CN111157842A - Power distribution line distribution transformer power failure fault studying and judging method based on power grid topology - Google Patents
Power distribution line distribution transformer power failure fault studying and judging method based on power grid topology Download PDFInfo
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- CN111157842A CN111157842A CN201911410116.1A CN201911410116A CN111157842A CN 111157842 A CN111157842 A CN 111157842A CN 201911410116 A CN201911410116 A CN 201911410116A CN 111157842 A CN111157842 A CN 111157842A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a power distribution line distribution transformer power failure fault studying and judging method based on power grid topology, and relates to the field of power grid fault judging methods. And the existing PMS2.0 fault study and judgment analysis of the national power grid can only realize the discrete analysis of various alarm data, the fault area and the power failure influence range are difficult to find only by depending on the power failure alarm event, the efficiency of manual investigation is low, and the fault area and the power failure range are difficult to accurately and quickly obtain. The method comprises the steps of firstly, constructing a switch tree of the power failure distribution transformer according to received power failure distribution transformer information and large feeder topology; then, performing breadth-first traversal on the switch tree, and analyzing a power failure switch; and finally, if 2 or more power failure areas exist, judging whether a power failure switch needs to be combined or not, and returning to the power failure switch. The method can realize rapid simulation of field fault conditions, realize initial positioning of the position of the fault equipment and automatic generation of fault power failure range information, has less adopted information and high analysis speed, and can rapidly find a fault area and a power failure influence range.
Description
Technical Field
The invention relates to the field of power grid fault judgment methods, in particular to a power distribution line distribution transformer power failure fault studying and judging method based on power grid topology.
Background
At present, with the great force of national grid companies to promote the development of intelligent power distribution networks, a great number of intelligent monitoring devices are installed on transformer substations, distribution network lines, distribution substations and low-voltage equipment, and a great amount of real-time data generated by the intelligent monitoring devices plays an important role in reflecting the operation state of a power grid and diagnosing the fault influence range. However, the real-time data are all discrete information, the accuracy is not high, time sequence differences exist in information from different sources, and the existing PMS2.0 fault study and judgment analysis of the national power grid can only realize the discrete analysis of various alarm data. Public transformer power failure events provided by intelligent public transformers and special transformer power failure events provided by power utilization acquisition systems are common power failure alarms, but the events are influenced by factors such as weather and networks, and a certain report missing rate exists. The fault area and the power failure influence range are difficult to find only by means of a power failure alarm event, the efficiency of manual investigation is low, and the fault area and the power failure range are difficult to accurately and quickly obtain.
Disclosure of Invention
The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme, and provide a distribution line distribution transformer power failure fault studying and judging method based on power grid topology, aiming at rapidly finding out a fault area and a power failure influence range. Therefore, the invention adopts the following technical scheme.
A power distribution line distribution transformer power failure fault studying and judging method based on power grid topology comprises the following steps:
1) finding out all possible power failure switches according to the power failure distribution and transformation information and the large feeder topology, counting the number of branch switches of each switch, and sequencing the switches according to the topology to form a switch tree;
2) performing breadth-first traversal on the switch tree according to the sequence from top to bottom, and analyzing a power failure switch;
3) judging whether the number of the power failure switches is 2, if not, returning to the power failure switches, and if so, executing the next step;
4) judging whether the power failure switches can be merged into the same power failure island or not, if not, returning to 2 power failure switches, and if so, executing the next step;
5) the power failure switches are combined into a power failure island.
The method is used for carrying out distribution transformer power failure research and judgment on the basis of public transformer power failure events provided by an intelligent public transformer and special transformer power failure events provided by a power utilization acquisition system, under the condition of lacking of a switch state, on-site fault conditions are quickly simulated on the basis of power grid topology, the primary positioning of the position of a fault device and the automatic generation of fault power failure range information are realized, a power failure starting switch is analyzed, and the condition of suspected fault information is generated.
As a preferable technical means: in the step 1), when the number of branch switches of a certain switch is counted, only the switch with the distribution transformer at the back is counted, and the switch without the distribution transformer at the back is not counted. Excluding switches without transformers.
As a preferable technical means: in the step 1), if a switch tree cannot be formed, namely all the public switches of the power failure distribution transformer cannot be found, judging that the topology has errors and returning. And eliminating the situation that the topology has errors.
As a preferable technical means: in the step 1), if a loop or multiple power supplies exist in the circuit, an error is directly reported and returned. Excluding the case where a loop or multiple power supplies are present on the line.
As a preferable technical means: in the step 2), if the number of the lower-level switches of a certain switch in the switch tree is more than or equal to 3, the switch is judged to be a power failure switch, and the lower-level switches are not analyzed; if the number of the lower-level switches of a certain switch in the fruit tree =1, judging that the switch is not a power failure switch, skipping over the switch, and continuing to analyze the lower-level switch; if the number of the lower-level switches of a certain switch in the fruit tree = 0, judging that the switch is a power failure switch; and if the number of the lower-level switches of a certain switch in the fruit tree = 2, the first node of the tree is the root node. The analysis of the tree switches in the sequence from top to bottom is effectively realized.
As a preferable technical means: if the node is the root node, judging that the switch is not powered off, and continuously analyzing the switches at the lower levels; if the node is not the root node, the switch is judged to be powered off, and the switch at the next stage is not analyzed. The number of the finally found power failure switches is ensured to be less than or equal to 2.
As a preferable technical means: and 4) respectively moving upwards from the two power failure switches to judge whether the father node has power failure, if the father node has power failure, continuing to judge upwards until the root node switch is judged to have power failure, and judging that the power failure switches can be combined. Whether the power failure switches can be combined or not is effectively judged.
As a preferable technical means: and when judging whether the father node has power failure, if the total number of the branch switches =1, the power failure is judged, and if not, the power failure is judged. And the judgment of whether the father node has power failure or not is effectively realized.
As a preferable technical means: and when judging whether the root node has power failure, if the total number of the branch switches is less than or equal to 3, the power failure is judged, and if not, the power failure is judged. And the judgment of whether the root node has power failure or not is effectively realized.
Has the advantages that: the method is used for carrying out distribution transformer power failure research and judgment on the basis of public transformer power failure events provided by an intelligent public transformer and special transformer power failure events provided by a power utilization acquisition system, under the condition of lacking of a switch state, on-site fault conditions are quickly simulated on the basis of power grid topology, the primary positioning of fault equipment positions and the automatic generation of fault power failure range information are realized, a power failure starting switch is analyzed, and the condition of suspected fault information is generated.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Fig. 2 is a single line diagram of a feeder in step 1) of the present invention.
FIG. 3 is a schematic diagram of the switch tree in step 1) of the present invention.
FIG. 4 is a schematic diagram of a partial switch tree for determining whether the blackout switches can be combined according to the present invention.
Fig. 5 is a single line schematic diagram of an embodiment of a feeder specific switch fault investigation process of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
Example one
As shown in fig. 1, a method for studying and determining a power failure fault of a distribution line distribution transformer based on a power grid topology includes the following steps:
1) finding out all possible power failure switches according to the power failure distribution and transformation information and the large feeder topology, counting the number of branch switches of each switch, and sequencing the switches according to the topology to form a switch tree, wherein a certain feeder single line diagram is shown in FIG. 2, the numbers 1-13 in the diagram represent possible power failure switches, A, B, C, D and E in the diagram are assumed power failure distribution and transformation, the established corresponding topology relation switch tree is shown in FIG. 3, in the switch tree, nodes of the tree represent switches, the numbers in the nodes are the switch numbers respectively 1-13, connecting lines between the nodes represent the upper and lower level topology relation of the switches, the closer to a power supply point, the numbers outside the nodes are the number of all branch switches under the node switch;
2) performing breadth-first traversal on the switch tree according to the sequence from top to bottom, and analyzing a power failure switch;
3) judging whether the number of the power failure switches is 2, if not, returning to the power failure switches, and if so, executing the next step;
4) judging whether the power failure switches can be merged into the same power failure island or not, if not, returning to 2 power failure switches, and if so, executing the next step;
5) the power failure switches are combined into a power failure island.
In order to eliminate switches without distribution transformers, in step 1), when the number of branch switches of a certain switch is counted, only the switches with distribution transformers behind are counted, and the switches without distribution transformers behind are not counted. Excluding switches without transformers.
In order to eliminate the situation that the topology has errors, in step 1), if a switch tree cannot be formed, that is, all the public switches of the power failure distribution transformer cannot be found, the topology is judged to have errors, and the process returns. And eliminating the situation that the topology has errors.
In order to eliminate the condition that a loop or multiple power supplies exist in the line, in the step 1), if the loop or multiple power supplies exist in the line, an error is directly reported back. Excluding the case where a loop or multiple power supplies are present on the line.
In order to realize the analysis of the switches on the tree, in the step 2), if the number of the lower-level switches of a certain switch in the switch tree is more than or equal to 3, the switch is judged to be a power failure switch, and the lower-level switches are not analyzed any more; if the number of the lower-level switches of a certain switch in the fruit tree =1, judging that the switch is not a power failure switch, skipping over the switch, and continuing to analyze the lower-level switch; if the number of the lower-level switches of a certain switch in the fruit tree = 0, judging that the switch is a power failure switch; and if the number of the lower-level switches of a certain switch in the fruit tree = 2, the first node of the tree is the root node. If the node is the root node, judging that the switch is not powered off, and continuously analyzing the switches at the lower levels; if the node is not the root node, the switch is judged to be powered off, and the switch at the next stage is not analyzed. The method effectively realizes the analysis of the switches on the tree in the sequence from top to bottom, and ensures that the number of the finally found power failure switches is less than or equal to 2.
In order to realize whether the power failure switches can be combined or not, in the step 4), the two power failure switches are respectively moved upwards to judge whether the father node has power failure or not, if the father node has power failure, the ascending judgment is continued until the root node switch is judged to have power failure, and the power failure switches can be combined. Whether the power failure switches can be combined or not is effectively judged.
In order to judge whether the father node has power failure or not, when judging whether the father node has power failure or not, if the total number of the branch switches =1, the power failure is judged, and if not, the power failure is judged. And the judgment of whether the father node has power failure or not is effectively realized.
In order to judge whether the root node has power failure or not, when judging whether the root node has power failure or not, if the total number of the branch switches is less than or equal to 3, the power failure is determined, and if not, the power failure is determined. And the judgment of whether the root node has power failure or not is effectively realized.
As shown in fig. 4, the two blackout switches are 8 and 11, the analysis switch 11 is first used, the father node switch 10 has only 1 branch switch, and therefore, the power failure is judged 10, and the father node switch 2 of the reanalysis switch 10 has 4 branch switches, and therefore, the judgment switch 2 does not stop the power failure, the analysis is stopped, and the two blackout switches 8 and 11 are returned.
Because the probability of tripping the 3 switches at the same time is very small, the maximum number of the power failure switches researched and judged by the method is limited to 2.
The following is an embodiment of a process for determining a fault of a specific switch of a feeder.
Fig. 5 is a single-line schematic diagram of a feeder line, and power failure occurs when power distribution transformers a, b and c are received, wherein numbers 1-6 are switch numbers.
After the distribution transformer power failure information is received, the switches 1-6 construct a switch tree according to the upper and lower level relation according to the large feeder topological structure.
Traversing from the root node switch 1, and judging that the switch is not powered off by a switch 2 and a switch 4 arranged behind the switch 1; judging the power failure of the switch 3; the switch 4 is judged to be powered off.
Traversing from the switch 3 to the network, judging the switch 2, judging the switch 1 continuously upwards when only 1 branch line of the switch 2 is provided; and 2 branch lines of the switch 1 are equal to the number of the fault areas, and the power failure of the switch 1 is judged.
Continuing the upward traversal from switch 1, but with switch 1 already being the root node, return to switch 1, i.e., eventually merge into the failed switch as switch 1. According to the power grid topology, the final analysis result is that the switch 1 is a suspected fault switch, and the power failure range is arranged on the rear side of the switch.
The method is used for carrying out distribution transformer power failure research and judgment on the basis of public transformer power failure events provided by an intelligent public transformer and special transformer power failure events provided by a power utilization acquisition system, under the condition of lacking of a switch state, on-site fault conditions are quickly simulated on the basis of power grid topology, the primary positioning of the position of a fault device and the automatic generation of fault power failure range information are realized, a power failure starting switch is analyzed, and the condition of suspected fault information is generated.
The method for studying and judging the power failure fault of the distribution line distribution transformer based on the power grid topology shown in fig. 1 to 5 is a specific embodiment of the present invention, has the outstanding substantive features and obvious progress of the present invention, and can make equivalent modifications in the aspects of shape, structure and the like according to the practical use requirements and under the teaching of the present invention, which are all within the protection scope of the present scheme.
Claims (9)
1. A power distribution line distribution transformer power failure fault studying and judging method based on power grid topology is characterized by comprising the following steps:
1) finding out all possible power failure switches according to the power failure distribution and transformation information and the large feeder topology, counting the number of branch switches of each switch, and sequencing the switches according to the topology to form a switch tree;
2) performing breadth-first traversal on the switch tree according to the sequence from top to bottom, and analyzing a power failure switch;
3) judging whether the number of the power failure switches is 2, if not, returning to the power failure switches, and if so, executing the next step;
4) judging whether the power failure switches can be merged into the same power failure island or not, if not, returning to 2 power failure switches, and if so, executing the next step;
5) the power failure switches are combined into a power failure island.
2. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 1, wherein the method comprises the following steps: in the step 1), when the number of branch switches of a certain switch is counted, only the switch with the distribution transformer at the back is counted, and the switch without the distribution transformer at the back is not counted.
3. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 1, wherein the method comprises the following steps: in the step 1), if a switch tree cannot be formed, namely all the public switches of the power failure distribution transformer cannot be found, judging that the topology has errors and returning.
4. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 1, wherein the method comprises the following steps: in the step 1), if a loop or multiple power supplies exist in the circuit, an error is directly reported and returned.
5. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 1, wherein the method comprises the following steps: in the step 2), if the number of the lower-level switches of a certain switch in the switch tree is more than or equal to 3, the switch is judged to be a power failure switch, and the lower-level switches are not analyzed; if the number of the lower-level switches of a certain switch in the fruit tree =1, judging that the switch is not a power failure switch, skipping over the switch, and continuing to analyze the lower-level switch; if the number of the lower-level switches of a certain switch in the fruit tree = 0, judging that the switch is a power failure switch; and if the number of the lower-level switches of a certain switch in the fruit tree = 2, the first node of the tree is the root node.
6. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 5, wherein the method comprises the following steps: if the node is the root node, judging that the switch is not powered off, and continuously analyzing the switches at the lower levels; if the node is not the root node, the switch is judged to be powered off, and the switch at the next stage is not analyzed.
7. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 1, wherein the method comprises the following steps: and 4) respectively moving upwards from the two power failure switches to judge whether the father node has power failure, if the father node has power failure, continuing to judge upwards until the root node switch is judged to have power failure, and judging that the power failure switches can be combined.
8. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 7, wherein the method comprises the following steps: and when judging whether the father node has power failure, if the total number of the branch switches =1, the power failure is judged, and if not, the power failure is judged.
9. The method for studying and judging the power failure of the distribution line distribution transformer based on the power grid topology according to claim 7, wherein the method comprises the following steps: and when judging whether the root node has power failure, if the total number of the branch switches is less than or equal to 3, the power failure is judged, and if not, the power failure is judged.
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