3 and 4 and between the measurement and control points 2 and 5 is forced to be interrupted, and the power supply can be recovered by closing the contact switch at the moment, so that the recombination of the power distribution network is completed.
Referring to fig. 4, a schematic diagram of a system for power distribution network fault location according to an embodiment of the present invention is shown, where the system includes: the system comprises a main control point and a plurality of measurement and control points, wherein the main control point is connected with the plurality of measurement and control points in a topological structure mode, and all the measurement and control points in the plurality of measurement and control points comprise: establishing a fault state matrix module, an operation positioning module, a normal matrix element dereferencing module and a fault state matrix element dereferencing module; the master control point comprises: the method comprises the steps of receiving a determining module and controlling a closing module;
the fault state matrix establishing module is used for establishing a fault state matrix under the condition that the power distribution network fails, and the fault state matrix represents the running state of the power distribution network when the power distribution network fails;
the operation positioning module is used for positioning fault points of the power distribution network, which have faults, according to operation results of the fault state matrix and the normal state matrix, wherein the normal state matrix represents an operation state of the power distribution network in normal operation and a connection relation between the main control point and the plurality of measurement and control points.
Optionally, the normal matrix element value taking module is configured to calculate a value of an element in the normal matrix;
wherein an element S in the normality matrixijThe values of (A) are as follows: 0 or 1; wherein i and j represent any two measurement and control points in the power distribution network;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is consistent with the positive direction, the value of the element Sij is 1, and the positive direction is the direction in which the current of the power distribution network flows out from a power supply;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is inconsistent with the positive direction, the value of the element Sij is 0;
and under the condition that the normal current of the measurement and control point i flows from the measurement and control point j to the measurement and control point i, the value of the element Sij is 0.
Optionally, the failure state matrix element dereferencing module is configured to calculate dereferencing of elements in the failure state matrix;
the values of the elements Gii in the fault state matrix are: 0 or 1;
the measurement and control point i detects whether fault current exists or not;
under the condition that the measurement and control point i detects that the fault current exists in the measurement and control point i and the flow direction of the fault current is consistent with the positive direction, the value of the element Gii is 1;
and under the condition that the measurement and control point i detects that the fault current exists per se and the flow direction of the fault current is inconsistent with the positive direction, the value of the element Gii is 0.
Optionally, the operation positioning module includes:
the operation submodule is used for carrying out summation operation on the fault state matrix and the normal state matrix to obtain a fault judgment matrix;
the positioning sub-module is used for positioning a fault point of the power distribution network, which has a fault, by using the fault judgment matrix and the fault positioning formula;
wherein the fault location formula comprises:
equation 1:
and equation 2:
the formula 1 is used for positioning whether a fault occurs between the measurement and control point i and the measurement and control point j, and PiiAn element P corresponding to the summation value of the measurement and control point i in the fault judgment matrixijThe element P corresponding to the summation value between the measurement and control point i and the measurement and control point j in the fault judgment matrixjjElements of the summation value corresponding to the measurement and control point j in the fault judgment matrix are obtained;
the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network.
Optionally, the positioning sub-module comprises:
the first positioning slave module is used for positioning a fault point of the power distribution network, which has a fault, between the measurement and control point i and the measurement and control point j under the condition that elements in the fault judgment matrix meet the formula 1;
and the second positioning slave module is used for positioning the fault point of the power distribution network with the fault in the measurement and control point i under the condition that the elements in the fault judgment matrix meet the formula 2, and the measurement and control point i is the terminal measurement and control point.
Optionally, the power distribution network system further includes: the system comprises a plurality of power supplies and an interconnection switch positioned between a measurement and control point j and a measurement and control point h, wherein the interconnection switch is connected with the power supplies of the power distribution network, the direction of the current of the power distribution network flowing out from a first power supply in the plurality of power supplies is selected as the positive direction, and the measurement and control point h is a measurement and control point which has no fault current and is positioned at the measurement and control point j far away from the first power supply side;
the receiving and determining module is configured to receive the fault location information, and determine that a fault point where the power distribution network has a fault is located between the measurement and control point i and the measurement and control point j, where the measurement and control point i is located at a measurement and control point where the measurement and control point j is close to the first power supply side;
and the control closing module is used for controlling the interconnection switch to execute switch closing operation so that the first power supply supplies power to the measurement and control point h.
Through the embodiment, when the power distribution network fails, any measurement and control point in the power distribution network can establish the fault state matrix, the fault point of the power distribution network with the failure can be located according to the operation result of the fault state matrix and the normal matrix, isolation operation is performed after the fault point is located, and alarm information is sent out, so that relevant workers can process the fault. According to the technical scheme, the power distribution network fault location and isolation method based on the ubiquitous power Internet of things is provided by combining the idea of edge calculation, the mode of power distribution network fault location is designed, required data are directly extracted from the measurement and control points, data exchange between the main control points and the measurement and control points is not needed, a large amount of calculation of the main control points is not needed, the fault points are quickly and efficiently located by using a matrix algorithm, the working efficiency of the main control points is improved, and the resources of the measurement and control points are fully utilized.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The embodiments of the present invention have been described in connection with the accompanying drawings, and the principles and embodiments of the present invention are described herein using specific examples, which are provided only to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for fault location of a power distribution network is applied to a power distribution network system, and the power distribution network system comprises the following steps: the method comprises the following steps that a main control point and a plurality of measurement and control points are connected in a topological structure mode, and the method comprises the following steps:
the method comprises the following steps that a fault state matrix is established by the multiple measurement and control points under the condition that the power distribution network fails, and the fault state matrix represents the running state of the power distribution network when the power distribution network fails;
and the plurality of measurement and control points locate the fault point of the power distribution network with a fault according to the operation result of the fault state matrix and the normal state matrix, and the normal state matrix represents the running state of the power distribution network in normal running and the connection relation between the main control point and the plurality of measurement and control points.
2. The method of claim 1, wherein the step of removing the metal oxide layer comprises removing the metal oxide layer from the metal oxide layerElement S in the normality matrixijThe values of (A) are as follows: 0 or 1; wherein i and j represent any two measurement and control points in the power distribution network;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is consistent with the positive direction, the value of the element Sij is 1, and the positive direction is the direction in which the current of the power distribution network flows out from a power supply;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is inconsistent with the positive direction, the value of the element Sij is 0;
and under the condition that the normal current of the measurement and control point i flows from the measurement and control point j to the measurement and control point i, the value of the element Sij is 0.
3. The method according to claim 2, wherein the value of element Gii in the fault status matrix is: 0 or 1;
the measurement and control point i detects whether fault current exists or not;
under the condition that the measurement and control point i detects that the fault current exists in the measurement and control point i and the flow direction of the fault current is consistent with the positive direction, the value of the element Gii is 1;
and under the condition that the measurement and control point i detects that the fault current exists per se and the flow direction of the fault current is inconsistent with the positive direction, the value of the element Gii is 0.
4. The method of claim 2, wherein the positioning of the fault point of the power distribution network by the multiple measurement and control points according to the operation result of the fault state matrix and the normal matrix comprises:
the plurality of measurement and control points perform summation operation on the fault state matrix and the normal state matrix to obtain a fault judgment matrix;
the plurality of measurement and control points locate fault points of the power distribution network, which have faults, by using the fault judgment matrix and the fault location formula;
wherein the fault location formula comprises:
equation 1:
and equation 2:
the formula 1 is used for positioning whether a fault occurs between the measurement and control point i and the measurement and control point j, and PiiAn element P corresponding to the summation value of the measurement and control point i in the fault judgment matrixijThe element P corresponding to the summation value between the measurement and control point i and the measurement and control point j in the fault judgment matrixjjElements of the summation value corresponding to the measurement and control point j in the fault judgment matrix are obtained;
the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network.
5. The method of claim 4, wherein the plurality of measurement and control points locate the fault point of the power distribution network where the fault occurs by using the fault determination matrix and a fault location formula, and the method comprises the following steps:
under the condition that elements in the fault judgment matrix meet the formula 1, the plurality of measurement and control points position fault points of the power distribution network, which have faults, between the measurement and control point i and the measurement and control point j;
and under the condition that the elements in the fault judgment matrix meet the formula 2, the plurality of measurement and control points position the fault point of the power distribution network with the fault at the measurement and control point i, wherein the measurement and control point i is the tail end measurement and control point.
6. The method of claim 5, wherein after the plurality of measurement and control points locate a point of failure at which the power distribution network fails, the method further comprises:
when a fault point with a fault is between the measurement and control point i and the measurement and control point j, the measurement and control point i and the measurement and control point j both send fault alarm information, perform fault isolation operation and send fault positioning information and fault alarm information to the master control point;
under the condition that a fault point with a fault is at the measurement and control point i, the measurement and control point i sends fault alarm information, fault isolation operation is carried out, and fault positioning information and fault alarm information are sent to the main control point;
wherein the fault isolation operation comprises:
under the condition that a fault point with a fault is between the measurement and control point i and the measurement and control point j, the measurement and control point i and the measurement and control point j both execute switch tripping operation;
and under the condition that the fault point with the fault is at the measurement and control point i and the measurement and control point i is the tail end measurement and control point, the measurement and control point i executes the switch tripping operation.
7. The method of claim 2, wherein the power distribution grid system further comprises: the system comprises a plurality of power supplies and an interconnection switch positioned between a measurement and control point j and a measurement and control point h, wherein the interconnection switch is connected with the power supplies of the power distribution network, the direction of the current of the power distribution network flowing out from a first power supply in the plurality of power supplies is selected as the positive direction, and the measurement and control point h is a measurement and control point which has no fault current and is positioned at the measurement and control point j far away from the first power supply side; the method comprises the following steps that the measurement and control point sends out fault alarm information, fault isolation operation is carried out, and after fault positioning information and the fault alarm information are sent to the main control point, the method further comprises the following steps:
the master control point receives the fault positioning information, and determines that a fault point of the power distribution network, which has a fault, is between the measurement and control point i and the measurement and control point j, and the measurement and control point i is positioned at a measurement and control point, which is close to the first power supply side, of the measurement and control point j;
and the main control point controls the interconnection switch to execute switch closing operation so that the first power supply supplies power to the measurement and control point h.
8. A system for fault location of a power distribution network, the system comprising: the system comprises a main control point and a plurality of measurement and control points, wherein the main control point is connected with the plurality of measurement and control points in a topological structure mode, and all the measurement and control points in the plurality of measurement and control points comprise: establishing a fault state matrix module, an operation positioning module, a normal matrix element dereferencing module and a fault state matrix element dereferencing module; the master control point comprises: the method comprises the steps of receiving a determining module and controlling a closing module;
the fault state matrix establishing module is used for establishing a fault state matrix under the condition that the power distribution network fails, and the fault state matrix represents the running state of the power distribution network when the power distribution network fails;
the operation positioning module is used for positioning fault points of the power distribution network, which have faults, according to operation results of the fault state matrix and the normal state matrix, wherein the normal state matrix represents an operation state of the power distribution network in normal operation and a connection relation between the main control point and the plurality of measurement and control points.
9. The apparatus of claim 8, wherein the normality matrix element evaluation module is configured to calculate evaluation values of elements in the normality matrix;
wherein an element S in the normality matrixijThe values of (A) are as follows: 0 or 1; wherein i and j represent any two measurement and control points in the power distribution network;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is consistent with the positive direction, the value of the element Sij is 1, and the positive direction is the direction in which the current of the power distribution network flows out from a power supply;
under the condition that the normal current of the measurement and control point i flows to the measurement and control point j from the measurement and control point i, and the flow direction is inconsistent with the positive direction, the value of the element Sij is 0;
under the condition that the normal current of the measurement and control point i flows from the measurement and control point j to the measurement and control point i, the value of the element Sij is 0
The operation positioning module comprises:
the operation submodule is used for carrying out summation operation on the fault state matrix and the normal state matrix to obtain a fault judgment matrix;
the positioning sub-module is used for positioning a fault point of the power distribution network, which has a fault, by using the fault judgment matrix and the fault positioning formula;
wherein the fault location formula comprises:
equation 1:
and equation 2:
the formula 1 is used for positioning whether a fault occurs between the measurement and control point i and the measurement and control point j, and PiiAn element P corresponding to the summation value of the measurement and control point i in the fault judgment matrixijThe element P corresponding to the summation value between the measurement and control point i and the measurement and control point j in the fault judgment matrixjjElements of the summation value corresponding to the measurement and control point j in the fault judgment matrix are obtained;
the formula 2 is used for positioning whether the fault occurs at the terminal measurement and control point of the power distribution network.
10. The apparatus of claim 9, wherein the failure state matrix element dereferencing module is configured to calculate dereferences of elements in the failure state matrix;
the values of the elements Gii in the fault state matrix are: 0 or 1;
the measurement and control point i detects whether fault current exists or not;
under the condition that the measurement and control point i detects that the fault current exists in the measurement and control point i and the flow direction of the fault current is consistent with the positive direction, the value of the element Gii is 1;
and under the condition that the measurement and control point i detects that the fault current exists per se and the flow direction of the fault current is inconsistent with the positive direction, the value of the element Gii is 0.
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