CN114545148B - Power distribution network fault section positioning method and device, storage medium and computing equipment - Google Patents
Power distribution network fault section positioning method and device, storage medium and computing equipment Download PDFInfo
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Abstract
The invention discloses a method, a device, a storage medium and a computing device for positioning a fault section of a power distribution network, wherein the method acquires the magnitude and the direction of current flowing through a power distribution terminal before and after the occurrence of a fault; taking a section between two distribution terminals of a main line as a unit, and dividing the corresponding section into a first fault section set if the fault current directions flowing through the two distribution terminals are inconsistent; and finally determining the section where the fault point is located according to the direction change of the current of the distribution terminal before and after the fault. The invention corrects the problems caused by the fact that the conventional distribution automation fault section criterion is not suitable for large-scale distributed power supply access and the operation mode adjustment.
Description
Technical Field
The invention relates to a method and a device for positioning a fault section of a power distribution network, a storage medium and computing equipment, and belongs to the technical field of relay protection of power distribution networks.
Background
The large-scale access of clean energy and the efficient utilization of energy are key technologies, and the promotion of large-scale development and utilization of clean renewable energy is a trend of development of power transmission and distribution technologies. In the environment of a novel power system with new energy as a main body, the operation form of an original power distribution network is changed in a large-scale new energy grid-connected and distribution network grid-connected area autonomous mode. The dispersibility, randomness, unpredictability, control strategy variability and power grid morphological structure change of the new energy source change the operation characteristics and fault current distribution characteristics of the power grid, and new requirements are put forward for protection control schemes of the power grid and rapid fault isolation and power supply recovery of power distribution automation.
The traditional power distribution network mainly uses three-section type current protection, and is provided with current differential protection in a region with high permeability distributed power supply or high reliability, and the faults of the distribution line are mostly dependent on a distribution automation system. When the distribution line breaks down, a transformer substation outlet switch or a switch for enabling grading protection is tripped, a distribution terminal on the distribution line sends fault alarm information to a distribution automation system, the distribution automation system determines a fault section according to the alarm information of the distribution terminal by combining with a grid topology, fault isolation is achieved, and power supply recovery of a non-fault section is achieved through switching on of a contact switch and an outlet switch/grading protection tripping switch.
The fault current distribution characteristics of the power distribution network are changed after large-scale access of new energy, the existing three-section current protection is not applicable any more, the situations of override tripping or switch refusing can occur, and the current differential protection is difficult to set and calculate and seriously affects the safe and reliable operation of the power distribution network under the influence of a distributed power supply control strategy.
Disclosure of Invention
The invention aims to provide a method, a device, a storage medium and computing equipment for locating a fault section of a power distribution network after large-scale access of new energy, which solve the problem that the conventional fault area discrimination strategy of a power distribution automation system is not applicable any more after large-scale access of new energy, and locate the fault section based on normal load information and fault information (short circuit alarm) collected by a power distribution terminal on a power distribution line.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a power distribution network fault section positioning method, which comprises the following steps:
acquiring the current magnitude and direction of all power distribution terminals flowing through a main line before a fault occurs and the current magnitude and direction of all power distribution terminals flowing through the main line after the fault occurs;
judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main road after the fault occurs;
determining a first fault section set for a power distribution terminal with overcurrent based on the current direction of a main line flowing through two adjacent power distribution terminals after the fault occurs;
Dividing the first fault section set into a second fault section set and a third fault section set according to the current direction flowing through two adjacent power distribution terminals after the fault occurs;
screening the second fault section set and the third fault section set based on current directions of two adjacent power distribution terminals before and after the fault occurs, so as to obtain a fourth fault section set;
and screening the fourth fault section set based on the current direction of the distribution terminal on the branch line of the main line after the fault occurs to determine the section where the fault point is located.
Further, the current flowing from the main power supply to the power distribution terminal is in a positive current direction, the current flowing through the power distribution terminal is smaller than a preset current threshold, the current flowing from the power distribution terminal to the main power supply is in a negative current direction, and the current flowing through the power distribution terminal is 0.
Further, the judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main line after the fault occurs includes:
and if the current of the power distribution terminal after the fault occurs is greater than or equal to a preset fault current overcurrent threshold, judging that the overcurrent power distribution terminal exists.
Further, the determining the first fault section set based on the current direction flowing through two adjacent distribution terminals on the main line after the fault occurs includes:
And traversing the sections on the main line and the downstream section by taking the section between two adjacent power distribution terminals on the main line as a unit, and dividing the corresponding section into a first fault section set if the current directions of the two power distribution terminals of one section are inconsistent.
Further, the dividing the first fault section set into a second fault section set and a third fault section set according to the current direction flowing through two adjacent distribution terminals after the fault occurs includes:
traversing the sections in the first fault section set, and dividing the corresponding sections into a second fault section set if the current directions of the two power distribution terminals of one section are positive and negative directions respectively;
if the current direction of two power distribution terminals of one section is zero and only one is zero, the corresponding section is divided into a third set of fault sections.
Further, the screening of the second fault section set and the third fault section set based on the current directions of two adjacent power distribution terminals before and after the fault occurs, to obtain a fourth fault section set, includes:
traversing the sections in the second fault section set, and dividing the corresponding section into a fourth fault section set if two power distribution terminals of one section have and only one current direction changes with the current direction before the fault occurs;
And traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the current directions of the two power distribution terminals of one section are unchanged compared with the current direction before the fault occurs, or the current direction of the power distribution terminal before the fault occurs is nonzero but the current direction after the fault occurs is zero.
Further, the screening the fourth fault section set based on the current direction of the distribution terminal on the branch line of the main line to determine the section where the fault point is located includes:
traversing the sections in the fourth fault section set, judging whether branch circuits exist,
If no branch line exists, determining that the fault point is located in the section;
If a branch line exists, and the current direction of a power distribution terminal on the branch line is a positive direction, determining that a fault point is positioned on the branch line of the section;
Otherwise, determining that the fault point is located in the main line of the section.
The invention also provides a power distribution network fault section positioning device, which comprises:
The acquisition module is used for acquiring the current magnitude and direction of all the power distribution terminals flowing through the main line before the fault occurs and the current magnitude and direction of all the power distribution terminals flowing through the main line after the fault occurs;
The judging module is used for judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main road after the fault occurs;
The first screening module is used for determining a first fault section set of the power distribution terminals with overcurrent based on the current directions of two adjacent power distribution terminals flowing through the main line after the fault occurs;
the second screening module is used for dividing the first fault section set into a second fault section set and a third fault section set according to the current directions of two adjacent power distribution terminals flowing through the main line after the fault occurs;
The third screening module is used for screening the second fault section set and the third fault section set based on the current directions of two adjacent power distribution terminals before and after the fault occurs to obtain a fourth fault section set;
And
And the output module is used for screening the fourth fault section set based on the direction of the distribution terminal current of the phase on the branch line of the main line to determine the section where the fault point is located.
Further, the first screening module is specifically configured to,
And traversing the sections on the main line and the downstream section by taking the section between two adjacent distribution terminals on the main line as a unit, and dividing the corresponding section into a first fault section set if the current directions of the two distribution terminals of one section are inconsistent, wherein the current flowing from the main power supply to the distribution terminals is in the positive current direction, the current flowing through the distribution terminals is less than the preset current threshold, the current direction is 0, and the current flowing from the distribution terminals to the main power supply is in the negative current direction.
Further, the second screening module is specifically configured to,
Traversing the sections in the first fault section set, and dividing the corresponding sections into a second fault section set if the current directions of the two power distribution terminals of one section are positive and negative directions respectively;
if the current direction of two power distribution terminals of one section is zero and only one is zero, the corresponding section is divided into a third set of fault sections.
Further, the third screening module is specifically configured to,
Traversing the sections in the second fault section set, and dividing the corresponding section into a fourth fault section set if two power distribution terminals of one section have and only one current direction changes with the current direction before the fault occurs;
traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the current direction of the two power distribution terminals of one section is unchanged from the current direction before the fault occurs or the current direction of the power distribution terminals before the fault occurs is nonzero but the current direction after the fault occurs is zero.
Further, the output module is specifically used for,
Traversing the sections in the fourth fault section set, judging whether branch circuits exist,
If no branch line exists, determining that the fault point is located in the section;
If a branch line exists, and the current direction of a power distribution terminal on the branch line is a positive direction, determining that a fault point is positioned on the branch line of the section; otherwise, determining that the fault point is located in the main line of the section.
A third aspect of the invention provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods described herein.
A fourth aspect of the invention provides a computing device comprising,
One or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods according to the foregoing.
The beneficial effects of the invention are as follows:
the invention realizes the discrimination of the fault section by utilizing the magnitude and the direction of the fault current and the normal load current flowing through the two ends of the power distribution terminal before and after the fault, and corrects the problems caused by the condition that the conventional power distribution automation fault section criterion is not suitable for large-scale distributed power supply access and the operation mode adjustment.
Drawings
Fig. 1 is a flowchart of a method for locating a fault section of a power distribution network after large-scale access of new energy provided by an embodiment of the invention.
FIG. 2 is a schematic diagram of a network topology of a tie switch opening condition in an embodiment of the present invention;
fig. 3 is a network topology diagram of a closing situation of a tie switch in an embodiment of the present invention;
fig. 4 is a network topology diagram of a connection switch closing and new energy reverse sending situation in the embodiment of the present invention.
Detailed Description
The invention is further described below. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
The embodiment of the invention provides a method for positioning a fault section of a power distribution network after large-scale access of new energy, which aims to analyze distribution characteristics of short-circuit fault currents of the power distribution network and provides the following steps:
(a) The positive direction of the load current is that the main power supply flows to the line (load), namely that the bus flow to the line is positive (set to be 1); no current flows (set to 0); the load flow to the main power supply is negative (set to-1);
(b) The direction of the inflow node or the bus of the branch switch is a negative direction, and the direction of the outflow node or the bus is a positive direction.
Taking figure 2 as an example to analyze the distribution network fault current distribution characteristics after new energy is accessed,
1. Under the condition of disconnection of the contact switch
Normally, the current direction of each detection point is positive, and the direction of the load current of each detection point is shown in the following table.
TABLE 1 load current direction under normal conditions
| Detecting point position | F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 |
| Direction of current flow | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 |
Under normal conditions, the normal load current direction of the distribution terminal in the positive and negative directions of the tie switch is positive.
Assuming that neither DG1 nor DG2 provides a short circuit current to the fault point after the fault, the direction of the fault current at each of the detection points under different fault conditions is shown in table 2 below.
TABLE 2 Fault current direction under New energy Source providing no short Circuit Current
| F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 | |
| F 1 Point failure | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| F 2 Point failure | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| F 3 Point failure | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| F 4 Point failure | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
When no distributed new energy is connected or no short-circuit current is provided by the new energy, the distribution characteristics of the fault current are as follows:
(a1) The fault point upstream detection point can detect overcurrent, and the fault current direction is positive;
(b1) No fault current is present downstream of the fault point;
(c1) When the branch line fails, the branch line fault current is positive; when the branch line has no fault, no fault current exists.
The above features can be used to determine the fault section.
Assuming that DG1 and DG2 provide a short-circuit current to the fault point after the fault, the direction of the fault current at each of the detection points under different fault conditions is shown in table 3 below.
TABLE 3 fault current direction under the New energy providing short Circuit Current
| F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 | |
| F 1 Point failure | 1 | -1 | -1 | -1 | 0 | 0 | 0 | 0 | 0 |
| F 2 Point failure | 1 | 1 | 1 | -1 | 0 | 0 | 0 | 0 | 0 |
| F 3 Point failure | 0 | 0 | 0 | 0 | 0 | 0 | -1 | 1 | 1 |
| F 4 Point failure | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
When the distributed new energy is connected and short-circuit current is provided for the fault point, the distribution characteristics of the fault current are as follows:
(a2) The fault point upstream detection point can detect overcurrent, and the current direction is positive;
(b2) The detection point at the downstream of the fault point can detect overcurrent, and the current direction is negative; if the short-circuit current provided by the new energy source is smaller and does not exceed the overcurrent threshold, the downstream of the fault point is considered to be free from overcurrent, and the fault point is marked as 0, as shown in table 3;
(c2) When the branch line fails, the branch line fault current is positive; when the branch line is fault-free, the fault current is negative or zero.
The above features can be used to determine the fault section.
2. Under the condition of closing the contact switch
Taking fig. 3 as an example, the normal load current and the fault current directions under the condition of closing the connecting switch (line cutting) are analyzed.
Normally, the current direction of each detection point is positive, and the fault current direction of each detection point is shown in the following table.
TABLE 4 load current direction under normal conditions
| Detecting point position | F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 |
| Direction of current flow | 1 | 1 | 1 | 1 | 1 | -1 | 1 | -1 | 0 |
Under normal conditions, the current direction on the distribution terminal in the positive direction of the tie switch is positive, the current direction on the distribution terminal in the negative direction of the tie switch is negative, and the current direction on the branch line is positive.
Assuming that neither DG1 nor DG2 provides a short circuit current to the fault point after the fault, the direction of the fault current at each of the detection points under different fault conditions is shown in table 5 below.
TABLE 5 fault current direction under New energy Source providing no short Circuit Current
| F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 | |
| F 1 Point failure | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| F 2 Point failure | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| F 3 Point failure | 1 | 1 | 1 | 0 | 1 | -1 | 0 | 0 | 0 |
| F 4 Point failure | 1 | 1 | 1 | 0 | 1 | -1 | 1 | 0 | 0 |
When no distributed new energy is connected or no short-circuit current is provided by the new energy, the distribution characteristics of the fault current are as follows:
(a3) The upstream detection point of the fault point can detect overcurrent, the fault current direction on the distribution terminal in the positive direction of the interconnecting switch is positive, and the fault current direction in the negative direction of the interconnecting switch is negative;
(b3) No fault current is present downstream of the fault point;
(c3) When the branch line fails, the branch line fault current is positive; when the branch line has no fault, no fault current exists.
The above features can be used to determine the fault section.
Assuming that DG1 and DG2 provide a short-circuit current to the fault point after the fault, the direction of the fault current at each of the detection points under different fault conditions is shown in table 6 below.
TABLE 6 fault current direction under the condition of providing short-circuit current by new energy
| F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 | |
| F 1 Point failure | 1 | -1 | -1 | -1 | -1 | 1 | -1 | 0 | 0 |
| F 2 Point failure | 1 | 1 | 1 | -1 | -1 | 1 | -1 | 0 | 0 |
| F 3 Point failure | 1 | 1 | 1 | -1 | 1 | -1 | -1 | 0 | 0 |
| F 4 Point failure | 1 | 1 | 1 | -1 | 1 | -1 | 1 | 0 | 0 |
When the distributed new energy is connected and short-circuit current is provided for the fault point, the distribution characteristics of the fault current are as follows:
(a4) The upstream detection point of the fault point can detect overcurrent, the fault current direction on the distribution terminal in the positive direction of the interconnecting switch is positive, and the fault current direction in the negative direction of the interconnecting switch is negative;
(b4) The downstream detection point of the fault point can detect overcurrent, the fault current direction on the distribution terminal in the positive direction of the interconnecting switch is negative, and the fault current direction in the negative direction of the interconnecting switch is positive; if the short-circuit current provided by the new energy source is smaller, the fault characteristics are shown in table 6.
(C4) When the branch line fails, the branch line fault current is positive; when the branch line is fault-free, the fault current is negative or zero.
The above features can be used to determine the fault section.
3. Contact switch closing, under the condition of new energy source inverting
Taking fig. 4 as an example, the normal load current and the fault current directions under the condition of closing the connecting switch (line cutting) are analyzed.
Normally, the current direction of each detection point is positive, and the fault current direction of each detection point is shown in table 7 below.
TABLE 7 load current direction under normal conditions
| Detecting point position | F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 |
| Direction of current flow | 1 | 1 | 1 | -1 | 1 | -1 | -1 | -1 | 0 |
Under normal conditions, the current direction on the distribution terminal in the positive direction of the tie switch is positive, the current direction on the distribution terminal in the negative direction of the tie switch is negative, and the current direction on the branch line is negative.
Assuming that DG1 and DG2 provide a short-circuit current to the fault point after the fault, the direction of the fault current at each of the detection points under different fault conditions is shown in table 8 below.
TABLE 8 fault current direction under the New energy providing short Circuit Current
| F1 | F2 | F3 | F4 | L1 | F7 | F8 | F6 | F5 | |
| F 1 Point failure | 1 | -1 | -1 | -1 | -1 | 1 | -1 | 0 | 0 |
| F 2 Point failure | 1 | 1 | 1 | -1 | -1 | 1 | -1 | 0 | 0 |
| F 3 Point failure | 1 | 1 | 1 | -1 | 1 | -1 | -1 | 0 | 0 |
| F 4 Point failure | 1 | 1 | 1 | -1 | 1 | -1 | 1 | 0 | 0 |
When the distributed new energy is connected and short-circuit current is provided for the fault point, the distribution characteristics of the fault current are as follows:
(a5) The upstream detection point of the fault point can detect overcurrent, the fault current direction on the distribution terminal in the positive direction of the interconnecting switch is positive, and the fault current direction in the negative direction of the interconnecting switch is negative;
(b5) The downstream detection point of the fault point can detect overcurrent, the fault current direction on the distribution terminal in the positive direction of the interconnecting switch is negative, and the fault current direction in the negative direction of the interconnecting switch is positive; if the short-circuit current provided by the new energy source is smaller, the fault characteristics are shown in table 8.
(C5) When the branch line fails, the branch line fault current is positive; when the branch line is fault-free, the fault current is negative or zero.
The above features can be used to determine the fault section.
Based on the above analysis, the method for locating the fault section of the power distribution network after the new energy is accessed in a large scale provided by the embodiment of the invention, see fig. 1, comprises the following steps:
acquiring the current magnitude and direction of all power distribution terminals flowing through a main line before a fault occurs and the current magnitude and direction of all power distribution terminals flowing through the main line after the fault occurs;
judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main road after the fault occurs;
determining a first fault section set for a power distribution terminal with overcurrent based on the current direction of a main line flowing through two adjacent power distribution terminals after the fault occurs;
Dividing the first fault section set into a second fault section set and a third fault section set according to the current direction flowing through two adjacent power distribution terminals after the fault occurs;
screening the second fault section set and the third fault section set based on current directions of two adjacent power distribution terminals before and after the fault occurs, so as to obtain a fourth fault section set;
and screening the fourth fault section set based on the current direction of the distribution terminal on the branch line of the main line after the fault occurs to determine the section where the fault point is located.
As a preferred embodiment, a fault current flow threshold is set, and if the collected fault current of the distribution terminal after occurrence of the fault is equal to or greater than the fault current flow threshold, it is determined that there is an overcurrent distribution terminal.
As a preferred embodiment, the sections upstream and downstream of the fault point are traversed in units of sections between two distribution terminals of the main line, and the corresponding sections are divided into a first set of fault sections if the fault current directions of the two distribution terminals are not identical.
As a preferred embodiment, traversing the sections in the first set of fault sections, and if the direction of fault currents of the two power distribution terminals of one section and the direction of fault currents of the two power distribution terminals are positive and negative, respectively, dividing the corresponding sections into the second set of fault sections;
If the current direction of the faults of the two power distribution terminals of one section is zero and only one is zero, the corresponding section is divided into a third set of fault sections.
As a preferred embodiment, traversing the sections in the second set of fault sections, and if the fault current direction and the pre-fault current direction of only one of the two power distribution terminals of one section are changed, dividing the corresponding section into a fourth set of fault sections;
Traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the fault current direction of the two power distribution terminals of one section is unchanged from the pre-fault current direction or the current direction of the pre-fault power distribution terminal is non-zero but the post-fault current direction is zero.
As a preferred embodiment, for the fault section in the fourth fault section set, it is determined whether or not a branch line exists,
If no branch line exists, determining that the fault point is located in the fault section;
if a branch line exists, and the current direction of a power distribution terminal on the branch line is a positive direction, determining that the fault point is located on the branch line;
otherwise, determining that the fault point is located on the trunk line.
Another embodiment of the present invention provides a fault section positioning device for a power distribution network after large-scale access of new energy, including:
the acquisition module is used for acquiring the magnitude and the direction of fault currents of all power distribution terminals on the main line before and after the fault;
The judging module is used for judging the power distribution terminal with overcurrent according to the obtained fault current of the power distribution terminal on the main line;
The first screening module is used for determining a first fault section set for the power distribution terminals with overcurrent based on fault current directions of two adjacent power distribution terminals on a main line;
the second screening module is used for dividing the first fault section set into a second fault section set and a third fault section set;
The third screening module is used for screening the second fault section set and the third fault section set based on the current direction of the power distribution terminal before the fault to obtain a fourth fault section set;
And
And the output module is used for screening the fourth fault section set based on fault current directions of two adjacent power distribution terminals on the branch line of the main line to determine the section where the fault point is located.
As a preferred embodiment, the first screening module is specifically adapted to,
And traversing the sections on the main line and the downstream sections by taking the section between the two power distribution terminals of the main line as a unit, and dividing the corresponding sections into a first fault section set if the fault current directions of the two power distribution terminals are inconsistent.
As a preferred embodiment, the second screening module is specifically adapted to,
Traversing the sections in the first fault section set, and dividing the corresponding sections into a second fault section set if the fault current directions of the two power distribution terminals of one section are positive and negative directions respectively;
if the fault current direction of two power distribution terminals of one section is zero and only one is zero, the corresponding section is divided into a third set of fault sections.
As a preferred embodiment, the third screening module is specifically adapted to,
Traversing the sections in the second fault section set, and dividing the corresponding section into a fourth fault section set if two power distribution terminals of one section have and only one fault current direction and the current direction before fault change;
Traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the fault current direction of the two power distribution terminals of one section is unchanged from the pre-fault current direction or the current direction of the pre-fault power distribution terminal is non-zero but the post-fault current direction is zero.
As a preferred embodiment, the output module is specifically adapted to,
Traversing the sections in the fourth fault section set, judging whether branch circuits exist,
If no branch line exists, determining that the fault point is located in the section;
if a branch line exists, and the current direction of one power distribution terminal in the section of the branch line is a positive direction, determining that the fault point is located in the branch line of the section; otherwise, determining that the fault point is located in the main line of the section.
A third embodiment of the invention provides a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods described herein.
A fourth embodiment of the present invention provides a computing device, comprising,
One or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods according to the foregoing.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, 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 apparatus 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 apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (8)
1. The power distribution network fault section positioning method is characterized by comprising the following steps of:
Acquiring the current magnitude and direction of all power distribution terminals flowing through a main line before a fault occurs and the current magnitude and direction of all power distribution terminals flowing through the main line after the fault occurs; the current flows from the main power supply to the power distribution terminal in a positive current direction, the current flowing through the power distribution terminal is 0 when the current is smaller than a preset current threshold, and the current flows from the power distribution terminal to the main power supply in a negative current direction;
judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main road after the fault occurs, comprising the following steps: if the current of the power distribution terminal after the fault occurs is greater than or equal to a preset fault current overcurrent threshold, judging that the overcurrent power distribution terminal exists;
for a power distribution terminal having an overcurrent, determining a first fault section set based on current directions flowing through two adjacent power distribution terminals on a main line after a fault occurs, including: traversing the sections on the main line and the downstream by taking the section between two adjacent distribution terminals on the main line as a unit, and dividing the corresponding section into a first fault section set if the current directions of the two distribution terminals of one section are inconsistent;
Dividing the first fault section set into a second fault section set and a third fault section set according to the current direction flowing through two adjacent power distribution terminals after the fault occurs, comprising: traversing the sections in the first fault section set, and dividing the corresponding sections into a second fault section set if the current directions of the two power distribution terminals of one section are positive and negative directions respectively; if the current directions of the two power distribution terminals of one section are zero and only one is zero, dividing the corresponding section into a third fault section set;
screening the second fault section set and the third fault section set based on current directions of two adjacent power distribution terminals before and after the fault occurs, so as to obtain a fourth fault section set;
and screening the fourth fault section set based on the current direction of the distribution terminal on the branch line of the main line after the fault occurs to determine the section where the fault point is located.
2. The method for locating a fault section of a power distribution network according to claim 1, wherein the screening the second fault section set and the third fault section set based on the current directions of two adjacent power distribution terminals before and after the fault occurrence respectively to obtain a fourth fault section set includes:
traversing the sections in the second fault section set, and dividing the corresponding section into a fourth fault section set if two power distribution terminals of one section have and only one current direction changes with the current direction before the fault occurs;
And traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the current directions of the two power distribution terminals of one section are unchanged compared with the current direction before the fault occurs, or the current direction of the power distribution terminal before the fault occurs is nonzero but the current direction after the fault occurs is zero.
3. The method for locating a fault section of a power distribution network according to claim 2, wherein the step of screening the fourth fault section set based on the current direction of the power distribution terminal on the branch line of the main line after the fault occurs to determine the section where the fault point is located includes:
traversing the sections in the fourth fault section set, judging whether branch circuits exist,
If no branch line exists, determining that the fault point is located in the section;
If a branch line exists, and the current direction of a power distribution terminal on the branch line is a positive direction, determining that a fault point is positioned on the branch line of the section;
Otherwise, determining that the fault point is located in the main line of the section.
4. Distribution network fault section positioner, its characterized in that includes:
The acquisition module is used for acquiring the current magnitude and direction of all the power distribution terminals flowing through the main line before the fault occurs and the current magnitude and direction of all the power distribution terminals flowing through the main line after the fault occurs;
The judging module is used for judging the power distribution terminal with overcurrent according to the obtained current of the power distribution terminal on the main road after the fault occurs;
The first screening module is used for determining a first fault section set for the power distribution terminals with overcurrent based on the current directions of two adjacent power distribution terminals flowing through a main line after faults occur, and the specific implementation mode is that the sections between the two adjacent power distribution terminals on the main line are taken as units, the sections on the main line and the downstream are traversed, if the current directions of the two power distribution terminals of one section are inconsistent, the corresponding sections are divided into the first fault section set, wherein the current flowing from a main power supply to the power distribution terminals is the positive current direction, the current flowing through the power distribution terminals is less than a preset current threshold, the current direction is 0, and the current flowing from the power distribution terminals to the main power supply is the negative current direction;
The second screening module is used for dividing the first fault section set into a second fault section set and a third fault section set according to the current directions of two adjacent power distribution terminals flowing through the main line after the fault occurs; traversing the sections in the first fault section set, and dividing the corresponding sections into the second fault section set if the current directions of the two power distribution terminals of one section are positive and negative directions respectively; if the current directions of the two power distribution terminals of one section are zero and only one is zero, dividing the corresponding section into a third fault section set;
The third screening module is used for screening the second fault section set and the third fault section set based on the current directions of two adjacent power distribution terminals before and after the fault occurs to obtain a fourth fault section set;
And
And the output module is used for screening the fourth fault section set based on the direction of the distribution terminal current of the phase on the branch line of the main line to determine the section where the fault point is located.
5. The power distribution network fault section locating device according to claim 4, wherein the third screening module is specifically configured to,
Traversing the sections in the second fault section set, and dividing the corresponding section into a fourth fault section set if two power distribution terminals of one section have and only one current direction changes with the current direction before the fault occurs;
traversing the sections in the third fault section set, and dividing the corresponding sections into a fourth fault section set if the current direction of the two power distribution terminals of one section is unchanged from the current direction before the fault occurs or the current direction of the power distribution terminals before the fault occurs is nonzero but the current direction after the fault occurs is zero.
6. The power distribution network fault section locating device according to claim 5, wherein the output module is specifically configured to,
Traversing the sections in the fourth fault section set, judging whether branch circuits exist,
If no branch line exists, determining that the fault point is located in the section;
If a branch line exists, and the current direction of a power distribution terminal on the branch line is a positive direction, determining that a fault point is positioned on the branch line of the section; otherwise, determining that the fault point is located in the main line of the section.
7. A computer readable storage medium storing one or more programs, characterized by: the one or more programs include instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-3.
8. A computing device, characterized by: comprising the steps of (a) a step of,
One or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods of claims 1-3.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026045A (en) * | 2016-06-28 | 2016-10-12 | 国网山东省电力公司济南供电公司 | Fault handling method for cable line comprising distributed power supply |
| CN109557422A (en) * | 2019-01-22 | 2019-04-02 | 山东大学 | A kind of intelligent power distribution network short circuit fault localization method and system |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026045A (en) * | 2016-06-28 | 2016-10-12 | 国网山东省电力公司济南供电公司 | Fault handling method for cable line comprising distributed power supply |
| CN109557422A (en) * | 2019-01-22 | 2019-04-02 | 山东大学 | A kind of intelligent power distribution network short circuit fault localization method and system |
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