CN116660688B - Remote power line fault early warning and monitoring system and method - Google Patents
Remote power line fault early warning and monitoring system and method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
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Abstract
The embodiment of the invention provides a remote power line fault early warning and monitoring system and method, and relates to the technical field of power. In the system, each traveling wave monitoring device sends a fault traveling wave signal to the data processing device through the remote communication module. The data processing device determines a plurality of position resolving groups according to the fault occurrence time of the N fault traveling wave signals, determines the fault occurrence position of the target power line according to the two fault occurrence times in each position resolving group to obtain a plurality of fault occurrence positions, determines the ratio of the two voltage information in each position resolving group as a correction amount, corrects the fault occurrence position by the correction amount to obtain a plurality of corrected fault occurrence positions, determines the fault occurrence real-time position of the target power line according to the plurality of corrected fault occurrence positions, and sends early warning information to the power monitoring center. The system can further improve the positioning precision of the fault position.
Description
Technical Field
The invention relates to the technical field of power, in particular to a remote power line fault early warning and monitoring system and method.
Background
With the continuous development of power technology, safe operation of power lines is becoming increasingly important. The failure of the power line can have serious influence on people and also have influence on natural environment. Therefore, monitoring and maintenance of the power lines becomes critical. The power line monitoring means real-time monitoring, early warning and maintenance of the power line. Through the monitoring to the power line, can grasp the running condition of power line in real time to in time discover and reject the trouble (for example, whether the power line takes place trouble such as short circuit, poor contact, thunder, broken string, etc.), thereby ensure the steady operation of electric power system.
The traveling wave measurement technique is a technique for detecting a power line fault. The technology utilizes the propagation characteristic of the traveling wave on the power line, judges whether the power line has faults or not by detecting the change of the traveling wave signal, and calculates the position of the faults. However, the travelling wave measurement technique also has some drawbacks: 1, since the traveling wave signal propagates on the power line is affected by many factors, such as the length, shape, material, etc. of the power line, attenuation and interference of the traveling wave signal are significant. This results in a decrease in the accuracy of the measured fault location; 2, the traveling wave measurement technology is also easily affected by external interference, such as natural interference caused by lightning, or electromagnetic interference caused by human factors, etc., which can cause the quality of traveling wave signals to be reduced, thereby affecting the accuracy of the measured fault position.
Disclosure of Invention
Therefore, the invention aims to provide a remote power line fault early warning monitoring system and a remote power line fault early warning monitoring method, which can further improve the positioning precision of a fault position by correcting the calculated fault position by using voltage information in a fault traveling wave signal and through fault traveling wave signals acquired by distributed traveling wave monitoring equipment so as to accurately position the fault and help timely remove the fault to stabilize the operation of a power system.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
the invention provides a remote power line fault early warning monitoring system, which comprises a data processing device and N traveling wave monitoring devices, wherein the N traveling wave monitoring devices are connected with the data processing device and are distributed on a target power line; each traveling wave monitoring device is used for monitoring a target power line in real time so as to acquire fault traveling wave signals of the target power line when the target power line fails, wherein the fault traveling wave signals comprise fault occurrence time and voltage information corresponding to the fault occurrence time; each traveling wave monitoring device is further used for sending fault traveling wave signals to the data processing device through the remote communication module; the data processing equipment is used for receiving the fault traveling wave signals sent by each traveling wave monitoring equipment to obtain N fault traveling wave signals, and determining a plurality of position resolving groups according to the fault occurrence time of the N fault traveling wave signals; wherein each of the position solution sets includes: two fault occurrence times for calculating a fault occurrence position of the target power line, and two voltage information corresponding to the two fault occurrence times; the data processing device is further used for determining the fault occurrence position of the target power line according to the two fault occurrence times in each position resolving group to obtain a plurality of fault occurrence positions, determining the ratio of the two voltage information in each position resolving group as a correction amount, and correcting the fault occurrence position by using the correction amount to obtain a plurality of corrected fault occurrence positions; the data processing equipment is also used for determining the fault occurrence real-time position of the target power line according to the corrected fault occurrence positions and sending early warning information to the power monitoring center, wherein the early warning information is used for indicating the fault occurrence real-time position of the target power line.
In an alternative embodiment of the present invention, the N traveling wave monitoring devices sequentially include, in order from left to right on the target power line: a 1 st traveling wave monitoring device, a 2 nd traveling wave monitoring device, …, an nth traveling wave monitoring device; the data processing device is used for determining a plurality of position resolving groups according to the fault occurrence time of the N fault traveling wave signals, and comprises the following components: the data processing equipment is used for determining a Kth traveling wave detection equipment and a Kth+1 traveling wave detection equipment according to the fault occurrence time of the N fault traveling wave signals, wherein the fault occurrence time acquired by the Kth traveling wave detection equipment and the Kth+1 traveling wave detection equipment is the earliest two fault occurrence times in the N fault occurrence times; the data processing device is further used for determining the two fault traveling wave signals acquired by the Kth-i traveling wave detection device and the Kth+1+i traveling wave detection device as an i+1 position calculation group so as to obtain a plurality of position calculation groups.
In an alternative embodiment of the present invention, a data processing apparatus for determining a fault occurrence location of a target power line from two fault occurrence times in each of location solution groups to obtain a plurality of fault occurrence locations, includes: a data processing device for calculating a j+1-th relative distance according to a difference between two fault occurrence times in a j+1-th position resolving group among the plurality of position resolving groups and a distance between the K-j traveling wave detecting device and the k+1+j traveling wave detecting device, the j+1-th relative distance representing a distance between the fault occurrence position and the K-j traveling wave detecting device, the difference between the two fault occurrence times being greater than 0; the data processing device is further used for determining the j+1 fault occurrence positions of the target power line according to the j+1 relative distance so as to obtain a plurality of fault occurrence positions.
In an alternative embodiment of the present invention, a data processing apparatus for determining a ratio of two voltage information in each position calculation group as a correction amount includes: and the data processing device is used for determining the ratio of the voltage information acquired by the Kth+1+j traveling wave detection device and the voltage information acquired by the Kth-j traveling wave detection device in the j+1 position resolving group as the j+1 correction amount so as to obtain a plurality of correction amounts.
In an alternative embodiment of the present invention, a data processing apparatus for correcting a failure occurrence position with a correction amount to obtain a plurality of corrected failure occurrence positions, includes: the data processing device is used for correcting the j+1th relative distance by using the following formula to obtain the corrected j+1th relative distance:
wherein ,for the corrected j+1 relative distance, < >>For the j+1 relative distance, +.>Detection equipment for K-j traveling waveDistance from the K+1+j-th traveling wave detection device,/and>for the voltage information collected by the K+1+j traveling wave detection device,/for the voltage information collected by the K+1+j traveling wave detection device>For the voltage information collected by the kth-j traveling wave detection device,/or->A j+1th correction amount; and the data processing equipment is also used for determining the j+1-th corrected fault occurrence position of the target power line according to the corrected j+1-th relative distance so as to obtain a plurality of corrected fault occurrence positions.
In an alternative embodiment of the invention, the fault occurrence real-time location is a central location of the plurality of corrected fault occurrence locations.
In an alternative embodiment of the invention, the voltage information is a positive voltage peak of the fault traveling wave signal or an integrated value of the positive voltage of the fault traveling wave signal with time.
In an alternative embodiment of the present invention, the vertical distances of any adjacent two of the N traveling wave monitoring devices are equal and are the preset distances.
In an alternative embodiment of the present invention, the data processing device is further configured to predict a failure category of the target power line when a failure occurs using the trained neural network model; wherein the training data set of the neural network model comprises: the method comprises the steps of collecting historical fault traveling wave signals of a target power line when faults occur, collecting historical current signals of current sensors arranged on the target power line and corresponding marked fault categories by N traveling wave monitoring devices.
In a second aspect, the invention provides a remote power line fault early warning and monitoring method. The remote power line fault early warning and monitoring method is applied to a remote power line fault early warning and monitoring system, and the remote power line fault early warning and monitoring system comprises a data processing device and N traveling wave monitoring devices, wherein the N traveling wave monitoring devices are connected with the data processing device, and the N traveling wave monitoring devices are distributed on a target power line; the remote power line fault early warning and monitoring method comprises the following steps: each traveling wave monitoring device monitors the target power line in real time so as to acquire fault traveling wave signals of the target power line when faults occur, wherein the fault traveling wave signals comprise fault occurrence time and voltage information corresponding to the fault occurrence time; each traveling wave monitoring device sends a fault traveling wave signal to the data processing device through the remote communication module; the data processing equipment receives the fault traveling wave signals sent by each traveling wave monitoring equipment to obtain N fault traveling wave signals, and a plurality of position resolving groups are determined according to the fault occurrence time of the N fault traveling wave signals; wherein each of the position solution sets includes: two fault occurrence times for calculating a fault occurrence position of the target power line, and two voltage information corresponding to the two fault occurrence times; the data processing equipment determines the fault occurrence position of the target power line according to the two fault occurrence times in each position resolving group to obtain a plurality of fault occurrence positions, determines the ratio of the two voltage information in each position resolving group as a correction amount, and corrects the fault occurrence position by using the correction amount to obtain a plurality of corrected fault occurrence positions; the data processing equipment determines the fault occurrence real-time position of the target power line according to the corrected fault occurrence positions, and sends early warning information to the power monitoring center, wherein the early warning information is used for indicating the fault occurrence real-time position of the target power line.
It can be understood that, based on the embodiments provided in the above aspects, firstly, the fault traveling wave signals collected by the traveling wave monitoring device are sent to the data processing device by using the remote communication module, and the data processing device calculates the fault position, so that the real-time remote power line fault early warning and monitoring can be realized; further, since the fault occurrence position is corrected by determining the ratio of the two pieces of voltage information in each position calculation group as the correction amount, the fault occurrence position information carried in the voltage information can be added to the calculation of the fault position to further correct the fault position, so that the fault position is corrected by the distributed traveling wave detection device and the correction amount calculated by the voltage information, and a large error caused by single detection position data can be avoided, thereby further improving the position accuracy. Therefore, the scheme can realize real-time monitoring and early warning of the fault position of the power line, has a plurality of functions of distributed monitoring, multipoint detection, position resolving, position correcting and the like, can improve the precision and reliability of fault detection, and effectively ensures the safe operation of the power line.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a remote power line fault early warning and monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic waveform diagram of a fault traveling wave signal according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an application scenario of distributed setting of a plurality of traveling wave monitoring devices according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a remote power line fault early warning and monitoring method according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In order to solve the above problems in the prior art: "1", since the traveling wave signal propagates on the power line is affected by many factors, such as the length, shape, material, etc. of the power line, attenuation and interference of the traveling wave signal are remarkable. This results in a decrease in the accuracy of the measured fault location; 2, the traveling wave measurement technology is also easily affected by external interference, such as natural interference caused by lightning, or electromagnetic interference caused by human factors, etc., which can cause the quality of traveling wave signals to be reduced, thereby affecting the accuracy of the measured fault position. The embodiment of the invention provides a technical scheme, which comprises a remote power line fault early warning and monitoring system and a remote power line fault early warning and monitoring method. According to the fault traveling wave signal acquisition method and system, the fault traveling wave signals acquired by the distributed traveling wave monitoring equipment are utilized, the calculated fault occurrence position is corrected by utilizing the voltage information in the fault traveling wave signals, and the positioning accuracy of the fault position can be further improved, so that the fault can be accurately positioned, and timely elimination of the fault is facilitated to stabilize the operation of the power system.
It should be noted that, the technical problems of the prior art solutions described above are all results obtained by the inventor after careful practical study, and therefore, the discovery process of the problems described above and the solutions provided by the embodiments of the present invention below for the problems described above should be all contributions of the inventor to the implementation of the present invention.
The remote power line fault early warning and monitoring system will be described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of a remote power line fault early warning and monitoring system according to an embodiment of the present invention. Wherein, the remote power line fault early warning monitoring system 100 includes: the data processing device 130 and the N traveling wave monitoring devices 120, each of the N traveling wave monitoring devices 120 being connected (e.g., wirelessly communicatively connected) to the data processing device 130, the N traveling wave monitoring devices being distributed on the target power line 110. The wireless communication connection includes 4G, 5G network connection, satellite communication connection, and the like.
In alternative embodiments, the traveling wave monitoring device 120 described above includes a traveling wave sensor and a wireless communication module (e.g., a 4G communication module, a 5G communication module, or a satellite communication module). The data processing device 130 includes a server, desktop or notebook computer, or the like. The data processing device 130 may be disposed in the power monitoring center, or may be disposed in the high-voltage tower shown in fig. 1. The target power line 110 may include high voltage lines that are erected between high voltage towers.
In the system 100 shown in fig. 1, each traveling wave monitoring device 120 is configured to monitor the target power line 110 in real time, so as to collect a fault traveling wave signal of the target power line 110 when a fault occurs, where the fault traveling wave signal includes a fault occurrence time and voltage information corresponding to the fault occurrence time. Each traveling wave monitoring device 120 is also configured to transmit fault traveling wave signals to the data processing device 130 via the telecommunications module. Wherein in an alternative embodiment, the voltage information is a positive voltage peak value of the fault traveling wave signal or an integrated value of the positive voltage of the fault traveling wave signal with time. As shown in fig. 2, fig. 2 is a schematic waveform diagram of a fault traveling wave signal provided by an embodiment of the present invention, where a positive voltage peak value of the fault traveling wave signal may be denoted as Umax, and an integrated value of the positive voltage and time of the fault traveling wave signal may be denoted as a hatched area in the figure.
In the system 100 shown in fig. 1, the data processing device 130 is configured to receive the fault traveling wave signals sent by each traveling wave monitoring device 120 to obtain N fault traveling wave signals, and determine a plurality of position resolution sets according to the fault occurrence times of the N fault traveling wave signals. Wherein each of the position solution sets includes: two failure occurrence times for calculating failure occurrence positions of the target power line 110, and two voltage information corresponding to the two failure occurrence times. The data processing apparatus 130 is further configured to determine a fault occurrence position of the target power line 110 based on two fault occurrence times in each of the position resolution groups to obtain a plurality of fault occurrence positions, determine a ratio of the two voltage information in each of the position resolution groups as a correction amount, and correct the fault occurrence position with the correction amount to obtain a plurality of corrected fault occurrence positions. The data processing device 130 is further configured to determine a fault occurrence real-time position of the target power line 110 according to the plurality of corrected fault occurrence positions, and send early warning information to the power monitoring center, where the early warning information is used to indicate that the target power line 110 has a fault and the fault occurrence real-time position.
Based on the embodiment of the remote power line fault early warning and monitoring system 100, the fault traveling wave signals collected by the traveling wave monitoring device 120 are sent to the data processing device 130 by using the remote communication module, and the data processing device 130 calculates the fault position, so that real-time remote power line fault early warning and monitoring can be realized. Further, since the fault occurrence position is corrected by determining the ratio of the two pieces of voltage information in each position calculation group as the correction amount, the fault occurrence position information carried in the voltage information can be added to the calculation of the fault position to further correct the fault position, so that the fault position is corrected by the distributed traveling wave detection equipment and the correction amount calculated by the voltage information, and a larger error caused by single detection position data can be avoided, thereby further improving the position accuracy. Therefore, the embodiment can realize real-time monitoring and early warning of the fault position of the power line, has multiple functions of distributed monitoring, multipoint detection, position resolving, position correcting and the like, can improve the precision and reliability of fault detection, and effectively ensures the safe operation of the power line.
Having briefly described the remote power line fault pre-warning and monitoring system 100 provided by the embodiments of the present invention, the system 100 will be further described below.
In an alternative embodiment, the N traveling wave monitoring devices 120 sequentially include, in order from left to right on the target power line 110: a 1 st traveling wave monitoring device 120, a 2 nd traveling wave monitoring device 120, …, an nth traveling wave monitoring device 120. In this embodiment, the data processing device 130 is configured to determine a plurality of location solutions according to the fault occurrence times of the N fault traveling wave signals, and specifically includes: the data processing device 130 determines a kth traveling wave detection device and a kth+1 traveling wave detection device according to the fault occurrence times of the N fault traveling wave signals, wherein the fault occurrence times respectively acquired by the kth traveling wave detection device and the kth+1 traveling wave detection device are the earliest two fault occurrence times in the N fault occurrence times; the data processing device 130 also determines two fault traveling wave signals acquired by the kth-i traveling wave detection device and the kth+1+i traveling wave detection device as an ith+1 position solution group to obtain a plurality of position solution groups. Wherein i is an integer increasing from 0, and the maximum value of i is determined by K-i being 1 or more and k+1+i being N or less, that is, i satisfies: k-i is greater than or equal to 1 and K+1+i is greater than or equal to N. This embodiment is described below in connection with one example:
referring to fig. 3, fig. 3 is a schematic diagram of an application scenario of distributed setting of a plurality of traveling wave monitoring devices according to an embodiment of the present invention. In fig. 3, N is assumed to be 6, that is, there are 6 traveling wave monitoring devices 120, which are sequentially denoted as S1, S2, S3, S4, S5, S6 in the order of arrangement from left to right on the target power line 110. And it is assumed that a lightning strike fault occurs on the target power line 110, and that the lightning strike fault occurs between S2 and S3. In this case, the data collected by the 6 traveling wave monitoring devices 120 may refer to table 1, where table 1 is a statistical table of data collected by the traveling wave monitoring devices based on the scenario shown in fig. 3 according to an embodiment of the present invention. Since the lightning strike fault occurs between S2 and S3, the fault occurrence time of the fault traveling wave signals collected by the 6 traveling wave monitoring devices 120 can be determined: the fault occurrence time (T2, T3) acquired by each of S2 and S3 is the earliest two fault occurrence times in the 6 fault occurrence times. Therefore, the Kth traveling wave detection device is S2, the Kth+1st traveling wave detection device is S3, and the 1 st position resolving group comprises fault traveling wave signals acquired by S2 and fault traveling wave signals acquired by S3. By analogy, the 2 nd position solution group includes: and S1, collecting fault traveling wave signals and S4.
TABLE 1
In an alternative embodiment, the data processing device 130 is configured to determine the fault occurrence location of the target power line 110 according to two fault occurrence times in each location calculation group to obtain a plurality of fault occurrence locations, and specifically includes: the data processing device 130 calculates a j+1-th relative distance from the difference between the occurrence times of two faults in the j+1-th position resolving group among the plurality of position resolving groups and the distance between the K-j-th traveling wave detecting device and the k+1+j-th traveling wave detecting device. Wherein, the j+1-th relative distance represents the distance between the fault occurrence position and the Kth traveling wave detection device, the difference value of the two fault occurrence times is larger than 0, j is an integer increasing from 0, and the maximum value of j satisfies: k-j is equal to or greater than 1 and K+1+j is equal to or greater than N (or the maximum value of j is the number of the plurality of position calculation groups-1). This embodiment will be described further below with reference to the examples shown in fig. 3 and table 1: let us describe the calculation of the 1 st relative distance (i.e., j=0) by the 1 st position calculation group: assume that the distance between S2 and S3 isThe difference between T2 and T3 is |T3-T2|, then the 1 st relative distance is calculated according to the following formula:
where V denotes the propagation velocity of the traveling wave in the power line,is the 1 st relative distance.
In an alternative embodiment, the data processing device 130 is further configured to determine a j+1 fault occurrence location of the target power line 110 according to the j+1 relative distance, so as to obtain a plurality of fault occurrence locations. For example, the three-dimensional coordinates of the j+1 th fault occurrence position of the target power line 110 are calculated from the j+1 th relative distance and the coordinates of the K-j th traveling wave detection device.
In an alternative embodiment, the data processing device 130 is configured to determine, as a correction amount, a ratio of two voltage information in each position calculation group, including: the data processing device 130 is configured to determine, as a j+1 correction amount, a ratio of the voltage information acquired by the k+1+j-th traveling wave detection device to the voltage information acquired by the K-j-th traveling wave detection device in the j+1-th position calculation group, so as to obtain a plurality of correction amounts. This embodiment will be described further below with reference to the examples shown in fig. 3 and table 1: for the 1 st position calculating group, the voltage information acquired by the S2 is U2, and the voltage information acquired by the S3 is U3, so that the 1 st correction amount is the ratio of U3 to U2. For the 2 nd position calculating group, the voltage information acquired by the S1 is U1, the voltage information acquired by the S4 is U4, and therefore the 2 nd correction amount is the ratio of U4 to U1.
In an alternative embodiment, the data processing apparatus 130 is configured to correct the fault occurrence location with a correction amount to obtain a plurality of corrected fault occurrence locations, including: the data processing device 130 is configured to correct the j+1th relative distance by using the following formula to obtain the corrected j+1th relative distance:
wherein ,for the corrected j+1 relative distance, < >>For the j+1 relative distance, +.>Is the distance between the Kth-j traveling wave detection device and the Kth+1+j traveling wave detection device,/and/or>For the voltage information collected by the K+1+j traveling wave detection device,/for the voltage information collected by the K+1+j traveling wave detection device>For the voltage information collected by the kth-j traveling wave detection device,/or->The j+1th correction amount. This embodiment will be described further below with reference to the examples shown in fig. 3 and table 1: for example, for the 1 st relative distance after correction(i.e., j=0), +.>。
In an alternative embodiment, the data processing device 130 is further configured to determine a j+1-th corrected fault occurrence location of the target power line 110 according to the corrected j+1-th relative distance, so as to obtain a plurality of corrected fault occurrence locations. For example, the three-dimensional coordinates of the j+1-th corrected fault occurrence position of the target power line 110 are calculated from the corrected j+1-th relative distance and the coordinates of the K-j-th traveling wave detection device.
In an alternative embodiment, the fault occurrence real-time location is a central location of the plurality of corrected fault occurrence locations. The specific calculation method may refer to calculating the center positions of the plurality of coordinate points.
In an alternative embodiment, the vertical distance of any two adjacent traveling wave monitoring devices 120 of the N traveling wave monitoring devices 120 is equal and a preset distance. That is, the traveling wave monitoring devices 120 are distributed on the power line, and the distances between any two adjacent traveling wave detectors in the vertical direction are made equal. It will be appreciated that the target power line 110 is not a straight line, but a vertical line under the influence of gravity. If N traveling wave monitoring devices 120 are distributed on the target power line 110 in a horizontally equidistant manner, it is very easy to cause a situation that a distance calculation error occurs in the setting process; and the N traveling wave monitoring devices 120 are distributed on the target power line 110 in a mode of being vertically and equidistantly arranged, so that the traveling wave monitoring devices 120 can be accurately arranged through the height sensor very conveniently, the installation difficulty is reduced, the installation precision is improved, and the position detection precision is improved.
In an alternative embodiment, the data processing device 130 is further configured to predict a failure category of the target power line 110 upon failure using the trained neural network model. Wherein the training data set of the neural network model comprises: the N traveling wave monitoring devices 120 collect historical fault traveling wave signals of the target power line 110 when a fault occurs, historical current signals collected by current sensors disposed on the target power line 110, and corresponding noted fault categories (e.g., noted fault categories may include lightning strikes, breaks, shorts, etc. of the power line). It can be understood that by adding the voltage information to the training data set of the neural network model for identifying the fault type, the neural network model can learn the information carried in the voltage information, so that the neural network model can learn the data representing the fault more comprehensively to increase the identification precision of the fault type, and the identification precision of the model to the fault type can be improved.
Specifically, the neural network model may include: input layer, convolution layer, pooling layer, full connection layer, and output layer. The training data may include, among other things, time and voltage signals of traveling wave faults collected from different traveling wave sensors, current signals collected by current sensors, and power line fault categories. In the training process, the cross entropy loss function can be used for measuring the classification precision of the model, and the model parameters can be updated by using optimization algorithms such as random gradient descent and the like. The model may be implemented using a deep learning framework. In practical use, the input data needs to be preprocessed, e.g. normalized, etc., to better fit the model. In addition, the diversity and the number of training data can be increased by using data enhancement and other technologies so as to improve the generalization capability and the robustness of the model.
Further, in order to implement the functions of each device in the embodiment of the remote power line fault early warning and monitoring system 100, an implementation manner of the remote power line fault early warning and monitoring method is given below. Referring to fig. 4, fig. 4 is a schematic flow chart of a remote power line fault early warning and monitoring method according to an embodiment of the present invention.
The remote power line fault early warning and monitoring method can be applied to the remote power line fault early warning and monitoring system 100 shown in fig. 1. It should be noted that, the basic principle and the technical effects of the remote power line fault early warning and monitoring method provided in this embodiment are the same as those of the system embodiment described above, and for brevity, reference may be made to corresponding contents in the system embodiment described above where the description of this embodiment is not mentioned.
Specifically, the remote power line fault early warning and monitoring method may include the following steps S410 to S440, which are described below.
S410, each traveling wave monitoring device 120 monitors the target power line 110 in real time to collect a fault traveling wave signal of the target power line 110 when a fault occurs, where the fault traveling wave signal includes a fault occurrence time and voltage information corresponding to the fault occurrence time.
S410, each traveling wave monitoring device 120 transmits a fault traveling wave signal to the data processing device 130 through the telecommunication module.
S410, the data processing device 130 receives the fault traveling wave signals sent by each traveling wave monitoring device 120 to obtain N fault traveling wave signals, and determines a plurality of position resolving groups according to the fault occurrence time of the N fault traveling wave signals; wherein each of the position solution sets includes: two failure occurrence times for calculating failure occurrence positions of the target power line 110, and two voltage information corresponding to the two failure occurrence times.
S410, the data processing apparatus 130 determines the fault occurrence position of the target power line 110 according to the two fault occurrence times in each position calculation group to obtain a plurality of fault occurrence positions, determines the ratio of the two voltage information in each position calculation group as a correction amount, and corrects the fault occurrence position with the correction amount to obtain a plurality of corrected fault occurrence positions.
And S410, the data processing equipment 130 determines the fault occurrence real-time position of the target power line 110 according to the plurality of corrected fault occurrence positions, and sends early warning information to the power monitoring center, wherein the early warning information is used for indicating the fault occurrence of the target power line 110 and the fault occurrence real-time position.
In an alternative embodiment of the present invention, the determining a plurality of position solutions according to the fault occurrence times of the N fault traveling wave signals includes: determining a Kth traveling wave detection device and a Kth+1 traveling wave detection device according to the fault occurrence time of the N fault traveling wave signals, wherein the fault occurrence time acquired by the Kth traveling wave detection device and the Kth+1 traveling wave detection device is the earliest two fault occurrence times in the N fault occurrence times; and determining two fault traveling wave signals acquired by the Kth-i traveling wave detection device and the Kth+1+i traveling wave detection device as an i+1 position resolving group so as to obtain a plurality of position resolving groups.
In an alternative embodiment of the present invention, the determining the fault occurrence location of the target power line 110 according to the two fault occurrence times in each location resolution group to obtain a plurality of fault occurrence locations includes: calculating a j+1-th relative distance according to the difference between two fault occurrence times in a j+1-th position resolving group in the plurality of position resolving groups and the distance between the Kth-j traveling wave detection device and the Kth+1+j traveling wave detection device, wherein the j+1-th relative distance represents the distance between the fault occurrence position and the Kth-j traveling wave detection device, and the difference between the two fault occurrence times is larger than 0; the j+1 th fault occurrence position of the target power line 110 is determined according to the j+1 th relative distance to obtain a plurality of fault occurrence positions.
In an alternative embodiment of the present invention, the determining the ratio of the two voltage information in each position calculation group as the correction amount includes: and determining the ratio of the voltage information acquired by the Kth+1+j traveling wave detection device to the voltage information acquired by the Kth-j traveling wave detection device in the (j+1) th position resolving group as a (j+1) th correction amount so as to obtain a plurality of correction amounts.
In an alternative embodiment of the present invention, the correcting the fault occurrence location with the correction amount to obtain a plurality of corrected fault occurrence locations includes: correcting the j+1-th relative distance by using the following formula to obtain the corrected j+1-th relative distance:
wherein ,for the corrected j+1 relative distance, < >>For the j+1 relative distance, +.>Is the distance between the Kth-j traveling wave detection device and the Kth+1+j traveling wave detection device,/and/or>For the voltage information collected by the K+1+j traveling wave detection device,/for the voltage information collected by the K+1+j traveling wave detection device>For the voltage information collected by the kth-j traveling wave detection device,/or->A j+1th correction amount; determining the j+1-th corrected fault occurrence position of the target power line 110 according to the j+1-th corrected relative distance to obtainTo a plurality of corrected fault occurrence locations.
In an alternative embodiment of the present invention, the method embodiment further includes predicting a fault class of the target power line 110 when the fault occurs using the trained neural network model; wherein the training data set of the neural network model comprises: the N traveling wave monitoring devices 120 collect historical fault traveling wave signals of the target power line 110 when faults occur, historical current signals collected by current sensors arranged on the target power line 110 and corresponding marked fault categories.
Based on the above embodiments, the present invention further provides a computer readable storage medium, where a computer program is stored, and the computer program is executed by a processor to perform the steps of the remote power line fault early warning and monitoring method.
Specifically, the storage medium may be a general-purpose storage medium, such as a mobile magnetic disk, a hard disk, or the like, where the computer program on the storage medium is capable of executing the method in the foregoing embodiment, so as to solve the problem "1", and attenuation and interference of the traveling wave signal are obvious because the traveling wave signal propagates on the power line under the influence of many factors, such as the length, shape, material, and the like of the power line. This results in a decrease in the accuracy of the measured fault location; 2, the traveling wave measurement technology is also easily affected by external interference, such as natural interference caused by lightning, or electromagnetic interference caused by human factors, etc., which can cause the quality of traveling wave signals to be reduced, thereby affecting the accuracy of the measured fault position, etc., by using the fault traveling wave signals collected by the distributed traveling wave monitoring equipment and correcting the calculated fault occurrence position by utilizing the voltage information in the fault traveling wave signals, the positioning accuracy of the fault position can be further improved, so as to accurately position the fault, and help the timely elimination of the fault to stabilize the operation of the power system.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Further, the units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Furthermore, functional modules in various embodiments of the present invention may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present invention and is not intended to limit the scope of the present invention, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The remote power line fault early warning and monitoring system is characterized by comprising a data processing device and N traveling wave monitoring devices, wherein the N traveling wave monitoring devices are connected with the data processing device and are distributed on a target power line; the N traveling wave monitoring devices sequentially comprise, according to the arrangement sequence from left to right on the target power line: a 1 st traveling wave monitoring device, a 2 nd traveling wave monitoring device, …, an nth traveling wave monitoring device; wherein,
each traveling wave monitoring device is used for monitoring the target power line in real time so as to acquire fault traveling wave signals of the target power line when faults occur, wherein the fault traveling wave signals comprise fault occurrence time and voltage information corresponding to the fault occurrence time;
each traveling wave monitoring device is further used for sending the fault traveling wave signal to the data processing device through a remote communication module;
the data processing equipment is used for receiving the fault traveling wave signals sent by each traveling wave monitoring equipment to obtain N fault traveling wave signals; determining a Kth traveling wave detection device and a Kth+1 traveling wave detection device according to the fault occurrence time of the N fault traveling wave signals, wherein the fault occurrence time acquired by each of the Kth traveling wave detection device and the Kth+1 traveling wave detection device is the earliest two fault occurrence times in the N fault occurrence times; determining two fault traveling wave signals acquired by the Kth-i traveling wave detection device and the Kth+1+i traveling wave detection device as an i+1 position resolving group so as to obtain a plurality of position resolving groups; wherein each of the position solution sets includes: two fault occurrence times for calculating a fault occurrence position of the target power line, and two voltage information corresponding to the two fault occurrence times;
the data processing device is further used for calculating a j+1th relative distance according to the difference value of two fault occurrence times in a j+1th position resolving group in the plurality of position resolving groups and the distance between the K-j traveling wave detection device and the K+1th traveling wave detection device, the j+1th relative distance represents the distance between the fault occurrence position and the K-j traveling wave detection device, and the difference value of the two fault occurrence times is larger than 0; determining a j+1 fault occurrence position of the target power line according to the j+1 relative distance to obtain a plurality of fault occurrence positions; determining the ratio of the voltage information acquired by the Kth+1+j traveling wave detection device to the voltage information acquired by the Kth-j traveling wave detection device in the (j+1) -th position resolving group as a (j+1) -th correction amount to obtain a plurality of correction amounts; and correcting the j+1-th relative distance by using the following formula to obtain the corrected j+1-th relative distance:
wherein ,for the (j+1) th relative distance after the correction,>for said j+1 relative distance, < > and->For the distance between the Kth-j traveling wave detection device and the Kth+1+j traveling wave detection device,/o>For the voltage information collected by the K+1+j traveling wave detection device, +.>For the voltage information collected by the K-j traveling wave detection device,for the j+1th correction amount;
the data processing device is further configured to determine a j+1-th corrected fault occurrence position of the target power line according to the corrected j+1-th relative distance, so as to obtain a plurality of corrected fault occurrence positions;
the data processing equipment is further used for determining the fault occurrence real-time position of the target power line according to the corrected fault occurrence positions and sending early warning information to the power monitoring center, wherein the early warning information is used for indicating the fault occurrence of the target power line and the fault occurrence real-time position.
2. The remote power line fault pre-warning monitoring system of claim 1, wherein the fault occurrence real-time location is a central location of the plurality of corrected fault occurrence locations.
3. The remote power line fault pre-warning monitoring system of claim 1, wherein the voltage information is a positive voltage peak of the fault traveling wave signal or an integrated value of the positive voltage of the fault traveling wave signal with time.
4. The remote power line fault pre-warning and monitoring system according to claim 1, wherein the vertical distances of any two adjacent traveling wave monitoring devices in the N traveling wave monitoring devices are equal and are a preset distance.
5. The remote power line fault pre-warning monitoring system of claim 1, wherein the data processing device is further configured to predict a fault category of the target power line when a fault occurs using a trained neural network model; wherein,
the training data set of the neural network model includes: the N traveling wave monitoring devices collect historical fault traveling wave signals of the target power line when faults occur, historical current signals collected by current sensors arranged on the target power line and corresponding marked fault categories.
6. The remote power line fault early warning and monitoring method is characterized by comprising the following steps of:
a fault pre-warning monitoring of a target power line using the remote power line fault pre-warning monitoring system of any one of claims 1-5.
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