CN115343587A - Distribution network hidden danger early warning method, device, equipment and storage medium - Google Patents
Distribution network hidden danger early warning method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a storage medium for early warning of hidden troubles of a distribution network, wherein the method comprises the steps of receiving traveling wave current, power frequency current and power frequency voltage sent by a monitoring device, and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not; marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line or not is judged, the insulation hidden dangers existing in the line can be effectively monitored, line patrol personnel are timely informed of the condition of the hidden dangers of the line, the hidden dangers of the line are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave current of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, and the speed and the efficiency of early warning of the hidden dangers of a distribution network are improved.
Description
Technical Field
The invention relates to the technical field of distribution line monitoring, in particular to a distribution network hidden danger early warning method, device, equipment and storage medium.
Background
Distribution lines are affected by factors such as natural environment, operation age and the like, and besides faults with obvious fault characteristics such as short circuit and grounding frequently occur, insulation hidden dangers such as abnormal discharge of a transformer and fine breakage of an insulating porcelain insulator exist on the lines; if the hidden danger is not eliminated in time, the hidden danger can be developed into an actual fault to cause the tripping and power failure of a line switch, so that the loss is brought to the lives of people; the partial fault occurrence of the distribution line is a progressive process, and the initial tiny abnormal state gradually develops into an abnormal state which has a certain threat degree on the distribution line, and further develops into the distribution line fault; the existing distribution line fault monitoring technology and method mainly aim at actual short-circuit faults and ground faults and cannot effectively monitor line hidden dangers.
Disclosure of Invention
The invention mainly aims to provide a distribution network hidden danger early warning method, a distribution network hidden danger early warning device, distribution network hidden danger early warning equipment and a storage medium, and aims to solve the technical problem that in the prior art, the hidden danger of a line cannot be effectively monitored only by monitoring actual short-circuit faults and ground faults.
In a first aspect, the invention provides a distribution network hidden danger early warning method, which comprises the following steps:
receiving traveling wave current, power frequency current and power frequency voltage sent by a monitoring device, and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not;
marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon;
and counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and judging whether the current line has hidden danger or not according to the similarity.
Optionally, the receiving traveling wave current, power frequency current, and power frequency voltage sent by the monitoring device, and determining whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon includes:
selecting a plurality of point positions according to a power distribution network line topological structure, and installing monitoring devices for early warning of hidden troubles of a distribution network;
receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device;
and judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
Optionally, the determining whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon includes:
when the variation of the traveling wave current is larger than a preset variation threshold, uploading the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period to a background;
and judging whether the power frequency current and/or the power frequency voltage have sudden change phenomena or not in the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
Optionally, the marking the current traveling wave current when there is no sudden change in the power frequency current and/or the power frequency voltage includes:
and marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no sudden change phenomenon of sudden increase or sudden decrease.
Optionally, the counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and determining whether there is a hidden danger in the current line according to the similarity, includes:
counting the traveling wave current waveforms of the marked traveling wave current within preset counting time, and determining the similarity between every two traveling wave current waveforms;
when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line;
and when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
Optionally, the counting traveling wave current waveforms of the marked traveling wave currents within a preset counting time to determine similarity between every two traveling wave current waveforms includes:
counting the traveling wave current amplitudes of the marked traveling wave current at the starting time, the middle time and the ending time within each period of preset counting time;
fitting a current curve in each time period according to the traveling wave current amplitude to obtain a starting time slope, a middle time slope and an ending time slope;
and determining a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
Optionally, the determining a corresponding slope matrix according to the starting time slope, the intermediate time slope, and the ending time slope, and determining a similarity between two traveling wave current waveforms according to the slope matrix include:
generating a corresponding slope matrix according to the initial time slope, the intermediate time slope and the ending time slope and according to a preset matrix format;
and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
In a second aspect, to achieve the above object, the present invention further provides a device for early warning of hidden troubles of a distribution network, where the device for early warning of hidden troubles of a distribution network includes:
the receiving module is used for receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not;
the marking module is used for marking the current traveling wave current when the power frequency current and/or the power frequency voltage has no mutation phenomenon;
and the judging module is used for counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms and judging whether the current line has hidden danger according to the similarity.
In order to achieve the above object, the present invention further provides a device for early warning of hidden dangers of a distribution network, where the device for early warning of hidden dangers of a distribution network includes: the early warning method comprises a memory, a processor and a distribution network hidden danger early warning program which is stored in the memory and can run on the processor, wherein the distribution network hidden danger early warning program is configured to realize the steps of the early warning method.
In a fourth aspect, in order to achieve the above object, the present invention further provides a storage medium, where the storage medium stores a distribution network hidden danger early warning program, and the distribution network hidden danger early warning program, when executed by a processor, implements the above steps of the distribution network hidden danger early warning method.
According to the early warning method for the hidden danger of the distribution network, whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon or not is judged by receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device; when the power frequency current and/or the power frequency voltage have/has no mutation phenomenon, marking the current traveling wave current; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line is judged, the insulation hidden dangers existing in the line can be effectively monitored, line patrol personnel are informed of the situation of the hidden dangers in time, the line hidden dangers are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave currents of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, and the speed and the efficiency of early warning of the hidden dangers of a distribution network are improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus architecture of a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a first embodiment of a distribution network hidden danger early warning method according to the present invention;
fig. 3 is a schematic flow chart of a distribution network hidden danger early warning method according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart of a third embodiment of the early warning method for the hidden danger of the distribution network according to the present invention;
fig. 5 is a schematic flow chart of a fourth embodiment of the early warning method for the hidden danger of the distribution network according to the present invention;
fig. 6 is a schematic flowchart of a fifth embodiment of a distribution network hidden danger early warning method according to the present invention;
FIG. 7 is a flow chart of a distribution network hidden danger early warning method based on a traveling wave current curve form in the distribution network hidden danger early warning method of the present invention;
fig. 8 is a schematic flow chart of a sixth embodiment of the early warning method for the hidden danger of the distribution network according to the present invention;
fig. 9 is a flow chart of the traveling wave current curve form similarity determination in the early warning method for the hidden danger of the distribution network according to the present invention;
fig. 10 is a functional block diagram of a first embodiment of the early warning device for hidden troubles of distribution networks according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon or not by receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device; marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line or not is judged, the insulation hidden dangers existing in the line can be effectively monitored, line hidden danger conditions of line patrol personnel are timely informed, line hidden dangers are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave current of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, the speed and the efficiency of early warning of the hidden dangers of the distribution network are improved, the technical problem that in the prior art, the hidden dangers of the line can only be monitored aiming at actual short-circuit faults and ground faults and cannot be effectively monitored is solved.
Referring to fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, e.g. a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., a Wi-Fi interface). The Memory 1005 may be a high-speed RAM Memory or a Non-Volatile Memory (Non-Volatile Memory), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001 described previously.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 1 is not intended to be limiting of the apparatus and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005 as a storage medium may include an operating device, a network communication module, a user interface module, and a distribution network hidden danger warning program.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and executes the following operations:
receiving traveling wave current, power frequency current and power frequency voltage sent by a monitoring device, and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not;
marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon;
and counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and judging whether the current line has hidden danger or not according to the similarity.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
selecting a plurality of point positions according to a power distribution network line topological structure, and installing monitoring devices for early warning of hidden troubles of a distribution network;
receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device;
and judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
when the variation of the traveling wave current is larger than a preset variation threshold, uploading the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period to a background;
and judging whether the power frequency current and/or the power frequency voltage have sudden change phenomena or not by the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
and marking the current traveling wave current when the power frequency current and/or the power frequency voltage has no sudden change phenomenon of sudden increase or sudden decrease.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
counting the traveling wave current waveforms of the marked traveling wave current within preset counting time, and determining the similarity between every two traveling wave current waveforms;
when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line;
and when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
counting the traveling wave current amplitudes of the marked traveling wave current at the starting time, the middle time and the ending time within each period of preset counting time;
fitting a current curve in each time period according to the traveling wave current amplitude value to obtain a starting time slope, a middle time slope and an ending time slope;
and determining a corresponding slope matrix according to the initial time slope, the middle time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
The device calls a distribution network hidden danger early warning program stored in a memory 1005 through a processor 1001, and also executes the following operations:
generating a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope and a preset matrix format;
and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
According to the scheme, whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon is judged by receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device; marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line or not is judged, the insulation hidden dangers existing in the line can be effectively monitored, line patrol personnel are timely informed of the condition of the hidden dangers of the line, the hidden dangers of the line are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave current of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, and the speed and the efficiency of early warning of the hidden dangers of a distribution network are improved.
Based on the hardware structure, the embodiment of the distribution network hidden danger early warning method is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a distribution network hidden danger early warning method according to the present invention.
In a first embodiment, the early warning method for the hidden troubles of the distribution network comprises the following steps:
and S10, receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device, and judging whether the power frequency current and/or the power frequency voltage have mutation phenomena or not.
It should be noted that the monitoring device may monitor the current line to obtain the traveling wave current, the power frequency current, and the power frequency voltage of the current line, and after receiving the traveling wave current, the power frequency current, and the power frequency voltage sent by the monitoring device, may determine whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
And S20, marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon.
It can be understood that the current traveling wave current may be marked when there is no abrupt change in the power frequency current and/or the power frequency voltage.
And S30, counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and judging whether hidden dangers exist in the current line according to the similarity.
It should be understood that the marked traveling wave current waveforms can be counted after marking, and then the similarity between every two traveling wave current waveforms is compared, so that whether hidden dangers exist in the current line or not is judged according to the similarity.
According to the scheme, whether the power frequency current and/or the power frequency voltage have mutation phenomena or not is judged by receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device; when the power frequency current and/or the power frequency voltage have/has no mutation phenomenon, marking the current traveling wave current; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line or not is judged, the insulation hidden dangers existing in the line can be effectively monitored, line patrol personnel are timely informed of the condition of the hidden dangers of the line, the hidden dangers of the line are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave current of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, and the speed and the efficiency of early warning of the hidden dangers of a distribution network are improved.
Further, fig. 3 is a schematic flowchart of a second embodiment of the early warning method for hidden dangers of a distribution network according to the present invention, and as shown in fig. 3, the second embodiment of the early warning method for hidden dangers of a distribution network according to the present invention is provided based on the first embodiment, and in this embodiment, the step S10 includes the following steps:
and S11, selecting a plurality of point positions according to a power distribution network line topological structure, and installing a monitoring device for early warning of hidden dangers of a power distribution network.
It should be noted that, a plurality of point locations can be selected to install the monitoring device through the preset topology structure of the power distribution network line, that is, the distribution network hidden danger early warning device is installed.
And S12, receiving the traveling wave current, the power frequency current and the power frequency voltage of the current line collected by the monitoring device.
It can be understood that the line power frequency current, power frequency voltage and high-frequency traveling wave current of the current line can be collected through the monitoring device, and then the traveling wave current, the power frequency current and the power frequency voltage of the current line can be collected through the monitoring device.
And S13, judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon.
It should be understood that after the traveling wave current, the power frequency current and the power frequency voltage of the current line are obtained, whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon can be quickly judged.
According to the scheme, a plurality of point positions are selected according to the topological structure of the power distribution network line, and the monitoring device for early warning of the hidden danger of the power distribution network is installed; receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device; and judging whether the power frequency current and/or the power frequency voltage have mutation phenomena or not, effectively monitoring the potential insulation hazard of the circuit, timely informing inspection personnel of the potential line hazard condition, and preventing the potential line hazard from developing into an actual fault.
Further, fig. 4 is a schematic flow chart of a third embodiment of the early warning method for hidden dangers of a distribution network according to the present invention, and as shown in fig. 4, the third embodiment of the early warning method for hidden dangers of a distribution network according to the present invention is provided based on the second embodiment, and in this embodiment, the step S13 specifically includes the following steps:
and S131, uploading the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period to a background when the variation of the traveling wave current is larger than a preset variation threshold.
It should be noted that the variation of the traveling wave current is compared with the preset variation threshold polarity, and whether the traveling wave current, the power frequency current and the power frequency voltage are uploaded to the background can be determined according to the comparison result, and when the variation of the traveling wave current is greater than the preset variation threshold, the traveling wave current, the power frequency current and the power frequency voltage in the preset trigger time period can be uploaded to the background.
In specific implementation, when monitoring that the line traveling wave current variation is larger than a set threshold, the monitoring device transmits the traveling wave current, the power frequency current and the power frequency voltage within 500us after the triggering time to the background.
And S132, judging whether sudden change phenomena exist in the power frequency current and/or the power frequency voltage or not by the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
It can be understood that after the traveling wave current, the power frequency current and the power frequency voltage are uploaded to the background server, whether the amplitude of the uploaded power frequency current and power frequency voltage has a sudden increase or sudden decrease phenomenon can be judged through the background server.
According to the technical scheme, when the variation of the traveling wave current is larger than a preset variation threshold, the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period are uploaded to a background; the backstage is judged power frequency current and/or whether power frequency voltage has sudden change phenomenon, sudden change phenomenon includes sudden increase and sudden drop, can effectively monitor the insulating hidden danger that the circuit exists, in time informs the inspection personnel circuit hidden danger condition, prevents that circuit hidden danger from developing into actual trouble at last, has promoted the speed and the efficiency of joining in marriage net hidden danger early warning.
Further, fig. 5 is a schematic flowchart of a fourth embodiment of the early warning method for hidden dangers of distribution networks according to the present invention, and as shown in fig. 5, the fourth embodiment of the early warning method for hidden dangers of distribution networks according to the present invention is provided based on the first embodiment, and in this embodiment, the step S20 specifically includes the following steps:
and S21, when the power frequency current and/or the power frequency voltage have no sudden change phenomenon of sudden increase or sudden decrease, marking the current traveling wave current.
It should be noted that the background determines whether there is a sudden increase or a sudden decrease in the uploaded power frequency current and power frequency voltage amplitude, and if not, marks the uploaded traveling wave current, which may be generally denoted as P L (L =1, 2.. Multidot.n), otherwise, it is considered that the line is in fault or the line switch action causes the load increase or the power failure, and the subsequent step judgment is ended, and the waveform is deleted.
Through the scheme, the power frequency current and/or when the sudden change phenomenon of sudden increase or sudden decrease does not exist in the power frequency voltage, the current traveling wave current is marked, the insulation hidden danger existing in the line can be effectively monitored, line patrol personnel are timely informed of the condition of the hidden danger of the line, the hidden danger of the line is prevented from being finally developed into an actual fault, the operation reliability of the line is improved, and the accuracy of early warning of the hidden danger of the distribution network is improved.
Further, fig. 6 is a schematic flowchart of a fifth embodiment of the early warning method for hidden dangers of a distribution network according to the present invention, and as shown in fig. 6, the fifth embodiment of the early warning method for hidden dangers of a distribution network according to the present invention is provided based on the first embodiment, and in this embodiment, the step S30 specifically includes the following steps:
and S31, counting the traveling wave current waveforms of the marked traveling wave currents within preset counting time, and determining the similarity between every two traveling wave current waveforms.
It should be noted that, by counting the traveling wave current waveforms of the marked traveling wave current within the preset counting time, the similarity between every two traveling wave current waveforms can be determined according to the counting result.
In a specific implementation, as shown in fig. 7, fig. 7 is a flow chart of a distribution network hidden danger early warning method based on a traveling wave current curve form in the distribution network hidden danger early warning method of the present invention, and referring to fig. 7, if a monitoring device monitors that a line traveling wave current variation is greater than a set threshold, a trigger time will be setAnd then transmitting the traveling wave current, the power frequency current and the power frequency voltage to a background within 500us, and judging whether the amplitude of the transmitted power frequency current and power frequency voltage has sudden increase or sudden decrease phenomenon by the background. If not, marking the uploaded traveling wave current as P L (L =1, 2.. Multidot.n), otherwise, considering that the line has a fault or the line switch action causes the load increase or power failure, and ending the judgment of the subsequent steps and deleting the waveform; counting the waveform of the traveling wave current marked in 1 minute in the waveform uploaded by the device, and representing the waveform by an array P, wherein P = [ ] 1 ，P 2 ，...，P L ]Comparing the similarity between every two of all marked traveling wave current waveforms, and if a plurality of groups of traveling wave current waveforms are similar within 1 minute, determining that the line has hidden danger; the specific numerical value of the preset statistical time can be set according to requirements, and the smaller the numerical value is, the higher the system sensitivity is.
And S32, judging that hidden danger exists in the current line when the similarity is larger than a preset similarity threshold.
It should be understood that when the similarity is greater than a preset similarity threshold, it may be determined that a hidden danger exists in the current line.
And S33, when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
It can be understood that when the similarity is not greater than the preset similarity threshold, it may be determined that no hidden danger exists in the current line.
According to the scheme, the similarity between every two traveling wave current waveforms is determined by counting the traveling wave current waveforms of the marked traveling wave currents within the preset counting time; when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line; the similarity is not greater than when presetting the similarity threshold value, judge there is not hidden danger in the current circuit, can effectively monitor the insulating hidden danger that the circuit exists, in time inform patrolman circuit hidden danger condition, prevent that circuit hidden danger from developing into actual fault at last, improved circuit operational reliability, improved the accuracy of joining in marriage net hidden danger early warning.
Further, fig. 8 is a schematic flowchart of a sixth embodiment of the early warning method for hidden dangers of distribution networks according to the present invention, and as shown in fig. 8, the sixth embodiment of the early warning method for hidden dangers of distribution networks according to the present invention is provided based on the fifth embodiment, and in this embodiment, the step S31 specifically includes the following steps:
and step S311, counting the traveling wave current amplitudes of the marked traveling wave current at the starting time, the middle time and the ending time in each period of time within preset counting time.
It should be noted that the current amplitudes of the traveling wave current corresponding to the start time, the middle time and the end time in each period of time are counted.
In a specific implementation, as shown in fig. 9, fig. 9 is a flow chart of determining the similarity of the traveling wave current curve forms in the early warning method for hidden danger in distribution network according to the present invention, and referring to fig. 9, any two traveling wave current waveforms are taken from the traveling wave current waveforms marked within 1 minute of statistics and recorded as the traveling wave current waveforms
、
，
、
Belongs to P; current of travelling wave
And
respectively equally dividing the time into n time periods according to the time scale, wherein the n value can be set according to the requirement, the larger the n value is, the higher the accuracy of the judgment result is, but the larger the calculation amount of the corresponding system is; respectively extracting traveling wave currents
And
the starting time, the middle time and the ending time in each period of time and the traveling wave current amplitudes corresponding to the starting time, the middle time and the ending time are used as an array
And
represents;
wherein,
respectively travelling wave current
The initial time, the intermediate time and the end time in the nth period of time,
are travelling wave currents, respectively
The traveling wave current amplitudes corresponding to the initial time, the middle time and the end time in the nth period of time,
respectively travelling wave current
The initial time, the middle time and the end time in the nth period of time,
respectively travelling wave current
And the traveling wave current amplitudes corresponding to the initial time, the middle time and the end time in the nth period of time.
And S312, fitting a current curve in each time period according to the traveling wave current amplitude to obtain a starting time slope, a middle time slope and an ending time slope.
It should be understood that the starting time slope, the intermediate time slope, and the ending time slope may be obtained by fitting the current curves in each time segment with the traveling wave current amplitude.
In specific implementation, a quadratic polynomial is adopted to carry out the wave current
And
fitting the current curves of all the time periods, and respectively obtaining the slopes k corresponding to the starting time, the middle time and the ending time. The specific process is as follows:
let a quadratic polynomial
y=ax 2 +bx+c （1）
To be obtained
In the formula (1), n different curve equations are obtained and recorded as
. To be obtained
In the formula (1), n different curve equations can be obtained and recorded as
The derivation is carried out on each curve function to obtain
。
Will be provided with
Bringing into corresponding derivation equations
In the method, the slopes corresponding to the start time, the intermediate time and the end time in each time period are obtained. This can be represented by a 3 x n matrix M, where the n-th row represents the travelling wave current
The slope corresponding to the starting time, the middle time and the ending time within the nth period of time; in the same way, will
By introducing corresponding derivation equations
Calculating the corresponding slopes of the starting time, the middle time and the ending time in each time period; this can be represented by a 3 x N matrix N, where the N-th row represents the travelling wave current
And the slope corresponding to the starting time, the middle time and the ending time in the nth period of time.
Step S313, determining a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
It can be understood that a corresponding slope matrix can be constructed by the starting time slope, the intermediate time slope and the ending time slope, and the similarity between every two traveling wave current waveforms is determined by the slope matrix.
In a specific implementation, the traveling wave current waveform is judged according to equation (2)
Sum traveling wave current waveform
If the slopes corresponding to the start time, the middle time and the end time in the same period are not opposite, and if the slope in the existing period does not satisfy the formula (2), the waveforms of the two traveling waves in the period are considered to be dissimilar, and meanwhile, the KL divergence judgment operation is not performed in the period.
Judging the waveform of the traveling wave current according to the formula (3)
Slope matrix M and traveling wave current waveforms
Whether the product of the same positions of the slope matrix N is equal to 0; if the slope is equal to the slope, the subsequent steps are not carried out in the time period.
Further, the step S313 specifically includes the following steps:
generating a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope and a preset matrix format;
and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
In specific implementation, the KL divergence is used for judging the waveform similarity of the slope matrix M and the slope matrix N in the same time period.
In the formula, D i As a travelling wave current
And a traveling wave current
The divergence of KL in the same time segment is used to describe the waveform similarity of the time segment.
According to the formula (4), D i The closer to zero, the higher the similarity of the two traveling wave waveforms in the i time period, and in practical application, a limited threshold value can be set, and in the threshold value range, the waveforms in the time period are considered to be similar, otherwise, the waveforms are not similar.
According to the statistical proportion of the dissimilar section of the two traveling wave waveforms to the total effective section, if the ratio is greater than a set threshold value, the traveling wave current is considered to be
And a traveling wave current
The wave forms are similar, otherwise, the traveling wave current is
And a traveling wave current
The waveforms are not similar, and in this case, the traveling wave waveform may be a traveling wave that is in series outside the distribution line.
Wherein u is the number of waveform dissimilarity periods, and v is the KL divergenceThe number of time periods meeting the threshold value setting, w is the traveling wave current
And a traveling wave current
The proportion of the dissimilar section to the total effective section can be set according to requirements, the w value is 0-1, and the larger the value is, the higher the overall similarity of the two-line wave forms is.
According to the scheme, the traveling wave current amplitudes of the starting time, the middle time and the ending time of the marked traveling wave current in each period of time in the preset statistical time are counted; fitting a current curve in each time period according to the traveling wave current amplitude value to obtain a starting time slope, a middle time slope and an ending time slope; according to the method, the corresponding slope matrix is determined according to the initial time slope, the middle time slope and the end time slope, the similarity between every two traveling wave current waveforms is determined according to the slope matrix, the insulation hidden danger existing in the line can be effectively monitored, line patrol personnel are timely informed of the situation of the line hidden danger, the line hidden danger is prevented from being finally developed into an actual fault, the operation reliability of the line is improved, and the accuracy of early warning of the hidden danger of the distribution network is improved.
Correspondingly, the invention further provides a distribution network hidden danger early warning device.
Referring to fig. 10, fig. 10 is a functional block diagram of a first embodiment of a distribution network hidden danger warning device according to the present invention.
In a first embodiment of the early warning device for hidden dangers of the distribution network, the early warning device for hidden dangers of the distribution network comprises:
and the receiving module 10 is used for receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon.
And the marking module 20 is configured to mark the current traveling wave current when the power frequency current and/or the power frequency voltage has no sudden change.
And the judging module 30 is configured to count the marked traveling wave current waveforms, determine similarity between every two traveling wave current waveforms, and judge whether a hidden danger exists in the current line according to the similarity.
The receiving module 10 is further configured to select a plurality of point locations according to the topology structure of the power distribution network line, and install a monitoring device for early warning of hidden troubles of the power distribution network; receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device; and judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
The receiving module 10 is further configured to upload the traveling wave current, the power frequency current, and the power frequency voltage in a preset trigger time period to a background when the variation of the traveling wave current is greater than a preset variation threshold; and judging whether the power frequency current and/or the power frequency voltage have sudden change phenomena or not in the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
The marking module 20 is further configured to mark the current traveling wave current when there is no sudden change of the power frequency current and/or the power frequency voltage.
The judging module 30 is further configured to count traveling wave current waveforms of the marked traveling wave currents within a preset counting time, and determine similarity between every two traveling wave current waveforms; when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line; and when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
The judging module 30 is further configured to count traveling wave current amplitudes at a starting time, an intermediate time, and an ending time of the marked traveling wave current in each period of time within a preset counting time; fitting a current curve in each time period according to the traveling wave current amplitude to obtain a starting time slope, a middle time slope and an ending time slope; and determining a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
The judging module 30 is further configured to generate a corresponding slope matrix according to a preset matrix format according to the starting time slope, the intermediate time slope and the ending time slope; and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
The steps implemented by each functional module of the early warning device for the hidden danger of the distribution network can refer to each embodiment of the early warning method for the hidden danger of the distribution network, and are not described herein again.
In addition, an embodiment of the present invention further provides a storage medium, where a distribution network hidden danger warning program is stored on the storage medium, and when executed by a processor, the distribution network hidden danger warning program implements the following operations:
receiving traveling wave current, power frequency current and power frequency voltage sent by a monitoring device, and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not;
marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon;
and counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and judging whether the current line has hidden danger or not according to the similarity.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
selecting a plurality of point positions according to a power distribution network line topological structure, and installing monitoring devices for early warning of hidden troubles of a distribution network;
receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device;
and judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
when the variation of the traveling wave current is larger than a preset variation threshold, uploading the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period to a background;
and judging whether the power frequency current and/or the power frequency voltage have sudden change phenomena or not by the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
and marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no sudden change phenomenon of sudden increase or sudden decrease.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
counting the traveling wave current waveforms of the marked traveling wave current within preset counting time, and determining the similarity between every two traveling wave current waveforms;
when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line;
and when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
counting the traveling wave current amplitudes of the marked traveling wave current at the starting time, the middle time and the ending time within each period of preset counting time;
fitting a current curve in each time period according to the traveling wave current amplitude to obtain a starting time slope, a middle time slope and an ending time slope;
and determining a corresponding slope matrix according to the initial time slope, the middle time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
Further, when being executed by the processor, the distribution network hidden danger early warning program further realizes the following operations:
generating a corresponding slope matrix according to the initial time slope, the intermediate time slope and the ending time slope and according to a preset matrix format;
and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
According to the scheme, whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon is judged by receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device; marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon; the marked traveling wave current waveforms are counted, the similarity between every two traveling wave current waveforms is determined, and according to the similarity, whether hidden dangers exist in the current line is judged, the insulation hidden dangers existing in the line can be effectively monitored, line patrol personnel are informed of the situation of the hidden dangers in time, the line hidden dangers are prevented from being developed into actual faults at last, the operation reliability of the line is improved, the occurrence rate of line faults is reduced, the high-frequency traveling wave currents of the line can be monitored in real time, accurate identification and early warning of the insulation hidden dangers of the line are achieved, and the speed and the efficiency of early warning of the hidden dangers of a distribution network are improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional like elements in a process, method, article, or apparatus comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A distribution network hidden danger early warning method is characterized by comprising the following steps:
receiving traveling wave current, power frequency current and power frequency voltage sent by a monitoring device, and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon or not;
marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon;
and counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms, and judging whether the current line has hidden danger according to the similarity.
2. The early warning method for the hidden troubles of the distribution network according to claim 1, wherein the step of receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device and judging whether the power frequency current and/or the power frequency voltage have a sudden change phenomenon comprises the following steps:
selecting a plurality of point positions according to a power distribution network line topological structure, and installing monitoring devices for early warning of hidden dangers of a distribution network;
receiving traveling wave current, power frequency current and power frequency voltage of the current line collected by the monitoring device;
and judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon.
3. The early warning method for the hidden danger of the distribution network according to claim 2, wherein the step of judging whether the power frequency current and/or the power frequency voltage has a sudden change phenomenon comprises the following steps:
when the variation of the traveling wave current is larger than a preset variation threshold, uploading the traveling wave current, the power frequency current and the power frequency voltage in a preset trigger time period to a background;
and judging whether the power frequency current and/or the power frequency voltage have sudden change phenomena or not in the background, wherein the sudden change phenomena comprise sudden increase and sudden decrease.
4. The early warning method for the hidden troubles of the distribution network according to claim 1, wherein the marking of the current traveling wave current when the power frequency current and/or the power frequency voltage have no sudden change comprises the following steps:
and marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no sudden change phenomenon of sudden increase or sudden decrease.
5. The early warning method for the hidden dangers of the distribution network, according to the claim 1, is characterized in that the step of counting the waveforms of the marked traveling wave currents, determining the similarity between every two waveforms of the traveling wave currents, and judging whether the hidden dangers exist in the current line according to the similarity comprises the following steps:
counting the traveling wave current waveforms of the marked traveling wave current within preset counting time, and determining the similarity between every two traveling wave current waveforms;
when the similarity is larger than a preset similarity threshold, judging that hidden danger exists in the current line;
and when the similarity is not greater than the preset similarity threshold, judging that no hidden danger exists in the current line.
6. The early warning method for the hidden troubles of the distribution network according to claim 5, wherein the step of counting the traveling wave current waveforms of the marked traveling wave currents within the preset counting time to determine the similarity between every two traveling wave current waveforms comprises the following steps:
counting the traveling wave current amplitudes of the marked traveling wave current at the starting time, the middle time and the ending time within each period of time within preset counting time;
fitting a current curve in each time period according to the traveling wave current amplitude to obtain a starting time slope, a middle time slope and an ending time slope;
and determining a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope, and determining the similarity between every two traveling wave current waveforms according to the slope matrix.
7. The early warning method for the hidden troubles of the distribution network according to claim 6, wherein the step of determining the corresponding slope matrix according to the slope of the starting time, the slope of the intermediate time and the slope of the ending time and the step of determining the similarity between every two traveling wave current waveforms according to the slope matrix comprises the following steps:
generating a corresponding slope matrix according to the initial time slope, the intermediate time slope and the end time slope and a preset matrix format;
and judging the similarity of the slope matrixes between every two traveling wave current waveforms in the same time period by utilizing the KL divergence.
8. The utility model provides a join in marriage net hidden danger early warning device which characterized in that, join in marriage net hidden danger early warning device and include:
the receiving module is used for receiving the traveling wave current, the power frequency current and the power frequency voltage sent by the monitoring device and judging whether the power frequency current and/or the power frequency voltage have mutation phenomena or not;
the marking module is used for marking the current traveling wave current when the power frequency current and/or the power frequency voltage have no mutation phenomenon;
and the judging module is used for counting the marked traveling wave current waveforms, determining the similarity between every two traveling wave current waveforms and judging whether the current line has hidden danger according to the similarity.
9. The utility model provides a join in marriage net hidden danger early warning device which characterized in that, join in marriage net hidden danger early warning device and include: the early warning method comprises a memory, a processor and a distribution network hidden danger early warning program which is stored on the memory and can run on the processor, wherein the distribution network hidden danger early warning program is configured to realize the steps of the early warning method for the hidden danger of the distribution network according to any one of claims 1 to 7.
10. A storage medium, wherein a distribution network hidden danger early warning program is stored on the storage medium, and when being executed by a processor, the storage medium implements the steps of the distribution network hidden danger early warning method according to any one of claims 1 to 7.
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